Nonlinear Amplitude Modification (e.g., Gamma) Patents (Class 348/674)
  • Patent number: 10321164
    Abstract: Systems, methods, and computer readable media are described for effectively using dither techniques upon signals having a predicted quantization error that varies across the range of the signal. In some embodiments, predicted error is used to shape a precision input signal so that the newly-shaped signal yields a uniform or relatively uniform predicted quantization error. A dither is applied to the re-shaped signal, and the shaping is reversed, after which the signal may be slope limited and/or quantized, taking full and efficient advantage of the dithering technique.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: June 11, 2019
    Assignee: Apple Inc.
    Inventors: Kenneth I. Greenebaum, Eric L. Dacquay, Ian C. Hendry
  • Patent number: 10121412
    Abstract: Disclosed is a display device and a timing controller that can check the status of a display driving related unit, take a proper countermeasure according to the check result, and prevent an abnormal operation of the display driving related unit or prevent a failure in driving, damage to a device, and screen abnormality that may happen according to the abnormal operation of the display driving related unit.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: November 6, 2018
    Assignee: LG DISPLAY CO., LTD.
    Inventor: Jinsol Choi
  • Patent number: 10102821
    Abstract: An image processing device includes a first look-up table in which first gamma correction values corresponding to a white grayscale are recorded; a second look-up table in which second gamma correction values corresponding to red, green, and blue grayscales are recorded; and a data correcting unit that calculates second image data from received first image data based on a first gamma correction value and a second gamma correction value for the first image data, by referring to the first and second look-up tables.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: October 16, 2018
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Hyun Min Cho, Jae Byung Park, Jae Woong Kang, Jong Hyuk Kang, Hyun Deok Im, Sung Jin Hong
  • Patent number: 10013903
    Abstract: The present embodiments relate to a source driver integrated circuit and a gamma reference voltage generator, which can improve the image quality by preventing or reducing the wavy noise phenomenon, i.e. display of a pattern of stripe-shaped transverse lines on the screen.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: July 3, 2018
    Assignee: SILICON WORKS CO., LTD.
    Inventors: HunYong Lim, YongSuk Kim
  • Patent number: 9967411
    Abstract: An image forming apparatus is provided. The image forming apparatus includes: a storage configured to store a color conversion table; an image former configured to print a compensation chart corresponding to the color conversion table; a scanner configured to scan the printed compensation chart; and a changer configured to understand a range of brightness that the image former is able to represent using the scanned compensation chart, generate a gamma curve corresponding to the understood range of brightness, and change the color conversion table based on the generated gamma curve.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: May 8, 2018
    Assignee: S-PRINTING SOLUTION CO., LTD.
    Inventors: Woo-jun Chung, Hyun-soo Oh, In-ho Park, Nam-ju Shin, Kyeong-man Kim
  • Patent number: 9886779
    Abstract: A display panel driver includes: a correction calculation section which performs correction calculations on input image data to generate saturation-enhanced output image data and a drive circuitry driving the display panel in response to the output image data and a starting point control section. The correction calculation section generates red (R) data, green (G) data and blue (B) data of the output image data by performing the correction calculations on R data, G data and B data of the input image data, respectively. The starting point control section controls the positions of starting points of the input-output curves of the correction calculations.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: February 6, 2018
    Assignee: Synaptics Japan GK
    Inventors: Takashi Nose, Hirobumi Furihata, Akio Sugiyama
  • Patent number: 9462255
    Abstract: A device includes a projection and camera system to create an augmented reality environment in which images are projected onto a scene and user movement within the scene is captured. The projection and camera system have a camera to image scattered IR light from the scene and compute time of flight values used in depth mapping of objects in the room. The system also has a projector to project the images onto the scene. The projected images and scattered IR light use a common optical path through the same lens. Additionally, an illumination system used to illuminate the scene with the IR light may also use the common optical path through the same lens. In one implementation, the projection and camera system are mounted in a movable head of a table lamp.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: October 4, 2016
    Assignee: Amazon Technologies, Inc.
    Inventors: Eric G. Marason, William Thomas Weatherford, Christopher D. Coley, Robert A. Yuan, Miguel Virgen
  • Patent number: 9436977
    Abstract: A method of grayscale compensation to defects on a display panel includes: (A) obtaining a set of coordination of the defect on the display panel, and determining a defect area where the defect locates based on the set of coordination; (B) obtaining a gamma curve of the defect, a gamma curve of a background of the defect area, and a standard gamma curve of the background of the display panel; (C) obtaining a standard gamma curve of the defect and a standard gamma curve of the background of the defect area; and (D) calculating a grayscale-compensation value for each grayscale of the defect, based on the standard gamma curve and the standard gamma curve of the background of the defect area. The present invention is to reduce calculation, and to achieve the best compensation to defects on a display panel.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: September 6, 2016
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd
    Inventors: Houliang Hu, Ping-sheng Kuo, Li-wei Chu
  • Patent number: 9350965
    Abstract: Provided are an image brightness controlling apparatus and method, and an adaptive brightness controlling apparatus and method based on the brightness degree and/or brightness range of an image. The image brightness controlling apparatus includes a brightness increment arithmetic unit for outputting a brightness increment for a pixel, and an individual component brightness increment arithmetic unit for outputting the brightness increments of individual components constituting the pixel in response to the brightness increment for a pixel. The individual component brightness increment arithmetic unit multiplies the brightness increment of the pixel by each of the unit vectors of the components constituting the pixel to obtain the brightness increments of the individual components. The image brightness controlling apparatus further includes an adder for adding the components constituting the pixel to the brightness increments of the components.
    Type: Grant
    Filed: August 8, 2007
    Date of Patent: May 24, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seong-deok Lee, Chang-yeong Kim, Yang-seock Seo, Yong-in Han
  • Patent number: 9319649
    Abstract: The present invention relates generally to adjusting projected images from a projector. A projected image is compensated to neutralize effects of a projection surface and optimized based on anticipated pixel drift movement.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: April 19, 2016
    Assignee: DISNEY ENTERPRISES, INC.
    Inventor: Anselm Grundhofer
  • Patent number: 9286824
    Abstract: A display apparatus includes a display unit which includes a plurality of pixels having an organic light emitting diode (OLED), a power supply which supplies power to the display unit, an image processor which processes an input image to display an image on the display unit, and a controller which determines whether an average picture level (APL) of the input image is a predetermined value or more. Based on the APL value, the controller controls the image processor to compensate for a gray scale of the input image to thereby increase a brightness of the input image, and controls the power supply to reduce the power supply corresponding to the brightness increased as a result of the compensated gray scale.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: March 15, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hyun-jeong Ryu, Hong-ju Na
  • Patent number: 9087481
    Abstract: A luminance correcting system for an organic light emitting display includes an image analyzing unit for analyzing an image on a display unit and for measuring luminance and color coordinates of reference gray level data, a reference offset value setting unit for setting reference offset values of respective color data in the reference gray level data to correspond to an image analysis result obtained by the image analyzing unit, a controller for detecting a difference in reference offset values of at least two color data among the respective color data in the reference gray level data and for comparing the difference with a reference value, and an additional offset value setting unit for setting an additional offset value corresponding to at least one gray level among gray level data excluding the reference gray level data when the difference in the reference offset values is not less than the reference value.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: July 21, 2015
    Assignee: Samsung Display Co., Ltd.
    Inventor: Jung-Kook Park
  • Publication number: 20150146107
    Abstract: Media is usually encoded using a non-linear transfer function that approximates human perception to more efficiently allocate codes to areas of dynamic range where human observers are more easily able to perceive differences in signal strength. Many common media operations, e.g., scaling, rotating, and gamut converting, must be performed in a linear representation to be correct and artifact-free. The non-linear transfer functions used are often pure-power functions, such as “gamma” functions. To avoid banding after transformation, as many as 17 bits are needed in the linear-space with 8-bit input. Thus, methods, computer readable media, and systems for reducing the number of bits required in the linear domain are described herein that substitute a piecewise linear function (e.g., a line segment followed by an offset curve) for a pure-power gamma function, such that a slope limit is applied to constrain the number of (additional) linear bits required (over the input precision).
    Type: Application
    Filed: September 30, 2014
    Publication date: May 28, 2015
    Inventors: Ken Greenebaum, Ian Hendry, David Hayward
  • Patent number: 9007392
    Abstract: The present invention provides a method for enhancing contrast of a color image displayed on a display system and an image processing system utilizing the same. In the present invention, the gray values of R, G, and B components of one color image are separately counted during processing the image. When calculating the corresponding output values for the gray values of R, G, and B components in each pixel, they are adapted to ratios between the gray values of R, G, and B components. Therefore, the present invention can effectively maintain the color distribution for a considerable degree and greatly enhance the image contrast.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: April 14, 2015
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Jian-rong Chen, Chun-chieh Chiu
  • Patent number: 8890901
    Abstract: A color management circuit and a related color management method are provided. The color management circuit is disposed in a display device which has a panel provided with a panel conversion characteristic. The color management circuit includes: a first nonlinear conversion circuit, a color matrix conversion circuit and a second nonlinear conversion circuit. The first nonlinear conversion circuit is utilized for performing a first nonlinear conversion upon a color data to generate a first conversion data. The color matrix conversion circuit is utilized for performing a liner matrix calculation upon the first conversion data to generate a matrix calculation data. The second nonlinear conversion circuit is utilized for performing a second nonlinear conversion upon the matrix calculation data to generate a second conversion data to the panel, wherein a combined conversion characteristic of the second conversion characteristic with the panel conversion characteristic is substantially linear.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: November 18, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Yu-Chung Lee, Pei-Chen Huang
  • Patent number: 8872985
    Abstract: Some embodiments provide for a modular video projector system having a light engine module and an optical engine module. The light engine module can provide narrow-band laser light to the optical engine module which modulates the laser light according to video signals received from a video processing engine. Some embodiments provide for an optical engine module having a sub-pixel generator configured to display video or images at a resolution of at least four times greater than a resolution of modulating elements within the optical engine module. Systems and methods for reducing speckle are presented in conjunction with the modular video projector system.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: October 28, 2014
    Assignee: RED.COM, Inc.
    Inventors: James H. Jannard, Stuart J. English, Gregory Alan Prior, Edmund Sandberg, Ryan Newham
  • Patent number: 8860891
    Abstract: A method and apparatus for increasing the effective contrast ratio and brightness yields for digital light valve image projectors using a variable luminance control mechanism (VLCM), associated with the projector optics, for modifying the light output and provide a correction thereto; and an adaptive luminance control module (ALCM) for receiving signals from the video input board, the adaptive luminance control module producing a signal on a VLCM bus connecting the variable luminance control mechanism and the adaptive luminance control module, the signal causing the variable luminance control mechanism to change the luminance of the light output and provide a corrected video signal for the projector.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: October 14, 2014
    Inventors: Eddie E. Allen, Thomas D. Strade, Christopher Coley
  • Patent number: 8860747
    Abstract: System and methods for gamut bounded saturation adaptive color enhancement are provided. Color enhancement incorporating gamut bounded saturation enhances colors of an pixel from a source color gamut such that the resulting color is within a target color gamut. This resulting color may, for example, take advantage of an expanded target color gamut of a display. Gamut bounded saturation may be implemented independently or in combination with RGB bounded saturation.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: October 14, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Vasudev Bhaskaran, Sujith Srinivasan, Nikhil Balram
  • Patent number: 8847976
    Abstract: A method, apparatus and system for transforming a calorimetric adjustment of a sequence of images from an input color space into an output color space includes a color adjustment device for determining a transformation table for converting the input color space of the sequence of images to an output color space, for applying a first order approximation to at least one subset of the sequence of images, the subsets of the sequence of images defined by the transformation table, and if the sequence of images has not reached convergence, for applying a second order approximation to at least one subset of the sequence of images. In one embodiment, the color components of the output color space are defined by a combination of intermediate terms, where the number of the intermediate terms corresponds to the number of input color space components. The transform is configured to survive a video distribution workflow.
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: September 30, 2014
    Assignee: Thomson Licensing
    Inventor: Pierre Jean Ollivier
  • Patent number: 8836715
    Abstract: A method of processing image data for display by a display panel of a display device. The method comprises receiving main image pixel data representing a main image and side image pixel data representing a side image, and performing a mapping of the pixel data to signals used to drive the display panel. The mapping is arranged to produce an average on-axis luminance which is dependent mainly on the main image pixel data and an average off-axis luminance which is dependent at least to some extent on the side image pixel data. A compression of the main image pixel data is performed in advance of or at least partly incorporated into the mapping, the compression being performed at least partly in dependence upon the main image pixel data and at least partly in dependence upon how the off-axis luminance varies with pixel data input to the mapping.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: September 16, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Benjamin John Broughton, Andrew Kay, Marc Paul Servais, Paul Antony Gass, Masahiro Esashi, Kenji Maeda, Tatsuo Watanabe, Yuuichi Sato, Yoshimitsu Inamori, Takashi Yasumoto
  • Patent number: 8803922
    Abstract: Methods and apparatuses to varying the apparent brightness of a display are described. The change in apparent brightness is accompanied by unchanged in relative contrast, rendering a display with higher or lower brightness while maintaining contrast fidelity. In exemplary embodiments, the signals for the middle tone levels are adjusted to increase or decrease the brightness intensity, while keeping constant the gamma correction. This maintains the relative contrast of images while rendering them at a different brightness. Implementations of the present process include an adjusted gamma correction lookup table, incorporated in the video card to modify the video signal before reaching the display. The present invention can be used for matching the brightness of two or more displays or to provide compensation for variations in display characteristics to ensure consistency in display brightness within a data processing model.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: August 12, 2014
    Assignee: Apple Inc.
    Inventor: Gabriel Marcu
  • Patent number: 8780273
    Abstract: There is a signal processing apparatus, including a gamma correction circuit that performs gamma correction on an input luminance signal and generates an output luminance signal, an output-to-input ratio calculation circuit that calculates a ratio of the output luminance signal to the input luminance signal as an output-to-input ratio of a luminance signal, and a color difference correction circuit that multiplies an input color difference signal by the output-to-input ratio of the luminance signal and generates an output color difference signal. As a result, by correcting the input color difference signal using the output-to-input ratio of the luminance signal, the output color difference signal in which color difference correction has been performed in view of influence of gamma correction can be generated.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: July 15, 2014
    Assignee: Sony Corporation
    Inventors: Kiyoshi Ikeda, Toshimichi Hamada, Yoichi Hirota
  • Patent number: 8743289
    Abstract: An image display apparatus of the present invention includes: a picture display unit that forms and displays an optical image based on a video signal; a gamma adjustment image display unit that displays a gamma adjustment image containing input/output characteristics of a signal level of the video signal in the displayed optical image; an adjustment operation unit that changes the displayed input/output characteristics on the image; and an input/output characteristics setting unit that sets input/output characteristics of the signal level of the video signal in accordance with the input/output characteristics changed on the image. The adjustment operation unit includes a point selecting part that selects an adjustment point desired to be changed in the input/output characteristics displayed in the image and a level changing part that is capable of changing both of an input level and an output level of the selected adjustment point.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: June 3, 2014
    Assignee: Panasonic Corporation
    Inventor: Kazuo Mukai
  • Patent number: 8659709
    Abstract: An object of the present invention is to obtain a display device having excellent display quality by appropriately modifying the chromaticity of images. In this display device, a correction processing part (CPU 30) determines a first chromaticity change amount stored in memory (31) on the basis of a first cumulative usage amount, which is the cumulative usage amount of an LED (17) up to a present time, the cumulative value having been measured by a counter (32), and the correction processing part also determines a second chromaticity change amount stored in the memory (31) on the basis of a second cumulative usage amount, which is the cumulative usage amount of the LED (17) up to a time when the chromaticity of a pixel is adjusted by a chromaticity adjusting part (CPU 30), the cumulative value having been measured by the counter (32).
    Type: Grant
    Filed: November 24, 2011
    Date of Patent: February 25, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tohru Hanaoka, Fumio Kokubo, Eiji Kurimoto, Ryoji Ishimura, Shota Inoue, Fumiaki Yamada
  • Patent number: 8654260
    Abstract: An image processing apparatus according to the present invention extracts a characteristic value of a luminance in relation to respective fields of an input video, and determines the presence of a scene change between adjacent fields. A gamma curve is then generated on the basis of the magnitude of the characteristic value. When a difference in the characteristic value between fields is larger than a predetermined value and a scene change does not exist, the gamma curve to be applied to a subsequent field is modified such that the correction characteristic of the gamma curve does not vary rapidly. The luminance is then corrected using the modified gamma curve.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: February 18, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Taisuke Nishio, Yuki Shindo
  • Patent number: 8633950
    Abstract: An image display device for special uses which improves a color resolution of a particular color and increases a color reproducibility is provided. In the image display device, an area in which a gradient is gentle is provided to a partial region of a gamma curve denoted by a relationship of an input value (gray level) and an output value (luminance relative value) so that chromaticity points on chromaticity coordinates are unevenly distributed, thereby improving a chromatic resolving power (color resolution) of a particular color. In this manner, the color reproducibility of special monitors which display images of a particular color range represented by a monitor for remote metical care and a monitor for surgical operation can be improved.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: January 21, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Kenji Okishiro, Toshiaki Kusunoki, Kenichi Yamamoto
  • Patent number: 8614719
    Abstract: A device can perform gamma correction by receiving a non-gamma compensated input; selecting, in response to the input value, a selected approximating interval out of a group of low-brightness approximating intervals and out of a group of high-brightness approximating intervals; multiplying a portion of the input value by a selected approximating interval slope to provide an intermediate result; adding the intermediate result to a selected approximating interval offset to provide the gamma compensated output value; and outputting a gamma compensated output value.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: December 24, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Michael Zarubinsky, Konstantin Berman, Arnold Yanof
  • Patent number: 8537177
    Abstract: System and methods for gamut bounded saturation adaptive color enhancement are provided. Color enhancement incorporating gamut bounded saturation enhances colors of an pixel from a source color gamut such that the resulting color is within a target color gamut. This resulting color may, for example, take advantage of an expanded target color gamut of a display. Gamut bounded saturation may be implemented independently or in combination with RGB bounded saturation.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: September 17, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Vasudev Bhaskaran, Sujith Srinivasan, Nikhil Balram
  • Publication number: 20130222698
    Abstract: In an embodiment, a host computing device includes an internal display and also includes a connector to connect to an external display. A cable is provided to connect to the connector and to connect to the external display. The cable includes video processing capabilities. For example, the cable may include a memory configured to store a frame buffer. The frame buffer may store a frame of video data for further processing by the video processing device in the cable. The video processing device may manipulate the frame in a variety of ways, e.g. scaling, rotating, gamma correction, dither correction, etc.
    Type: Application
    Filed: June 12, 2012
    Publication date: August 29, 2013
    Inventors: Anup K. Sharma, Scott P. Krueger, James M. Hollabaugh, Roberto G. Yepez, Brijesh Tripathi, Jeffrey J. Terlizzi
  • Patent number: 8520149
    Abstract: The present invention is a method and apparatus for increasing the effective contrast ratio and brightness yields for digital light valve image projectors using a variable luminance control mechanism (VLCM), associated with the projector optics, for modifying the light output and provide a correction thereto; and an adaptive luminance control module (ALCM) for receiving signals from the video input board, the adaptive luminance control module producing a signal on a VLCM bus connecting the variable luminance control mechanism and the adaptive luminance control module, the signal causing the variable luminance control mechanism to change the luminance of the light output and provide a corrected video signal for the projector.
    Type: Grant
    Filed: August 14, 2009
    Date of Patent: August 27, 2013
    Assignee: Allen Video Technology Inc.
    Inventors: Eddie A. Allen, Thomas D. Strade, Christopher Coley
  • Patent number: 8514166
    Abstract: A method of reducing power consumption in a liquid crystal display illuminated by a backlight device includes dimming the backlight and adjusting the intensity of the image to compensate for the dimmed backlight. A dimming factor for the backlight is based on a clipping point determining from the pixel intensity distribution of the image signal. The intensity of the image is adjusted based on the dimming factor, wherein a first tone mapping function is used to adjust pixel intensities below an intensity threshold and a second tone mapping function is used to adjust pixel intensities above the intensity threshold.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: August 20, 2013
    Assignee: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventors: Min Chen, Huajun Peng, Guoping Qiu, Chun Kit Hung, Wei Zhang
  • Patent number: 8497872
    Abstract: A method for correcting the white balance of a display by: setting a target color coordinates of a target white point at a predetermined color temperature and a group of gray levels in response to an user input command; constructing R, G, B images according to the group gray levels; measuring the luminance and corresponding color coordinates of the R, G, B based on the R, G, B images; selecting one color of R, G, B to be a base color and the other two colors to be adjustable colors; fixing the measured luminance of the base color; estimating target luminance of the two adjustable color based on the measured luminance of the base color; estimating the adjusted gray levels of the two adjustable colors based on estimated luminance of the adjustable colors and the Gamma table; and reconstructing the Gamma table based on the estimated adjusted gray levels of the two adjustable colors.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: July 30, 2013
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventor: Hsu-Pin Kao
  • Patent number: 8497943
    Abstract: A display driving circuit comprising a video signal transformation circuit, a reference voltage generating circuit, a DAC and an interpolation operational amplifier is provided. The video signal transformation circuit transforms an input video signal into a transformed video signal with a higher bit depth. The transformed video signal comprises an upper n bits data and a lower m bits data, wherein n+m equals a bit depth of the transformed video signal. The reference voltage generating circuit generates reference voltages. The DAC selects a first reference voltage and a second reference voltage to interpolation operational amplifier from the reference voltages according to an upper n bits data of the transformed video signal. The interpolation operational amplifier outputs a driving voltage to display device according to the first reference voltage, the second reference voltage and the lower m bits data of the transformed video signal.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: July 30, 2013
    Assignee: Novatek Microelectronics Corp.
    Inventors: Yu-Kuang Chang, Kuei-Chung Chang, Ming-Da Chiang
  • Patent number: 8477091
    Abstract: An information output unit according to the present invention includes a first-gamma-correction-information storing unit that stores gamma correction information suitable for display of an image by a first liquid crystal display unit, a gamma correction unit that applies gamma correction based on the gamma correction information stored in the first-gamma-correction-information storing unit to inputted image information and outputs obtained image information to the liquid crystal display unit, a second gamma-correction-information storing unit that stores, when gamma correction is applied to the image information outputted by the gamma correction unit, gamma correction information for obtaining image information suitable for display of an image by a second liquid crystal display unit, and a control unit that outputs the gamma correction information stored in the second-gamma-correction-information storing unit to the liquid crystal display unit.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: July 2, 2013
    Assignee: Funai Electric Co., Ltd.
    Inventor: Tatsuya Kita
  • Patent number: 8462274
    Abstract: Systems and methods in accordance with embodiments of the present invention are provided to compensate for the “envelope effect” that appears to an end user as a result of the sampling and digital processing of near-Nyquist frequency components of a video information signal. Embodiments of the present invention improve image quality by effectively nullifying gamma correction in areas where the envelope effect exists, enabling the human eye to perceive the displayed signal without the envelope effect.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: June 11, 2013
    Assignee: Broadcom Corporation
    Inventors: Advait Madhav Mogre, Darren Neuman, Brian Schoner
  • Patent number: 8451383
    Abstract: An image display device includes: an image projecting unit for externally performing enlargement projection of a main-image signal; a basic-property selecting unit for selecting a predetermined basic-gamma property from multiple basic-gamma properties of the main-image signal; a correction-property selecting unit for selecting a predetermined correction-gamma property from multiple correction-gamma properties of the main-image signal; a gamma-property calculating unit for calculating a gamma property for each signal level of the main-image signal based on the selected basic-gamma and correction-gamma properties; a gamma correcting unit for subjecting the main-image signal to gamma correction based on the calculated gamma property; an operating unit for outputting a first signal corresponding to a user's basic-gamma-property selection operation, and a second signal corresponding to a user's correction-gamma-property selection operation; and a control unit for controlling each of the selection operations of the
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: May 28, 2013
    Assignee: Sony Corporation
    Inventor: Takuro Shoji
  • Publication number: 20130120659
    Abstract: A gamma correction system and method for a display device are disclosed. According to one aspect, the gamma correction system includes a display panel configured to display an image, a measuring unit configured to acquire optical characteristic information from the image displayed on the display panel, and a display panel driver configured to convert a gamma data result value obtained after performing optical compensation for at least two sample gray values among a plurality of reference luminance values into a corresponding data voltage and calculate a data voltage for the rest of the luminance values for which optical compensation is not performed.
    Type: Application
    Filed: March 14, 2012
    Publication date: May 16, 2013
    Applicant: SAMSUNG MOBILE DISPLAY CO., LTD.
    Inventors: Sung-Un Park, Ji-Yun Son, Dong-Ho Yoon
  • Patent number: 8405768
    Abstract: A distribution ratio Rt? of sub-frames Pt and Qt that correspond to an input frame Ft is calculated based on motion of an image in an input frame. The calculated distribution ratio Rt? is then corrected according to a distribution ratio Rt?1 between sub-frames Pt?1 and Qt?1 corresponding to an input frame Ft?1 which is to be reproduced before the input frame Ft. A distribution ratio Rt is thus acquired.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: March 26, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ai Kawai
  • Patent number: 8363168
    Abstract: A difference sample data holder of a gamma correction device holds as difference sample data a difference between a corrected signal level and a yet-to-be-corrected signal level for each of multiple sample points set at equal intervals between the permissible minimum and maximum levels of an input video signal. A correction execution unit performs cubic interpolation operation using the difference sample data held in the difference sample data holder, and adds the operated result and the signal level of the input video signal to obtain the signal level of the corrected video signal.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: January 29, 2013
    Assignee: Renesas Electronics Corporation
    Inventors: Shinji Uchinuno, Fuminori Higashi
  • Patent number: 8339518
    Abstract: Low frequency components are extracted from a video signal for pixels in a specific area of an image carried by the signal. The low frequency components are allocated, based on luminance components of the signal, to gradations ranging from maximum to minimum levels exhibited by the luminance components, luminance histogram data being produced indicating the frequency of gradations for the pixels. The gradations are allocated to the pixels based on the luminance components to produce high-frequency component histogram data indicating the frequency of gradations for specific pixels each carrying a high frequency component. The luminance histogram data is corrected in accordance with the frequency of gradations in the high-frequency component histogram data to produce corrected luminance histogram data. A gradation correction curve is produced for correcting the gradations exhibited by the signal using the corrected data. The luminance components are corrected based on the correction curve.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: December 25, 2012
    Assignee: JVC Kenwood Corporation
    Inventors: Shingo Kida, Kenji Kubota
  • Patent number: 8334931
    Abstract: An image processing apparatus according to the present invention extracts a characteristic value of a luminance in relation to respective fields of an input video, and determines the presence of a scene change between adjacent fields. A gamma curve is then generated on the basis of the magnitude of the characteristic value. When a difference in the characteristic value between fields is larger than a predetermined value and a scene change does not exist, the gamma curve to be applied to a subsequent field is modified such that the correction characteristic of the gamma curve does not vary rapidly. The luminance is then corrected using the modified gamma curve.
    Type: Grant
    Filed: April 21, 2010
    Date of Patent: December 18, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Taisuke Nishio, Yuuki Shindo
  • Publication number: 20120300128
    Abstract: Systems and methods in accordance with embodiments of the present invention are provided to compensate for the “envelope effect” that appears to an end user as a result of the sampling and digital processing of near-Nyquist frequency components of a video information signal. Embodiments of the present invention improve image quality by effectively nullifying gamma correction in areas where the envelope effect exists, enabling the human eye to perceive the displayed signal without the envelope effect.
    Type: Application
    Filed: May 25, 2011
    Publication date: November 29, 2012
    Applicant: Broadcom Corporation
    Inventors: Advait Madhav MOGRE, Darren NEUMAN, Brian SCHONER
  • Patent number: 8279235
    Abstract: A color correction method is provided. Grey values of three primary colors of an image data are transformed into initial characteristic values in a color space. Three sets of characteristic values of a to-be-corrected apparatus when the apparatus displays the primary colors respectively are measured. The characteristic values of the image data are transformed into a set of adjusted brightness values of the primary colors according to the characteristic values and a color space transformation equation. Gamma curves of the apparatus when displaying the primary colors are measured and modified to generate new grey-value vs. brightness relationships for the primary colors, so as to obtain adjusted grey values of the primary colors corresponding to the adjusted brightness values.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: October 2, 2012
    Assignee: Wintek Corporation
    Inventors: Jyun-Sian Li, Chih-Chang Lai
  • Patent number: 8279352
    Abstract: In a video display device of the present invention, a main control unit is equipped with a user interface for varying correction values set to a range correction unit and controls a range correction unit by acquiring the corresponding correction values from a storage unit in accordance with correction level information input by the user interface. The storage unit stores range correction values for the video display unit in correspondence with each piece of the correction level information input by the user interface. Thus, it is possible to correct luminance ranges to suit the user's preference without causing a large luminance reduction.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: October 2, 2012
    Assignees: NEC Display Solutions, Ltd., Mitsubishi Electric Control Software Corporation
    Inventors: Masatoshi Abe, Yutaka Arai, Hiroki Iwataka
  • Patent number: 8279351
    Abstract: In accordance with at least one embodiment, a first representation of a first gamma curve is stored in a look-up table, a second representation of a second gamma curve is stored in a look-up table, and a video signal is modified in accordance with an interpolation of at least a portion of the first representation of the first gamma curve and at least a portion of the second representation of the second gamma curve. In accordance with at least one embodiment, the at least a portion of the first representation of the first gamma curve is multiplied by a one's complement of a normalized weight factor, the at least a portion of the second representation of the second gamma curve is multiplied by the normalized weight factor, and the results are added together to obtain an output video signal.
    Type: Grant
    Filed: October 26, 2009
    Date of Patent: October 2, 2012
    Assignee: RGB Systems, Inc.
    Inventor: Michael Bakhmutsky
  • Patent number: 8279234
    Abstract: The present invention relates to a gamma data generation method of a display device. In the method, gamma data including red gamma data, green gamma data, and blue gamma data is determined. A target luminance and a target color coordinate of a first reference gray are determined. Then, an image is displayed on a display device based on red, green, and blue input image signals for a first reference gray, and a first luminance and a first color coordinate from the image are measured. Then, it is determined whether a coordinate difference between the first color coordinate and the target color coordinate and a luminance difference between the first luminance and the target luminance are in an allowable error range or not.
    Type: Grant
    Filed: December 2, 2008
    Date of Patent: October 2, 2012
    Assignee: Samsung Display Co., Ltd.
    Inventors: Kyong-Tae Park, Hyo-Seok Kim
  • Patent number: 8269701
    Abstract: An organic light emitting display and a driving method thereof, capable of increasing manufacturing yield by widening a range of gamma correction. An exemplary organic light emitting display includes a display region with pixels at crossings of data and scan lines; a gamma correction unit; a gamma correction circuit; a data driver; and a scan driver. The gamma correction unit includes first and second register units for storing first and second gamma correction signals, the second gamma correction signal comprising a corrected first gamma correction signal; a booster unit for correcting the second gamma correction signal to generate a third gamma correction signal; and a multiplexer for selecting the second gamma correction signal or the third gamma correction signal outputted from the booster unit, and for transferring it to the gamma correction circuit.
    Type: Grant
    Filed: May 8, 2009
    Date of Patent: September 18, 2012
    Assignee: Samsung Display Co., Ltd.
    Inventor: Seung-Won Chegal
  • Patent number: 8264613
    Abstract: The present disclosure is directed to methods, systems, and apparatuses for modifying streaming video signals to be shown on a visual display. In one embodiment, a method includes receiving a streaming video signal with multiple display components. The method also includes isolating and transmitting the display components to a multiplier according to an associated clock signal for each of the display components. The method further includes fetching correction coefficients from a storage circuit. The correction coefficients correspond to individual display components. The method also includes presenting the correction coefficients to the multiplier along with the display components according to the associated clock signals, and adjusting the display components with the corresponding correction coefficients to form corrected display components of the streaming video signal. The method also includes collecting the adjusted display components into a corrected streaming video signal.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: September 11, 2012
    Assignee: Radiant ZEMAX, LLC
    Inventors: Scott Harris, Tyler Harris, Ronald F. Rykowski
  • Patent number: 8259125
    Abstract: Methods for gamut mapping and boosting a color saturation of a color signal having multiple colors and a color value for each color. An example method includes mapping each color from a first to a second color space, adjusting each color in the mapped color signal including boosting a color saturation; determining a maximum color value of the color signal; and, in response to a determining that the maximum color value exceeds a maximum displayable color value, setting the color value of the color having the maximum color value to be equal to the maximum displayable color value and scaling color values of colors not having the maximum color value.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: September 4, 2012
    Assignee: Texas Instuments Incorporated
    Inventors: Rajeev Ramanath, Larry L. Jenkins
  • Patent number: 8253752
    Abstract: This application includes devices and methods for processing multimedia data to generate enhanced multimedia data at a receiver based on encoder assisted pre-processing. In one aspect, processing multimedia data includes identifying at least one pixel intensity range in at least one image of multimedia data, modifying at least a portion of the multimedia data to reduce the pixel intensity range, and encoding the modified multimedia data to form encoded multimedia data.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: August 28, 2012
    Assignee: QUALCOMM Incorporated
    Inventor: Vijayalakshmi R. Raveendran