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

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

Transform Domain Unidirectional Distributed Video Coding Using Dynamic Parity Allocation

DVC based video codecs proposed in the literature generally include a reverse (feedback) channel between the encoder and the decoder. This channel is used to communicate the dynamic parity bit request messages from the decoder to the encoder resulting in an optimum dynamic variable rate control implementation. However it is observed that this dynamic feedback mechanism is a practical hindrance in a number of practical consumer electronics applications. In this paper we proposed a novel transform domain Unidirectional Distributed Video Codec (UDVC) without a feedback channel. First, all Wyner-Ziv frames are divided into rectangular macroblocks. A simple metric is used for each block to represent the correlations between the corresponding blocks in the adjacent key frame and the Wyner-Ziv frame. Based on the value of this metric, parity is allocated dynamically for each block. These parities are either stored for offline processing or transmitted to the DVC decoder for on line processing. Simulation results show that the proposed codec outperforms the existing UDVC solutions by a significant margin