Method and apparatus for image segmentation

Image analysis – Histogram processing – For setting a threshold

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382 18, G06K 934, G06K 946

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active

052533042

ABSTRACT:
Segmentation of characters in a character set (10), made by placing a dark mark against a light background (12), is accomplished by establishing a vertical pixel projection for each pixel column in the image. The vertical pixel projections are filtered with a decay parameter so those pixel columns which contain only background have the highest projection. Thereafter, a set of "cut-points" (points of image segmentation) is obtained so that each cut-point coincides with a pixel column whose vertical pixel projection is both a local maxima and exceeds a predetermined threshold. The number of such cut-points is counted and if the number is not significantly greater than a predetermined number, the image is segmented along the cut-points. Otherwise, the vertical projections of those pixel columns coincident with the cut-points are filtered with a decreasing threshold to reduce the number of potential cut-points.

REFERENCES:
patent: 4562594 (1985-12-01), Bednar et al.
patent: 4635290 (1987-01-01), Tsuji et al.
patent: 4731857 (1988-03-01), Tappert
patent: 5033098 (1991-07-01), Tanaka et al.
patent: 5050224 (1991-09-01), Mori

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