Fast Intra/Inter Mode Decision for H.264/AVC Using the Spatial-Temporal Prediction Scheme
| Autor: | Chih-Chang Chen, 陳志昌 |
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| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 In the H.264/AVC coding standard, large flexibilities for the motion estimation mode, multiple reference frames, intra prediction modes for I-frame, motion estimation refinements, entropy coding… etc. are provided to obtain the optimum R-D cost. Especially, there are seven motion estimation modes from 44 to 1616 are used to find the minimum motion compensation error for each macroblock. For intra prediction mode, there are four prediction modes are used to encode the 88 chroma and 1616 luma blocks and eight prediction directions and one DC prediction are used to encode the intra 44 luma block. Hence, the high computation cost of the full search method in the reference software JM-14.0 make the encoding process inefficient. Therefore, the methods of applying the SAD (sum of absolute difference), homogeneous region analysis, and edge detection are developed to determine the optimum motion estimation mode. However, the additional computation cost of the image processing will reduce the efficiency of the motion compensation process. In this paper, the spatial-temporal correlations between the current frame and the reference frame are analyzed to develop a fast mode decision method for Inter/Intra frame encoding in which no extra image processes are used. Furthermore, the concept of drift compensation is adopted to avoid the error accumulation phenomenon during the mode decision process. The experimental results show that the total computation cost can be reduced about 70%, the total bit rate just increase less than 3.7 %, and the average PSNR is only dropped about 0.08 dB. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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