Including Adaptive Artifacts Removal (e.g., Switchable Trap Or Lpf In Luma Channel) Patents (Class 348/666)
  • Patent number: 10201746
    Abstract: A method and apparatus for the detection, analysis, and identification of realistic human body and limb movements during sports actions for multiple uses comprises collecting the health information of the move, using the moves as a training and monitoring techniques in live usage settings, and as inputs to simulators and video game environments. At least one body-worn sensor transmits values wirelessly to a computing device that records the moves and calculates the health statistics then uses a machine-learning algorithm to analyze and identify the moves. These algorithms then output information and can simulate realistic moves, identify how far from these realistic moves the actual move is, and apply these moves to an electronic game. These algorithms, through various techniques, can distinguish movements, identify many different fine-grain movements, and enforce the full completion of these moves before registering them, thus preventing cheating in a realistic gaming scenario.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: February 12, 2019
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Majid Sarrafzadeh, Jack Bobak Mortazavi, Xiaolong Li, Kin Chung Chu
  • Patent number: 9954702
    Abstract: A radio communication device has a local oscillator to generate a local signal, a first mixer to mix a binary continuous phase frequency shift keying signal and the local signal so as to generate a baseband signal, a first filter to remove an unnecessary frequency component included in the baseband signal, a delay device to delay an output signal of the first filter by one symbol, and a wave detector to demodulate the continuous phase frequency shift keying signal, wherein a modulation index m of the continuous phase frequency shift keying signal is a value expressed by m=n+k where 0<n<1 is satisfied and k is an integer of 0 or more, and a frequency of the local signal is a frequency shifted by a frequency corresponding to 0 or 1 of the continuous phase frequency shift keying signal.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: April 24, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hidenori Okuni, Akihide Sai, Masanori Furuta
  • Patent number: 8810731
    Abstract: Systems and methods are disclosed herein for a motion detection system for video signal processing that includes a luminance motion detector, a chroma motion detector, and a smoothness detector. These systems and methods may also include a phase motion detector, a baseband YC separation circuitry for video signal processing, a chip for video signal processing, and a video signal processing system used in an electronic article.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: August 19, 2014
    Assignee: STMicroelectronics Asia Pacific Pte., Ltd.
    Inventor: Patricia Chiang Wei Yin
  • Patent number: 8698960
    Abstract: A decoder and a method for separating luminance and chrominance information from a target pixel in a composite video signal are provided. The decoder comprises a delay module, a filter module, a weighting factor generator, and a separator. The delay module is configured to delay a plurality of horizontal lines of the composite video signal to output a plurality of pixels including the target pixel. The filter module is coupled to the delay module and configured to filter the composite video signal in a horizontal direction and a vertical direction to generate a plurality of frequency components. The weighting factor generator is configured to generate a first weighting factor of the target pixel according to the horizontal direction and a second weighting factor of the target pixel according to the vertical direction. The separator is configured to separate luminance information from the target pixel in accordance with the frequency components, the first weighting factor, and the second weighting factor.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: April 15, 2014
    Assignee: Mediatek Inc.
    Inventor: I-Hong Chen
  • Patent number: 8620104
    Abstract: Disclosed herein is a movement-adaptive noise reduction apparatus, including a memory, a mixing control section, a movement component extraction section, a low-pass filter section, and a movement decision control section. In the apparatus, the movement decision control section and the low-pass filter section receive, from the outside, information regarding the gain value upon an amplification process to which the image signal is subjected before inputted to the mixing control section to control at least one of the threshold value and the filter characteristic in response to the information.
    Type: Grant
    Filed: June 3, 2013
    Date of Patent: December 31, 2013
    Assignee: Sony Corporation
    Inventors: Hirotake Cho, Masahiro Toshida
  • Patent number: 8553155
    Abstract: A system and method for improved comb filtering. Various aspects of the present invention may comprise method steps and system components that generate a signal indicative of the quality of a field-combed signal. A first signal indicative of inter-field and inter-line signal difference substantially inside the chroma frequency band may be generated. An indication of field comb quality may be determined based at least in-part on the first signal, and a corresponding signal may be generated. Various aspects of the present invention may comprise method steps and system components that generate a comb-filtered signal. A field comb signal and line comb signal may be generated. A comb-filtered signal may be generated based on the field comb signal, line comb signal, and the signal indicative of the field comb quality.
    Type: Grant
    Filed: March 5, 2004
    Date of Patent: October 8, 2013
    Assignee: Broadcom Corporation
    Inventor: Alexander G. MacInnis
  • Patent number: 8422814
    Abstract: Unnecessary flare correction at the boundary between a blanking area and video signal area is suppressed. An image quality improving apparatus includes 2-dimensional low-pass filter circuit 2 that extracts low-frequency components from an input video signal; subtractor circuit 4 that obtains high-frequency components by subtracting the low-frequency components extracted by 2-dimensional low-pass filter circuit 2 from the input video signal; and adder circuit 6 that adds the high-frequency components obtained by subtractor circuit 4 as a correction signal to the input video signal. The input video signal contains blanking signals without any video information. 2-dimensional low-pass filter circuit 2 starts extraction of the low-frequency components after a lapse of a predetermined unit time from when the input video signal changed from the blanking signal to the signal that contains the video information.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: April 16, 2013
    Assignee: NEC Display Solutions, Ltd.
    Inventor: Eifu Nezu
  • Patent number: 8411207
    Abstract: A device for outputting a luminance signal and a method thereof are disclosed. The device includes an image smoothing unit, a band pass filter unit, and a summing unit. The image smoothing unit receives a 2D luminance signal and decreases a signal intensity of a component of the 2D luminance signal within a frequency range with respect to a carrier frequency of a chrominance component. The band pass filter unit passes the component of the 2D luminance signal within the frequency range with respect to the carrier frequency. The summing unit sums the output of the image smoothing unit and the output of the band pass filter unit to generate a resultant luminance signal. The present invention is capable of avoiding the occurrence of saw-tooth or sparkling situation caused by inharmonious switching between a 1D comb filter and a 2D comb filter.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: April 2, 2013
    Assignee: Silicon Integrated Systems Corp.
    Inventors: Albert Hua Tai, Feng Chi Wei, Heng Yi Liu
  • Patent number: 8269896
    Abstract: An error reduction apparatus includes a combing absence detector to detect absence of combing from a luminance signal, a combing presence detector to detect presence of combing from a color-difference signal, a vertical low-pass filter to receive the color-difference signal, and a selector to select one of the color-difference signal and a color-difference signal to which the vertical low-pass filter is applied based on detection results of the combing absence detector and the combing presence detector, and if combing is absent in the luminance signal and combing is present in the color-difference signal, the error reduction apparatus applies the vertical low-pass filter to the color-difference signal and outputs the signal.
    Type: Grant
    Filed: April 24, 2009
    Date of Patent: September 18, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Takashi Katou
  • Patent number: 8248536
    Abstract: The invention provides techniques for separating luma and chroma signal components in a composite SECAM video signal. During reception, the SECAM video signal is split into luma and chroma output. The amplitude of the chroma carrier is monitored during reception. If the chroma carrier amplitude is greater than a threshold, the value of the chroma output can be reduced. Also, if the chroma carrier amplitude is greater than another threshold, a portion of the chroma carrier can be added to the luma; or the trap band of the band-trap filter for extracting luma from the composite video can be reduced. The respective amount of the reduction in the chroma output and the increase in the luma output are independently determined but both may proportional to the magnitude of the deviation in the chroma carrier amplitude from the different thresholds.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: August 21, 2012
    Assignee: ATI Technologies, Inc.
    Inventors: Dongsheng Wu, Robert B. Prozorov, Huijuan Liu, Christopher D. Jurado, Daniel Zhu, Binning Chen
  • Patent number: 8237866
    Abstract: A system, apparatus and method are disclosed for separating a current frame of a composite video signal into a luminance signal and a chroma signal. A relative chroma correlation value is generated using a plurality of lines of the current frame. A weighted sum of inter-line pixel differences of the current frame is generated using the relative chroma correlation value. A frame difference signal is generated by subtracting a previous frame of the composite video signal from the current frame. A detected motion signal is generated that corresponds to motion detected in the current frame. The weighted sum of inter-line pixel differences, the frame difference signal, and the detected motion signal are combined to generate the chroma signal. The chroma signal is subtracted from the current frame to generate the luminance signal.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: August 7, 2012
    Assignee: STMicroelectronics, Inc.
    Inventor: Patricia Chiang Wei Yin
  • Patent number: 8218084
    Abstract: A signal separator for separating luminance and color signals from a composite video signal includes: a first line delay element for delaying the composite video signal by one line period; a second line delay element for delaying the composite video signal by two line periods; an adder element for adding the first and second delay signals; a subtraction element for subtracting the second delay signal from the first delay signal; a control signal generator for passing a part of the addition signal within a predetermined frequency band therethrough; and a gain control element for reducing a level of the subtraction signal based on the control signal.
    Type: Grant
    Filed: August 16, 2007
    Date of Patent: July 10, 2012
    Assignee: DENSO CORPORATION
    Inventor: Mitsutoshi Nagata
  • Patent number: 8218085
    Abstract: A signal separator for separating luminance and color signals from a composite video signal includes: a first band pass element for passing a part of the composite video signal within a color signal band and within a predetermined frequency band; a second band pass element for passing a part of the first filtered signal within the color signal band and without the predetermined frequency band; and a first subtraction element for subtracting the first filtered signal from the composite video signal, wherein the predetermined frequency band is a frequency range in which the separation of the composite video signal into the color and the luminance signals is difficult.
    Type: Grant
    Filed: August 16, 2007
    Date of Patent: July 10, 2012
    Assignee: DENSO CORPORATION
    Inventor: Mitsutoshi Nagata
  • Patent number: 8199256
    Abstract: To provide a three-dimensional Y/C separating circuit that has a high responsibility to a motion in a video signal and can reduce a memory capacity, a three-dimensional Y/C separating circuit has a 2-frame memory 14 that delays a color signal by an inversion period thereof to produce a delayed composite video signal, a luminance motion detecting part that produces a first frame correlation signal by a subtraction processing between the delayed composite video signal and a composite video signal, an adding circuit 23 that produces a mixed video signal by an addition processing between the delayed composite video signal and the composite video signal, a frame memory 24 that delays the mixed video signal by one frame period, a subtracting circuit 25 that produces a second frame correlation signal by a subtraction processing between the mixed video signal and the mixed video signal delayed by one frame period, a determining circuit 26 that determines a motion from the first and second frame correlation signals an
    Type: Grant
    Filed: August 6, 2008
    Date of Patent: June 12, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mari Kaneko, Hirotoshi Aizawa
  • Patent number: 8179479
    Abstract: A method for separating luminance and chrominance of a composite TV analog signal includes the steps of: measuring first differences between horizontal neighbor pixels, second differences between vertical neighbor pixels and third differences between temporal neighbor pixels encoded in the composite TV analog signal; comparing the first, second and third differences with one another to obtain a minimum difference used as a factor of a weighting function; and filtering the composite TV analog signal simultaneously by a two-dimensional (2D) comb filter and a three-dimensional (3D) comb filter according to the weighting function on the basis of the minimum difference to obtain a luminance signal and a chrominance signal, in which magnitudes of a part of the composite TV analog signal filtered by the 2D comb filter and magnitudes of the other part of the composite TV analog signal filtered by the 3D comb filter are determined by the weighting function.
    Type: Grant
    Filed: June 9, 2008
    Date of Patent: May 15, 2012
    Assignee: Himax Media Solutions, Inc.
    Inventors: Ling-Hsiu Huang, Shing-Chia Chen
  • Patent number: 8155476
    Abstract: An image processing apparatus includes a noise reduction unit configured to nonlinearly convert a signal obtained by subtracting a value of a subtraction image signal, which is read from a memory, from that of a current-frame image signal, to generate a noise-reduced signal by subtracting the nonlinearly converted signal from the current-frame image signal, and to store the noise-reduced signal in the memory, a read unit configured to read the subtraction image signal from the memory at a moment between a moment, at which the subtraction image signal read from the memory is stored in the memory, and a moment at which the subtraction image signal is read from the memory, and a generation unit configured to generate an image based on the subtraction image signal read by the read unit.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: April 10, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tadayoshi Nakayama
  • Patent number: 8090215
    Abstract: A system determines the noise level of image data by high pass filtering image data. Absolutes values of the high pass filtered image data are determined. Thereafter, multiple mean values for absolute values less than a predetermined number of threshold values are determined. Based upon the determined mean values, a plurality of estimated mean values is calculated, each estimated mean value being calculated from a combination of two determined mean values. The noise of the image is determined from a combination of the minimum estimated mean value and the maximum estimated mean value. This noise can be optionally used by a sigma filter, at Step S740, to sigma filter the image data.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: January 3, 2012
    Assignee: Xerox Corporation
    Inventor: Stuart A. Schweid
  • Patent number: 8077997
    Abstract: An image processing method and an image processing apparatus are provided. After receiving an image signal, the image and apparatus according to the invention first judge whether a target block in the image signal includes a non-chroma line. If the judging result is YES, a first edge detection procedure will be performed on the non-chroma line. If the judging result is NO, a second edge detection procedure will be performed on the target block.
    Type: Grant
    Filed: June 4, 2008
    Date of Patent: December 13, 2011
    Assignee: MStar Semiconductor, Inc.
    Inventors: Ming-Hao Liao, Jen-Shi Wu, Chung-Yi Chen
  • Patent number: 8072546
    Abstract: A method for reducing cross-luminance in an image display device includes receiving luminance signals of a plurality of frames in a composite video signal, determining a movement condition of a first frame of the plurality of frames according to the luminance signals, performing a filtering operation for the first frame according to the movement condition of the first frame, and outputting a result of the filtering operation.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: December 6, 2011
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Teng-Yi Lin, Pao-Jen Chen
  • Patent number: 8064721
    Abstract: One embodiment of the present invention provides a system that removes noise from an image. During operation, the system first identifies blobs in the image, wherein a blob is a set of contiguous pixels which possibly represents a character or a portion of a character in the image. Next, the system analyzes the blobs to dynamically determine a “noise threshold” for the blobs. The system then removes blobs from the image which are below the noise threshold.
    Type: Grant
    Filed: December 28, 2009
    Date of Patent: November 22, 2011
    Assignee: Adobe Systems Incorporated
    Inventor: Dennis G. Nicholson
  • Patent number: 8055093
    Abstract: A system determines the noise level of image data by high pass filtering image data. Absolutes values of the high pass filtered image data are determined. Thereafter, multiple mean values for absolute values less than a predetermined number of threshold values are determined. Based upon the determined mean values, a plurality of estimated mean values is calculated, each estimated mean value being calculated from a combination of two determined mean values. The noise of the image is determined from a combination of the minimum estimated mean value and the maximum estimated mean value. This noise can be optionally used by a sigma filter, at Step S740, to sigma filter the image data.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: November 8, 2011
    Assignee: Xerox Corporation
    Inventor: Stuart A. Schweid
  • Patent number: 8049820
    Abstract: A video processing circuit capable of processing a composite signal and a non-composite signal, includes: a line buffer; a frame buffer; a video decoder for decoding the composite signal by utilizing the line buffer and the frame buffer as temporary buffers of the video decoder; a cross color suppressor for performing color suppression on the non-composite signal by utilizing the line buffer and the frame buffer as temporary buffers of the cross color suppressor; and a path controller, coupled to the video decoder and the cross color suppressor, for coupling the line buffer and the frame buffer to the video decoder or the cross color suppressor when utilizing the line buffer and the frame buffer is required.
    Type: Grant
    Filed: August 6, 2007
    Date of Patent: November 1, 2011
    Assignee: Mediatek Inc.
    Inventors: Po-Wei Chao, I-Hong Chen
  • Patent number: 7970235
    Abstract: In a method of automatically replacing undesirable pixels in an image, a local neighborhood of pixels is identified around an undesirable pixel. In addition, secondary neighborhoods of pixels are identified and feature values of the pixels contained in the local neighborhood and each of the secondary neighborhoods are calculated. The secondary neighborhoods having feature values within a predetermined range of the local neighborhood feature value are classified as candidates for pixel value replacement. Moreover, a replacement pixel value from at least one of the secondary neighborhoods classified as a candidate for pixel value replacement is determined and the undesirable pixel value is replaced with the replacement pixel value.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: June 28, 2011
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Ruth Bergman, Hila Nachlieli, Gitit Ruckenstein
  • Patent number: 7920211
    Abstract: A cross-color/dot interference reduction circuit according to one embodiment of the present invention includes a signal generation unit configured to calculate a difference in an input signal between adjacent frames and generate a difference signal, a component extraction unit configured to extract a cross-color/dot interference component from the difference signal, a combination output unit configured to combine an interference reduction signal corresponding to the cross-color/dot interference-component with the input signal and provide an output signal with a reduced cross-color/dot interference, an image scene analysis unit configured to analyze an image scene contained in the input signal, and a signal amplification/attenuation unit configured to amplify/attenuate the interference reduction signal based on an image scene analysis result from the image scene analysis unit.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: April 5, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuichi Honda
  • Patent number: 7868950
    Abstract: In a method of processing an input image, compression parameters of the input image are determined and luminance artifacts in the input image are reduced to obtain an improved luminance component of the input image, where the determined compression parameters guide the luminance artifact reduction. In addition, a chrominance noise and chrominance artifact level of the input image is estimated and a spatially-correlated chrominance noise and chrominance artifact of the input image is reduced with the improved luminance component, where the estimated chrominance noise and chrominance artifact level guide the spatially-correlated chrominance noise and chrominance artifact reduction to obtain an improved chrominance component of the input image. Moreover, an output image having the improved luminance component and the improved chrominance component is outputted.
    Type: Grant
    Filed: April 17, 2006
    Date of Patent: January 11, 2011
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Ramin Samadani, Suk Hwan Lim
  • Patent number: 7847862
    Abstract: A method for processing an image in a video data is provided. The video data has a plurality of frames. The method includes: obtaining a plurality of differences, each difference in the plurality of differences being obtained from two frames that are one frame apart, wherein the each difference in the plurality of differences is between pixel information of one pixel from a plurality of pixels in one of the two frames, and a corresponding pixel in the other frame of the two frames; examining a first criterion with a summation of the plurality of differences; and performing cross color suppressing operation on a current frame of the plurality of frames according to a set of stationary image judgment information comprising the result of the first criterion examination.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: December 7, 2010
    Assignee: Realtek Semiconductor Corp.
    Inventor: Po-Wei Chao
  • Patent number: 7742110
    Abstract: I describe and claim a temporal comb filtering system and method. The temporal comb filter system includes a comb filter to temporally process separated luminance and chrominance components from an image field responsive to image data from at least one other image field and a panel to display the processed components. The comb filter includes a cross-chroma detector to detect luminance information within chrominance data from a first image field responsive to chrominance data from at least one other image field and a cross-luma detector to detect chrominance information within the luminance data from the first image field responsive to the luminance data from at least one other image field.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: June 22, 2010
    Assignee: Pixelworks, Inc.
    Inventor: Neil D. Woodall
  • Patent number: 7724308
    Abstract: A cross color suppressing apparatus used for suppressing the cross color of a frame is provided. The frame has several pixels, and the image data of each pixel include a luminance and a chrominance. The apparatus includes a diagonal edge detector, a cross color detector and a chrominance suppressing unit. The diagonal edge detector is used for determining whether target pixel is on a diagonal edge according to the luminance of the target pixel and that of its neighboring pixels. The cross color detector is used for determining whether the chrominance of the target pixel is substantially different from that of its neighboring pixels. If both the determination results of the diagonal edge detector and the cross color detector are true, the chrominance suppressing unit suppresses the chrominance of the target pixel and its neighboring pixels.
    Type: Grant
    Filed: January 11, 2006
    Date of Patent: May 25, 2010
    Assignee: Himax Technologies Limited
    Inventor: Fung-Jane Chang
  • Patent number: 7697075
    Abstract: A method and system for suppressing color-crossing error in decoded video signals is presented. The color-crossing error suppression method and system uses a first suppression technique at a pixel location for a first subset of fields exhibiting color-crossing error at a pixel location then uses a second suppression technique at the pixel location for a second subset of fields exhibiting color-crossing error at the pixel location. The second subset of fields follows the first subset of fields in the video signals.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: April 13, 2010
    Assignee: Huaya Microelectronics, Ltd.
    Inventor: Ge Zhu
  • Patent number: 7688387
    Abstract: Separation of luma and chroma in a video. In an embodiment, values on a current line of the sampled video signal, at ¼-period intervals, are compared with values on a previous line of the sampled video signal, at ¼-period intervals. Values on the current line of the sampled video signal are compared to values on a subsequent line of the sampled video signal. This gives information about the vertical frequency content. Values on the current line are compared with values having the same chroma phase on the same line to provide information about horizontal frequency content. The data of vertical and horizontal frequency logic are used by the decision logic to determine the appropriateness of combing based on these comparisons. If combing is not appropriate, the signal is bandpass filtered instead of combed. The low-pass and combing filters are applied to the original signal, not an interpolated or resampled signal.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: March 30, 2010
    Assignee: Broadcom Corporation
    Inventor: Shawn V Johnson
  • Patent number: 7660483
    Abstract: One embodiment of the present invention provides a system that removes noise from an image. During operation, the system first identifies blobs in the image, wherein a blob is a set of contiguous pixels which possibly represents a character or a portion of a character in the image. Next, the system analyzes the blobs to dynamically determine a “noise threshold” for the blobs. The system then removes blobs from the image which are below the noise threshold.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: February 9, 2010
    Assignee: Adobe Systems, Incorporated
    Inventor: Dennis G. Nicholson
  • Patent number: 7657098
    Abstract: A ringing area detector classifies the input image into two regions: a mosquito noise region (i.e. filtering region) and a non-mosquito noise region (i.e. non-filtering region), and uses this classification information to adaptively remove the mosquito noise in a mosquito noise reduction system. The mosquito noise reduction system includes a ringing area detector, a local noise power estimator, a smoothing filter, and a mixer. The ringing area detector includes an edge detector, a near edge detector, a texture detector, and a filtering region decision block. The ringing detection block detects the ringing area where the smoothing filter is to be applied. The local noise power estimator controls the filter strength of the smoothing filter. The smoothing filter smoothes the input image. The mixer mixes the smoothed image and the original image properly based on the region information from the ringing area detection block.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: February 2, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Peng Lin, Yeong-Taeg Kim, Seong-Joo Lee
  • Publication number: 20090278990
    Abstract: An error reduction apparatus includes a combing absence detector to detect absence of combing from a luminance signal, a combing presence detector to detect presence of combing from a color-difference signal, a vertical low-pass filter to receive the color-difference signal, and a selector to select one of the color-difference signal and a color-difference signal to which the vertical low-pass filter is applied based on detection results of the combing absence detector and the combing presence detector, and if combing is absent in the luminance signal and combing is present in the color-difference signal, the error reduction apparatus applies the vertical low-pass filter to the color-difference signal and outputs the signal.
    Type: Application
    Filed: April 24, 2009
    Publication date: November 12, 2009
    Applicant: NEC Electronics Corporation
    Inventor: Takashi Katou
  • Publication number: 20090237568
    Abstract: A decoder and a method for separating luminance and chrominance information from a target pixel in a composite video signal are provided. The decoder comprises a delay module, a filter module, a weighting factor generator, and a separator. The delay module is configured to delay a plurality of horizontal lines of the composite video signal to output a plurality of pixels including the target pixel. The filter module is coupled to the delay module and configured to filter the composite video signal in a horizontal direction and a vertical direction to generate a plurality of frequency components. The weighting factor generator is configured to generate a first weighting factor of the target pixel according to the horizontal direction and a second weighting factor of the target pixel according to the vertical direction. The separator is configured to separate luminance information from the target pixel in accordance with the frequency components, the first weighting factor, and the second weighting factor.
    Type: Application
    Filed: March 18, 2008
    Publication date: September 24, 2009
    Applicant: MEDIATEK INC.
    Inventor: I-Hong Chen
  • Patent number: 7554610
    Abstract: A method and system for detecting color-crossing error in decoded video signals is presented. The color-crossing error detection method and system detects a color-crossing pattern in a set of corresponding pixels that share a pixel location. Each pixel of the set of corresponding pixels comes from a different field of a set of fields, which includes a current field having a current pixel. The method and system determines that color-crossing error exists at the current pixel when the color-crossing pattern exists for a user configurable number of sequential fields of the same field type at the pixel location.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: June 30, 2009
    Assignee: Huaya Microelectronics, Ltd
    Inventor: Ge Zhu
  • Patent number: 7535515
    Abstract: Methods and apparatus, including computer program products, implementing and using techniques for distinguishing false motion from true motion, in a video signal that is received by a television set. The video signal is received at the television set. The video signal includes a luma component and a chroma component. A motion detection operation is performed for each of the chroma component and the luma component in several frequency regions of the received video signal. Each frequency region has a unique, adjustable threshold value for distinguishing false motion from true motion, that is dynamically adjustable based on the incoming video signal, and as a result the motion detection accuracy is improved and image artifacts are minimized in an image that is described by the video signal and is to be displayed on the television set.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: May 19, 2009
    Inventors: Ravi Ananthapur Bacche, Xu Dong
  • Patent number: 7532254
    Abstract: I describe and claim a temporal comb filtering system and method. The temporal comb filter system includes a comb filter to temporally process separated luminance and chrominance components from an image field responsive to image data from at least one other image field and a panel to display the processed components. The comb filter includes a cross-chroma detector to detect luminance information within chrominance data from a first image field responsive to chrominance data from at least one other image field and a cross-luma detector to detect chrominance information within the luminance data from the first image field responsive to the luminance data from at least one other image field.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: May 12, 2009
    Assignee: Pixelworks, Inc.
    Inventor: Neil D. Woodall
  • Patent number: 7511769
    Abstract: A system to reduce noise includes a noise measurement device that provides a measure of noise associated with a digital input video signal. A noise reduction filter provides a noise-reduced digital output video signal corresponding to the luma and chroma of the digital input video signal. The noise reduction filter has a parameter that varies on a pixel basis for the component of the digital input video signal as a function of the measure of noise. The range and sensitivity of the noise reduction can be user programmable.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: March 31, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Karl Hertzian Renner, Shereef Shehata, Jason Meiners, Weider Peter Chang
  • Patent number: 7483037
    Abstract: A system which utilizes the processing capabilities of the graphics processing unit (GPU) in the graphics controller. Each frame of each video stream is decoded. After decoding the compressed image is separated into an image representing the luminance and an image representing the chroma. The chroma image is resampled as appropriate using the GPU to provide chroma values corresponding to each luminance value at the proper locations. The resampled chroma image and the luminance image are properly combined to produce a 4:4:4 image, preferably in the RGB color space, and provided to the frame buffer for final display. Each of these operations is done in real time for each frame of the video.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: January 27, 2009
    Assignee: Apple, Inc.
    Inventor: Sean Matthew Gies
  • Patent number: 7460180
    Abstract: A false-color suppression method corrects a pixel value of a pixel in a target location of a target frame while de-interlacing video data. The video data includes consecutive first, second and third fields, and the target frame corresponds to the third field. The method records an interpolation type of a first pixel with respect to the target location of a previous frame corresponding to the second field, and corrects the pixel value of the pixel in the target location of the target frame using a pixel value of a reference pixel if the interpolation type of the first pixel is an inter-field interpolation.
    Type: Grant
    Filed: August 24, 2005
    Date of Patent: December 2, 2008
    Assignee: Realtek Semiconductor Corp.
    Inventor: Po-Wei Chao
  • Patent number: 7453525
    Abstract: Systems and methods are provided for detecting motion within a composite video signal. A first chroma difference element compares an in-phase chroma component of the composite video signal to a delayed representation of the in-phase chroma component to produce a first chroma difference value for a given pixel. A second chroma difference element compares a quadrature chroma component of the composite video signal to a delayed representation of the quadrature chroma component to produce a second chroma difference value for the pixel. A parameter mapping component maps the first and second difference values to respective first and second motion parameters that indicates the degree of change in the chroma properties of the pixel. A parameter selector determines a composite motion parameter for the pixel from the first and second motion parameters.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: November 18, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Karl Renner, Weider Peter Chang, Ramesh M. Chandrasekaran
  • Patent number: 7443454
    Abstract: A method for treating inter-frame motion in a series of consecutive signal frames of a composite video signal includes the steps of, for an evaluation pixel position in each frame of a test frame-set including three successive signal frames: (a) determining whether there is at least a predetermined difference in chroma component or in luma component signals at the evaluation pixel; (b) if in step (a) there is not a predetermined difference in chroma component signals or in luma component signals, determining whether a first and third frame of the test frame-set are substantially identical; (c) determining whether at least a first predetermined number of the luma or chroma component signals in the test frame-set present at least one false color; and (d) determining whether at least a second predetermined number of high frequency luma component signals exist in the test frame-set.
    Type: Grant
    Filed: October 1, 2005
    Date of Patent: October 28, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Ramesh M. Chandrasekaran, Weider Peter Chang, Karl Renner
  • Patent number: 7430020
    Abstract: The present invention relates to separation of composite video signals, such as NTSC or PAL signals. In particular, it relates to accurate decoding of chrominance and luminance components, which may reduce so-called dot crawl and false color artifacts of at least some images.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: September 30, 2008
    Assignee: ESS Technology, Inc.
    Inventors: Jordan C. Cookman, Cai-Zhang Zhou
  • Patent number: 7420624
    Abstract: A three-dimensional video composite signal demodulating method and system capable of inhibiting pseudo-color noises. The system has a two-dimensional luminance and chroma signal separator, a three-dimensional luminance and chroma signal separator, a luminance weighting device, a chroma weighting device and a band pass filter. The method applies the two-dimensional luminance and chroma signal separator to obtain a two-dimensional luminance and chroma signal of a pixel, next the three-dimensional luminance and chroma signal separator to determine the pixel still or not according to a two-dimensional luminance and chroma signal change between a current frame and its previous and following frames with respect to the pixel, and gives appropriate weights to luminance and chroma signals generated by the two-dimensional and the three-dimensional luminance and chroma signal separators respectively, thereby respectively adding and obtaining separated luminance and chroma signals of the pixel.
    Type: Grant
    Filed: July 15, 2005
    Date of Patent: September 2, 2008
    Assignee: Sunplus Technology Co., Ltd.
    Inventors: Chih-Ming Lin, Wei-Hsin Gu
  • Patent number: 7408992
    Abstract: A method for removing MPEG-2 chroma upconversion artifacts in a video stream includes detecting a presence of artifacts in an incorrectly upsampled MPEG-2 video stream and removing the presence of artifacts resulting in an artifact free video stream.
    Type: Grant
    Filed: September 15, 2003
    Date of Patent: August 5, 2008
    Assignee: Silicon Image, Inc.
    Inventor: Dale R. Adams
  • Publication number: 20080122982
    Abstract: A method for reducing cross-luminance in an image display device includes receiving luminance signals of a plurality of frames in a composite video signal, determining a movement condition of a first frame of the plurality of frames according to the luminance signals, performing a filtering operation for the first frame according to the movement condition of the first frame, and outputting a result of the filtering operation.
    Type: Application
    Filed: May 8, 2007
    Publication date: May 29, 2008
    Inventors: Teng-Yi Lin, Pao-Jen Chen
  • Patent number: 7366238
    Abstract: A noise filter for a video processing system includes a block selector, a cost calculator, a cost table, a cost comparator, and a coefficient filter. The block selector is coupled to receive data from the quantization unit and selects blocks for additional filtering. The selected blocks are provided to the cost calculator determines a cost for each of the coefficients in the block using the cost table and the costs are summed. The cost comparator compares the total to a threshold, and filters the coefficients using the coefficient filter if the total is greater a preset threshold. The noise filter to the VLC unit then outputs the filter data.
    Type: Grant
    Filed: October 5, 2004
    Date of Patent: April 29, 2008
    Assignee: Micronas USA, Inc.
    Inventors: Weimin Zeng, Li Sha, Ping Zhu
  • Publication number: 20080074552
    Abstract: Disclosed are an image quality improvement device and method. The image quality improvement device includes a filter which separates an input video signal into a luminance signal and a chrominance signal, and a noise reduction unit which detects a motion in the input video signal by using the luminance signal separated by the filter, and thereby performing different filtering operations according to the existence of the motion.
    Type: Application
    Filed: September 4, 2007
    Publication date: March 27, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jae-han JUNG, Dong-soo KOO, Sung-hee KIM
  • Patent number: 7349033
    Abstract: Systems and methods are provided for correcting color phase error in a video decoder system. A demodulator system demodulates the composite input signal and the at least one delayed signal to produce sets of baseband chroma components based on a phase correction value. Color phase correction logic determines the phase correction value for the demodulator system based upon characteristics of the baseband chroma components associated with a series of at least two consecutive frames.
    Type: Grant
    Filed: May 23, 2005
    Date of Patent: March 25, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Weider Peter Chang, Ramesh M. Chandrasekaran
  • Patent number: 7310119
    Abstract: An adaptive circuit and method for separating luminance and chrominance components from a composite video signal by deriving three input lines from the composite video signal, determining whether any luminance similarity exists among the three input lines, and then selectively enabling a component filter based on any luminance similarity. If no luminance similarity exists among all three of the input lines, then a subtractive comb filter is enabled to maintain high vertical luminance resolution. If luminance similarity exists among all three of the input lines, then an additive comb filter is enabled. The additive comb filter performs three-line averaging when a high degree of similarity exists among all three consecutive input lines to minimize cross-chroma artifacts on lines that are similar.
    Type: Grant
    Filed: June 7, 2004
    Date of Patent: December 18, 2007
    Assignee: Cirrus Logic, Inc.
    Inventors: Rahul Singh, Daniel O. Gudmundson, James A. Antone