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In this paper, we propose a parallel algorithm for H.264/AVC deblocking filter which is scalable to the number of processors. Unlike the conventional approach, which is limited by the independent data units, the designed algorithm allows issuing dependent data units concurrently to decrease the penalty from synchronization of data units. For the general-purpose dual-core processors, experimental results...
The Lagrangian multiplier based rate-distortion optimization has been proved to be an effective way in hybrid video coding. In this paper, an advanced Lagrange multiplier selection method is presented. Based on Laplace distribution, the variance of transformed residuals is introduced into the rate and distortion models. Moreover, inspired by the p-domain method, the percentage of non-zeros among quantized...
In video communications over error-prone environments, compressed video is fragile to transmission errors. The decoder side error concealment (EC) is an efficient way to recover a damaged video sequence. Typically traditional video EC algorithms for H.264/AVC intra-frames operate in macroblock (MB) level and they offer a single concealment mode for all frames regardless of frame features. This paper...
Wireless video transmission is expected to experience whole frame losses since data packets always carry a whole frame in low-bitrate coding scenario. In this paper, a novel whole frame loss recovery scheme is proposed. A vector map Vmap for each frame is generated and encoded into the bitstream of the next frame. The Vmap contains useful information for decoder to recover the motion vector of the...
H.264/MPEG-4 Part 10 is the state-of-art video compression standard that promises approximately two fold compression over the preceding popular coding standards and offers efficient network friendly syntax. In addition to the various coding tools, the H.264/AVC offers a rich set of error resilience tools. Among them flexible macro block ordering (FMO) and arbitrary slice ordering (ASO) are two important...
In this paper, multi-pass and frame parallel algorithms are proposed to accelerate various motion estimation (ME) tools in H.264 with the graphics processing unit (GPU). By the multi-pass method to unroll and rearrange the multiple nested loops, the integer-pel ME can be implemented with two-pass process on GPU. Moreover, fractional ME needs six passes for frame interpolation with six-tap filter and...
This paper presents a novel information hiding algorithm for H.264/AVC, taking advantage of the specific features of this advanced video compression standard. The algorithm hides 1 bit in each qualified intra 4x4 luma block by modifying intra 4x4 prediction modes (I4-modes) based on the mapping between I4-modes and hiding bits. Information hiding rate is controlled by a parameter, embedding strength,...
The deblocking filter in H.264/AVC is used on low-end terminals to a limited extent due to computational complexity. In this paper, variable block-based deblocking filter that efficiently eliminates the blocking artifacts occurred during the compression of low-bit rates digital motion pictures is suggested. Blocking artifacts are plaid images appear on the block boundaries due to DCT and quantization...
A novel macroblock layer rate control algorithm for H.264/ AVC is proposed in this paper. To solve the issues of rate control model in H.264/AVC, we presented a new coding complexity measure based on integer transform coefficients, so-called mean absolute transform quantized distortion (MATQD). Then, we proposed four effective models respectively to improve our rate control performance, including...
In this paper, an error resilience video coding scheme is proposed based on the redundant slice feature in H.264/AVC. With the proposed scheme, the source redundancy in a coded bitstream can be adjusted flexibly according to changing channel conditions such as available bandwidth and data loss rate, without the need of complicated re-encoding or transcoding. To achieve good resilience performance,...
Free viewpoint TV (FTV) is a new media format that allows a user to change his/her viewpoint freely. To this effect, multi-view video must be coded to satisfy two conflicting requirements: (i) achieve high compression efficiency, and (ii) allow view switching with low delay. This paper proposes a new encoding configuration for scalable multi-view video coding, which achieves a compromise between the...
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