Patent ID: 6643415
Filing Date: 2003-11-04
Classification: G06T

Abstract:
An image data rotating method comprising the steps of:using an image memory capable of storing pixels in same number as square of a maximum number among number of pixels per one line of each of image data with a plurality of sizes to be rotated and number of lines to be rotated; number of pixels and number of lines in the same number as one of common divisors of said number of pixels per line and said number of lines being unit number of pixels and unit number of lines in the process writing or reading said image data in or from said image memory; for consecutive two pages in image data with the same size of a plurality of pages to be rotated, reading all pixels of image data in a former page written in said image memory from each storage area at each address of said image memory in a predetermined order of reading according to an angle to be rotated by said unit number of pixels for one line and by said unit number of lines for all lines; and writing all pixels of image data in the latter page in the same storage area at the same address of said image memory in said predetermined order by said unit number of pixels for one line and by said unit number of lines for all lines.