Image analysis – Image segmentation – Distinguishing text from other regions
Patent
1996-10-08
1999-02-02
Johns, Andrew
Image analysis
Image segmentation
Distinguishing text from other regions
382173, 358462, 358464, G06K 934, H04N 140, H04N 138
Patent
active
058675930
ABSTRACT:
An image region dividing apparatus includes a same-kind image region extraction unit for dividing a digital image into blocks by extracting boundaries, from the background, of regions where same kinds of images are present, from the digital image; horizontal and vertical difference detectors for obtaining the difference values of the luminance levels of adjacent pixels in the horizontal and vertical directions from a discrimination target block; a feature pattern discrimination unit for performing recognition processing on the basis of a correlation between the shapes of a calculated corrected luminance level histogram ys and a calculated gradient vector direction histogram .theta.r; and an image kind determination unit for determining image kinds. The apparatus performs image kind discrimination of each discrimination target block.
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"Image Clasification by the Foley-Sammon Transform", Optical Engineering, Jul. 1986, vol. 25, No. 7, pp. 834-840.
Fukuda Hiroyuki
Imade Shinichi
Nishino Hirokazu
Tatsuta Seiji
Davis Monica S.
Johns Andrew
Olympus Optical Co,. Ltd.
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