Method and apparatus of fixed bit-rate image compression/decompression based on 2×2 image unit
US8774505B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 2012 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Feb 14, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of fixed bit-rate image compression/decompression based on 2×2 image unit encodes an image that is divided into a plurality of 2×2 coding units. The method determines whether a 2×2 coding unit has one of first to seven man-made patterns. When the 2×2 coding unit has one of the first to seven man-made patterns, a differential error encoding and a quantization and look-up are performed on the 2×2 coding unit for generating a first coded data. Otherwise, the 2×2 coding unit is a natural pattern, and the method sequentially performs a color domain transform, a discrete cosine transform, and a quantization and look-up on the 2×2 coding unit for generating a second coded data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.