Title :
On the use of DCT based activity measure in MPEG-2 rate control model TM5
Author_Institution :
DSP & Multimedia Group, Tata Elxsi Ltd., Bangalore, India
Abstract :
In this paper, a novel modification in the step 3 of the rate control test Model 5 (TM5) of MPEG-2 video encoder is proposed. TM5 uses variance based activity measure to adapt the quantization parameter for each macroblock. It is found that if DCT coefficients are used instead of variance, the PSNR quality of the reconstructed image improves by 0.5 to 2 dB. In addition the computational complexity of the new approach is significantly lesser than that of TM5.
Keywords :
computational complexity; discrete cosine transforms; image reconstruction; transform coding; video coding; DCT; MPEG-2 rate control model TM5; MPEG-2 video encoder; PSNR quality; computational complexity; quantization parameter; reconstructed image; Bandwidth; Bit rate; Computational complexity; Current measurement; Digital signal processing; Discrete cosine transforms; Image reconstruction; PSNR; Quantization; Testing;
Conference_Titel :
Signal Processing and Information Technology, 2003. ISSPIT 2003. Proceedings of the 3rd IEEE International Symposium on
Print_ISBN :
0-7803-8292-7
DOI :
10.1109/ISSPIT.2003.1341210
