System for performing rotation of pixel matrices

Details System for performing rotation of pixel matrices System for performing rotation of pixel matrices

1995-07-31

1997-09-16

Tung, Kee M.

Computer graphics processing and selective visual display system

Computer graphic processing system

Interface

345437, 345501, 345126, G06F 1300

Patent

active

056689802

ABSTRACT:
The invention relates to a method for rotating a source pixel matrix to provide a rotated destination matrix. The method operates on a computer system which includes a processor, a memory and a temporary storage portion. The temporary storage portion includes a plurality of rows where each row includes a plurality of storage locations. The method includes the steps of loading a first set of rows of the temporary storage portion with a lower portion of the source pixel matrix, loading a second set of rows of the temporary storage portion with an upper portion of the source pixel matrix, skewing the source pixel matrix loaded in first and second sets of rows to provide a skewed pixel matrix, alternately rotating selected portions of the skewed pixel matrix stored in selected rows of the first and second sets of rows horizontally and vertically to provide a rotated pixel matrix, and unscrambling the rotated pixel matrix to provide the rotated destination matrix.

REFERENCES:
patent: 5111192 (1992-05-01), Kadakia
patent: 5361339 (1994-11-01), Kadakia et al.
patent: 5365601 (1994-11-01), Kadakia et al.

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