Method for resizing images using integer DCT coefficients
US8068685B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2008 |
| Grant date | Nov 29, 2011 |
| Priority date | — |
| Expiry date | Sep 30, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/4084
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method of converting the size of an image, i.e., resolution of an image, and more specifically, to a method of reducing or enlarging the size of an image using coefficients of integer discrete cosine transform (Integer DCT), which is a type of block transform. Since the method of reducing and enlarging the size of an image according to the present invention reduces or enlarges the size of an image through an integer operation, hardware can be implemented using shifts and additions, and therefore, complexity of the hardware may be lowered, and the method of the present invention provides images of a good quality that is almost the same as the quality of an image provided according to a conventional method of reducing and enlarging an image using real-number DCT coefficients. The method of reducing and enlarging the size of an image according to the present invention is compatible with a H.264/AVC codec.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.