Quantitative method for embedded video coder
A technology of video encoder and quantization method, which is applied in the embedded field, can solve the problems of not considering the difference in sensitivity between low-frequency and high-frequency components, poor processing efficiency, and affecting the overall efficiency of the encoder, so as to avoid image quality degradation, The effect of improving the overall efficiency
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The present invention uses the visual quantization matrix Q[i,j] to process the DCT coefficients of the discrete cosine transform, and the purpose is to select a larger parameter value for the high-frequency position in the visual quantization matrix according to the characteristics of human vision insensitive to high-frequency data. To eliminate visual redundancy. The present invention includes the following steps:
①Construct the shifted quantization matrix Q 1 = 2 n+4 / (Q[i,j]K q ), where Q[i,j] is the visual quantization matrix, K q Is the quantization factor, and n is the number of bits to shift;
1). Use the visual quantization matrix Q[i, j] to process the DCT coefficients, then the quantization result y once 1 =32x / Q[i,j], where x represents the coefficient to be quantized;
2) Get the quantization factor K through the bit rate control method q , The bit rate control method is a technique well known to those of ordinary skill in the art, using the quantization factor K q ...
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