US 11,871,036 B2
Apparatus and method for compressing JPEG images
Suah Kim, Seoul (KR)
Assigned to Korea University Research and Business Foundation, Seoul (KR)
Filed by Korea University Research and Business Foundation, Seoul (KR)
Filed on Jun. 18, 2021, as Appl. No. 17/351,524.
Claims priority of application No. 10-2020-0124272 (KR), filed on Sep. 24, 2020; and application No. 10-2020-0168530 (KR), filed on Dec. 4, 2020.
Prior Publication US 2022/0094988 A1, Mar. 24, 2022
Int. Cl. H04N 19/625 (2014.01); H04N 19/124 (2014.01); H04N 19/182 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/625 (2014.11) [H04N 19/124 (2014.11); H04N 19/176 (2014.11); H04N 19/182 (2014.11)] 8 Claims
OG exemplary drawing
 
1. An apparatus for compressing Joint Photographic Experts Group (JPEG) images, comprising:
a decoding unit to decode a pixel at a specific block location (x, y) to generate a quantized DC coefficient, predict an estimated quantized DC coefficient of a target block to be decoded using quantized AC coefficients of the target block and a pixel value of a decoded block adjacent to the target block, and calculate an estimation error value which is the quantized DC coefficient minus the estimated quantized DC coefficient; and
an encoding unit to encode the estimation error value by Huffman coding.