MULTI-RESOLUTION DECOMPOSITION FOR ZOOMING BI-LEVEL IMAGES
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-16
One area of growing interest is the ability to send a printed document containing dithered (half-tone) images, such as in newspaper articles and reports, from a fax machine to a wireless device equipped with a monochrome or color LCD screen. Because the display resolution of small portable devices is expected to be much less than that used to repre- sent a fax document (1768x2288 pels) techniques for scrolling, panning and zooming will need to be employed to traverse the document. Dithered or half tone images in fax documents when zoomed start to lose their visual quality and sometimes are scarcely discernible. A method is proposed that allows zooming of images while actually improving the vis- ual quality ofthe zoomed image.