Quantization matrix adjusting method for quality improvement

Details Quantization matrix adjusting method for quality improvement Quantization matrix adjusting method for quality improvement

2008-06-24

2008-06-24

Chen, Wenpeng (Department: 2624)

Image analysis

Image compression or coding

Quantization

C375S240030

Reexamination Certificate

active

07391916

ABSTRACT:
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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Section 7.4.2, ISO/IEC 13818-2 (1995) ITU-T H262 (1995) MPEG 2, pp. 83-86.

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