Adaptive rate control algorithm for DPCM/DCT hybrid video codec adopting bidirectional prediction

Seong Hwan Jang; Seop Hyeong Park

doi:10.1117/12.157880

22 October 1993 Adaptive rate control algorithm for DPCM/DCT hybrid video codec adopting bidirectional prediction

Seong Hwan Jang, Seop Hyeong Park

Proceedings Volume 2094, Visual Communications and Image Processing '93; (1993) https://doi.org/10.1117/12.157880
Event: Visual Communications and Image Processing '93, 1993, Cambridge, MA, United States

Abstract

In DPCM/DCT hybrid coding algorithm like MPEG, rate control strategy is the key to the reconstruction of images with high quality. In this paper, we propose a new rate control algorithm for DPCM/DCT hybrid video codec which are capable of handling scene change pictures and maintaining small variations of reference quantization parameter within a picture. If a scene change is detected at P pictures, the number of target bits is increased enough to reconstruct images with high quality. In order to allocate the appropriate number of bits to each macroblock, the number of generated bits by a macroblock is estimated before quantization. Experimental results show that the proposed algorithm gives more than 1.5 dB improvement in PSNR at scene change pictures compared to the rate control algorithm described in TM5. It is also shown that the proposed algorithm reduces the variation of the reference quantization parameter within a picture compared to the rate control algorithm in MPEG2 video TM5. This results in uniform distribution of the PSNR of each macroblock within a picture.

Citation Download Citation

Seong Hwan Jang and Seop Hyeong Park "Adaptive rate control algorithm for DPCM/DCT hybrid video codec adopting bidirectional prediction", Proc. SPIE 2094, Visual Communications and Image Processing '93, (22 October 1993); https://doi.org/10.1117/12.157880

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