Transform Domain Residual Coding Technique for Distributed Video Coding

Due to its lightweight encoder architecture, the Distributed Video Coding (DVC) concept has been seen as an attractive alternative to its conventional counterparts for a number of applications. Exceptionally low computational complexity has been achieved by moving redundancy exploitation to the decoder. However, going against this norm, redundancy exploitation techniques such as DCT transform and frame difference have been utilized at the encoder end at the expense of a slight increment in computational cost at the encoder. This paper proposes a novel residual quantization technique for DCT transform based inter-frame error coding for DVC. The proposed technique minimizes the entropy of a given video frame by taking the pixel-wise difference between the current frame and a reference frame before DCT transformation. Subsequently an improved quantization technique is proposed to take advantage of small transform coefficients. Experimental results show that the proposed technique significantly improves the objective quality.