1991-11-07
1994-10-25
Nguyen, Phu K.
G06F 1520
Patent
active
053597060
ABSTRACT:
A digital image is rotated clockwise, for example, by the steps of (1) dividing it into rectangular contiguous blocks, the center of any selected block being located to the left and down a half pixel from the center of a contiguous block to the right and being located to the right and up a half pixel from the center of a contiguous block on the left, and the center of said selected block being located above and to the left a half pixel from the center of a contiguous block below and located below and to the right a half pixel from the center of a contiguous block above and (2) rearranging the blocks so that the center of said selected block is located to the left and up a half pixel from the center of said contiguous block to the right and to the right and down a half pixel from the center of said contiguous block to the left, and the center of said selected block is located above and to the right a half pixel from the center of said block below and being located below and to the left a half pixel from the center of said block above.
REFERENCES:
patent: 4829452 (1989-05-01), Kang et al.
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