Displacement JPEG (joint photographic experts group) double-compression tampering blind detection method based on condition symbiotic probability matrix

Abstract

The invention relates to a displacement JPEG (joint photographic experts group) double-compression tampering blind detection method based on a condition symbiotic probability matrix. The method comprises the steps: firstly, carrying out differential and thresholding treatment of horizontal, vertical, main diagonal and secondary diagonal directions on an amplitude matrix of a discrete cosine transform coefficient quantified by a JPEG; then modeling the four thresholding differential matrixes by the condition symbiotic probability matrix; selecting an element of the condition symbiotic probability matrix as characteristic data, and carrying out dimension reduction treatment on the characteristic data by principal component analysis; and finally, judging whether an image block is subjected to displacement JPEG double-compression through a support vector machine technology. An experiment shows that the method has obvious advantages compared with the existing algorithm when the image block is small, so that the practicability of the displacement JPEG double-compression tampering detection is greatly improved, and good foundation is established for further development of the digital image forensics field.

Description

Technical field [0001] The invention relates to an image tampering detection method, in particular to a shifted JPEG double compression tampering blind detection method based on a conditional co-occurrence probability matrix. Background technique [0002] With the rapid development of Internet technology, high-performance image acquisition equipment and intelligent image processing software, it has become easy to tamper with the content of an image without leaving any traces. In fact, the authenticity of digital images is already very serious, and sometimes malicious tampering may even bring us legal disputes. Therefore, the authenticity of digital images is of great significance in the fields of judicial authentication and copyright protection. For digital image forensics technology, it can be divided into two major categories, namely, active and passive forensics methods. The active forensics method is to embed the digital watermark or digital signature into the digital image...

AI Technical Summary

Problems solved by technology

However, when the image patches are small, their detection accuracy is still relatively low

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