Image contour enhancing device

Details Image contour enhancing device Image contour enhancing device

1992-11-19

1993-08-17

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358 37, 358166, 382 54, G06K 936, H04N 5208

Patent

active

052376257

ABSTRACT:
An image contour enhancing device for enhancing contours in images in an image data formed by a plurality of pixel data includes differentiation circuits for differentiating the image data to produce first and second order differentiation signals. The first order differentiation signal represents an image data portion corresponding to front and rear edges of the contour, and the second order differentiation signal represents first and second half portions in each of the front and rear edges of the contour. The second order differentiation is used for a time modulation signal applied to a time modulation circuit to modulate in the time domain the image data in response to the time modulation signal such that the first half portion in the front and rear edges of the contour is delayed, and the second half portion in the front and rear edges of the contour is advanced.

REFERENCES:
patent: 4581631 (1986-04-01), Sonnenberger
patent: 4618990 (1986-10-01), Sieb, Jr. et al.
patent: 4646152 (1987-02-01), Eichelberger et al.
patent: 4888641 (1989-12-01), Isnardi et al.
patent: 4980755 (1990-01-01), Ozaki

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