Method and apparatus for optimizing quantizer values in an image

Details Method and apparatus for optimizing quantizer values in an image Method and apparatus for optimizing quantizer values in an image

1998-01-16

2000-08-29

Tran, Phuoc

Image analysis

Image compression or coding

Quantization

382232, 382238, 382270, 348405, G06K 936, G06K 938, H04N 712

Patent

active

061119911

ABSTRACT:
A quantizer controller identifies a target bit value equal to a total number of bits available for encoding a frame. A total amount of distortion in the frame is modeled according to predicted quantization values for each one of the blocks. The predicted quantization values are characterized according to an amount of energy in each block and a number of bits available for encoding each block. Quantization values for each block are optimized by minimizing the modeled distortion in the frame subject to the constraint that the total number of bits for encoding the frame is equal to the target bit value. Each block is then encoded with the optimized quantization value.

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patent: 5757434 (1998-05-01), Klein Gunnewiek et al.
patent: 5768436 (1998-06-01), Keesman
patent: 5790196 (1998-08-01), Sun et al.
patent: 5822461 (1998-10-01), Choi
patent: 5832125 (1998-11-01), Reese et al.
patent: 5903673 (1999-05-01), Wang et al.

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