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Optimization and Implementation of Search Algorithm Based on H.264

Author: ChenHang
Tutor: XuJiaPin
School: Sichuan University
Course: Communication and Information System
Keywords: H.264/JVT Macroblock Motion vector Integer DCT Intra prediction Inter prediction Search algorithm
CLC: TN919.8
Type: Master's thesis
Year: 2006
Downloads: 242
Quote: 2
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Abstract


H.264 is the latest video compression coding international standards , compared with the conventional standard , such as MPEG-1/2/4 and H.261/H.263 H.264 coding efficiency has been improved significantly . Due to the high complexity of the existing algorithms for H.264 , search efficiency directly affects the real-time communication . For the deficiencies of the existing search algorithms expand further research , to propose a new pretreatment method , the dynamic combination of macroblock adaptive fast search algorithm . The image pre-optimized processing of the video image Fourier analysis, the complexity of the image can be obtained , the proposed dynamic macro block division mode and adaptive search template selection . Improved search algorithm , the advantages and disadvantages of several traditional search algorithm analysis , the use of airspace movement correlation proposed a new way of thinking in the search algorithm . Search algorithm using the motion vector value in the predictive mode , based on the predicted values ​​and the thresholds T compares , if less than the threshold T, and the slow motion of a video image , using a small template (SCSA) ; hand, shows intense video image motion , is used large template (LHDSP) search algorithm . Based on the the JM82 model of the full search method FS diamond search method DS IMP algorithm comparison. The large number of simulation experiments show that the the IMP algorithm of search points is only 1.02% of FS algorithm , 69.79% of the DS algorithm . The IMP algorithm greatly reduces the search for the points , to improve the speed of the search , the search cost is reduced . PSNR value remained unchanged , the data ranged between FS and DS . Improved fast search algorithm , and a different combination of macro blocks , which can effectively improve the H.264 encoder speed , it is useful to explore the H.264 real-time applications .

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