Image encoding method, image decoding method, moving-image compression method, moving-image expansion method, image encoding program, image decoding device, image encoding device, image encoding/decoding system, and extended image compression/expansion system
US7848580B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2006 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Aug 7, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present image encoding method and the like represents a pixel block prior to performing spatial frequency transformation in processing such as JPEG or the like as a matrix, calculates sum data sc (i) of pixel values in a column i in the matrix and sum data sr (j) of pixel values in a row j in the matrix, calculates nc (i) and nr (j) such that the sc (i) and sc (j) are arrayed in descending order respectively, and when a predetermined condition that permutation is considered reasonable is satisfied, performs permutation of the matrix, generates header information Ph (n) including the nc (i) and nr (j) necessary for subjecting the matrix to permutation in the original state, and adds this to the header of a compressed image file such as JPEG or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.