Method and system for measuring video image degradations introduced by an encoding system with throughput reduction
US7801221B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2003 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Jun 26, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of measuring the degradations in a digitized image, which are introduced during the encoding of the image is provided. The method consists in: retrieving the block decomposition of the image used during the encoding thereof; offsetting the coding grid in relation to the image such as to define an analysis block decomposition of the image, whereby each analysis block covers a boundary between two adjacent blocks; applying a transform calculation to the pixel data of the image which is encoded using the offset coding grid; extracting the transformed coefficients obtained for each analysis block, coefficients which are likely to be affected by a block effect; applying an inverse transform calculation to the extracted transformed coefficients in order to determine the pixel data of each analysis block; and, for each analysis block, calculating a degradation indicator and, subsequently, the degradation of the image from the degradation indicators for each analysis block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.