Rotation of digital images

Details Rotation of digital images Rotation of digital images

1983-10-31

1985-10-01

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

340727, G06K 936

Patent

active

045450692

ABSTRACT:
A method for the rotation of digital images which minimizes the number of disk accesses needed. It is useful where the size of the image is large compared with the available computer memory. In a first step, the image is divided into horizontal regions of equal size, such that each region can fit, and be manipulated in the computer memory. Each region is rotated separately, and a scratch file is produced, which contains, in sequence, the rotated regions. In a series of subsequent steps, the rotated regions are, in each step, doubled in size until one region contains the entire rotated image. The method works for any rotation angle.

REFERENCES:
patent: 3811110 (1974-05-01), Inose et al.
patent: 4000486 (1976-12-01), Schomburg
patent: 4052699 (1977-10-01), Micka et al.
patent: 4168488 (1979-09-01), Evans
patent: 4271476 (1981-06-01), Lotspiech
IBM Technical Disclosure Bulletin, vol. 18, No. 8, Jan. 1976, pp. 2633-2639.
IBM Technical Disclosure Bulletin, vol. 17, No. 10, Mar. 1975, pp. 3026-3028.
IEEE Transactions on Computers, "A Fast Computer Method for Matrix Transposing", Jul. 1972, pp. 801-803.

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