Title :
Trellis-based R-D optimal quantization in H.263+
Author :
Wen, Jiangtao ; Luttrell, Max ; Villasenor, John
Author_Institution :
PacketVideo Corp., San Diego, CA, USA
fDate :
8/1/2000 12:00:00 AM
Abstract :
We describe a trellis-based algorithm which enables R-D optimum quantization decisions in the H.263+ video coding standard. The algorithm allows the quantization decisions for all coefficients in a block to be made jointly, and experiments conducted using H.263+ for video coding rates of 40-50 kbps show an average improvement of 3.5% in bitrate relative to implementations which follow the International Telecommunications Union (ITU) Test Model specifications in making quantization decisions
Keywords :
code standards; discrete cosine transforms; dynamic programming; optimisation; quantisation (signal); rate distortion theory; transform coding; video coding; 40 to 50 kbit/s; DCT; H.263+ video coding standard; ITU Test Model specifications; R-D optimum quantization decisions; rate-distortion optimization; trellis-based algorithm; Bit rate; Cost function; Discrete cosine transforms; ISO standards; Image coding; Quantization; Rate-distortion; Testing; Video coding; Viterbi algorithm;
Journal_Title :
Image Processing, IEEE Transactions on
