Title :
An improved Exp-Golomb codes for efficient DCT coefficients coding
Author :
Gao, Wei ; Li, Hua ; Liu, Kaihua
Author_Institution :
Coll. of Electron. & Inf. Eng., Tianjin Univ.
Abstract :
Exp-Golomb codes are adopted by current image and video standards to perform entropy coding. But Exp-Golomb codes are sensitive to source parameters such as quantizer step size and pdf shape parameter. Under variable source parameters, the coding efficiency of Exp-Golomb codes falls drastically, as poor as 30% and even worse. The author presents a new class of codes, hybrid Golomb codes, based on Exp-Golomb codes and Golomb-Rice codes, which integrates the properties of two classes of codes and thus are more robust than Exp-Golomb codes when source parameters change frequently. In particular when quantizer step size is changing, the coding efficiency of hybrid Golomb codes is higher 10% than that of Exp-Golomb codes
Keywords :
discrete cosine transforms; entropy codes; video coding; DCT coefficients coding; Exp-Golomb codes; Golomb-Rice codes; entropy coding; hybrid Golomb codes; image standards; pdf shape parameter; quantizer step size; variable source parameters; video standards; Code standards; Degradation; Discrete cosine transforms; Educational institutions; Entropy coding; Image coding; Robustness; Shape; Video coding; Video compression;
Conference_Titel :
Electrical and Computer Engineering, 2005. Canadian Conference on
Conference_Location :
Saskatoon, Sask.
Print_ISBN :
0-7803-8885-2
DOI :
10.1109/CCECE.2005.1557386
