Patents by Inventor Yongjo AHN

Yongjo AHN 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).

  • Publication number: 20190253707
    Abstract: The present invention relates to an interpolation filter, and method and apparatus, from among video coding schemes, for encoding and decoding by selectively utilizing the interpolation filter. The method includes the steps of: acquiring spatially and temporally adjacent reference samples; determining whether to an adaptive apply interpolation filter acquired from a bitstream; and, if whether to apply the adaptive interpolation filter is indicated to be true, then carrying out interpolation of the reference samples by utilizing data for the acquired reference samples and interpolation filter.
    Type: Application
    Filed: October 20, 2016
    Publication date: August 15, 2019
    Inventors: Hochan RYU, Yongjo AHN
  • Publication number: 20190191158
    Abstract: The present invention relates to a method and device for transmitting block division information for efficient image coding in a video compression technique for a high-definition security camera. To this end, the present invention obtains block division information from a bitstream, determines the division form of an image by computing and predicting omitted information if there is omitted information in the obtained information, and performs video decoding in the unit of a divided block.
    Type: Application
    Filed: February 21, 2019
    Publication date: June 20, 2019
    Inventors: Donggyu SIM, Yongjo AHN, Seanae PARK
  • Publication number: 20190082179
    Abstract: The present invention relates to a method and apparatus for performing encoding and decoding using a variably-sized quantization coefficient group, in quantization coefficient group encoding and decoding of video compression technology.
    Type: Application
    Filed: March 9, 2017
    Publication date: March 14, 2019
    Inventors: Yongjo AHN, Donggyu SIM, Hochan RYU, Seanae PARK, Woong LIM
  • Publication number: 20180366055
    Abstract: A method of compressing image data in a display apparatus in a unit of block including a plurality of pixels includes generating a residual signal by predicting image data of a plurality of second blocks disposed in a second horizontal line using image data of a plurality of first blocks disposed in a first horizontal line, where the second horizontal line is disposed under the first horizontal line, determining whether operating discrete cosine transform (“DCT”) to the residual signal or not based on an input image, compressing the image data of the second blocks and determining compressibility of image data of a plurality of third blocks disposed in a third horizontal line disposed under the second horizontal line based on compressibility of the image data of the second blocks.
    Type: Application
    Filed: March 29, 2018
    Publication date: December 20, 2018
  • Patent number: 9838713
    Abstract: A method for fast transform coding in image compression is provided. The method includes performing prediction with respect to a current block, calculating a prediction error with respect to the current block, performing transform and quantization with respect to the current block, performing dequantization and inverse transform with respect to a transform coefficient generated through the transform and quantization, generating a reconstruction signal by summing a prediction signal generated in the performing of the prediction and a residual signal generated in the performing of the dequantization and inverse transform, calculating a rate-distortion (RD) cost related to the reconstruction signal, determining whether a size of the current block is a minimum block size, partitioning the current block into a plurality of sub-blocks, and performing transform coding with respect to the sub-blocks in response to determination that the size of the current block is not the minimum block size.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: December 5, 2017
    Assignee: Kwangwoon University-Academic Collaboration Foundation
    Inventors: Donggyu Sim, Yongjo Ahn
  • Publication number: 20160373768
    Abstract: The present invention enables efficient decoding by using DR mapping information between a base layer and an enhancement layer in various manners in an HDR decoder considering backward compatibility.
    Type: Application
    Filed: June 15, 2016
    Publication date: December 22, 2016
    Inventors: Donggyu SIM, Seanae PARK, Yongjo AHN, Jonghyun MA, Jeongyun LIM