Adaptive Quantization in DCT Domain for Distributed Video Coding
An improved quantization scheme with adaptive quantization levels (AQL) for transform-domain distributed video coding (DVC) is presented in this paper. In the proposed AQL, the quantization level for each DCT band is adaptively determined according to its importance measured by the magnitude of large coefficients. Experimental results demonstrate that the proposed AQL can achieve significant rate-distortion improvement as compared with uniform scalar quantization scheme with fixed quantization levels.