Digital watermark-based electronic bill image anti-tamper method

Abstract

The invention relates to the field of computer image processing, and provides a digital watermark-based electronic bill image anti-tamper method. The method comprises the following steps of: encrypting digital watermark information and embedding the encrypted digital watermark information into a low-frequency coefficient of a gray scale component of an electronic bill image to be transmitted; extracting the digital watermark information from the received electronic bill image, decrypting the acquired information by using a private key and reconstructing a watermark pattern; and comparing the original watermark pattern with the detected watermark pattern to judge whether the electronic bill image is tampered or not. By the method, the visual effect of a bill is not influenced, the passwordof the bill cannot be leaked, image compression and gray scale processing can be effectively withstood, and the electronic bill image can be effectively prevented from being tampered.

Description

technical field [0001] The invention relates to the field of computer image processing, in particular to a digital watermark-based anti-tampering method for bill electronic images. Background technique [0002] With the advancement of financial informatization and the development of the Internet and e-commerce, electronic payment methods are increasingly valued by the financial industry, and are gradually becoming one of the important payment methods. Among them, the check image exchange system is an important part of electronic payment. Through this system, image information transmission will replace the delivery of physical bills, so that bills can be used across banks and regions. The application of this system will greatly improve the efficiency of payment settlement and bill retention, reduce the time lag and delivery cost of physical bills due to geographical obstacles, and meet the growing settlement service requirements of economic entities. [0003] But at the sam...

AI Technical Summary

Problems solved by technology

[0004] The traditional encryption technology is to encrypt in the channel of the electronic image transmission of the bill, not on the electronic bill itself. This encryption technology loses its encryption effect after the transmission terminal is decrypted, and cannot guarantee the security of the bill content.

In addition, cryptographic methods also have inherent deficiencies in the protection of electronic image documents. Cryptographic encryption is a "zero-tolerance" encryption that does not allow any distortion. However, the transmission of electronic images of documents may vary depending on actual needs, such as Due to the limitation of transmission speed and storage size, it is possible to do certain lossy processing on the bill, such as grayscale or lossy compression, so the verification of its authenticity requires a certain degree of tolerance

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