Improving Turbo Codec Integration in Pixel-Domain Distributed Video Coding

Abstract

The field of Distributed Video Coding (DVC) theory has received a lot of attention in recent years and effective encoding techniques have been proposed. In the present work the framework of pixel domain Wyner-Ziv coding of video frames is considered, following the scheme proposed in [1]. Some key frames are supposed to be available at the decoder while other frames are Wyner-Ziv encoded using turbo codes; at the decoder motion compensated interpolation between key frames is performed in order to construct the side information for the Wyner-Ziv frame decoding. In this paper an improved model for the correlation noise between the side information frame and the original one is proposed. It is shown that modeling nonstationary nature of the noise leads to substantial gain in rate-distortion performance. Also the memory of the noise is considered and the importance of placing an interleaver before the turbo code is shown as well.

Reduced decoder complexity and latency in pixel-domain Wyner–Ziv video coders

“…Note that this PDWZ video coder shares its main characteristics with the coders proposed in [4,5,8,13,23]. Hence, the efficiency of our coder is expected to be close to that of the coders of [4,5,8,13,23]. The authors have verified that this holds for the test sequences used later in this section for which the coding efficiency of [4,5,8,13, 23] has been published.…”

“…Hence, the efficiency of our coder is expected to be close to that of the coders of [4,5,8,13,23]. The authors have verified that this holds for the test sequences used later in this section for which the coding efficiency of [4,5,8,13, 23] has been published. As an illustration, we have plotted the rate-distortion performance of our coder and the coder of [13] for the first 100 frames of the test video sequence Foreman in Figure 2.…”

“…The authors have verified that this holds for the test sequences used later in this section for which the coding efficiency of [4,5,8,13, 23] has been published. As an illustration, we have plotted the rate-distortion performance of our coder and the coder of [13] for the first 100 frames of the test video sequence Foreman in Figure 2. The resolution of the sequence is QCIF (176 × 144 pixels/frame) and the frame rate is 30 frames/s.…”

“…The threshold t for Q k was set to 10 −3 . Note that this PDWZ video coder shares its main characteristics with the coders proposed in [4,5,8,13,23]. Hence, the efficiency of our coder is expected to be close to that of the coders of [4,5,8,13,23].…”

“…Some proposed coding schemes apply WZ coding to the pixel values of the video signal and are therefore called pixel-domain Wyner-Ziv (PDWZ) video coders [3-8, 10, 13, 17, 19, 22, 23]; other approaches exploit the statistical dependencies within a frame by applying an image transform and are categorized as transform-domain WZ video coders [2,9,11,14,18,26,27]. In this paper, we focus on the turbo code-based PDWZ video coding architecture, as it is well known in literature [4,5,7,8,13,17,23].…”