Wavelet image compression/recovery apparatus and method using human visual system modeling
US5754793A · kind A · utility
59Cited by
7References
35Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 3, 1995 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Aug 3, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/102
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.