A system and method of transmitting an image adapted to a first display area size, such as a standard computer screen having a particular pixel-by-pixel resolution, to an apparatus having a smaller second display area size by scaling the image through coefficient cropping its frequency domain representation....http://www.google.com.hk/patents/US6882755?utm_source=gb-gplus-share專利 US6882755 - Image transmission for low bandwidth with region of interest
