Small angle image rotation using block transfers

Details Small angle image rotation using block transfers Small angle image rotation using block transfers

1984-07-05

1989-05-09

Chin, Gary

Boots, shoes, and leggings

364521, 340727, 382 46, G06F 1520

Patent

active

048294527

ABSTRACT:
A simplified method for rotating a digital image through a small angle without the need for interpolation is described. The image is divided into small, square blocks, arranged in horizontal rows where each block is exactly to the left or right of the other blocks in the row, and into columns where each block in the column is offset to the right by one pixel with respect to the next higher block. The rotation is then accomplished by moving the lower rows to the left so that the columns are exactly vertical, and by moving the rightmost columns in a downward direction so that each block is one pixel below the block to its left. The result is a rotation of the image through a small angle. There is a considerable simplification gained from not rotating the data within each block which results in a slight distortion of the image, but for small angles, this is not noticeable.

REFERENCES:
patent: 3976982 (1976-08-01), Eiselen
patent: 4168488 (1979-09-01), Evans
patent: 4267573 (1981-05-01), Chaikin
patent: 4271476 (1981-06-01), Lotspiech
patent: 4283765 (1981-08-01), Rieger
patent: 4481509 (1984-11-01), Sasaki et al.
patent: 4545069 (1985-10-01), Kermisch
patent: 4554638 (1985-11-01), Iida

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