Title :
A modified H.263 algorithm using bit allocation buffer control algorithm
Author :
Ng, K.T. ; Chan, S.C. ; Ng, T.S.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong
Abstract :
Buffer control is an important problem in very low bit-rate video coding. Previously the authors had proposed a new buffer control algorithm for motion-compensated hybrid DPCM/DCT coding. The algorithm is based on the use of a bit allocation algorithm to determine the quantization scale factors in such a coder to meet a given target bit rate. Simulation results showed that, using the proposed algorithm, the H.261 coder can achieve a higher PSNR and better visual quality than the coder using a traditional buffer control algorithm. In this paper, we apply this buffer control algorithm to a modified version of the H.263 algorithm for very low bit-rate video coding. Comparing the performance of the modified H.263 codec with the TMN5 model also shows that better visual quality can be obtained at comparable PSNR values
Keywords :
data compression; motion compensation; video codecs; video coding; H.263 codec; bit allocation buffer control algorithm; modified H.263 algorithm; motion-compensated hybrid DPCM/DCT coding; quantization scale factors; very low bit-rate video coding; Bit rate; Codecs; Discrete cosine transforms; Image coding; Motion control; PSNR; Quantization; Redundancy; Video coding; Video compression;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.622137