نتایج جستجو برای: 264
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The emerging H.264 advanced video coding (H.264/AVC) standard achieves significant improvement in coding efficiency compared with previous standards such as MPEG−2 and H.263. One major contribution of its gain profits from variable−block−size motion estimation, which also leads to higher computational complexity. In this paper, we propose a fast predictive variable−block−size motion estimation ...
In this paper we investigate robust watermarking integrated with H.264/SVC video coding and address coarse-grain quality and spatial resolution scalability features according to Annex G of the H.264 standard. We show that watermark embedding in the base layer of the video is insufficient to protect the decoded video content when enhancements layers are employed. The problem is mitigated by a pr...
A large number of algorithms have been proposed by researchers to reduce H.264 computational complexity. Currently there is no method for reliably comparing the effectiveness of these algorithms. This paper proposes a method that allows direct comparison of the results obtained for various previously published low complexity H.264 encoding algorithms. The method is based on a new coding efficie...
Presently block based transform coding using discrete cosine transform is the most popular approach for video compression. However, when the image is partitioned into blocks, it results is blocking artifacts due to lack of inter-correlation between blocks. These artifacts has much more annoying effect at low bit rates. This paper compares the performance of the in-loop deblocking filter of emer...
Compared with previous video coding standards, H.264/AVC employs a division-free quantization scheme. The relation between quantization parameter and quantization step changes from general linear to exponential as well. In this paper, we first analyze the relation between rate and quantization step-size and derive a new rate-distortion (R-D) model. An efficient rate control scheme is then devel...
The H.264/AVC standard provides high compression efficiency at the cost of increased computational complexity. As a consequence, dedicated hardware circuits are typically required for its most computationally intensive parts, such as the transform coding block that must support multiple transform operations: the 4× 4 forward and inverse integer DCT and the 4×4 and 2×2 Hadamard transforms. In th...
Imagine is a stream-based prototype processor designed for media processing. It uses a three-level bandwidth hierarchy to exploit parallelism and data locality. It has good performance in media processing. H.264 is the newest digital video coding standard. It can achieve high coding efficiency at the cost of complex computation. In addition, video pictures have natural stream features, such as ...
Digital India is the new vision to improve the quality of life by putting the technology into a new face. The smart city leads to digitization of cities, making services more transparent, efficient and easily accessible. The rapid increase in the use of multimedia services on wireless devices has increased the demand of streaming videos sharply. The use of H. 264/SVC video standard over H. 264/...
It is really important to use the proper prediction mode in the H.264 encoder, since there are many more modes than the conventional methods such as MPEG−2. The representative H.264 encoders like JM and JSVM use squared error as the criterion of distortion for mode decision. However, squared error does not always correspond to the distortion from the viewpoint of subjective quality. In this pap...
In this paper, an efficient VLSI architecture proper for adaptive deblocking loop filter in both H.264 and AVS is presented. In this architecture, data access is carefully organized and some other measures are adopted, all that facilitate pipelining in this architecture so as to increase the efficiency of getting data from the SRAM and highly reduce the total cycles of filtering process. This d...
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