Image analysis – Histogram processing – For setting a threshold
Patent
1989-09-20
1992-03-31
Razavi, Michael
Image analysis
Histogram processing
For setting a threshold
382 27, 382 43, 382 41, G06K 936
Patent
active
051014416
ABSTRACT:
A method of and device for processing an image by the pattern matching process wherein an image matched with a templet image is determined. In principle, a mismatch degree between the image to be read and the templet image is found by effecting Hadamard transformation on both images and then comparing the images while making use of the Hadamard coefficients found by the transformation of the images. In one embodiment, the matching zone is defined as the zone in which the sum of the absolute values of the differences between the Hadamard coefficients derived from the templet image and the Hadamard coefficients derived from the image to be read takes a minimum value. In another embodiment, differences in Hadamard coefficients of the templet image from those of the image zones each taking the maximum value for each block are added, and then the thus added sum is compared with a pre-set threshold value to determine that the both images, i.e. the image to be read and the corresponding templet image, are mismatched when the added sum is larger than the pre-set threshold value.
REFERENCES:
patent: 4254399 (1981-03-01), Burkhardt et al.
patent: 4817176 (1984-07-01), Marshall et al.
patent: 4899127 (1990-02-01), Kawai et al.
Razavi Michael
Yamaha Hatsudoki K.K.
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