Title :
Coefficient sign bit compression in video coding
Author :
Koyama, Jumpei ; Yamori, Akihiro ; Kazui, Kimihiko ; Shimada, Satoshi ; Nakagawa, Akira
Author_Institution :
Media Process. Syst. Labs., Fujitsu Labs. Ltd., Kawasaki, Japan
Abstract :
We propose a novel compression technique on signs of DCT coefficients. The proposed technique utilizes a high correlation among pixels at boundaries of a current block and those of neighboring blocks and estimates the original signs. It encodes the difference between the original coefficient signs and the estimated signs. We also propose a speeding up technique for the estimation, utilizing concepts of Gray code and transform matrix decomposition. Compared to JM16.2, the proposed technique reduces 10% bitrate in sign bits of DCT coefficients and achieves 1% BD-bitrate reduction in total bitstream. With the speeding up technique, complexities increase only 8% and 5% on an encoder and a decoder side, respectively.
Keywords :
Gray codes; data compression; matrix decomposition; video codecs; video coding; BD-bitrate reduction; DCT coefficients; Gray code; JM16.2; coefficient sign bit compression; coefficient signs; compression technique; decoder side; encoder side; estimation technique; transform matrix decomposition; video coding; Correlation; Decoding; Discrete cosine transforms; Encoding; Estimation; Reflective binary codes; Discrete Cosine Transform (DCT); Gray code; MPEG-4 AVC/H.264; arithmetic coding; coefficient sign; matrix decomposition; video compression;
Conference_Titel :
Picture Coding Symposium (PCS), 2012
Conference_Location :
Krakow
Print_ISBN :
978-1-4577-2047-5
Electronic_ISBN :
978-1-4577-2048-2
DOI :
10.1109/PCS.2012.6213370