Image fragile watermarking algorithm capable of realizing accurate positioning of tampered region

Abstract

An image is easily tampered in certain application occasions, so that the real content of the image is hard to identify. Therefore, the content of the image is identified by means of tamper detection necessarily. The invention provides an image fragile watermarking algorithm capable of realizing accurate positioning of a tampered region based on discrete cosine transform. The method comprises the following steps: performing the discrete cosine transform on an original image in a partitioning way; adjusting the numerical value of the high-frequency coefficient of the image subblock discrete cosine transform to build the linear relationship of the numerical values between the two different discrete cosine transform coefficients of the same subblock; and obtaining a coefficient-adjusted image by means of the discrete cosine transform. When the content is identified, the tamper detection is realized by judging whether the set numerical value linear relation is existed between the two corresponding discrete cosine transform coefficients of each subblock of the tampered image by utilizing the reversibility of the discrete cosine transform, thus tamper detection is realized. The algorithm provided by the invention can be used for accurately positioning the tampered region of the image.

Description

An Image Fragile Watermarking Algorithm for Precise Location of Tampered Areas technical field The invention relates to the fields of image processing and information security. The invention designs an image fragile watermark algorithm capable of realizing precise positioning of tampered areas, and realizes the purpose of accurately authenticating image content. Background technique In some applications, images are easily tampered with, making it difficult to discern the true content of the image. Therefore, it is necessary to authenticate image content through tamper detection. Digital watermarking technology can not only realize the copyright protection of multimedia, but also realize the content authentication of multimedia. Multimedia content authentication refers to confirming whether the data is complete, whether it has been tampered with, whether it is authentic and whether the source is reliable. Fragile watermarking technology and semi-fragile watermarking tech...

AI Technical Summary

Problems solved by technology

In some applications, the image is easily tampered with, making it difficult to discern the real content of the image

Images