| 摘要 |
A quantization matrix adjusting method for quality improvement by scaling down the default quantization matrix. The adjusting method comprises the steps of: updating a used bits BB_X and an average quantizer scale Avg_Q; allocating a bit budget BB_C for a current picture; calculating an estimated quantizer scale EstQ_C according to the used bits BB_X, the average quantizer scale Avg_Q and the bit budget BB_C deciding the operation mode, when the estimated quantizer scale EstQ_C is smaller than a threshold Th_Q, assigning the operation mode as an adjusting mode, otherwise remaining at normal mode; scaling down a default quantization matrix as a new quantization matrix when the operation mode is the adjusting mode; and coding the current picture using the new quantization matrix and default quantization matrix in the adjusting mode and normal mode, respectively.
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