SCREEN TRANSMISSION SYSTEM, SCREEN TRANSMISSION SERVER, SCREEN TRANSMISSION METHOD, AND PROGRAM RECORDING MEDIUM

摘要

A differential region extraction unit (122) extracts a differential region according to screen data on a preceding screen and a current screen stored in a transmission screen data storage unit (124) and a screen data storage unit (121). A priority decision unit (123) calculates change information density indicating the pixel value change degree for each of the differential regions extracted by the differential region extraction unit (122). For example, when a user operates an icon on the screen, the change information density of the differential region corresponding to the icon is greater than the change information density of the differential region corresponding to the background portion of a dynamic image. An encoding unit (125) writes the screen code data in each of the differential regions into the transmission buffer (141) in the descending order of the change information density.