Wavelet image compression/recovery apparatus and method using hu

Details Wavelet image compression/recovery apparatus and method using hu Wavelet image compression/recovery apparatus and method using hu

1995-08-03

1998-05-19

Trammell, James P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358463, H04N 1413

Patent

active

057547939

ABSTRACT:
Input image data is wavelet-transformed into wavelet transformed data. First, second and third quantization values respectively corresponding to the frequency variation, background brightness and edge state of the wavelet transformed data are determined. The wavelet transformed data is quantized by using a human visual quantization value for each region corresponding to the first, second and third quantization values. The quantized data is entropy-encoded to generate compressed image data.

REFERENCES:
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patent: 5347479 (1994-09-01), Miyazaki
patent: 5420636 (1995-05-01), Kojima
patent: 5517581 (1996-05-01), Johnston et al.
patent: 5526052 (1996-06-01), Ar
patent: 5541659 (1996-07-01), Kojima
patent: 5557276 (1996-09-01), Sakazawa et al.
.Image Compression Using the 2-D Wavelet Transform., IEEE Transactions on Image Processing, vol. 1, No. 2, Apr. 1992, pp. 244-250.

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