Method and apparatus for rotating an image

Details Method and apparatus for rotating an image Method and apparatus for rotating an image

1994-04-13

1995-05-02

Nguyen, Phu K.

G06F 1562

Patent

active

054127688

ABSTRACT:
In a method and an an apparatus for rotating a source image about a reference point on a reference coordinate axis through an arbitrary angle .theta. to obtain a destination image, the source image is represented by a group of reference blocks. Each of the reference blocks has N.times.N pixels and is composed of a square having a side parallel to an axis which is rotated relative to the reference coordinate axis by an angle of .times..theta.. One of vertexes of each of the reference blocks is defined as a rotation center vertex. Each of the reference blocks is rotated about the rotation center vertex by an angle of .theta. to obtain a rotation block. Calculations are made on shift quantities .DELTA.Y and .DELTA.X of the rotation center vertex of each of the rotation blocks. The shift quantities .DELTA.Y and .DELTA.X result from a rotation of the rotation center vertex about the reference point through an angle of .theta.. The shift quantity .DELTA.Y is defined as extending along the reference coordinate axis, and the shift quantity .DELTA.X is defined as extending perpendicular to the reference coordinate axis. The rotation block is translated in a direction of the reference coordinate axis by the shift quantity .DELTA.Y, and is translated in a direction perpendicular to the reference coordinate axis by the shift quantity .DELTA.X to obtain the destination image.

REFERENCES:
patent: 4843405 (1989-06-01), Morikawa et al.
patent: 4985849 (1991-01-01), Hideoki

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