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:
Jun. 10, 1997
Filed:
May. 14, 1993
Well-Chen Chua, Taipei, TW;
Lie-Der Lin, Taipei, TW;
Shih-Pao Sun, Tainan, TW;
Cheun-Song Lin, Taichung, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A bit-reversing method and system are disclosed for linearly scaling an image frame horizontally, vertically or both. The system includes a counter circuit for outputting the current frame-column number of the currently scanned pixel and the current frame-row number of the currently scanned frame-row. The numbers are bit reversed in a converter circuit. The bit-reversed current frame-column number is compared in a comparator circuit to a horizontal scaling constant which equals the number of pixels to be discarded in each frame-row of the image frame. The bit-reversed current frame-row number is compared in the comparator circuit to a vertical scaling constant which equals the number of frame-rows of the image frame to be discarded. If the bit-reversed current frame-row number is greater than the vertical scaling constant then the comparator circuit outputs appropriate signals to a scaling controller and an address generator for storing the currently scanned frame-row in a frame buffer. Otherwise, the comparator circuit outputs appropriate signals for discarding the currently scanned frame-row. Likewise, if the bit-reversed current column number is greater than the horizontal scaling constant, the comparator circuit outputs appropriate signals to the scaling controller and address generator for storing the currently scanned pixel in the frame buffer. Otherwise, the comparator circuit outputs appropriate signals for discarding the currently scanned pixel.