Watermark embedding and authentication method for png electronic invoice image based on block classification

Abstract

The invention discloses a watermark embedding and authentication method for PNG electronic invoice image content protection. It is divided into key class, uniform class and non-uniform class; the content of the image blocks of the three components of RGB is encrypted respectively to generate watermark information, and the corresponding watermark embedding position is selected according to the different types of the component image blocks; the watermark is reconstructed by comparing the image blocks and the The consistency of the extracted watermark is used to judge the authenticity of the image block, and the horizontal neighborhood extension detection method is used to further improve the tamper detection performance. While ensuring that the watermark is invisible, the method increases the size of PNG images less; it has high detection accuracy for tampering, low false detection rate, and can effectively resist tampering such as replacement, addition, deletion, and collage.

Description

technical field [0001] The invention relates to a method for digital watermark embedding and tampering detection of a PNG electronic invoice image, which is used to verify the authenticity and integrity of the content of the electronic invoice. Background technique [0002] The "Online Invoice Management Measures" promulgated by the State Administration of Taxation came into effect on April 1, 2013, requiring all invoice-issuing units and individuals to issue online invoices to consumers. When the current online invoice is used as a financial accounting voucher, it is still necessary to print the electronic invoice on "specific paper". That is to say, the units and individuals that issue invoices still need to send the printed paper invoices to consumers by express, resulting in a waste of manpower and material resources. To this end, in June and December 2013, my country began to pilot electronic invoices in Beijing and Shanghai. If electronic invoices can be used as fina...

AI Technical Summary

Problems solved by technology

However, during image authentication, by comparing the consistency between the reconstructed watermark and the extracted watermark, only one image block will actually be tampered, but other associated image blocks will also be judged as tampered blocks, resulting in false detection.

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