H.264 Video Compression Principle From the viewpoint of information, the image is used as a source of sources, and the data describing the source is the sum of the amount of information (source entropy) and information redundancy. There are many kinds of information redundancy, such as spatial redundancy, temporal redundancy, structural redundancy, redundant knowledge, visual redundancy, data compression, essentially reduce the amount of redundancy. It can be seen that redundancy reduction can reduce the amount of data without reducing the amount of information. From mathematics, the image can be seen as a multidimensional function, and the compression describes the amount of data of this function to reduce its relevance. According to the composition element of image information, H.264 uses intra prediction, inter prediction, motion estimance, and motion compensation, integer transformation, and the like to improve the compression ratio of the image. The intra prediction is that H.264 may be the same properties as the adjacent pixels in the image, using the correlation of adjacent pixels, adopting the new intra prediction mode, by the pixels of the current pixel block (the encoded reconstruction) pixel) prediction, only the difference between the actual value and the predicted value for encoding, so that with a relatively small number of bits to express the pixel block intra coded information; inter prediction by the multi-frame motion prediction with reference to a smaller area and The method is accurately predicted on the next frame, thereby reducing the amount of data transmitted, achieving the time domain dependency of the image. The H.264 transforms the residual result of the motion estimate and intra prediction from the time domain to the frequency domain, using an integer transformation similar to 4 × 4 discrete cosine transform (DCT), rather than MPEG-2 and MPEG-4 That is used with a floating point number of 8 × 8 DCT. With an integer-based spatial transformation has a good effect, the calculation is fast (only the addition and shift operation), the adaptation problem does not appear in the anti-transformation process, and combined with the quantization process, it is ensured that in the 16-bit computing system, The calculation results have the maximum accuracy and will not overflow. 4 × 4 transform blocks also reduce block effects and shom effects.
H.264 The application of the standard, providing technical support for the network transmission of the video, in particular low-bandwidth (such as wireless transmission mode). Today, in today's market, the market requires designers to launch the product faster, and in order to maintain the competitiveness of the product, maintain enough advantages in product prices, product application features, especially in the field of multimedia markets. Haisi's SOC chip is based on the standard algorithm, giving the designer's largest flexibility to design the right product, which greatly reduces the investment cost of the manufacturer and shortens the time of the manufacturer's introduction, and prepares for the market. . Technology area
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