Research On H.264/AVC Video Compression Coding Algorithms And Its Implementation

With the development of information technology and the improvement of net-work transmission speed, video technology has been widely applied in people's life.In order to meet the people's requirement of the video quality and the transmissionspeed, a newest international video coding standard H.264/AVC is proposed by thetwo big video organizations ITU-T and ISO/IEC. This standard has the virtue of thehigh compression ratio and the good network affinity, which has been widely used inthe field of video telephone,the remote monitoring,3G communications and videostorage and so on. It is one of the hotspots in the video compression coding field.Compared with the previous video compression coding standard, H.264can savethe code rate up to about50%with the same image quality, but its superior perform-ance is at the cost of the double complexity. The high complexity has become thebottleneck of the H.264in the field of the real-time video coding and the transmission.Therefore, it has great significance to study the video coding algorithm and imple-mentation of H.264.The main task of this paper is to study the key coding algorithms of H.264andanalyze its coding complexity, and especially improve the coding pattern selectingalgorithm of the high complexity.Firstly, this paper has stated the development of the H.264standard and hasanalyzed the each module of the H.264video coding layer and the advance technolo-gies of the corresponding module specifically, such as transform encoding, predictionencoding, entropy encoding and loop-filter.Secondly, the property and the algorithm complexity of the H.264encoder areanalyzed in detail, and the prediction module selection of the high complexity isstudied. In order to solve the large amount of calculation of the prediction model se-lection, this paper precludes a part of the prediction modules with the neighboringmacro block coding mode correlation and the image texture feature, which has nar-rowed the scope of the pattern choice. The calculation number of the RDO for codinga macro block has reduced from592times to272times. The simulation results havedemonstrated that the proposed algorithm can reduce calculation complexity signifi-cantly in keeping the image quality and bit rate of the premise.Finally, this work has discussed the DSP implementation of H.264coding algo- rithm. By analyzing the JM code, the baseline coding algorithms under the PC win-dows operating system are changed into DSP program which can compile in CCS.Then the H.264coding algorithms were simulated in the CCS3.3. This work proposedthe solution to the common problems during the implementation progress.