Avs Internet Tv Set-top Box Software Design With The Deblocking Filter Algorithm

With the increasingly widespread application of the Internet, and the development of video coding technique, the broad prospects of IPTV business become certain day by day. Among the key technnique in the IPTV, as the domestic terminals set-top box is the interactive bridge between domestic users and IPTV system. In addition, video coding technique is also very important in the development of IPTV business. Nowadays block-based hybrid coding is the main framework of most video coding standards. A big drawback of this architecture is that obvious block artifacts appear when the compression ratio is high. Deblocking filter can reduce block artifacts efficiently and is an important technique in video coding.In this thesis, two aspects of work are done. One is the software design and implementation of set-top box, the other is the study of deblocking filtering technique. Firstly, the thesis introduces the technique of IPTV, video coding technique and the deblocking filtering technique. Secondly, the platform of IPTV set-top box named DM6446 is introduced, and then the AVS video coding standard which is implemented as the video coding standard of IPTV is introduced. The kernel architecture, peripheral devices of DM6446 and the key technique of AVS video coding such as transformation, quantization, intra-prediction, inter-prediction, interpolation, and loop filter is introduced in detail. Thirdly, the system procedures of set-top box which are implemented on the ARM side of DM6446 are introduced in detail. This part focuses on the demultiplex of audio and video data, the design of data interface, the playback of audio and video, and the communication between ARM and DSP. Fourthly, the loop filter algorithm of AVS video coding standard is introduced in full detail, and the optimized procedures of the algorithm on the DSP side of DM6446 are introduced, and then the optimized results are presented. Fifthly, the thesis introduces and analyzes the state-of-art technique of deblocking filter, and proposes a deblocking method, and then the results of proposed method are given. Finally, summarize of this thesis and further development is given.