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2010 appears to be the launching date for new compression activities intended to challenge the current video compression standard H.264/AVC. Several improvements of this standard are already known like competition-based motion vector prediction. However the targeted 50% bitrate saving for equivalent quality is not yet achieved. In this context, this paper proposes to reduce the signaling information...
With the rapid development of multimedia technology, video transmission over error prone channels is widely used. Using predictive video coding can lead to temporal and spatial propagation of channel errors, which consequently results in high degradation in the quality of the received video. In order to address this problem different error resilient methods have been proposed. In this paper, a number...
This paper proposes a fast inter prediction mode decision method for H.264. Motion compensation residuals of macroblock are used to analyze motion characteristics of each portion, and reduce the candidate inter modes to a small subset. Compared with the exhaustive mode search, the proposed method achieves an average 63% reduction in computation time with negligible degradation in visual quality. Compared...
A recoding-resisted blind watermark algorithm for H.264/AVC is proposed in this paper in consideration of the new features of this video coding standard. The watermark embedding is realized by modifying the DCT coefficients of each macroblock in I frames. In each Intra_4 × 4 macroblock, the watermark is embedded by modifying the high-frequency DCT coefficient of one specific subblock which has the...
Gradually widely used video coding standard H.264 has greatly improved compression efficiency, but fallen short of high calculation complexity. To simplify the algorithm that full search for intra-prediction mode in H.264 video coding, this paper proposed a fast intra-prediction mode selection method, which used the sum of absolute differences to decide the predicted block size as 16×16 or 4×4, and...
H.264/AVC is the newest video coding standard with high compression efficiency. Especially it adopts traveling algorithm to find the optimal mode for intra-frame prediction in spatial field, so it is quite complex and costs very long encoding-time. In this paper, the proposed fast mode decision scheme consists of two parts: early intra mode detection, which is to select intra 4 × 4 or intra 16 × 16...
A scheme of information hiding for H.264 based on the prediction difference of intra_4 × 4 is proposed in this paper. According to this difference, the proposed algorithm first divided the intra_4 × 4 prediction modes (I4-modes) into two groups to form the rule of mapping between these modes and the bits to be hidden, and then modified the I4-modes by the rule of mapping to implement the hiding of...
The H.264/AVC multi-view extension provides for high compression ratios of multi-view sequences. The coding scheme used exploits spatial, temporal and inter-view dependability for this scope. However, in the event of transmission errors, this leads to the propagation of the distorted macroblocks, degrading the quality of the video perceived by the user. In this paper we introduce error resilient coding...
The popular video coding standard H.264/AVC features many advanced techniques in motion estimation, such as multiple reference frames, variable block sizes, and quarter pixel resolution. These new features significantly improve coding performance, but with extremely high computational complexity. To improve computation efficiency, this paper suggests a selective multiple reference frame motion estimation...
The concept of bidirectional relaying is a key technique to improve the performance in future wireless networks. It applies to three-node networks, where a relay node establishes a bidirectional communication between two other nodes using a decode-and-forward protocol. It divides the whole communication into two phases, namely the multiple access and bidirectional broadcast phase. Here, we concentrate...
This paper presents a fast mode decision algorithm for H.264/AVC encoding optimization. The algorithm is based on probabilistic learning. Spatial correlation between neighboring macroblocks is exploited by K-means clustering to predict the best candidate mode for the current macroblock. Early termination strategy is designed for skipping unnecessary mode checking. Extensive experiments shows that...
H.264/AVC intra encoder uses nine prediction modes in 4×4 and 8×8 block unit to reduce the spatial redundancies. Too many intra modes not only increase the encoder complexity but also increase the number of overhead bits. In order to reduce the number of overhead bits and computational cost, an intra mode bit rate reduction (BRR) method is proposed in this paper. In the proposed method, the numbers...
This paper demonstrates a robust layered video scheme, based on data-partitioning and intended for IPTV streaming over wireless broadband. Equal error protection through rateless coding is applied, whereby higher-priority data partitioned packets are protected by appropriate selection of quantization parameter and picture slicing, so as to regulate packet size. In the mobile WiMAX channel investigated,...
In this paper, we propose a new Distributed Video Coding (DVC) architecture where motion estimation is performed both at the encoder and decoder, effectively combining global and local motion models. We show that the proposed approach improves significantly the quality of Side Information (SI), especially for sequences with complex motion patterns. In turn, it leads to rate-distortion gains of up...
Initial quantization parameter (QP) selection is critical for the overall performance of video rate control. In this paper, we propose an adaptive initial QP selection algorithm for H.264/AVC Scalable Extension (SVC) rate control. The proposed algorithm introduces a number of efficient methods, including a coding complexity measure for intra-frames, and a rate-complexity-quantization (R-C-Q) model...
Much of the attention in the field of video adaptation has been directed to the Scalable Video Coding (SVC), which is the extension of the H.264/AVC standard, since the bit-stream scalability for video is a desirable feature for many multimedia applications. The need for the scalability mainly arises from the need for spatial formats, bit rates or power. To fulfill these requirements, it would be...
H.264/AVC is newest video coding standard of the ITU-T Video Coding Experts Group and the ISO/IEC Moving Picture Experts Group. Stereo video technology is an active research area in current video signal processing filed. More and more researchers are engaged in this field. In this paper, stereoscopic video coding is studied, and three schemes of using H.264/AVC are discussed. An improved scheme is...
This paper achieves the design of a video acquisition and compression codec system, which takes dual-core chips TMS320DM6446 as its core and Linux as its operating system. This is because Linux can be reduced and transplanted. The video capture device driver V4L2 and Codec Engine are introduced in detail, and through H.264 algorithm functions of video compression codec are successfully realized. Relevant...
H.264/AVC the latest international video coding standard achieves higher compression efficiency than previous video coding standards. However, this performance gain comes at the cost of an increased computational complexity. To achieve a high coding efficiency, H.264/AVC employs complex mode decision techniques based on Rate-Distortion Optimization, the computational complexity is very high. This...
An efficient and fast mode decision algorithm for H.264/AVC Intra prediction is proposed in this paper. Overlapping interval differences (OID) are calculated in the domain composed of samples of current block and reconstructed samples of neighboring blocks. The OID can represent the direction error of each prediction mode. Smaller direction error means that the corresponding prediction mode will be...
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