Algorithm for tampering detection of mosaic images based on the characteristics of color filter array

Abstract

The tamper detection method of spliced ​​images based on the characteristics of the color filter array disclosed by the present invention comprises the following steps: Step 1, preprocessing the image to be detected into multiple image blocks; Step 2, estimating the original image mode; Step 3, Using edge detection operator to detect tampering location. The mosaic image tampering detection method based on the characteristics of the color filter array of the present invention uses the change or difference of the periodic correlation mode between image pixels introduced by the color filter array interpolation to detect the mosaic image tampering, which can not only detect whether the image is have been spliced ​​and tampered, and can detect the position of the tampered area; in the tampering location stage, the introduction of the Canny operator makes the algorithm have a higher tampering location accuracy, that is, it can accurately locate the edge of the tampered area, and effectively simulate False edges are suppressed; image processing operations that maintain content, such as JPEG compression, different types of filtering, and noise processing, have better robustness.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a method for detecting tampering of spliced ​​images based on the characteristics of a color filter array. Background technique [0002] During the rapid development of digital imaging technology, digital photos are applied in all aspects of our lives. However, the wide application of various image processing software can conveniently perform some processing operations on images, such as partial modification, splicing, retouching and other computer processing, which makes tampering with images ubiquitous, causing the content authenticity of digital images to change. It is no longer reliable and cannot be used as strong evidence in some legal cases, news media, scientific research results, medical diagnoses, and financial events. Therefore, how to detect the authenticity of digital image content has become an important hot issue and a difficult problem to be ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a mosaic image tampering detection method based on the characteristics of the color filter array, which solves the problems in the prior art that the mosaic image area cannot be accurately located and the algorithm is not robust, and it can accurately locate the mosaic image. Fake digital image regions and be robust to content-preserving image processing operations such as JPEG compression, noise addition, filtering, gamma correction, etc.

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