Method of determining orientation of image

Details Method of determining orientation of image Method of determining orientation of image

1988-03-24

1989-09-26

Eisenzopf, Reinhard J.

Image analysis

Histogram processing

For setting a threshold

382 6, 382 48, G06K 946, G06K 936, G06K 900

Patent

active

048706949

ABSTRACT:
In an image handling process in which a human body image is recorded and processed and reproduced, the position or orientation of the image, such as a normal erect position or a lying position in which the image is recorded in a 90.degree. rotated position, is automatically determined. The determination of the orientation is carried out by comparing the distribution of the image signal level in the vertical direction of the image with the distribution thereof in the horizontal direction, and the determination based on the difference in pattern of the distributions. The pattern of the distributions is determined by use of a dispersion or symmetry of the distributions. In another aspect, the characteristic values of the image signal level in a vertically extending strip area and a horizontally extending strip area both passing through the central area of the image are compared. As the characteristic values can be used total values or average values of the image signal level. Based on the difference in the characteristic values between the vertical and horizontal strip areas, the orientation of the image or whether the image is in the normal position or not is determined.

REFERENCES:
patent: 4258264 (1979-03-01), Kotera et al.
patent: 4276473 (1980-06-01), Kato et al.
patent: 4315318 (1979-02-01), Kato et al.
patent: 4387428 (1980-06-01), Ishida et al.
patent: 4490851 (1984-12-01), Gerhart

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