Abstract
The existing video coding standard H.264 could not provide expected rate-distortion (RD) performance for macroblocks (MBs) with both moving objects and static background and the MBs with uncovered background (previously occluded). The pattern-based video coding (PVC) technique partially addresses the first problem by separating and encoding moving area and skipping background area at block level using binary pattern templates. However, the existing PVC schemes could not outperform the H.264 with significant margin at high bit rates due to the least number of MBs classified using the pattern mode. Moreover, both H.264 and the PVC scheme could not provide the expected RD performance for the uncovered background areas due to the unavailability of the reference areas in the existing approaches. In this paper, we propose a new PVC technique which will use the most common frame in a scene (McFIS) as a reference frame to overcome the problems. Apart from the use of McFIS as a reference frame, we also introduce a content-dependent pattern generation strategy for better RD performance. The experimental results confirm the superiority of the proposed schemes in comparison with the existing PVC and the McFIS-based methods by achieving significant image quality gain at a wide range of bit rates.
Highlights
H.264, the latest video coding standard [1,2], outperforms its competitors such as H.263, MPEG-2, MPEG-4, etc. due to a number of innovative features in the intraand inter-frame coding techniques
We introduce an efficient arbitraryshaped pattern-based video coding (ASPVC) scheme using a content-based pattern generation strategy from decoded frames and the most common frame in a scene (McFIS) to avoid any frame delay and pattern shape coding
Using conventional Lagrangian multiplier (LM) recommended in the H.264, i.e., λ = 0.85 × 2(QP − 12)/3, the pattern-based video coding scheme encodes a large number of MBs as region-active MB (RMB), which results in low bit rates with low peak signal-to-noise ratio (PSNR) compared to the H.264 for a similar QP
Summary
H.264, the latest video coding standard [1,2], outperforms its competitors such as H.263, MPEG-2, MPEG-4, etc. due to a number of innovative features in the intraand inter-frame coding techniques. Using conventional Lagrangian multiplier (LM) recommended in the H.264, i.e., λ = 0.85 × 2(QP − 12)/3, the pattern-based video coding scheme encodes a large number of MBs as RMBs, which results in low bit rates with low peak signal-to-noise ratio (PSNR) compared to the H.264 for a similar QP. This may be a problem for the existing rate-control mechanisms as the relationship of the QPs and the ratedistortion may be different.
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