Visually optimized quantization
US8442338B2 · kind B2 · utility
2Cited by
1References
26Claims
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Key dates
| Filing date | Feb 28, 2011 |
| Grant date | May 14, 2013 |
| Priority date | — |
| Expiry date | Jan 29, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Visually optimized quantization is described herein. Specifically, the visually optimized quantization is for arbitrary block-based transforms such as Mode-Dependent Directional Transform (MDDT). The compression method involves the process of taking a discrete cosine transform of an MDDT basis function, obtaining the frequency weights, and computing the contrast sensitivity function for each of the frequency components. The overall effect of the distortion is calculated by error pooling and the quantization matrix is the inverse proportional of the overall effect.
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