Image rotation apparatus

Details Image rotation apparatus Image rotation apparatus

G - Physics

06

K

354/236, 350/37,

G06K 9/36 (2006.01) G06T 3/60 (2006.01) G09G 5/393 (2006.01)

Patent

CA 1122696

ABSTRACT Image rotation apparatus suitable for use in an image display system in- cludes a word-organized digital image buffer divided into squares representing sub-images and having a size equal to the size of a word. Means are provided for writing the bit pattern of each sub-image word-by-word into an n x n stor- age array and for re-writing the contents of the storage array word-by-word back into the image buffer but with the words re-oriented by 90°. Where the image buffer is itself square, it is divided into quadrants: re-oriented words from one quadrant are then written back from the array to the adjacent quadrant. In this event two interconnected n x n storage arrays can be used, one acting as a buffer for the creation of space within the image buffer prior to the re- oriented words being written therein.

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