Automatic image cropping

Details Automatic image cropping Automatic image cropping

1996-08-06

1999-11-02

Couso, Yon J.

Image analysis

Image transformation or preprocessing

Selecting a portion of an image

382270, G06K 920

Patent

active

059785195

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.

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patent: 5450502 (1995-09-01), Eschbach et al.
patent: 5485568 (1996-01-01), Venable et al.
patent: 5608544 (1997-03-01), Yamanishi
patent: 5640468 (1997-06-01), Hsu
patent: 5666503 (1997-09-01), Campanelli et al.

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