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Rotating Image Data Disclosure Number: IPCOM000070332D
Original Publication Date: 1978-Sep-01
Included in the Prior Art Database: 2005-Feb-21

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Related People

Abraham, DG [+details]


Fig. 1 shows a typical document and the direction of orientation of scan lines used by a typical scanner. Fig. 2 shows the same document as a printer would output it from an image processing system. It is advantageous to rotate the image as soon as possible after scanning in order to more easily process the data. Further, once rotated, the data is now grouped by output lines instead of scans and "makes more sense" when dealing with it. Once the data has been rotated, the relationships shown in Fig. 3 and Fig. 4 exist. In this example, a 4-bit byte has been chosen arbitrarily. Fig. 3 divides the document into N scans and lines A - Last. Scanning is bottom to top and right to left. The data as it appears in storage is shown in Fig. 4.