Abstract
In order to gain the optimal mode,H.264 adopts Rate Distortion Optimization(RDO) technique to compute the cost of every mode for each macroblock,but it increases computational complexity.A precision mode selection algorithm in fast frame was proposed which combined PAN algorithm proposed by Pan.Firstly,the intra prediction's type were decided by whether a macroblock was smooth.Secondly,the PAN algorithm was improved and a new algorithm based on the statistical properties of adjacent blocks was proposed.The experimental results show that the method mentioned in this paper reduces the total encoding time with negligible loss in Peak Signal-to-Noise Ratio(PSNR) and a slightly increased bitrate,compared with full search algorithm and PAN algorithm.
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