Patents by Inventor Jechang Jeong

Jechang Jeong has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10015484
    Abstract: The present disclosure relates to an adaptive scan apparatus and a method for scanning thereof. The adaptive scan apparatus includes a zero coefficient counter and a scan pattern updater. The scan pattern updater is configured to generate a zero counter corresponding to a prediction mode of a neighboring block of a current block and to update the zero counter corresponding to a position where a coefficient value of the current block is 0 for transformed and quantized data. And the scan pattern updater is configured to update a scan pattern by sequentially arranging generated zero counters updated for the current block from a position of a small value to a position of a large value.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: July 3, 2018
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Kunho Yoo, Tae Young Jung, Jechang Jeong
  • Patent number: 9729872
    Abstract: A video encoding apparatus encodes intra-prediction mode information of the current block by excluding information on overlapping or unnecessary intra-prediction modes from a candidate mode group and/or based on whether predicted values of intra-prediction modes of at least a preset number of subblocks are matched with actual intra-prediction modes.
    Type: Grant
    Filed: November 25, 2011
    Date of Patent: August 8, 2017
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Kibaek Kim, Jechang Jeong
  • Patent number: 9521427
    Abstract: A method and apparatus for encoding and decoding an image in a spatial domain for noise components are provided. The method and apparatus generate a prediction block by predicting a current block, generate a residual block by subtracting the prediction block from the current block, decide whether the number of noise components of the residual block is in a predetermined range, determine a coding domain, when a determined coding domain is a frequency domain, transform quantize the residual block, when the determined coding domain is a spatial domain, quantize the residual block and encode information on the determined coding domain and a generated quantized block, or quantize the noise components and encode and decode information on quantized noise components, and a number and locations of the noise components.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: December 13, 2016
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Kibaek Kim, Jechang Jeong
  • Patent number: 9510017
    Abstract: A method performed by a video encoding apparatus, includes: generating a predicted block by predicting a current block to be encoded; generating a residual block by subtracting the predicted block from the current block; encoding, into a bitstream, coding domain information indicating whether the residual block is encoded by a frequency domain coding or by a spatial domain coding; and encoding the residual block into the bitstream. Herein, the encoding of the residual block comprises: when the residual block is encoded by the frequency domain coding, transforming from a spatial domain into a frequency domain and quantizing the residual block, and encoding the transformed and quantized residual block; and when the residual block is encoded by the spatial domain coding, skipping transform for the residual block and quantizing the residual block, and encoding the quantized residual block.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: November 29, 2016
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Kibaek Kim, Jechang Jeong
  • Patent number: 9503725
    Abstract: A video encoding apparatus, a video decoding apparatus and video decoding method are provided. The video decoding apparatus includes: a decoding unit receiving encoded data and reconstruct an intra prediction mode by decoding a bitstream of the encoded data; a dequantization unit dequantizing the quantized transformed residual block to reconstruct a transformed residual block; an inverse transform unit inversely transforming the transformed residual block to reconstruct a residual block; a prediction unit generating a predicted block by selectively using one of pixels of a neighboring block adjacent to a current block and a reference pixel generated by filtering the pixels of the neighboring block according to the intra prediction mode; and an addition unit adding the reconstructed residual block and the predicted block to reconstruct the current block.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: November 22, 2016
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Kibaek Kim, Jechang Jeong
  • Patent number: 9497454
    Abstract: A video encoding apparatus, a decoding apparatus and method thereof by using feature vectors of at least one neighboring block are provided. In the video encoding apparatus, the decoding apparatus and the method, the feature vector is extracted from pixels of at least one neighboring block, and an optimal prediction mode represented by the feature vector is extracted with reference to a preset feature vector distribution of image blocks. The extracted optimal prediction mode is decided as a most probable mode (MPM) or an intra mode of a current block, and the current block is intra-predicted and encoded or decoded by using pixels of the at least one neighboring block adjacent to the current block.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: November 15, 2016
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Hyuk Lee, Jechang Jeong
  • Patent number: 9473777
    Abstract: The present disclosure provides a video encoding apparatus and encoding method thereof, video decoding apparatus and decoding method thereof, and directional intra-prediction method to be used therefor. The video encoding apparatus includes a main mode search unit for searching for main mode for a current block from among directional intra-prediction modes; a sub mode search unit for searching for sub modes formed by inclining indicated orientation of found main mode by main mode search unit by a predetermined offset in both clockwise and counterclockwise directions; a predicted block generator for generating predicted block of the current block from neighboring blocks of the current block based on found main mode by the main mode search unit and found sub modes by the sub mode search unit; a differentiator for calculating differential between the current block and the predicted block; and an encoder for encoding calculated differential by the differentiator.
    Type: Grant
    Filed: November 25, 2010
    Date of Patent: October 18, 2016
    Assignee: SK TELECOM CO., LTD.
    Inventors: Sunyeon Kim, Jeongyeon Lim, Gyumin Lee, Jaehoon Choi, Jechang Jeong
  • Publication number: 20160088314
    Abstract: A method performed by a video encoding apparatus, includes: generating a predicted block by predicting a current block to be encoded; generating a residual block by subtracting the predicted block from the current block; encoding, into a bitstream, coding domain information indicating whether the residual block is encoded by a frequency domain coding or by a spatial domain coding; and encoding the residual block into the bitstream. Herein, the encoding of the residual block comprises: when the residual block is encoded by the frequency domain coding, transforming from a spatial domain into a frequency domain and quantizing the residual block, and encoding the transformed and quantized residual block; and when the residual block is encoded by the spatial domain coding, skipping transform for the residual block and quantizing the residual block, and encoding the quantized residual block.
    Type: Application
    Filed: December 4, 2015
    Publication date: March 24, 2016
    Inventors: Jinhan SONG, Jeongyeon LIM, Kibaek KIM, Jechang JEONG
  • Publication number: 20130301714
    Abstract: A video encoding apparatus, a video decoding apparatus and video decoding method are provided. The video decoding apparatus includes: a decoding unit receiving encoded data and reconstruct an intra prediction mode by decoding a bitstream of the encoded data; a dequantization unit dequantizing the quantized transformed residual block to reconstruct a transformed residual block; an inverse transform unit inversely transforming the transformed residual block to reconstruct a residual block; a prediction unit generating a predicted block by selectively using one of pixels of a neighboring block adjacent to a current block and a reference pixel generated by filtering the pixels of the neighboring block according to the intra prediction mode; and an addition unit adding the reconstructed residual block and the predicted block to reconstruct the current block.
    Type: Application
    Filed: November 4, 2011
    Publication date: November 14, 2013
    Applicant: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Kibaek Kim, Jechang Jeong
  • Publication number: 20130294507
    Abstract: The present disclosure relates to an adaptive scan apparatus and a method for scanning thereof. The adaptive scan apparatus includes a zero coefficient counter and a scan pattern updater. The scan pattern updater is configured to generate a zero counter corresponding to a prediction mode of a neighboring block of a current block and to update the zero counter corresponding to a position where a coefficient value of the current block is 0 for transformed and quantized data. And the scan pattern updater is configured to update a scan pattern by sequentially arranging generated zero counters updated for the current block from a position of a small value to a position of a large value.
    Type: Application
    Filed: July 1, 2013
    Publication date: November 7, 2013
    Inventors: Jinhan SONG, Jeongyeon LIM, Kunho YOO, Tae Young JUNG, Jechang JEONG
  • Publication number: 20130287094
    Abstract: A video encoding apparatus, a decoding apparatus and method thereof by using feature vectors of at least one neighboring block are provided. In the video encoding apparatus, the decoding apparatus and the method, the feature vector is extracted from pixels of at least one neighboring block, and an optimal prediction mode represented by the feature vector is extracted with reference to a preset feature vector distribution of image blocks. The extracted optimal prediction mode is decided as a most probable mode (MPM) or an intra mode of a current block, and the current block is intra-predicted and encoded or decoded by using pixels of the at least one neighboring block adjacent to the current block.
    Type: Application
    Filed: June 27, 2013
    Publication date: October 31, 2013
    Inventors: Jinhan SONG, Jeongyeon Lim, Hyuk Lee, Jechang Jeong
  • Publication number: 20130259126
    Abstract: In a video encoding and/or decoding apparatus and/or method, a video encoder partitions a reference image predicted block-wise with at least a filter into blocks in at least one layer, sets a partitioning flag to indicate whether each of the partitioned blocks is subdividable into sub-blocks, sets a filter type to indicate which filter was used for interpolating each of the blocks or sub-blocks, and quadtree-encodes the partitioning flag and the filter type together with the corresponding block or sub-block to generate a quadtree-encoded bitstream. A video decoder reads the partitioning flags and the filter types from the quadtree-encoded bitstream to reconstruct the partitioning flags and the filter types for the corresponding blocks or sub-blocks, generates the blocks or sub-blocks based on the corresponding partitioning flags, and interpolates the generated blocks or sub-blocks on the basis of the corresponding filter types to reconstruct the reference image.
    Type: Application
    Filed: October 26, 2011
    Publication date: October 3, 2013
    Applicant: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Tae Young Jung, Tae Ho Kim, Jechang Jeong
  • Publication number: 20130259133
    Abstract: A method and apparatus for encoding and decoding an image in a spatial domain for noise components are provided. The method and apparatus generate a prediction block by predicting a current block, generate a residual block by subtracting the prediction block from the current block, decide whether the number of noise components of the residual block is in a predetermined range, determine a coding domain, when a determined coding domain is a frequency domain, transform quantize the residual block, when the determined coding domain is a spatial domain, quantize the residual block and encode information on the determined coding domain and a generated quantized block, or quantize the noise components and encode and decode information on quantized noise components, and a number and locations of the noise components.
    Type: Application
    Filed: June 5, 2013
    Publication date: October 3, 2013
    Inventors: Jinhan Song, Jeongyeon Lim, Kibaek Kim, Jechang Jeong
  • Publication number: 20130259128
    Abstract: A video encoding apparatus encodes intra-prediction mode information of the current block by excluding information on overlapping or unnecessary intra-prediction modes from a candidate mode group and/or based on whether predicted values of intra-prediction modes of at least a preset number of subblocks are matched with actual intra-prediction modes.
    Type: Application
    Filed: November 25, 2011
    Publication date: October 3, 2013
    Applicant: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Kibaek Kim, Jechang Jeong
  • Publication number: 20130230105
    Abstract: An intra-prediction encoding/decoding apparatus and method is provided that omits transmission of prediction mode information using characteristics of reference pixels. The present disclosure provides an intra-prediction encoding apparatus and method for omitting transmission of additional information of a predicted mode of the current block through the use of characteristics of reference pixels adjacent to a current block and thereby reducing overhead when a bitstream is generated, and improving the efficiency of encoding and decoding an image while maintaining the accuracy of intra-predictions.
    Type: Application
    Filed: September 7, 2011
    Publication date: September 5, 2013
    Applicant: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Tae Young Jung, Hyuk Lee, Jechang Jeong
  • Publication number: 20130230104
    Abstract: A video encoding/decoding method and apparatus select a prediction mode set based on neighboring pixels and, in some embodiments, obviate the need to encode additional information for selecting a prediction mode set and thereby improve the performance of compression.
    Type: Application
    Filed: September 7, 2011
    Publication date: September 5, 2013
    Applicant: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Tae Young Jung, Yong Hoon Kim, Jechang Jeong
  • Publication number: 20120320975
    Abstract: The present disclosure provides a video encoding apparatus and encoding method thereof, video decoding apparatus and decoding method thereof, and directional intra-prediction method to be used therefor. The video encoding apparatus includes a main mode search unit for searching for main mode for a current block from among directional intra-prediction modes; a sub mode search unit for searching for sub modes formed by inclining indicated orientation of found main mode by main mode search unit by a predetermined offset in both clockwise and counterclockwise directions; a predicted block generator for generating predicted block of the current block from neighboring blocks of the current block based on found main mode by the main mode search unit and found sub modes by the sub mode search unit; a differentiator for calculating differential between the current block and the predicted block; and an encoder for encoding calculated differential by the differentiator.
    Type: Application
    Filed: November 25, 2010
    Publication date: December 20, 2012
    Applicant: SK TELECOM CO., LTD.
    Inventors: Sunyeon Kim, Jeongyeon Lim, Gyumin Lee, Jaehoon Choi, Jechang Jeong
  • Publication number: 20120300848
    Abstract: The present disclosure provides an apparatus and a method for generating an inter-prediction frame, and an apparatus and a method for interpolating a reference frame used therein. The apparatus for interpolating the reference frame includes a directivity determiner for determining directivity of a quarter pixel located at the intersection of a left diagonal line and a right diagonal line of a half-pixel unit based on surrounding pixels of the quarter pixel; and an interpolation processor for interpolating a pixel value for the quarter pixel by differently applying a linear interpolation method depending on the directivity determined by the directivity determiner.
    Type: Application
    Filed: November 25, 2010
    Publication date: November 29, 2012
    Applicant: SK TELECOM CO., LTD.
    Inventors: Sunyeon Kim, Jeongyeon Lim, Gyumin Lee, Jaehoon Choi, Jechang Jeong, Kangjun Lee
  • Patent number: RE40980
    Abstract: An adaptive variable-length coding/decoding method performs an optimal variable-length coding and decoding depending on an intra mode/inter mode condition, quantization step size and a current zigzag scanning position, such that a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to statistical characteristics of the run level data are set. One of the variable-length coding tables is selected according to mode, quantization step size and scanning position, and the orthogonal transform coefficients according to the selected variable-length coding table are variable-length-coded.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: November 17, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae Moon Jo, JeChang Jeong
  • Patent number: RE41124
    Abstract: An adaptive variable-length coding/decoding method performs an optimal variable-length coding and decoding depending on an intra mode/inter mode condition, quantization step size and a current zigzag scanning position, such that a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to statistical characteristics of the run level data are set. One of the variable-length coding tables is selected according to mode, quantization step size and scanning position, and the orthogonal transform coefficients according to the selected variable-length coding table are variable-length-coded.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: February 16, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae Moon Jo, Jechang Jeong