Rotation processing method of image and system therefor

Image analysis – Histogram processing – For setting a threshold

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340727, 364731, 382 57, G06K 932

Patent

active

049759779

ABSTRACT:
In an image data rotating system for applying rotation processing to input image data of a large picture plane, the image data is divided into rectangular small blocks and rotation processing is applied to the image data of each block. The rotation processing to the image data of each block is performed by first reducing in the x-axis direction and enlarging in the y-axis direction. Then the first oblique axis transformation is applied. Any error data between the real oblique axis and the image element found in the final raster of the corresponding region is held in a memory. Subsequently, the second oblique axis transformation in the y-axis direction is applied, and error data is held in similar manner. Error data held as the initial value for the rotation processing to the image data of the adjacent region block is used, thereby allowing the rotation of the image data of a large picture plane to an arbitrary angle to be executed at high speed.

REFERENCES:
patent: 4618991 (1986-10-01), Tabata et al.
patent: 4637057 (1987-01-01), Kermisch
patent: 4759076 (1988-07-01), Tanaka et al.
patent: 4829452 (1989-05-01), Kang et al.

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