Digital Patents (Class 348/646)
  • Patent number: 9680496
    Abstract: Described is an apparatus which comprises: a first integrator to receive an input signal and to generate a first output; a second integrator to receive the first output or a version of the first output and to generate a second output; and an analog-to-digital converter (ADC) to quantize the second output into a digital representation, the ADC including a detection circuit to detect an overload condition in the second output.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: June 13, 2017
    Assignee: Intel Corporation
    Inventors: John G. Kauffman, Krzysztof Dufrene
  • Patent number: 9411146
    Abstract: An observation device is provided with a light source section, a detection section and an arithmetic operation section. The light source section emits light to a moving object from multiple directions. a detection section is disposed on a predetermined plane such that scattered light having an identical scattering angle enters at an identical position, outputs data temporally changing at a frequency corresponding to an amount of Doppler shift of light that reaches at each position on the predetermined plane. An arithmetic operation section performs a one-dimensional Fourier transform with respect to time variables, for data having a position in the first direction on the predetermined plane, a position in the second direction on the predetermined plane, and a time as variables, and extracts data having an identical incident angle relative to the object from the Fourier-transformed data, on the basis of Doppler Effect.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: August 9, 2016
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventor: Hidenao Iwai
  • Patent number: 9288461
    Abstract: An apparatus and a method for processing an image. The method includes: increasing contrast of an input image to generate a first image; adding a mask having a pattern showing an image effect, to the first image to generate a second image; and adjusting a range of pixel values of the second image to generate a resultant image.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: March 15, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Eun-sun Ahn, Jin-pyo Gwak
  • Patent number: 9196198
    Abstract: This disclosure provides systems, methods, non-transitory computer readable storage media, and apparatus for displaying images using hue-based frame-specific contributing colors (FSCCs). In one aspect, an input is configured to receive image data corresponding to a current image frame. Contributing color selection logic is configured, based on received image data, to obtain a set of FSCCs for use in conjunction with a set of frame-independent contributing colors (FICCs) to generate the current or a subsequent image frame on a display. The set of FSCCs are obtained from determining the dominant hues in the image frame. The image frame is displayed such that subframes associated with displaying the FSCCs have weights that are greater than the subframes associated with displaying the FICCs.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: November 24, 2015
    Assignee: Pixtronix, Inc.
    Inventors: Edward Buckley, Fahri Yaras
  • Patent number: 8953013
    Abstract: This invention discloses an image pickup device and an image synthesis method thereof The image pickup device comprises an image-pickup module, an image-synthesis module, a database and a processing module. The image-pickup module captures a plurality of temporary images of a scene. The image-synthesis module extracts a part of each temporary image and combines the parts to form a panorama temporary image, and splits the panorama temporary image into a plurality of zone-areas according to at least one threshold value and a panorama luminosity histogram. The database stores a lookup table for recording a plurality of exposure values. The plurality of the exposure values correspond to luminance values of the zone-areas respectively. The processing module obtains the plurality of exposure values corresponding to the luminance values and obtains a weighting-exposure value by an equation, and controls the image-pickup module to capture the panorama image according to the weighting-exposure value.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: February 10, 2015
    Assignee: Altek Corporation
    Inventors: Hong-Long Chou, Chia-Chun Tseng, Chia-Yu Wu
  • Patent number: 8896757
    Abstract: There is provided a delta-sigma A/D converter including a first integrator, a second integrator located on an output side of the first integrator, a quantizer located on an output side of the second integrator, and a first current D/A converter receiving an output of the quantizer and providing a negative feedback signal to an input side of the quantizer.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: November 25, 2014
    Assignee: Sony Corporation
    Inventor: Tomohiro Matsumoto
  • Patent number: 8830395
    Abstract: Systems and methods are provided for upscaling a digital image. A digital image to be upscaled is accessed, where the digital image comprises a plurality of pixel values. A first half pixel value is computed for a first point in the digital image based on a plurality of pixel values of the digital image surrounding the first point and an activity level. A second half pixel value is computed for a second point in the digital image, and an interpolated pixel of an upscaled version of the digital image is determined using a plurality of the pixel values, the first half pixel value, and the second half pixel value.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: September 9, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Yun Gong, Dam Le Quang
  • Patent number: 8804035
    Abstract: A method and system for communicating text descriptive data has a receiving device that receives a data signal having text description data corresponding to a description of a video signal. A text-to-speech converter associated with the receiving device converts the text description data to a first audio signal. A display device in communication with the text-to-speech converter converts the first audio signal associated with the receiving device to an audible signal.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: August 12, 2014
    Assignee: The DIRECTV Group, Inc.
    Inventors: Scott D. Casavant, Brian D. Jupin, Stephen P. Dulac
  • Patent number: 8059204
    Abstract: An apparatus for adjusting image color saturation and a method for adjusting a saturation level of an original image data are provided. The image color saturation apparatus includes a first color over-saturation level calculating unit, a parameter adjusting unit, a saturation adjusting unit and a second color over-saturation level calculating unit. The apparatus for adjusting image color saturation detects the number of over-saturation pixels in an input image according to a predefined over-saturation area, and the number of over-saturation pixels in an adjusted output image. Thus, the parameter adjusting unit can dynamically adjust a saturation gain to maintain the frame consistency according to the number of the over-saturation pixels.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: November 15, 2011
    Assignee: Realtek Semiconductor Corp.
    Inventors: Chun-Hsing Hsieh, Chia-Hui Kuo
  • Patent number: 8031269
    Abstract: In the chroma killer detection for detecting the abnormality of the burst signal, in addition to the circuits (1004, 1005, 1006) for detecting the states of the components of the burst signal, which circuits are for selecting the cos ? data of the burst signal, circuits (1050, 1051, 1052) for detecting the states of the R-Y components, which circuits are for selecting sin ? data are employed for chroma killer detection. Thereby, it is possible to enhance the detection precision of the abnormality states of the burst signal and the precision for discrimination of the broadcasting system.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: October 4, 2011
    Assignee: Panasonic Corporation
    Inventors: Kazuya Miyashita, Toshihiro Matsumura
  • Patent number: 7929058
    Abstract: A digital video processing apparatus and a control method thereof are provided, and include a signal receiving part for receiving a digital video signal, a decoder for separating a luminance signal from the digital video signal, and a filtering part for filtering the luminance signal separated in the decoder to substantially remove an interference signal contained in the luminance signal. Thus, the digital video processing apparatus can filter out interference signals contained in a luminance signal of a digital video signal.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: April 19, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jae-cheol Kim
  • Patent number: 7683896
    Abstract: A two-stage pixel skew compensation circuit for use with digital display monitors. The first stage of the compensation circuit aligns the edges of the pixels received on the color component signal lines of an analog video signal. The second stage of the de-skew compensation circuit realigns the pixels themselves so that no skew exists between the digitized video color components. The digitized video signals drive a digital video monitor.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: March 23, 2010
    Assignee: Avocent Huntsville Corporation
    Inventors: Victor Odryna, Barry Mansell, Gail E. Mansell, legal representative, Mark DesMarais, Robert L. Gilgen
  • Publication number: 20080094516
    Abstract: A camera apparatus having a digital image processing function for an analog transmission network is provided. The camera apparatus divides each of frames of first resolution digital image data into N equal regions, converting each frame of the digital image data into N fields by interlacing the regions in order of region numbers, and transmitting the N fields through the analog transmission network. High resolution image data of HDTV class created by the camera apparatus can be reproduced on an image display apparatus by using analog transmission networks laid for transmitting analog image data conforming to the analog NTSC, PAL, or SECAM standard without any change.
    Type: Application
    Filed: April 12, 2007
    Publication date: April 24, 2008
    Inventors: In Keon Lim, Byeong Jin Lim
  • Publication number: 20070216814
    Abstract: A receiver apparatus 3 has a digital circuit portion 13 that converts a compressed digital signal outputted from a digital demodulating portion 12 into digital video and audio signals and a video/audio output circuit 14 that converts the digital video and audio signals outputted from the digital circuit portion 13 into analog video and audio signals. With this configuration, a video/audio processing IC for digital signal processing no longer needs to be mounted on the circuit board of a video display apparatus 4, and thus a receiver system can be realized with a video display apparatus having a simple configuration.
    Type: Application
    Filed: December 6, 2006
    Publication date: September 20, 2007
    Applicant: Sharp Kabushiki Kaisha
    Inventor: Hitoshi Azuma
  • Patent number: 6822694
    Abstract: According to the signal processing apparatus of the present invention, in a text signal processing circuit, predetermined signal processes are executed to a luminance signal Y and color difference signals U and V in which a ratio of sampling clocks is equal to (4:4:4) and resultant signals are supplied to a mixing circuit. In a video signal processing circuit, predetermined signal processes are executed to the signals Y, U, and V in which a ratio of sampling clocks is equal to (4:1:1) or (4:2:2). The signal Y is supplied to the mixing circuit through a delay adjusting circuit and the high frequency components are removed from the signals U and V by a band limiting filter and, after that, the resultant signals are supplied to the mixing circuit. The signal mixed by the mixing circuit is supplied to a LPF through a D/A converter. In the LPF, the signal is demodulated by the band limiting filter according to (4:4:4).
    Type: Grant
    Filed: December 2, 1998
    Date of Patent: November 23, 2004
    Assignee: Sony Corporation
    Inventors: Shinichiro Miyazaki, Hiroyuki Kojima, Akira Shirahama, Hiroshi Sugaya
  • Patent number: 6753908
    Abstract: The invention provides a linear matrix circuit which can control linear conversion of color reproduction with a comparatively small number of parameters, which conform with a feeling of a human being, by means of a circuit of a comparatively small scale using a comparatively simple method. The linear matrix circuit performs linear conversion of color reproduction for use with an image processing apparatus which separates a video signal into three primary color components of red, green and blue, and includes a coefficient conversion section for introducing six coefficients required for the linear conversion of color reproduction from two control parameters.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: June 22, 2004
    Assignee: Sony Corporation
    Inventors: Hitoshi Nakamura, Keiichi Ito
  • Patent number: 6449421
    Abstract: A video signal processor which includes a reference signal generating circuit provided with at least an oscillation circuit for generating a reference signal corresponding to a burst signal and a Y/C separation circuit for separating a video signal into a luminance signal and a chrominance signal with an output of the reference signal generating circuit as a clock signal, and uses a microcomputer for controlling the entire operation of the video signal processor. In the video signal processor, an output of the reference signal generating circuit is also supplied to the microcomputer as a clock signal.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: September 10, 2002
    Assignee: Funai Electric Co., Ltd.
    Inventor: Yoshio Higuchi
  • Patent number: 6449020
    Abstract: A device for regulating the amplitude of a chrominance signal includes a variable gain amplifier having an input receiving a sub-carrier signal, and an output providing a regulated sub-carrier signal. The gain of the amplifier is controlled by two regulation loops. The first regulation loop operates during the duration of the reference burst. The second regulation loop operates during the visible line. Each of these loops include an up/down counter controlled by a clock. A digital-analog converter has an input receiving the output signals from the first and second up/down counters. An output signal from the digital-analog converter is connected to the gain control of the amplifier. The digital-analog amplifier is controlled by another clock.
    Type: Grant
    Filed: March 16, 1999
    Date of Patent: September 10, 2002
    Assignee: STMicroelectronics S.A.
    Inventors: Didier Salle, GĂ©rard Bret
  • Patent number: 6392713
    Abstract: A procamp to color transforms component digital video data. The procamp includes a digital multiplier coupled to receive component digital video data corresponding to at least two different pixel parameters. The digital multiplier is configured to selectively multiply the component video data for different pixel parameters by different factors.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: May 21, 2002
    Assignee: Media 100 Inc.
    Inventor: David Edwin Acker
  • 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: 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: 6016167
    Abstract: A method of color correcting digital video data 21 is disclosed, comprising the steps of providing a workstation 22 connected to a source 20 of digital video data, analysing video data at the workstation 22 and making decisions relating to color corrections to be applied to the video data 21, generating color correction parameter data corresponding to the decisions, transmitting the video data and the corresponding color correction parameter data 23 to a remote color processor 28 for applying color corrections to the digital video data 26, applying color corrections to the digital video data in accordance with the correction parameter data, and returning the color corrected video data 27 from the color processor 28.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: January 18, 2000
    Assignee: Pandora International, Ltd.
    Inventor: Stephen Brett
  • Patent number: 5953059
    Abstract: A color signal processing circuit of a camera DSP chip for use with a CCD includes a matrix circuit for converting color signals from the CCD into R-G and B-G signals, a hue/gain controlling circuit for multiplying the R-G signal by a R-hue coefficient and a R-gain coefficient and multiplying the B-G signal by a B-hue coefficient and a B-gain coefficient to form B-Y and R-Y signals by adding the R-G and B-G signals respectively multiplied by respective hue and gain coefficients, a zoom-processing circuit for zoom-processing the B-Y and R-Y signals converted in the hue/gain controlling circuit in a zoom mode, and a frequency converting circuit for synchronizing the B-Y and R-Y signals from the hue/gain controlling circuit or zoom-processed in the zoom-processing circuit with a clock having the frequency four times as large as a color burst signal to provide synchronized signals while loading the color burst signals.
    Type: Grant
    Filed: January 22, 1997
    Date of Patent: September 14, 1999
    Assignee: LG Semicon Co., Ltd.
    Inventor: Kye Shin Lee
  • Patent number: 5949496
    Abstract: A color correction device is disclosed for correcting color distortion in a displayed television image. Internal circuitry of a television receiver has a color signal distortion characteristic, and the cathode ray tube (CRT) in the television receiver has a gamma characteristic according to which display color is distorted. The color correction device includes an average luminance level calculator for calculating the average luminance level of an image signal displayed by the CRT. Based on the average luminance level calculated by the average luminance lever calculator, a selection is made of appropriate sets from a plurality of available sets of coefficient correction values and a plurality of sets of gamma correction values. The color signal input to the television receiver is then corrected according to the selected sets of coefficient correction values and gamma correction values.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: September 7, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jin-gu Kim
  • Patent number: 5905396
    Abstract: A clamp pulse generating circuit comprising a synchronizing decision circuit for deciding whether an external synchronizing pulse is being input or not; an exclusive-OR circuit, a change-over switch and a pulse width detecting circuit for deciding whether a video signal containing a synchronizing pulse is being input or not; and a pulse generating circuit for generating a clamp pulse at the front or rear edge of the external synchronizing pulse output from a synchronizing separator circuit, and outputting the clamp pulse at the front edge selected by a selection switch when the external synchronizing pulse is being input and forcing to select and output the clamp pulse at the rear edge of the synchronizing pulse irrespective of the presence of the external synchronizing pulse when the video signal containing the synchronizing pulse is being input.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: May 18, 1999
    Assignee: Sony Corporation
    Inventor: Seiichi Nishiyama
  • Patent number: 5563666
    Abstract: It is an object to avoid suppression of color signals before a green color signal G reaches a saturation detection level Gdet or before each of color signals R and B reaches its saturation level to thereby substantially faithfully reproduce color of an object. To this end, a high luminance color suppressing circuit includes a virtual luminance signal generator for generator for generating a virtual luminance signal Y based on at least one signal of input color signals Rin, Gin and Bin, a coefficient generator for generating a first through a third coefficient K.sub.1 through K.sub.3 based on a saturation detection level Gdet, a virtual detection level Gth, and maximum output levels Rmax and Bmax, and an output color signal generator for generating output color signals Rout, Gout and Bout based on the virtual luminance signal Y, a minimum coefficient K.sub.0 and the color signals Rin, Gin and Bin.
    Type: Grant
    Filed: April 13, 1995
    Date of Patent: October 8, 1996
    Assignee: U.S. Philips Corporation
    Inventor: Fuminori Suzuki
  • Patent number: 5532757
    Abstract: Chrominance signals of a digitized composite video signal are processed by including automatic phase control and automatic chroma control operations that use circuit elements that are concurrently available for both operations as well as for other signal processing operations. The automatic phase control operation calculates a phase error corresponding to a phase difference between a reference clock signal and a burst synchronization signal of the chrominance signal. The reference clock signal is generated in response to the phase error data, such that the phase error is minimized and the reference clock signal coincides with the burst synchronization signal. The automatic chroma control operation multiplies the chrominance signal by coefficient data corresponding to the difference between the chrominance signal and a reference value to generate a constant level chrominance signal.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: July 2, 1996
    Assignee: Sony Corporation
    Inventors: Shinichirou Miyazaki, Kazuo Watanabe
  • Patent number: 5452017
    Abstract: The color modification system receives standard red, green and blue signal values and outputs modified red, green and blue values in accordance with operator modification of the signals. To increase processing speed and minimize the amount of required memory while also maintaining high resolution, the system converts the input red, green and blue signals to two-component hue and saturation values for modification using look-up tables. Once the hue and saturation levels of the signals are modified, red, green and blue output signals are reconstructed using the modified hue and saturation values, as well as a calculated brightness value. In this manner, modification of three-component primary-color signals is achieved by manipulating only two-component hue and saturation values. The system also allows modification of the brightness level of each component of the video signal in accordance with operator control. Novel methods for the determination of hue and saturation are disclosed.
    Type: Grant
    Filed: October 25, 1994
    Date of Patent: September 19, 1995
    Inventor: Charles B. Hickman
  • Patent number: 5448424
    Abstract: An AGC circuit is provided with a variable gain amplifier which changes an amplification gain of an input signal in accordance with an instruction; an extraction unit for extracting a value of an output of the variable gain amplifier at a predetermined interval; and a variable gain control unit for instructing the amplification gain of the variable gain amplifier in a manner such that the amplitude of the input signal is equal to a predetermined amplitude on the basis of the value extracted by the extraction unit.
    Type: Grant
    Filed: February 15, 1994
    Date of Patent: September 5, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Akihiko Hirano, Terumi Takashi, Kazunori Iwabuchi, Hideyuki Yamakawa, Yoshiteru Ishida, Minoru Kosuge
  • Patent number: 5446504
    Abstract: An input section receives an image signal including signals related to colors to output at least a luminance signal component of the image signal. A compressing section compresses the dynamic range of the luminance signal component from the input section. A setting section obtains a compression coefficient from a relationship between the luminance signal component whose dynamic range is compressed by the compressing section and the luminance signal component from the input section. An operating section executes an operation for compressing dynamic ranges of the signals related to colors included in the image signal in accordance with the compression coefficient obtained by the setting section. A correcting section substantially corrects the color saturation of the signals related to a color included in the image signal while preserving the luminance of the image signal such that the color saturation is more intensively suppressed as the luminance becomes lower.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: August 29, 1995
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Tohru Wada
  • Patent number: 5432564
    Abstract: A reproducing circuit converts a low-band converted chrominance signal into digital signals for reproducing processing and outputs a high-band converted chrominance signal. In this reproducing circuit, the digitalized low-band chrominance signal is separated to phase data and amplitude data. The phase data is decoded, and the frequency and phase fluctuations thereof are corrected. The corrected phase data is encoded to generate a continuous wave. The generated continuous wave is multiplied by the amplitude data to obtain the high-band converted chrominance signal. Similarly, a recording circuit converts a high-band converted chrominance signal into digital signals for recording processing and outputs a low-band converted chrominance signal. In this recording circuit, the digitalized high-band chrominance signal is separated to phase data and amplitude data. The phase data is decoded, and the frequency and phase fluctuations thereof are corrected.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: July 11, 1995
    Assignee: Victor Company Of Japan, Ltd.
    Inventor: Junichiro Tonami
  • Patent number: 5359368
    Abstract: A line locked digital color demodulator separates the V and U color components and the burst signal and uses a ROM for providing phase shifts to the V and U demodulation axes. During the burst time of an NTSC signal, the color component axes are shifted by 45.degree. such that the burst signal produces equal components along the axes. A correction signal is developed in response to this shifting and is used in conjunction with a frequency error signal for continuously addressing the ROM. The error signal is developed by counting the number of clock pulses over a 16 line period and comparing the number counted with a standard number for the type signal being received. The error signal is combined with the correction signal for adjusting the phase of the V and U demodulation axes. For a PAL signal, the burst is normalized to always be at 135.degree. and its components along the V and -U axes are compared as with the NTSC signal.
    Type: Grant
    Filed: April 12, 1993
    Date of Patent: October 25, 1994
    Assignee: Zenith Electronics Corporation
    Inventor: Gopal K. Srivastava
  • Patent number: 5337083
    Abstract: A digital video camera includes a pseudo-saturation calculating circuit by which a pseudo-saturation corresponding to an actual saturation is calculated on the basis of two color difference signals, and a suppression coefficient is calculated by a suppression coefficient calculating circuit on the basis of the pseudo-saturation. Each of the color difference signals are outputted by a selecting circuit in a dot sequential manner, and multiplied by the suppression coefficient in a multiplying circuit. Therefore, a signal in which a low-saturation chrominance signal is outputted from the multiplying circuit, whereby the low-saturation chrominance signal can be suppressed even though a sampling frequency is not increased.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: August 9, 1994
    Assignee: Sanyo Electric Co., Ltd
    Inventors: Haruhiko Murata, Yukio Mori, Akihiro Maenaka, Masao Takuma, Kiyotada Kawakami, Tooru Yamamoto, Tooru Asaeda
  • Patent number: 5305094
    Abstract: The color balance, hue, saturation, luminance, and other parameters of digital video signals are corrected entirely in the digital domain. Correction signals are combined with the digital video signals and new digital video signals are created to replace the original signals. Thus, color correction is performed without victorial addition or similar techniques. A digital "six-vector" color correction circuit, as well as an infinitely variable color selection correction circuit are provided. Also provided is a window for isolating the color corrections, with the capability of limiting the isolation provided by the window to a single selected hue so that one color can be corrected under the restrictions of the window, while others are corrected free of those restrictions. A separate window can be provided simultaneously for each of six colors and the infinitely variable correction circuit. Different corrections of the same color can be made inside and outside of the window.
    Type: Grant
    Filed: May 19, 1992
    Date of Patent: April 19, 1994
    Assignee: Inprop, Inc.
    Inventors: Armand Belmares-Sarabis, Stanley J. Chayka