Image compression controller and image pickup system using the same
US6600837B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2000 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Oct 11, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image compression controller capable of simplifying the quantization coefficient control in an image compression process and attaining a high speed In image compression, including a first quantization circuit for first quantization based on a quantization coefficient on an output signal from a DCT circuit, a second quantization circuit for second quantization based on a second quantization coefficient, counters for counting the number of “0's” in the first quantization data, a quantization coefficient control circuit for generating a plurality of reference control coefficients and generating control coefficients based on counts of the counters and a “0” reference value, a first multiplier for generating a first quantization coefficient based on a reference quantization coefficient and a reference control coefficient, a second multiplier for generating a second quantization coefficient based on a control coefficient and a reference quantization coefficient, and an entropy coding circuit for entropy coding on the second quantization data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.