Image analysis – Histogram processing – For setting a threshold
Patent
1988-02-11
1989-05-23
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 34, G06K 948
Patent
active
048337218
ABSTRACT:
An image processing apparatus comprises a detector which includes an image reading section of a digital copier and which chases outline information of an image pattern in a predetermined direction and thereby extracts outline points; an arithmetic operating circuit to respectively obtain outline tangential directions on the basis of the outline points; an extracting circuit to select a predetermined number of extraction points from the outline points; a coding circuit to sequentially obtain direction differences in the outline tangential directions on the basis of the extraction points and to code the direction differences; and a recognizing circuit to perform a non-linear matching between a code sequence coded by the coding circuit and a reference code sequence, thereby recognizing the image pattern. The coding circuit calculates the outline tangential directions using predetermined direction codes. With this apparatus, an image pattern can be stably and accurately recognized at high speed without being influenced by positional deviation, rotation, change in size, or the like of the image pattern.
REFERENCES:
patent: 3863218 (1975-01-01), Oka et al.
patent: 3942169 (1976-03-01), Fujimoto et al.
patent: 4093941 (1978-06-01), Bryan et al.
patent: 4566128 (1986-01-01), Araki
Herbert Freeman, Computer Processing of Line-Drawing Images, Mar. 1974, ACM Journal.
Okutomi Masatoshi
Sueda Tetsuo
Tokuhara Mitsuhiro
Boudreau Leo H.
Canon Kabushiki Kaisha
LandOfFree
Image processing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image processing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image processing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1736039