IMAGE DATA TRANSMISSION SYSTEM, IMAGE DATA TRANSMITTER AND ITS METHOD

摘要

PROBLEM TO BE SOLVED: To send image data efficiently via a network by transmitting transmission data with identification data denoting reduced amount data added thereto when the amount of the transmission data is small to an image data receiver. SOLUTION: A change detection section 236 decides an accumulated value of absolute values of differences of real color difference data, detects a change in the image and outputs the result of detection to an output control section 234. A subtractive color conversion section 226 reduces colors of the real image data (R, k-1) stored in an image storage section 222 to produce subtractive color image data (16, k-1). An image storage section 230 stores the received subtractive color image data (16, k-1), a difference calculation section 232 calculates a difference between the subtractive color image data (16, k-1) stored in the image storage section 230 and the real color image data (R, k-1) stored in the image storage section 222 to produce difference data (D') and outputs the data (D') to an input terminal (a) of the output control section 234.