.~.~.~> Rotation of image is limited to 90 degrees, 180 degrees, or 270 degrees
DEFINITION
Classification: 382/296
To rotate an image:
(under subclass 293) Subject matter wherein a coordinate transformation is undertaken for the purpose of turning the image (or a signal representation thereof) about an axis or center, or adjusting the image's orientation and skew.
(1) Note. This subclass includes transformations of a kind that rotate the sampling of an image about an axis while holding the image itself stationary. As an example, an image is sampled first along a sequence of vertical columns to obtain a two-dimensional representation of the image, and this representation is then sampled along a sequence of horizontal rows to obtain still another representation of the image.
