Coding and decoding device, coding and decoding method and program
US8229234B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 2007 |
| Grant date | Jul 24, 2012 |
| Priority date | — |
| Expiry date | Aug 9, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A coding device is comprised of an initial resolution coding unit for coding an initial resolution image sub-sampled from an image at every interval of predetermined pixels, and a high resolution coding unit for coding images at sub-sampling intervals sequentially halved, wherein said high resolution coding unit comprises a pixel value predicting means for, out of the pixels that should be coded in present resolution, predicting a value of a pixel being positioned at a center of its adjacent four pixels already coded in previous resolution from said adjacent four pixels with a linear interpolation, and predicting a value of a remaining pixel from its adjacent four pixels having the above pixel at a center thereof with the linear interpolation, said adjacent four pixels being positioned in an upper, lower, left and right sides of the above pixel, a prediction error calculating means for obtaining a residual between the pixel value of the to-be-coded pixel and the predicted value, and a variable length coding means for coding the residual.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.