Determining visually noticeable differences between two images
US6701019B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method and apparatus for determining visually noticeable differences between two input images. A first contrast image is generated from the first input image and a second contrast image is generated from the second input image. A contrast difference image is then formed from the two contrast images. A mean absolute difference is calculated between blocks of pixels of the first and second input image. Pixels in the contrast difference image which exceed a first threshold produce a first threshold signal and if the mean absolute difference exceeds a second threshold so a second threshold signal is produced. A detection signal is produced from the threshold signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.