The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 1989
Filed:
Jul. 05, 1984
Sang-Chul Kang, Irvine, CA (US);
Zoltan Z Stroll, Rancho Palos Verdes, CA (US);
Stephen C Miller, Costa Mesa, CA (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A simplified method for rotating a digital image through a small angle without the need for interpolation is described. The image is divided into small, square blocks, arranged in horizontal rows where each block is exactly to the left or right of the other blocks in the row, and into columns where each block in the column is offset to the right by one pixel with respect to the next higher block. The rotation is then accomplished by moving the lower rows to the left so that the columns are exactly vertical, and by moving the rightmost columns in a downward direction so that each block is one pixel below the block to its left. The result is a rotation of the image through a small angle. There is a considerable simplification gained from not rotating the data within each block which results in a slight distortion of the image, but for small angles, this is not noticeable.