Including Comb Filter (e.g., Using Line, Field, Frame Delays) Patents (Class 348/665)
  • Patent number: 9490866
    Abstract: A passive cancellation network may include a transmit input having a configuration that passively receives a transmit signal from a transmitter that is to be wirelessly transmitted; a transmit output having a configuration that passively delivers the transmit signal after processing by the passive cancellation network; a receive input having a configuration that passively receives a receive signal that includes undesirable leakage from the transmit signal; a receive output having a configuration that passively delivers the receive signal after processing by the passive cancellation network; and a passive feed forward cancellation circuit that passively cancels at least a portion of the undesired leakage from the transmit signal in the receive signal in a feed forward manner.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: November 8, 2016
    Assignee: UNIVERSITY OF SOUTHERN CALIFORNIA
    Inventors: Ankush Goel, Behnam Analui, Hossein Hashemi
  • Patent number: 9270981
    Abstract: A rendering apparatus and method in a light field display may determine positions of eyes of a user, may determine a subpixel emitting a ray that enters the eyes, based on the positions of the eyes, among a plurality of subpixels forming a three-dimensional (3D) pixel, and may display a stereoscopic image on the light field display based on a pixel value of the determined subpixel.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: February 23, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ju Yong Park, Gee Young Sung, Dong Kyung Nam, Yun Tae Kim
  • Patent number: 9128885
    Abstract: A method and system that remove an unwanted signal and its harmonics from an input signal in a computationally efficient manner are disclosed. Embodiments include processing the FFT matrix to selectively zero-out rows of the matrix before multiplying the matrix with the Inverse FFT (IFFT) matrix. The resulting product (which is a sparse matrix) is then used to generate coefficients for a linear Finite Impulse Response (FIR) filter to process the input. The filtered output signal has the unwanted signal and its harmonics removed with minimal effect on a desired signal. The method produces a stable, physically realizable filter, requiring fewer computations than current methods.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: September 8, 2015
    Assignee: The MITRE Corporation
    Inventor: James L. Rasmussen
  • Patent number: 9031377
    Abstract: When reproducing a binocular 3D video, noises with random parallax are reduced by appropriately controlling the intensity of noise reduction. A reproduction apparatus includes: a noise processing circuit for applying noise processing to a video signal of a video content based on a given control signal; and a control section for receiving an output format identification signal which identifies an output format of the video content, and generating the control signal in accordance with the output format identification signal, the control section generating a control signal which causes the noise processing performed in the noise processing circuit to vary depending on whether an output format of the video content is a two-dimensional video or a three-dimensional video.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: May 12, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventor: Kazuhiko Kono
  • Patent number: 8891017
    Abstract: A video input section acquires a video signal formed of a plurality of frames. A frame separator separates the video signal acquired by the video input section on a frame basis and distributes the separated video signals. A plurality of parallel processors perform video processing in parallel on the separated video signals corresponding to the frames separated and distributed by the frame separator. A frame combiner combines the separated video signals on which the plurality of parallel processors have performed the video processing.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: November 18, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Kazuyoshi Kegasawa
  • Patent number: 8817194
    Abstract: In an interlaced image processing method for processing fields generated by interlacing and including a plurality of rows of scan signals, the method includes: performing horizontal line detection on a current field so as to determine which of the rows of the scan signals is a horizontal line; according to the horizontal line detection result of the current field and a horizontal line detection result of a previous field, adjusting position of the horizontal line in the current field so as to approach position of a corresponding horizontal line in the previous field; and according to the result of position adjustment, re-sampling the current field. An interlaced image processing apparatus for implementing the method is also disclosed.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: August 26, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Chi-Feng Wang, Chun-Hsing Hsieh
  • Patent number: 8754989
    Abstract: A signal processing apparatus and a control method thereof are provided. The signal processing apparatus includes: a comb filter which divides a luminance signal and a chrominance signal from an input video signal and outputs a luminance level of the luminance signal and a color level of the chrominance signal; an output unit which outputs one of the luminance level output by the comb filter and a blurred luminance level obtained by blurring the luminance level; and a controller which determines whether the luminance level output by the comb filter includes the color level, and controls the output unit to output the blurred luminance level if the color level is included in the luminance level, and output the luminance level if the color level is not included therein.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: June 17, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sang-min Hong
  • 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: 8619190
    Abstract: Film mode detection with bad edit detection used in de-interlacing video includes use of combing artifact detection in both 3-2 pull down detection and 2-2 pull down detection. Further, combing artifact detection uses only two field memories by accumulation of partial field statistics for comparisons.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: December 31, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Fan Zhai, Weider Peter Chang
  • 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: 8548066
    Abstract: A multi-directional comb filtering in a digital video decoder is provided. Some embodiments of the present invention provide for a method of filtering, using a multi-directional comb filter, pixel data from a sequence of fields of pixel data, wherein the fields of pixel data comprise a previous field, a current field and a next field, and wherein each of said fields includes a previous line, a current line, a next line.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: October 1, 2013
    Assignee: WZ Technology Inc.
    Inventors: Sheng De Jang, Hsiu Min Wong, Zu Jun Liang, Qing Yang
  • Publication number: 20130155328
    Abstract: A multi-directional comb filtering in a digital video decoder is provided. Some embodiments of the present invention provide for a method of filtering, using a multi-directional comb filter, pixel data from a sequence of fields of pixel data, wherein the fields of pixel data comprise a previous field, a current field and a next field, and wherein each of said fields includes a previous line, a current line, a next line.
    Type: Application
    Filed: January 25, 2013
    Publication date: June 20, 2013
    Applicant: Huaya Microelectronics, Inc.
    Inventor: Huaya Microelectronics, Inc.
  • Patent number: 8421926
    Abstract: A device for outputting a luminance signal is disclosed. The device includes a chrominance judgment unit, a field observation unit, and an output unit. The chrominance judgment unit and the field observation unit are used to determine whether a 3D luminance signal is affected. The output unit outputs a resultant luminance signal according to the determination results of the chrominance judgment unit and the field observation unit. According to the present invention, the resultant luminance signal can be accurately obtained by judging characteristics of the 3D luminance signal and a 3D chrominance signal even if a 3D comb filter is wrongly used in a motion condition.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: April 16, 2013
    Assignee: Silicon Integrated Systems Corp.
    Inventors: Albert Hua Tai, Feng Chi Wei, Heng Yi Liu
  • Patent number: 8306351
    Abstract: An apparatus and a method for filtering noise in an image signal are provided. The apparatus includes an analog-to-digital converter (ADC), a first filter, and a second filter. The ADC receives the image signal and converts the image signal into a digital signal. The first filter receives the digital signal and filters a first noise portion of the digital signal to generate a first signal. The second filter coupled to the first filter receives the first signal and filters a second noise portion of the first signal, wherein the first noise portion is a sampled-based impulse noise, and the second noise portion is a line-based impulse noise.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: November 6, 2012
    Assignee: Novatek Microelectronics Corp.
    Inventor: Hsin-I Lin
  • Patent number: 8279350
    Abstract: A method of composite decoding in which the input signal is converted into the frequency domain, and the symmetry of frequency components with respect to the subcarrier frequency is compared. The comparison is varied in dependence upon the frequency being processed. In this way, the separation can be adapted to suit known characteristics of different portions on the input spectrum. This is particularly useful for processing NTSC signals. The allocation of a particular component to chrominance may be biased in dependence upon a measure of the luminance information of the composite signal at a corresponding spatial frequency.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: October 2, 2012
    Assignee: Snell Limited
    Inventor: Martin Weston
  • Patent number: 8279347
    Abstract: A system of edge direction detection for comb filter includes a buffer, first and second filters, first and second oblique detectors, and a comparator. The buffer receives and stores a composite signal. The first filter performs filtering operation on the composite signal to produce a first filter signal. The second filter performs filtering operation on the composite signal to produce a second filter signal. The first oblique detector detects an oblique in the first filter signal to produce a first oblique indication signal and a first oblique direction signal and output a first minimum oblique difference. The second oblique detector detects an oblique in the second filter signal to produce a second oblique indication signal and a second oblique direction signal and output a second minimum oblique difference. The comparator compares the first and second oblique indication signals and the first and second oblique direction signals to produce edge information.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: October 2, 2012
    Assignee: Sunplus Technology Co., Ltd.
    Inventor: Tsung Han Chiang
  • Patent number: 8274607
    Abstract: An image processing apparatus is provided, including: a first image processing unit which converts an input image signal into a brightness signal and a chromaticity signal; and a second image processing unit which adjusts a bandwidth used to filter the chromaticity signal to correspond to a noise level of the image signal, and filters the chromaticity signal with the adjusted bandwidth to extract a chrominance signal.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: September 25, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Hye-joung Park
  • 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: 8260075
    Abstract: A two-dimensional filter arithmetic device comprises a picture memory, a line memory, a vertical filtering unit which includes nine first filter modules installed in parallel, a buffer for timing adjustments, and a horizontal filtering unit which includes four second filter modules installed in parallel. From the line memory, the pixel values of nine full pels per line are inputted in parallel to the vertical filtering unit, nine vertically-filtered values of half pels are generated and inputted to the horizontal filtering unit; thereby, four two-dimensionally-filtered values of half pels are generated.
    Type: Grant
    Filed: November 21, 2006
    Date of Patent: September 4, 2012
    Assignee: Panasonic Corporation
    Inventors: Akihiko Inoue, Tokuzo Kiyohara
  • Patent number: 8243202
    Abstract: Aspects of a method and system for a generalized multi-dimensional filter device are provided. A corresponding luma component and a corresponding chroma component of a sample of a composite video baseband signal for each of a plurality of filtering modes may be determined. A similarity level of the sample corresponding to each of the plurality of filtering modes may be determined. A corresponding coefficient for each of the plurality of filtering modes may be generated based on the determined similarity levels. A luma component and a chroma component of the sample of the composite video baseband signal may be generated based on the generated corresponding coefficients and the determined corresponding luma components and the determined corresponding chroma components for each of the plurality of filtering modes.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: August 14, 2012
    Assignee: Broadcom Corporation
    Inventors: Qiang Zhu, Wei Luo, Dongjian Wang, Chuan Chen, XiaoHong Di, Xavier Lacarelle, Wu Huang
  • Patent number: 8243093
    Abstract: Aspects of the present invention relate to creation, modification and implementation of dither pattern structures applied to an image to diminish contouring artifacts. Some aspects relate to dither pattern structures with pixel values in a first color channel pattern that are spatially dispersed from pixel values in a corresponding pattern in a second color channel. Some aspects relate to application. Some aspects relate to systems and apparatus for creation and application of these dither pattern structures comprising pixel values dispersed across color channels.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: August 14, 2012
    Assignee: Sharp Laboratories of America, Inc.
    Inventors: Xiao-Fan Feng, Scott J. Daly
  • 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: 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: 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: 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: 8189112
    Abstract: An embodiment has a C separating circuit which separates a carriage color signal and which outputs a reference, a lead, and a delayed composite video signals, a filter that extracts a high-frequency carriage color component with a significant variation in hue from the carriage color signal, a first calculation circuit which outputs a first luminance signal, a second calculation circuit which subtracts the carriage color signal from each of the reference, the preceding lead, and the delayed composite video signals and which derives a second luminance signal having an intermediate value, and a selection circuit which outputs the second luminance signal when the high-frequency carriage color component has a value larger than the reference value and which derives the first luminance signal when the high-frequency carriage color component has a value smaller than the reference value.
    Type: Grant
    Filed: April 24, 2007
    Date of Patent: May 29, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shigeki Kamimura, Yuichi Honda
  • 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: 8102472
    Abstract: An image processing apparatus includes: a cross-color detecting module for detecting whether at least one pixel carried by a composite signal has cross-color effect; and an image processing module, coupled to the cross-color detecting module, for performing a first predetermined operation or a second predetermined operation on the composite signal to generate a corresponding chrominance signal; wherein when the pixel has cross-color effect, the image processing module outputs a chrominance value of the pixel from the chrominance signal processed through the first predetermined operation, and when the pixel does not have cross-color effect, the image processing module outputs the chrominance value from the chrominance signal processed through the second predetermined operation.
    Type: Grant
    Filed: September 19, 2007
    Date of Patent: January 24, 2012
    Assignee: Realtek Semiconductor Corp.
    Inventor: Chia-Hao Hsiung
  • 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: 8072547
    Abstract: A comb filter system that utilizes host memory is disclosed. The comb filter system that utilizes host memory may include a comb filter. The comb filter system that utilizes host memory may include an allocated host memory. The comb filter system that utilizes host memory may include an interface in signal communication with the comb filter and allocated host memory.
    Type: Grant
    Filed: March 31, 2006
    Date of Patent: December 6, 2011
    Assignee: Conexant Systems, Inc.
    Inventors: John E. Welch, Michael A. Eskin, Lauren E. Linstad, Torry Steed
  • Publication number: 20110221966
    Abstract: The present invention discloses a super-resolution method for image display. The method comprises: receiving a low resolution image; dividing the low resolution image into a plurality of regions; finding high resolution patches in a pre-trained database; pasting the high resolution patches back to the plurality of regions by puzzle-form process or oblique-form process and computing the compatibility utilizing a two-dimensional hidden Markov model process; and generating a super-resolution image.
    Type: Application
    Filed: July 30, 2010
    Publication date: September 15, 2011
    Applicant: CHUNGHWA PICTURE TUBES, LTD.
    Inventors: Chen-Chiung HSIEH, Po-Han Chuan, Meng-Chao Kao
  • Patent number: 7929058
    Abstract: A digital video processing apparatus and a control method thereof are provided, and include a signal receiving part for receiving a digital video signal, a decoder for separating a luminance signal from the digital video signal, and a filtering part for filtering the luminance signal separated in the decoder to substantially remove an interference signal contained in the luminance signal. Thus, the digital video processing apparatus can filter out interference signals contained in a luminance signal of a digital video signal.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: April 19, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jae-cheol Kim
  • Patent number: 7924345
    Abstract: A method for processing video information may include calculating a polarity change count (PCC) for a plurality of pixel pairs selected from a plurality of pixels from different fields utilizing a plurality of difference polarity values associated with the plurality of pixel pairs. At least a portion of the plurality of pixels from different fields may be deinterlaced based on at least the calculated PCC. The plurality of difference polarity values may be calculated for the plurality of pixel pairs selected from the plurality of pixels from different fields. At least one difference in amplitude of at least one of the selected pixel pairs may be calculated for the calculating the plurality of difference polarity values. The plurality of pixels from different fields may comprise a plurality of adjacent pixels from a plurality of woven fields.
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: April 12, 2011
    Inventors: Alexander MacInnis, Chenhui Feng
  • Publication number: 20110075041
    Abstract: Aspects of a method and system for a generalized multi-dimensional filter device are provided. A corresponding luma component and a corresponding chroma component of a sample of a composite video baseband signal for each of a plurality of filtering modes may be determined. A similarity level of the sample corresponding to each of the plurality of filtering modes may be determined. A corresponding coefficient for each of the plurality of filtering modes may be generated based on the determined similarity levels. A luma component and a chroma component of the sample of the composite video baseband signal may be generated based on the generated corresponding coefficients and the determined corresponding luma components and the determined corresponding chroma components for each of the plurality of filtering modes.
    Type: Application
    Filed: September 30, 2009
    Publication date: March 31, 2011
    Inventors: Qiang Zhu, Wei Luo, Dongjian Wang, Chuan Chen, XiaoHong Di, Xavier Lacarelle, Wu Huang
  • Patent number: 7872689
    Abstract: A method of composite decoding in which the input signal is converted into the frequency domain, and the symmetry of frequency components with respect to the subcarrier frequency is compared. The comparison is varied in dependence upon the frequency being processed. In this way, the separation can be adapted to suit known characteristics of different portions on the input spectrum. This is particularly useful for processing NTSC signals. The allocation of a particular component to chrominance may be biased in dependence upon a measure of the luminance information of the composite signal at a corresponding spatial frequency.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: January 18, 2011
    Assignee: Snell Limited
    Inventor: Martin Weston
  • Publication number: 20100225821
    Abstract: An image processing apparatus is provided, including: a first image processing unit which converts an input image signal into a brightness signal and a chromaticity signal; and a second image processing unit which adjusts a bandwidth used to filter the chromaticity signal to correspond to a noise level of the image signal, and filters the chromaticity signal with the adjusted bandwidth to extract a chrominance signal.
    Type: Application
    Filed: July 30, 2009
    Publication date: September 9, 2010
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Hye-joung Park
  • Patent number: 7773157
    Abstract: An adaptive digital video signal processing apparatus and method for Y/C separation. In the video signal processing apparatus, an adaptive 2D BPF carries out Y/C separation through comb filtering and bandpass filtering selected according to local characteristics of an image (e.g., based on the direction in which an edge in the image extends in vertical and horizontal directions. The adaptive 2D BPF performs 2D bandpass filtering in general case. The 2D BPF adaptively executes a series of selections of the various filtering operations in a continuous manner.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: August 10, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-Cheol Park, Hyung-Jun Lim, Jae-Hong Park, Kyoung-Mook Lim, Heo-Jin Byeon, Eui-Jin Kwon
  • Publication number: 20100165209
    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: Application
    Filed: December 2, 2009
    Publication date: July 1, 2010
    Applicant: STMicroelectronics Asia Pacific PTE Ltd
    Inventor: Patricia Chiang Wei Yin
  • 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: 7728910
    Abstract: The invention relates to a 2D YC separation device and YC separation system for separating a composite signal into a luma signal (Y) and a chroma signal (C). Firstly, the 2D YC separation device utilizes a low-pass filter to separate the composite signal into a low-frequency composite signal and a high-frequency composite signal. The low-frequency composite signal is a low-frequency luma signal. A 2D comb filter is utilized to separate the high-frequency composite signal into a high-frequency luma signal and the chroma signal. The luma signal is equal to the low-frequency luma signal plus the high-frequency luma signal. Therefore, the 2D YC separation device of the present invention can perfectly separate the composite signal so as to obtain a better luma signal and chroma signal. The YC separation system of the present invention further comprises a 3D YC separation device and a motion detection device, so as to obtain a precise luma signal and chroma signal.
    Type: Grant
    Filed: May 23, 2006
    Date of Patent: June 1, 2010
    Assignee: Himax Technologies, Inc.
    Inventor: Fang-Chen Chang
  • 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: 7663702
    Abstract: A digital video signal processing apparatus and method for adaptive spatio-temporal Y/C separation in multiple directions. In the digital video signal processing apparatus, an adaptive three-dimensional band pass filter (3D BPF) performs Y/C separation using local comb filtering/1D band pass filtering when the edge direction is fixed vertically/horizontally according to spatio-temporal local characteristics of an image using spatio-temporal filters. When the edge direction is not fixed horizontally/vertically, the 3D BPF performs 2D band pass filtering in all directions. Thus, the 3D BPF continuously carries out comb filtering, 1D band pass filtering and 2D band pass filtering according to the spatio-temporal local characteristics of the image.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: February 16, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-cheol Park, Kyoung-mook Lim, Hyung-jun Lim, Seh-woong Jeong, Jae-hong Park, Heo-jin Byeon
  • Patent number: 7659944
    Abstract: A digital video signal processing apparatus and method for field-based adaptive Y/C separation includes an adaptive 3D BPF performing Y/C separation according to local comb filtering/1D band pass filtering when the edge direction is fixed vertically/horizontally in response to spatio-temporal local characteristics of an image using spatio-temporal filters. When the edge direction is not fixed horizontally or vertically, the 3D BPF performs 2D/3D band pass filtering in all directions. The 3D BPF adaptively and continuously carries out comb filtering, 1D band pass filtering and 2D/3D band pass filtering in response to the spatio-temporal local characteristics of the image.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: February 9, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-cheol Park, Hyung-jun Lim, Jae-hong Park, Kyoung-mook Lim, Heo-jin Byeon, Dong-suk Shin
  • Publication number: 20090322954
    Abstract: A narrower bandwidth 3D comb filter is used to render a still motion portion of a video frame if motion in a moving portion of the frame exceeds a threshold, and otherwise a wider bandwidth 3D comb filter is used to render the still motion portion.
    Type: Application
    Filed: June 27, 2008
    Publication date: December 31, 2009
    Inventors: Louis Le, Tuan Pham
  • Publication number: 20090303390
    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: Application
    Filed: June 9, 2008
    Publication date: December 10, 2009
    Applicant: Himax Media Solutions, Inc.
    Inventors: Ling-Hsiu Huang, Shing-Chia Chen
  • Publication number: 20090295999
    Abstract: A system of edge direction detection for comb filter includes a buffer, first and second filters, first and second oblique detectors, and a comparator. The buffer receives and stores a composite signal. The first filter performs filtering operation on the composite signal to produce a first filter signal. The second filter performs filtering operation on the composite signal to produce a second filter signal. The first oblique detector detects an oblique in the first filter signal to produce a first oblique indication signal and a first oblique direction signal and output a first minimum oblique difference. The second oblique detector detects an oblique in the second filter signal to produce a second oblique indication signal and a second oblique direction signal and output a second minimum oblique difference. The comparator compares the first and second oblique indication signals and the first and second oblique direction signals to produce edge information.
    Type: Application
    Filed: May 12, 2009
    Publication date: December 3, 2009
    Applicant: Sunplus Technology Co., Ltd.
    Inventor: Tsung Han Chiang
  • Patent number: 7605870
    Abstract: A digital video signal processing apparatus and method for frame-based adaptive spatio-temporal Y/C separation. In the digital video signal processing apparatus, an adaptive three-dimensional bandpass filter (3D BPF) performs Y/C separation using local comb filtering/1D band pass filtering/frame comb filtering when the edge direction is fixed vertically/horizontally/temporally according to spatio-temporal local characteristics of an image using spatio-temporal filters. When the edge direction is not fixed horizontally/vertically/temporally, the 3D BPF performs 2D or 3D band pass filtering in all directions. Thus, the 3D BPF continuously carries out comb filtering, 1D band pass filtering, frame comb filtering and 2D/3D band pass filtering according to the spatio-temporal local characteristic of the image.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: October 20, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-cheol Park, Hyung-jun Lim, Jae-hong Park, Kyoung-mook Lim, Heo-jin Byeon, Dong-suk Shin
  • Patent number: 7595842
    Abstract: A system and method for determining whether to process a signal using three-dimensional comb filtering. Various aspects of the present invention may comprise method steps and system components that generate an inter-frame chroma signal. Various aspects may generate a filtered inter-frame chroma signal by removing a band of frequency components from the inter-frame chroma signal that generally corresponds to chroma signal components. Various aspects may analyze the filtered inter-frame chroma signal to determine whether three-dimensional comb filtering may be appropriate. Various aspects may comprise method steps and components that generate inter-frame and intra-frame luma signals. Various aspects may generate filtered inter-frame and intra-frame luma signals by removing frequency components from the inter-frame and intra-frame luma signals, respectively, that fall outside a frequency band near the chroma sub-carrier frequency.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: September 29, 2009
    Assignee: Broadcom Corporation
    Inventors: Alexander G. MacInnis, Sheng Zhong
  • Patent number: 7545442
    Abstract: The present invention uses a 2D comb filter 20 to output a 2D chrominance signal C2d by comparing the current scan-line signals with the signals before and after the current scan-line signals. A 3D chrominance signal C3d is then acquired by directly subtracting two adjacent 2D image signals and then dividing by 2 to get an approximate chrominance signal C3d of the two 2D images. Ratio mixing is performed on the 2D chrominance signal C2d and the 3D chrominance signal C3d to output a near-actual chrominance signal. A chrominance variation value can be acquired by comparing the chrominance signals of the two adjacent images. Finally, an actual luminance signal of the current scan-line is separated by deducting the near-actual chrominance signal from the signals of the current scan-line to restore the luminance signal.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: June 9, 2009
    Assignee: VXIS Technology Corp.
    Inventors: Yuan-Hao Huang, Jen-Yao Ho
  • Patent number: 7538823
    Abstract: A method of separating a chroma data component from a video data stream includes determining a phase relationship between a color burst in digital video data samples of a composite video signal and a local clock signal which processes the digital video data samples. In response to determining the phase relationship, interpolation filtering is performed on the digital video data samples corresponding to first and second display lines to generate phase aligned video data samples. Adaptive filtering is then performed utilizing the phase aligned video data samples corresponding to the first and second display lines to separate the chroma component from the digital video data samples corresponding to the first display line.
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: May 26, 2009
    Assignee: Cirrus Logic, Inc.
    Inventors: Rahul Singh, James Antone, John Laurence Melanson, Daniel O. Gudmundson