Image analysis – Image segmentation – Distinguishing text from other regions
Patent
1998-08-26
2000-08-29
Tadayon, Bijan
Image analysis
Image segmentation
Distinguishing text from other regions
382175, G06K 900
Patent
active
061119822
ABSTRACT:
A first feature parameter calculating circuit outputs, as a variable of a first feature parameter, a difference between a maximum value and a minimum value of signal levels of pixels calculated in a local block having a target pixel at a center. A second feature parameter calculating circuit determines sums of differences in signal level in the local block, along a direction in which the pixels are arranged, and outputs, as a variable of a second feature parameter, a minimum value of the sums. A third feature parameter calculating circuit binarizes the pixels in the local block, and counts the number of succeedingly arranged pixels having equal density, for example, along a main scanning direction, and calculates a difference between a maximum value and a minimum value of the numbers counted. In the same manner, a difference is also calculated along a sub scanning direction, and larger of two differences is outputted as a variable of a third feature parameter. A judging circuit categorizes each variable multi-dimensionally so as to discriminate a region including the target pixel.
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Alavi Amir
Sharp Kabushiki Kaisha
Tadayon Bijan
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