Fast 180 degree image rotation and reversal

Details Fast 180 degree image rotation and reversal Fast 180 degree image rotation and reversal

1994-09-08

1996-10-08

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

382293, 382296, G09G 534

Patent

active

055636250

ABSTRACT:
A method of reversing all of the pixels in an image word uses recursive steps of shifting the image word a varying, predetermined number of spaces, followed by filtering the shifted and unshifted words through a varying, predetermined mask. The number of cycles necessary to reverse an image word having 2.sup.n pixels is n cycles, plus one additional shifting step. This method of reversing a single image word is used to generate the mirror image of an input image. This image word reversal method is also useful for rotating an image word 180 degrees about an axis through its center.

REFERENCES:
patent: 4947344 (1990-08-01), Hayashi et al.
IBM Technical Disclosure Bulletin Article Entitled "90.degree. and 270.degree. Degree Rotation of a 2.sup.n Binary Image Using a 2.sup.n Bit Processor" By C. Cox, vol. 30, No. 12, May 1988, pp. 26-28.
IBM Technical Disclosure Bulletin Article Entitled "Method for Rotating an 8.times.8 Bit Image" by G. Goertzel, vol. 27, No. 8, Jan. 1985, pp. 4593-4595.

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