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In this paper, a variable quantization coefficient scanning for macroblock considering the histogram value of previous macroblock's quantization coefficient is proposed. In order to scan a quantization coefficient, the proposed method makes 4×4 histograms for various prediction modes(16×16, 16×8, 8×16, 8×8) by adding 1 if the value of quantization coefficient is not 0. After a final mode decision procedure, the 4×4 histogram of the final mode will be sorted. Then, quantization coefficients in corresponding macroblock of the next frame are scanned using the sorted order. The experimental results show that the proposed scheme reduces the total bits by approximately 0.01 2.25% with similar PSNR performance compared with the previous method.

A Variable Quantization Coefficient Scanning for Macroblock Considering the Histogram Value of Previous Macroblock's Quantization Coefficient