Method for rotating a binary image

Details Method for rotating a binary image Method for rotating a binary image

1983-12-30

1986-12-02

Eng, David Y.

Boots, shoes, and leggings

382 46, G06F 700, G06F 1562, G06K 936

Patent

active

046270205

ABSTRACT:
A method for rotating an image by 90 degrees includes the steps of: storing the image in a raster format arranged in r rows by c columns, image information in each row being stored in a number of bytes, each byte having b bits, there being c/b bytes in each row of the raster format; moving a block of the image into a temporary storage, there being r rows by v columns in the block; separating each image block into groups of bytes of rotatable size; determining for each group if all bits are the same value; rotating each group that does not have all bits the same value; storing each rotated group in an output area of the raster storage; repeating the above steps for all remaining blocks of the image.

REFERENCES:
patent: 4168488 (1979-09-01), Evans
patent: 4245321 (1981-01-01), Gennetten
patent: 4267555 (1981-05-01), Boyd et al.
patent: 4271476 (1981-06-01), Lotspiech
Morrin, "Rotation of Images Using Contour Compressed Data", IBM Technical Disclosure Bulletin, vol. 18, #8, Jan. 1976, pp. 2640-2642.

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