Method and device for compressing an image and storage medium carrying an image compressed by said method
US8478060B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 2009 |
| Grant date | Jul 2, 2013 |
| Priority date | — |
| Expiry date | Oct 24, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/647
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention is related to a method for compressing images. The proposed method comprises associating perceptual importance parameters with pixels of the image, applying a transform on the image, partitioning the transformed image into code blocks and encoding coefficient bits of a given code block together from a most significant bit plane towards a least significant bit plane, wherein encoding of at least one coefficient is truncated at a truncation bit plane depending on the perceptual importance parameter associated with the pixel to which said code block coefficient corresponds. Truncating encoding of coefficients in dependency on the perceptual importance of the pixel associated with the coefficient allows for truncating coefficients corresponding to perceptually less important pixels at more significant bit planes. So, the overall perceptual quality of the compressed image is enhanced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.