Method of detecting edges in images

Details Method of detecting edges in images Method of detecting edges in images

1990-07-11

1991-12-17

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 62, 307351, G06K 948

Patent

active

050739581

ABSTRACT:
An image matrix of an image to be filtered is scanned in four different directions, i.e. row-wise, column-wise and also in the two diagonal directions, and in all pixel sequences scanned local maxima and minima are determined. From these values the actual grey-level variation in the non-filtered image is approximated by way of a function which includes an inflection point, for example a sine function. The approximation is realized, for example, according to the least error squares method; the inflection point indicates a point of an edge. interruptions in the course of the edges as well as shifts with respect to the actual image are thus avoided.

REFERENCES:
patent: 4501016 (1985-02-01), Persoon et al.
patent: 4772128 (1988-09-01), Vinarub et al.
patent: 4790027 (1988-12-01), Scherl
L. S. Davis, "A Survey of Edge Detection Techniques", Computer Graphics and Image Processing, vol. 4, No. 3, Sep. 1975, pp. 248-270.

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