Automatic image cropping
US5978519A · kind A · utility
217Cited by
8References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1996 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Aug 6, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/70
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention describes a method for automatic cropping of images containing regions where intensity levels are uniform and other regions where intensity levels vary considerably. An image to be automatically cropped is scaled down to a grid and divided into non-overlapping blocks. The mean and variance of intensity levels are calculated for each block. Based on the distribution of variances in the blocks, a threshold is selected for the variance. All blocks with a variance higher than this threshold variance are selected as regions of interest. The regions of interest are then cropped to a bounding rectangle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.