Image processing apparatus and method
US7613349B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2006 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Apr 22, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing method and apparatus capable of decoding and reducing image data encoded with an orthogonal transformation and a variable length decoding in high speed without degrading the accuracy of the reduced image data. In the method and apparatus, the image data are decoded by a variable length decoding and an inverse orthogonal transformation, and reduced to a predetermined target resolution. The image data are decoded by the variable length decoding and resolution of the decoded image data is obtained. Then, the obtained resolution is compared with the target resolution to select the low frequency components to be used for the inverse orthogonal transformation based on the comparison result. Thereafter, an optimum reduction method is selected based on the comparison result, and the decoded image data are reduced by the selected reduction method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.