Masking (e.g., R, G, B To R, G, B) Patents (Class 348/661)
  • Patent number: 9973662
    Abstract: Particular embodiments detect a solid color frame, such as a black frame, that may include visible content other than the solid color in a portion of the frame. These frames may conventionally not be detected as a solid color frame because of the visible content in the portion of the frame. However, these solid color frames may be “functional” black or white frames, in that the solid color frames are performing the function of the solid color frame even though the frames include the visible content. The visible content may be content that may always be displayed on the screen even if the video content is transitioning to an advertisement. Particular embodiments use techniques to detect the functional solid color frames even when visible content appears in the solid color frames. Particular embodiments use color layout information and edge distribution information to detect solid color frames.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: May 15, 2018
    Assignee: ARRIS Enterprises LLC
    Inventors: Renxiang Li, Faisal Ishtiaq, Alfonso Martinez Smith
  • Patent number: 9098915
    Abstract: An image processing apparatus for adjusting the luminance of a target pixel of an image is provided. The target pixel includes original pixel data and corresponds to a mask value. The image processing apparatus includes a luminance detection unit, a luminance compensation unit and a mapping unit. The luminance detection unit generates an original luminance value according to the original pixel data. The luminance compensation unit adjusts the original luminance value according to a non-linear function to generate a compensated luminance value. The mapping unit generates adjusted pixel data according to the compensated luminance value. The non-linear function at least includes a first monomial function, which has a base part associated with an inverse value of the original luminance value and an exponent part associated with the mask value.
    Type: Grant
    Filed: January 15, 2014
    Date of Patent: August 4, 2015
    Assignee: NOVATEK MICROELECTRONICS CORP.
    Inventors: Yu-Hsing Chuang, Yu-Pin Chang, Chih-Yuan Yang, Feng-Ting Pai
  • Patent number: 8947599
    Abstract: A system that adjusts chroma and luma values for a video signal is presented. During operation, the system receives a matrix of coefficients, which when applied to the chroma values and the luma values of a video signal produces substantially the same result as performing a sequence of discrete operations on the chroma values and the luma values, wherein the sequence of discrete operations includes one or more color-representation-conversion operations and one or more processing amplifier operations. For a given pixel of the video signal, the system performs a matrix-multiplication operation between a matrix representation of the chroma values and the luma values for the given pixel and the matrix of coefficients to produce a modified pixel.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: February 3, 2015
    Assignee: Apple Inc.
    Inventors: Samuel A. Figueroa, Jay D. Zipnick
  • Patent number: 8831285
    Abstract: Detecting an object includes receiving depth data and infrared (IR) data from a depth sensor. A first background subtraction is performed on the IR data to create a first mask, and a second background subtraction is performed on the IR data to create a second mask. The first and second masks and the depth data are merged to create a third mask.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: September 9, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Jinman Kang
  • Patent number: 8817039
    Abstract: Provided is an image processing device which enables image display that takes full advantage of a color reproduction performance of a panel without providing a viewer with a feeling of strangeness. An image processing device includes: a color gamut conversion processor configured to convert inputted data into RGB data according to a liquid crystal panel; a weighting factor calculator configured to calculate a weighting factor; a first post-color-gamut-conversion data weighting processor configured to perform weighting processing to the RGB data; an inputted data weighting processor configured to perform weighting processing to the inputted data; and an output adder configured to add data after the weighting processing to generate RGB data to be supplied to the liquid crystal panel.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: August 26, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Xiaomang Zhang, Akiko Yoshida
  • Patent number: 8797461
    Abstract: A screen time control device includes a source interface for receiving a video signal, a processor connected to the video source interface for overlaying the video signal with a translucent signal to produce an overlaid video signal, and a device interface connected to the processor for receiving the overlaid video signal and providing the overlaid video signal to the display device. The processor substitutes the translucent signal in the overlaid video signal with a parental signal, where the parental signal can be a substantially opaque overlay signal that masks an image on the screen of the display device to prohibit viewing of the screen, a textual message, or a combination of both.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: August 5, 2014
    Assignee: Behavioral Technologies LLC
    Inventors: Steve G. Davis, Jim Vincent, Trever Patton, Kristin Christopherson
  • Patent number: 8760464
    Abstract: Some embodiments provide a program that provides a graphical user interface (GUI). The GUI includes a display area for displaying an image that includes several pixels. The GUI includes a selectable masking tool for displaying in the display area an adjustable closed curve to identify a region in the image to apply a color correction operation. The selectable masking tool includes a selectable control for modifying the adjustable closed curve through a range of elliptical shapes that ranges from a pure ellipse to an approximate rectangle. The GUI includes a selectable GUI item for applying the color correction operation based on the selectable masking tool.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: June 24, 2014
    Assignee: Apple Inc.
    Inventors: Andrew Bryant, Daniel Pettigrew, Olivier Fedkiw
  • Patent number: 8736762
    Abstract: The present disclosure relates to a method and an apparatus for communication between a mobile phone and a TV set. The method comprises the following steps of: generating standard RGB signals by an LCD controller in a central processing unit (CPU) of the mobile phone; transmitting the RGB signals to an LCD of the mobile phone and a TV-OUT chip simultaneously; enabling the TV-OUT chip to receive and recognize the RGB signals through configuration of commands; carrying out video conversion on the RGB signals by the TV-OUT chip to output standard AV signals; and transmitting the AV signals to a display of the TV set via a dock. With this disclosure, information on the LCD screen of the mobile phone can be transmitted to the display of the TV set.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: May 27, 2014
    Assignee: Huizhou TCL Mobile Communication Co., Ltd.
    Inventors: Jun Luo, Xianglai Li, Shuqiang Huang
  • Patent number: 8629884
    Abstract: A wide gamut RGB digital display, such as an LCD display, digital television, printer, or any other suitable display, includes wide color gamut configuration message control logic that is operative to indicate, to an image source provider, wide gamut RGB indication information and wide color gamut format definition information that indicates that wide gamut RGB color data is to be received by the wide gamut RGB digital display. The wide gamut configuration message control logic is also operatively responsive to wide gamut confirmation information that is received from the image source provider. The wide gamut RGB digital display also includes logic that is operative to display received wide gamut RGB color data that was received in response to the wide gamut RGB indication information and the wide color gamut format definition information.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: January 14, 2014
    Assignee: ATI Technologies ULC
    Inventor: David I. J. Glen
  • Patent number: 8411206
    Abstract: In one embodiment, an image decoding system for a YCbCr formatted signal includes a color space converter capable of representing an RGB image signal with one or two negative image signal components. The image decoding system further includes a degamma correction unit and an image signal formatter. An offset of the image black level from zero corresponding to the image signal offset produced by the color space converter is employed to perform degamma correction. In a further embodiment, gain, offset, and sign are removed from the image signal produced by the color space converter prior to degamma correction. The image signal formatter may utilize a one-dimensional and a three-dimensional lookup table to produce an image signal that may include secondary and white image components. The system advantageously accommodates decoding xvYCC-encoded image data in conventional as well as new hardware display system architectures.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: April 2, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Gregory S. Pettitt, Rajeev Ramanath
  • Patent number: 8358338
    Abstract: An image data processing includes: obtaining first image data; outputting the first image data to the image display devices; obtaining an attention area composed of one or more arbitrarily specified pixels from the first image outputted to the image display devices ; displaying a color chart whose hue and chroma are gradually changed toward around the color corresponding to the image data of the attention area; obtaining arbitrarily selected color information from the displayed color chart; obtaining a plurality of combinations of the attention area and the color information corresponding to the attention area and calculating a color parameter on the basis of the obtained plurality of combinations; converting the color of the obtained image data on the basis of the color parameter; and outputting the image data whose color is converted, to the image display devices as a second image.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: January 22, 2013
    Assignee: Olympus Corporation
    Inventor: Shinichiro Aizaki
  • Patent number: 8233038
    Abstract: An image-signal processing unit comprising a first and second luminance calculation block, a correction-value calculation block, and a subtraction block, is provided. The first luminance calculation block calculates a first luminance corresponding to the sum of a plurality of primary color light components. Each of them is multiplied by a coefficient from a first coefficient combination. The second luminance calculation block calculates a second luminance corresponding to the sum of a plurality of the primary color light components. Each of them is multiplied by a coefficient from a second coefficient combination. The correction-value calculation block calculates a luminance correction value according to the second luminance if the first luminance is greater than a threshold value. The subtraction block calculates a corrected luminance by subtracting the luminance correction value from the first luminance.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: July 31, 2012
    Assignee: Hoya Corporation
    Inventors: Kohei Iketani, Go Matsui
  • Patent number: 7903178
    Abstract: A color management unit is architected to achieve higher-quality appearance used in various video formats and to enable improvements in picture contrast and colorfulness. The color management unit comprises an optional input color space converter to convert the input digital video to a desired color space, an adaptive contrast enhancer to apply contrast improvement algorithms in response to different scenes in either manual or automatic modes, intelligent color remapping for enhancing selected colors, sRGB compliance to produce a video display that is uniform over different monitors, global color and brightness controls to combine global processing and color conversion, gamut compression to maintain pixel validity in color space conversion, and gamma correction to compensate for nonlinear characteristics of an output display.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: March 8, 2011
    Assignee: Marvell International Ltd.
    Inventors: Nikhil Balram, Sujith Srinivasan, Bipasha Ghosh, Sanjay Garg
  • Patent number: 7746411
    Abstract: A color management unit is architected to achieve higher-quality appearance used in various video formats and to enable improvements in picture contrast and colorfulness. The color management unit comprises an optional input color space converter to convert the input digital video to a desired color space, an adaptive contrast enhancer to apply contrast improvement algorithms in response to different scenes in either manual or automatic modes, intelligent color remapping for enhancing selected colors, sRGB compliance to produce a video display that is uniform over different monitors, global color and brightness controls to combine global processing and color conversion, gamut compression to maintain pixel validity in color space conversion, and gamma correction to compensate for nonlinear characteristics of an output display.
    Type: Grant
    Filed: December 7, 2005
    Date of Patent: June 29, 2010
    Assignee: Marvell International Ltd.
    Inventors: Nikhil Balram, Sujith Srinivasan, Bipasha Ghosh, Sanjay Garg
  • Publication number: 20100079481
    Abstract: A method and system marks a scene and images acquired of the scene with tags. A set of tags is projected into a scene while modulating an intensity of each tag according to a unique temporally varying code. Each tag is projected as an infrared signal at a known location in the scene. Sequences of infrared and color images are acquired of the scene while performing the projecting and the modulating. A subset of the tags is detected in the sequence of infrared images. Then, the sequence of color image is displayed while marking a location of each detected tag in the displayed sequence of color images, in which the marked location of the detected tag corresponds to the known location of the tag in the scene.
    Type: Application
    Filed: January 21, 2008
    Publication date: April 1, 2010
    Inventors: Li Zhang, Neesha Subramaniam, Robert Lin, Shree K. Nayar, Ramesh Raskar
  • Patent number: 7583318
    Abstract: An apparatus for converting input image signals into image signals that can be displayed in an image display device. The image display device includes a color space converter converting color components of the input image signals and color components that can be displayed in the image display device into color space, a hue control variable calculator comparing a converted color gamut with each other to calculate a hue control variable, and a hue controller controlling hues of the input image signals using the hue control variable.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: September 1, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyun-wook Ok, Seong-deok Lee, Chang-yeong Kim
  • Patent number: 7511724
    Abstract: A control of gobos defend by records in the gobo. The gobos are formed by menued shapes.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: March 31, 2009
    Assignee: Production Resource Group, LLC
    Inventor: Mark A. Hunt
  • Patent number: 7394470
    Abstract: In a method for reversibly transforming a data format, a forward transformation and a backward transformation are reciprocally conducted for data between unit systems having different resolution levels, and the forward transformation and the backward transformation, a first unit system having a lower resolution level is used as a common unit system, and a reversible data conversion is conducted by an integer operation for data in the first unit system having the lower resolution level and data in a second unit system having a higher resolution level higher than the first unit system.
    Type: Grant
    Filed: January 22, 2004
    Date of Patent: July 1, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Takayuki Nishimura, Yasuyuki Nomizu, Hiroyuki Sakuyama, Junichi Hara, Nekka Matsuura, Takanori Yano, Taku Kodama, Toshio Miyazawa, Yasuyuki Shinkai
  • Patent number: 7053959
    Abstract: A mask circuit masks a digital video signal so that a video signal of an analog video signal is not outputted for a predetermined period after the start of output of a horizontal synchronizing signal of the analog video signal. A period of masking the digital video signal by the mask circuit is set in a control register, and the control register transmits the masking period to the mask circuit. A digital video signal to analog video signal converting unit converts the digital video signal masked and outputted from the mask circuit into an analog video signal. Thus, by setting in the control register the period of masking the digital video signal until the video signal of the analog video signal is stabilized, a digital video encoder can output a stable video signal.
    Type: Grant
    Filed: April 4, 2003
    Date of Patent: May 30, 2006
    Assignee: Sony Corporation
    Inventor: Naoki Hosoi
  • Patent number: 7034894
    Abstract: A multiple-format video encoder stores values of the sine and cosine functions in a ROM. According to the externally specified video format, an address calculating circuit calculates the addresses at which to access the ROM. In the multiple-format video encoder, a luminance/color-difference signal generating circuit generates color-difference signals B-Y and R-Y from digital RGB signals. A first multiplying circuit multiplies the color-difference signal B-Y by the values of the sine function stored in the ROM at the addresses specified by the address calculating circuit and multiplies the color-difference signal R-Y by the values of the cosine function stored at the same addresses.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: April 25, 2006
    Assignee: Rohm Co., Ltd.
    Inventor: Yasunori Kawamura
  • Patent number: 6961066
    Abstract: A method is provided for automatically adjusting the color of a digital image. In one aspect, an strength offset is determined to automatically remove gray from a distorted image. In an other aspect applied independently or after gray removal, scaling factors are automatically determined to adjust the image to conform to empirically determined optimal brightening of the image. Using a determination of color dot maximums and a function which ensures constraint within the dynamic range, scaling factors are established which correspond to the strength values of each dot maximum and which are applied to each of the dot's R,G and B to maintain ratios therebetween and thus maintain the true color. The function for establishing the scaling factors is interpolated from a nominal function and a target average strength for the image.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: November 1, 2005
    Assignee: Athentech Technologies, Inc.
    Inventor: Brian G. James
  • Patent number: 6804356
    Abstract: A method and system for creating authentication signatures for digital images and video frames is provided. The method and system involves partitioning the image into multiple blocks, comparing characteristics from each block and generating data bits based on the comparison. Each block is then broken up into additional blocks and those blocks are compared to create additional signature bits which are combined with the signature sets from the first set of blocks. Each of these new smaller blocks can be further broken up and the procedure can be repeated to provide an authentication signature of desired length.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: October 12, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Santhana Krishnamachari
  • Publication number: 20040105032
    Abstract: A method of and an apparatus for enhancing digital image quality. Input color data are transformed to obtain brightness data and chrominance data. The transformed brightness data is compared with predetermined brightness levels X1 and X2 on a pixel by pixel basis and the brightness data of each concerned pixel is reset or output without change according to the comparison. The comparison identifies the concerned pixel as belonging to one of a dark area and a light area requiring contrast enhancement and the brightness level of the concerned pixel is adjusted to provide the enhanced contrast. The obtained chrominance data and the reset brightness data are inversely transformed into corresponding color data. The predetermined brightness levels X1 and X2 are adaptively recomputed after a last pixel in a concerned line is considered for contrast enhancement.
    Type: Application
    Filed: September 3, 2003
    Publication date: June 3, 2004
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Kyeong-man Kim, Goo-soo Gahang
  • Publication number: 20040027491
    Abstract: A mask circuit masks a digital video signal so that a video signal of an analog video signal is not outputted for a predetermined period after a start of output of a horizontal synchronizing signal of the analog video signal. A period of masking the digital video signal by the mask circuit is set in a control register, and the control register transmits the masking period to the mask circuit. A digital video signal to analog video signal converting unit converts the digital video signal masked and outputted from the mask circuit into an analog video signal. Thus, by setting in the control register the period of masking the digital video signal until the video signal of the analog video signal is stabilized, a digital video encoder can output a stable video signal.
    Type: Application
    Filed: April 4, 2003
    Publication date: February 12, 2004
    Inventor: Naoki Hosoi
  • Patent number: 6674465
    Abstract: An apparatus for processing image data including three complementary color components representing the three primary colors includes a distribution circuit for distributing the image data into first to third complementary color components. A multiplication circuit generates first to third products by multiplying the first and second complementary color components, the first and third complementary color components, and the second and third complementary color components. A square root circuit then calculates the square root of each of the three products. The calculated square roots represent the three primary colors.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: January 6, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Toshio Nakakuki
  • Patent number: 6614488
    Abstract: A method and apparatus for controlling tint in a digital color display system capable of efficiently performing tint control of displayed colors. The tint control method is executed according to the following: (1) when the maximum and the minimum among R, G, B are the maximum gray scale value and the minimum gray scale value respectively, a step of transforming the input color into a color of a different tint based on a use defined maximum transformation value and a transformation direction; (2) when the maximum and the minimum among R, G, B are Dmax and Dmin respectively, a step of transforming the input color into a color of a different tint based on a smaller transformation value and the same transformation direction; and (3) when all values R, G, B are equal, a step of not transforming the input color in accordance with any input set value.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: September 2, 2003
    Assignee: International Business Machines Corporation
    Inventors: Kazushi Yamauchi, Masayuki Sohda
  • Patent number: 6552751
    Abstract: A video signal processing circuit for making adjustments of a brightness, a contrast, a hue, and the like of a color video signal by a simple circuit construction. Input video signals which are supplied as 3-primary color signals or luminance and color difference signals are converted to the luminance and color difference signals or the 3-primary color signals and processed to effect adjustments of a picture displaying form, and the adjusted signals are inversely converted subsequently.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: April 22, 2003
    Assignee: Pioneer Corporation
    Inventor: Tetsuya Shigeta
  • Patent number: 6486923
    Abstract: A color picture display apparatus employs an array of light-emitting diodes or other light-emitting elements emitting different colors. A television signal is converted to monochromatic signals of the different colors. A color converter modifies the monochromatic signals, thereby changing the displayed hues to match the hues that would be displayed on a television screen, to compensate for ambient lighting conditions, or to achieve other desired effects. If each picture element has only a single light-emitting element, the modification preferably avoids unlit gaps in monochromatic areas of the displayed picture.
    Type: Grant
    Filed: January 4, 2000
    Date of Patent: November 26, 2002
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuya Maeshima, Zenichiro Hara, Takashi Okamoto, Shinya Iio
  • Patent number: 6363526
    Abstract: An objectionable outlining effect, seen as dark edges and white edges outlining everything in a scene, is eliminated by clipping or limiting the spikes generated by excessive enhancement. Specifically, a method is used for improving the quality of an enhanced video image, while simultaneously maintaining or improving image sharpness, by clipping the RGB levels of the enhanced video image, at the points of enhancement, to upper and lower level bounds representing the signal levels of the video signal prior to its enhancement.
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: March 26, 2002
    Assignee: Ultimatte Corporation
    Inventors: Paul Vlahos, Arie Berman, Arpag Dadourian
  • Patent number: 6297855
    Abstract: A simplified Y/C separation circuit in which, a plurality of luminance signals are calculated for the subject pixel based on an NTSC signal of the subject pixel and NTSC signals of pixels that are close to the subject pixel spatially or temporally. Correlations between the plurality of luminance signals are obtained in a difference circuit and a comparison circuit. In a classification circuit, classification is performed, that is, the subject pixel is classified as belonging to a certain class, based on the correlations between the plurality of luminance signals. Prediction coefficients corresponding to the class of the subject pixel are read out from a prediction coefficients memory section. The RGB luminance signals of the subject pixel are then determined by calculating prescribed linear first-order formulae.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: October 2, 2001
    Assignee: Sony Corporation
    Inventors: Tetsujiro Kondo, Naoki Kobayashi, Hideo Nakaya, Takaya Hoshino, Takeharu Nishikata
  • Patent number: 6275606
    Abstract: A method and system for matching color displayed by source and destination display devices and particularly for providing color matching between a computer monitor and an ink printer. The technique of the present invention initially determines the combination and color value ratios of single destination color components that will cause the destination device to display a color that essentially matches each of fully saturated single and dual colors of a source display device. These combinations of single destination color components and their corresponding color value ratios determine the best available blends of destination device color components for printing source device colors. A color matching algorithm is employed to derive the color value ratios—one for each of the single destination color components.
    Type: Grant
    Filed: January 27, 2000
    Date of Patent: August 14, 2001
    Assignee: Apple Computer, Inc.
    Inventor: Robin D. Myers
  • Patent number: 6243083
    Abstract: To obtain a clear-cut picture image by correcting a contour of a video signal of a natural picture image and the like from a computer. Video signals of, for example, three primary colors (R, G, B), including a natural picture image and the like produced by, for example, a computer from input terminals 1 are supplied to a mixing circuit (2) and mixed at a ratio of, for example, 0.6G+0.3R+0.1B to produce a signal corresponding to a luminance (Y). This signal is supplied to differentiation circuits 3A and 3B having different time constants each other and predetermined high frequency components are extracted therefrom, respectively, and these output signals are selected by a switch (4), and then supplied to an amplifying circuit 5. The gain of the amplifying circuit 5 is arbitrarily controlled by a signal from a control terminal (6).
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: June 5, 2001
    Assignee: Sony Corporation
    Inventors: Akira Arimizu, Shozo Mitarai, Toshiaki Inoue
  • Patent number: 6229580
    Abstract: The invention provides an image color correction apparatus by which a hue in a desired region in a color image can be corrected to a desired hue readily. Based on a hue and a hue range designated, a color approximation degree hx of each of noticed pixels of input pixels of an input signal is calculated, where HSV values are represented by (h1, s1, v1), in accordance with hx=((m−|Hue−h1|)/m)×s1×v1, and where correction coefficients of color signals R, G and B of each of the input pixels are represented by (a1, a2, a3), the color signals (R, G, B) are corrected to (R′, G′, B′) so that the corrected color signals (R′, G′, B′) may satisfy (R′, G′, B′)=(R, G, B)+hx×(a1, a2, a3).
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: May 8, 2001
    Assignee: NEC Corporation
    Inventor: Akira Inoue
  • Patent number: 6172714
    Abstract: A method of providing conversion from YUV signals to RGB signals includes the steps of determining a correspondence value between each of the Y. U, and V pixel values and the corresponding one of the R, G, and B pixel values. Three tables are generated; a Y table, a U table and a V table. During operation, each table may then be easily accessed by indexing the table with the respective Y, U or V input, to provide R,G,B data. The method may be used in a 64 bit embodiment using two registers or one register. Alternatively, the method may be used in a 32 bit embodiment. The conversion method can easily be augmented to provide color adjustment during conversion without any added complexity.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: January 9, 2001
    Assignee: Compaq Computer Corporation
    Inventor: Robert A. Ulichney
  • Patent number: 6141064
    Abstract: A luminance signal generation circuit with single clamp generates a separate luminance signal Y by combining RGB input signals in a weighted manner within a Y-Matrix circuit. During a burst period the single clamping circuit is enabled. When enabled, the single clamping circuit compares the separate luminance signal Y to a constant reference voltage signal. A difference signal, representing the difference between the separate luminance signal Y and the constant reference voltage signal, is used to adjust a blanking level of the RGB input signals until the blanking level of the separate luminance signal Y is equal to the constant reference voltage signal. During the non-burst periods the single clamping circuit is disabled and the Y-Matrix circuit combines the RGB input signals into the separate luminance signal Y. Preferably, the single clamping circuit sets the blank level of the separate luminance signal Y to a level equal to two volts.
    Type: Grant
    Filed: May 8, 1997
    Date of Patent: October 31, 2000
    Assignees: Sony Corporation, Sony Electronics, Inc.
    Inventors: Mehrdad Nayebi, Duc Ngo
  • Patent number: 6140997
    Abstract: A color feature extracting apparatus is provided, which can easily transform a RGB color space into a color space close to the human sense and execute color classification and color region distinction of a digital image in the transformed color space. RGB values of each pixel of a digital image are transformed into HLS values by a color space transforming section. A hue value and a luminosity value of the HLS values are corrected by a hue correcting section and a luminosity correcting section, respectively, so that a region between a green color and a yellow color in a direction of hue and a region between the green color and a light blue color in the direction of hue are narrowed and a region between a red color and the yellow color in the direction of hue is widened in a color space represented by the HLS values. Then, the color features of the digital image are extracted by a color feature extracting section on the basis of the corrected hue value and luminosity value.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: October 31, 2000
    Assignee: Minolta Co., Ltd.
    Inventor: Sumiyo Tanaka
  • Patent number: 6075573
    Abstract: In a method and apparatus for converting digitized luminance-chrominance color space signals to digitized RGB color space signals, starting chrominance-in-color terms of a standard set of conversion equations are expanded into linear combinations of expanded chrominance-in-color terms that involve only predictive and compensative coefficients. Predictive and compensative code generators respectively generate predictive and compensative transformation codes that correspond to a first one of the chrominance color space signals during a first timing phase and that correspond to a second one of the chrominance color space signals during a second timing phase. The predictive and compensative transformation codes from the predictive and compensative code generators are transformation values for the expanded chrominance-in-color terms and are linearly combined to obtain transformation values for the starting chrominance-in-color terms.
    Type: Grant
    Filed: January 14, 1998
    Date of Patent: June 13, 2000
    Assignee: Winbond Electronics Corp.
    Inventor: Rong-Fuh Shyu
  • Patent number: 6072902
    Abstract: A method and system for matching color displayed by source and destination display devices and particularly for providing color matching between a computer monitor and an ink printer. The technique of the present invention initially determines the combination and color value ratios of single destination color components that will cause the destination device to display a color that essentially matches each of fully saturated single and dual colors of a source display device. These combinations of single destination color components and their corresponding color value ratios determine the best available blends of destination device color components for printing source device colors. A color matching algorithm is employed to derive the color value ratios--one for each of the single destination color components.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: June 6, 2000
    Assignee: Apple Computer, Inc.
    Inventor: Robin D. Myers
  • Patent number: 6025885
    Abstract: In a process for color transformation from the input-side primaries (R, G, B) to image-side primaries (R", G", B") with a greater color stimulus specification region than that given by the input-side primaries (R, G, B), a color transformation is carried out by converting the components of a color vector from the input-side primaries to fictitious primaries (R', G', B') so that the color stimulus specification of the color vector is changed, and transforming of the converted components of the color vector from the fictitious primaries (R', G', B') to the image-side primaries (R", G", B") for generating image-side components of the color vector, wherein the image-side color stimulus specifications produced in this way have the same hue and the same saturation as the transformed color stimulus specification in the fictitious primary system (R', G', B').
    Type: Grant
    Filed: October 3, 1996
    Date of Patent: February 15, 2000
    Assignee: LDT-GmbH & Co. Laser-Display-Technologie KG
    Inventor: Christhard Deter
  • Patent number: 6016168
    Abstract: A color correction device, for strengthening or weakening a specific color according to the selection of a user, is provided. In a color correction device, the area of an input color signal is determined according to chrominance axes, coefficients of a corresponding coordinate of the chrominance axes are read from a storage memory, and a matrix operation is performed on the input color signal before it is output. An index table divides the area defined by chrominance axes on the basis of r, g, and b signals. A storage memory contains coefficients corresponding to the respective coordinate positions for correcting the color signal to represent colors similarly to the original color of the subject. A specific color may be strengthened or weakened based on the selection of a user, due to the addition of a second storage memory which contains, coefficient tables for designating areas according to the chrominance axes corresponding to a color to be strengthened or weakened.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: January 18, 2000
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jin-gu Kim
  • Patent number: 5999164
    Abstract: Conversion of YUV-format data into RGB-format data is consecutively carried out through pipeline processing in two stages, namely, primary and secondary conversion which are derived from only the common expressions of theoretical conversion equations. The secondary conversion is executed by a circuit subsequent to ROMs 51a to 51c. Of the secondary conversion operation, the conversion of a G component requires complicated calculation. Therefore, analogous calculation is carried out to convert the G component.
    Type: Grant
    Filed: February 16, 1997
    Date of Patent: December 7, 1999
    Assignee: Yamaha Corporation
    Inventor: Shuhei Ito
  • Patent number: 5995165
    Abstract: In a color correction apparatus for a color display device using 2-dimensional (2-D) chromaticity partitioning, a chromaticity plane is unevenly partitioned such that partitioned areas adjacent to each vertex of the chromaticity plane have larger areas. An area determining unit projects an input 3-D color signal onto the 2-D chromaticity plane, and outputs an index representing the location of the input color signal in the 2-D chromaticity plane. A first memory stores index values of the unevenly partitioned areas of the chromaticity plane, and outputs an index value corresponding to the index. A second memory stores transform coefficients of a matrix defining an input-output relationship of the color signal and outputs a predetermined number of transform coefficients stored in an address designated by the index value output by the first memory.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: November 30, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Chae-gon Oh
  • Patent number: 5963263
    Abstract: In a method and apparatus for converting digitized luminance-chrominance color space signals to digitized RGB color space signals, a first combining unit generates a plurality of predetermined linear combinations of the chrominance color space signals received by a multiplexed multiplication unit which includes no more than two look-up tables that contain digitized transformation values for performing matrix multiplications of the linear combinations of the chrominance color space signals. A second combining unit linearly combines the digitized transformation values outputted by the multiplexed multiplication unit and a predetermined binary combination of the luminance color space signal in a first predetermined manner to generate three RGB color combination signals. A third combining unit linearly combines the RGB color combination signals in a second predetermined manner to obtain the RGB color space signals.
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: October 5, 1999
    Assignee: Winbond Electronic Corp.
    Inventor: Rong-Fuh Shyu
  • Patent number: 5920358
    Abstract: Physiological primary colors, which correspond to tristimulus values of each of picture elements of an image on a hard copy, are obtained. A parameter, which represents the degree of incomplete chromatic adaptation, is determined in accordance with a correlated color temperature of a white point of a CRT display device, on which the image is to be displayed. Temporary tristimulus values, which are to be reproduced on the CRT display device, are derived in accordance with the parameter. From the temporary tristimulus values, perception values relating to lightness, color vividness and hue, such as metric lightness, metric chroma, and a metric hue angle in the LAB-color space are calculated by taking the white point of the CRT display device as a viewing illuminance. The tristimulus values of the image are then transformed into the tristimulus values on the display device, and a soft copy image is formed on the display device in accordance with the transformed tristimulus values.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: July 6, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Kazuhiko Takemura
  • Patent number: 5726682
    Abstract: The present invention relates to a method of converting signal components of one of a first input three component color model signal and a second input three component color model signal to either one of the first or second three component color model comprised of matrix multiplying input signal components with an array of predetermined transformation parameters to form a multiplied set, vector adding the multiplied set with a predetermined group of offset vectors, whereby signal components of the output signal are produced.
    Type: Grant
    Filed: March 7, 1996
    Date of Patent: March 10, 1998
    Assignee: ATI Technologies Inc.
    Inventors: Sanford S. Lum, Keping Chen
  • Patent number: 5719639
    Abstract: A subject color and a non-subject color of color change operation are specified and then a first color vector representing the subject color and a second color vector representing the non-subject color are obtained. A substitute color for replacing a component of the subject color is further specified, and a color vector representing the substitute color is obtained. A third color vector independent of the first and second color vectors is further determined. A color of each pixel in an original color image is expressed by linear combination of the first through third color vectors, thereby obtaining first through third coefficients for the first through the third color vectors. If the first coefficient is positive, the first color vector is replaced by the substitute color vector. The pixel color after the color change operation is then determined by producing a composite vector using the first through the third coefficients.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: February 17, 1998
    Assignee: Dainippon Screen Mfg., Ltd.
    Inventor: Atsushi Imamura
  • Patent number: 5691779
    Abstract: The present invention provides color conversion apparatus that prevents overflow in color reproduction, changes in hue, and the deterioration of gradation to improve image quality. The present color conversion apparatus inputs to itself luminance and color difference signals, sets a reference value not less than the maximum level of the luminance signal, converts the luminance and color difference signals into primary color signals, detects the maximum value of the primary color signals for each pixel, lowers the levels of the color difference signals if the maximum value is over the reference value to locate the amplitude of the primary color signals not greater than the reference value.
    Type: Grant
    Filed: December 13, 1996
    Date of Patent: November 25, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Haruo Yamashita, Tsumoru Fukushima
  • Patent number: 5619280
    Abstract: The present invention provides color conversion apparatus that prevents overflow in color reproduction, changes in hue, and the deterioration of gradation to improve image quality. The present color conversion apparatus inputs to itself luminance and color difference signals, sets a reference value not less than the maximum level of the luminance signal, converts the luminance and color difference signals into primary color signals, detects the maximum value of the primary color signals for each pixel, lowers the levels of the color difference signals if the maximum value is over the reference value to locate the amplitude of the primary color signals not greater than the reference value.
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: April 8, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Haruo Yamashita, Tsumoru Fukushima
  • Patent number: 5537563
    Abstract: A processing system operates on data words each having first and second portions. A first memory stores the first portion of a first data word accessible by a first set of address bits received at first address inputs and a second set of address bits received at second address inputs, and stores the second portion of a second word accessible by the first set of address bits received at the first address inputs and a third set of address bits received at the second address inputs. A second memory stores the first portion of the second data word accessible by a first set of address bits received at first address inputs and a second set of bits received at second address input, and stores the second portion of the first word accessible by the first set of address bits received at the first address inputs and a third set of address bits received at the second address inputs. A first access mode accesses a selected one of the first and second portions of both the first and second words.
    Type: Grant
    Filed: February 16, 1993
    Date of Patent: July 16, 1996
    Assignee: Texas Instruments Incorporated
    Inventors: Karl M. Guttag, Robert J. Gove, Richard Simpson
  • Patent number: 5390034
    Abstract: Color image processing method and apparatus for suppressing side effects of a chrominance emphasizing process are provided. A chrominance C of an original color image is detected by a chrominance detector. A luminousness V of the original color image is detected by a luminousness detector. A parameter selector selects chrominance conversion parameters on the basis of the chrominance C and luminousness V to generate a selected parameter. A chrominance converter executes the chrominance conversion by chrominance conversion parameters a to i. It is possible to suppress a side effect such that the color deviation becomes conspicuous in a portion of small chrominance and luminousness due to the execution of the chrominance emphasizing process. Thus, image data of a high quality can be obtained.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: February 14, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuya Murakami, Eiichi Hadano, Kazuyuki Kodama, Kazunori Kinoshita, Masaaki Fujinawa, Hiromichi Fujisawa