Method of extracting contour of a subject image from an original

Details Method of extracting contour of a subject image from an original Method of extracting contour of a subject image from an original

1989-04-10

1992-02-25

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 33, 382 50, 382 51, 358458, 358 96, G06K 946

Patent

active

050919679

ABSTRACT:
An image window (N) is intermittently moved along the contour (CT) of a subject image (I). At a respective paused position of the image window, a spacial differential of the density level is calculated for each pixel in the image window. A differential histogram is produced from the respective differentials, and a threshold level (Eth) is determined from the differential histogram and a designated percentile ratio. A contour image is then obtained by discriminating the respective differentials with the threshold level.

REFERENCES:
patent: 4797943 (1989-01-01), Murayama et al.
patent: 4868884 (1989-09-01), Miyazaki et al.
patent: 4884224 (1989-11-01), Hirosawa
"Study of Many-Sided Image Processings and Software Systems for the Same", Hideyuki Tamura, Reports of Research in Electro Technical laboratory, vol. 835, Chapter 3, pp. 25-64, 1984, Japan.
IBM Technical Disclosure Bulletin, vol. 14, No. 4, Sep. 1971, pp. 1302-1304.

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