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In order to transmit live video or video streaming at low bit-rates, the encoder usually needs to reduce the frame rate to cope with the available bandwidth. In this paper, a new dynamic frame-skipping scheme for live video encoding based on motion detection in the adaptive length sliding window is proposed. The length of a sliding window can be adjusted according to bandwidth variation in order to...
The paper optimizes AVS key coding algorithm, and designs high coding efficiency and high coding quality AVS encoder XAVS based on x86 platform. It supports IPPP, IBBP structure, films on a variety of formats of media sources to AVS compression, rate control, rate distortion optimization, and packaged into the standard TS stream. The experiment results show that subjective quality of XAVS is better...
The spatial domain resolution adjustable method is raised, based on the Region of Interest. The original input image is divided into the region of interest and the region of non-interest in accordance with the RIO information. As to the region of interest, perform coding on the resolution of the original image. As for the region of non-interest, first extract samples and then encode these samples...
H.264 adopts variable length coding and interprediction techniques, so compressed image is very sensitive to channel error. Meanwhile errors will influence subsequent frames, easily leading to the distortion of rebuilding images. To enhance the quality of reconstructed images, this text proposes a weighted outer boundary matching algorithms based on multiple reference frames, which exploits the characteristic...
An appropriate search region is necessary for efficient multiview video coding (MVC). In this paper, the global disparity of two views is used to decide the size of the search region adaptively in the inter-view prediction of MVC. We first propose a simple method to obtain the global disparity vector (GDV) quickly, and analyze the relationship between the real disparity vector (DV) and GDV. It is...
Packet losses or errors of high compressed video stream during transmission over error-prone channel may cause serious decline in video quality. Error concealment (EC) at decoder side is an effective technology to reduce this video degradation. This paper proposes a Dynamic Temporal Error Concealment (DTEC) algorithm for H.264, which chooses different error concealment approach according to the variance...
Mixing multiple channel video streams is an essential function for the multiple-point processing unit of video conference system. The traditional mixing methods have the disadvantage of high computational complexity and severe image distortion. This paper proposed a mixing method based on the video syntax and semantics mapping in DCT-domain. The experimental results reveal that the PSNR has shown...
For image and video compression standards, one image is divided into a serial of non-overlapped blocks. Detecting edge existence and analyzing the edge direction in a block level is useful in the applications, such as perceptually improved coding, MB encoding mode decision, blocking artifacts reduction, content-based retrieval, senses changing detection, etc. This paper proposes a novel Fast Block...
In connection with the trend at Compression Solution For Monitoring Video Based On H.264, this paper propose an Efficient Compression Solution For Monitoring Video based on removal of redundant content, and describe it with the idea of Content Detection and Layered Quantization. This paper focus on the methods and implementation process of Macroblock-level layered quantization, and also analysis the...
Many problems have been identified in Internet applications such as slow network-access speed, frequent packet loss, etc. The constraints on bandwidth, excessive server downloading, instability of network performance and other factors may contribute to these problems. To seek the solutions to these problems in Internet, the author in this paper proposes the CDN (Content Delivery Network)-and-H.264...
This paper discusses problems about video security based on H.264 video compression encoding standard, puts forward a design scheme of encryption about video meeting. The video encryption system combines with AES (Advanced Encryption Standard) algorithm, H.264 and the chaos encryption. In this scheme, AES is used in encrypting DCT Coefficients and motion vector symbol sequence of H.264. The protection...
This work focuses on generating better side information by exploiting the gains of variable block size based motion-compensated interpolation (VBMCI). Wyner-Ziv video coding (WZVC) conduct temporal prediction at the decoder, and this leads two results: temporal prediction has no access to the current frame and there is no motion vectors sent from the encoder to the decoder. Both make traditional variable...
AVS is Chinese standard with independent intellectual property rights for the second-generation source coding. In this paper, we give an overview of AVS and stream structure. Then we analyze the influence of bit error in various group fields and classify those fields by effects on the quality of the video sequence. On this basis, we find out a method to describe the performance of error resilience...
Real-time streaming media transmission of wireless networks technology has become the research focus, mobile network based on CDMA2000 can meet the requirements of video data bandwidth of real-time transmission. According to the characteristics of mobile wireless networks, and the features of video compression coding, designed a scheme for streaming media transmission, can improve the quality of real-time...
"What part of the video signal should be coded using what method" is a challenge for Wyner-Ziv video coding (WZVC). The challenge results from that in WZVC the temporal prediction is performed at the decoder, so the encoder hardly determines what part of the signal should be coded using what method. In this paper a novel coefficients classification strategy utilizing both texture information...
This paper figures out an advanced-terminal algorithm for H.264 motion estimation, based on all zero block. The algorithm was improved on the sector with the all-zero blocks. Otherwise, it improved the efficiency of motion estimation by using the relevance of different segmentation modes. During the experiment, it reduced the motion estimation point after testing different video sequences. The results...
Error Control is an important aspect for video coding and transmission. In this paper, we study error control for MGS-based bitstream. Our method not only duplicate the key data of MGS slice to improve the quality of decoded video, but also construct a compensated MGS slice to maintain bitstream conformance. Experiments show better effect and better performance of the proposed method compared to the...
Undoubtedly, peer-to-Peer (P2P) technology is an effectively method for delivering streaming media content over the internet. However, current P2P stream systems also suffer many problems, such as huge bandwidth consumption, less effective in heterogeneous environment, protection of important data, etc. Scalable video coding (SVC), as an extension of H.264/AVC standard, has attracted many researchers...
Real-time Transport Protocol (RTP) is usually used to provide real time transportation and quality guarantee of scalable video coding (SVC) stream. Base on the analysis of SVC stream structure and real-time transport protocol, RTP encapsulation is implemented for H.264/SVC stream. A simulation method is proposed to simulate the transport process of the scalable video in the common test conditions...
A real-time H.264 video stream transmission system which based on standard RFC is designed and implemented in this paper. In order to overcome the adverse factors as high bit error and low bandwidth through the wireless channel, this paper proposes UDP / RTP virtual links that under the CDMA2000 EVDO to ensure real-time transmission. At the meantime, in order to make up the lack of AIMD algorithm,...
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