无反馈分布式视频编码中Wyner-Ziv帧码率控制算法

doi:10.3969/j.issn.1001-2400.2012.04.007

J4 ›› 2012, Vol. 39 ›› Issue (4): 33-38+93.doi: 10.3969/j.issn.1001-2400.2012.04.007

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Rate control algorithm for the Wyner-Ziv frame for no-feedback distributed video coding

QIN Hao;QU Bei;SONG Bin;YANG Mingming

(State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071， China)

Received:2011-04-21 Online:2012-08-20 Published:2012-10-08
Contact: QIN Hao E-mail:hqin@mail.xidian.edu.cn

Abstract

Abstract:

A rate control algorithm for Wyner-Ziv frames for no-feedback distributed video coding system is proposed. Based on the rate-distortion theory and experimental results, the algorithm first establishes the rate-distortion estimation model (RDEM) for each coefficient band of Wyner-Ziv frames, and determines the model parameters by training. With the proposed RDEM, the algorithm is able to estimate the coding rate for each coefficient band of a Wyner-Ziv frame and choose the optimal quantization matrix accordingly to meet the target rate constraint. Finally, the parity rate estimation for each bit plane of each coefficient band is performed to accomplish the LDPC coding. Compared with the existing no-feedback rate control algorithm, numerical results show that the proposed method can increase the average PSNR (peak signal-to-noise ratio) of reconstructed images by 0.3 to 1dB with little complexity incurred at the encoder.

Key words: distributed video coding, Wyner-Ziv frame, rate controls, rate distortion functions

CLC Number:

TN919.8

QIN Hao;QU Bei;SONG Bin;YANG Mingming. Rate control algorithm for the Wyner-Ziv frame for no-feedback distributed video coding[J].J4, 2012, 39(4): 33-38+93.

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Rate control algorithm for the Wyner-Ziv frame for no-feedback distributed video coding

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