Patent ID: 8326016
Filing Date: 2012-12-04
Classification: H04N

Abstract:
1. A method of detecting tampering with check image information, comprising steps of: adjusting the time of a real-time clock circuit on a check processing device based on time synchronization information received from a host device; reading the front surface of the check by the check processing device to get check image information; reading magnetic ink character data from magnetic ink characters on the check by the check processing device; embedding the magnetic ink character data and the time output by the real-time clock circuit in the image information as a digital watermark by the check processing device; sending the digitally watermarked image information and the magnetic ink character data to the host device; storing the reception time at which the host device received the digitally watermarked image information; extracting the magnetic ink character data and the time from the digitally watermarked image information; and determining that the digitally watermarked image information and the magnetic ink character data have not been tampered with, if the extracted magnetic ink character data and the received magnetic ink character data match and the time difference between the extracted time and the reception time is within a prescribed time.