Block area wavelet transform picture encoding apparatus

Details Block area wavelet transform picture encoding apparatus Block area wavelet transform picture encoding apparatus

2006-03-21

2006-03-21

Chen, Wenpeng (Department: 2625)

Image analysis

Image compression or coding

Adaptive coding

C382S251000, C375S240190

Reexamination Certificate

active

07016546

ABSTRACT:
In wavelet transform encoding, high-quality encoding is to be realized by enabling picture quality control from one fractional area to another. An input picture100is read out in an amount corresponding to a number of lines required for wavelet transform and buffered in a memory unit6. The input picture then is wavelet transformed in a wavelet transform unit2and quantized in a coefficient quantizing unit3. In quantizing wavelet transform coefficients, the wavelet transform coefficients are multiplied by weighting coefficients from one sub-band to another. The weighting coefficients are determined using the analysis information of a specified block area in a picture, such as motion information and texture fineness information. This enables fine quantization control in terms of a picture block as a unit.

REFERENCES:
patent: 5881176 (1999-03-01), Keith et al.
patent: 5926791 (1999-07-01), Ogata et al.
patent: 6111991 (2000-08-01), Ribas-Corbera et al.
patent: 6201897 (2001-03-01), Nixon
patent: 6229926 (2001-05-01), Chui et al.

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