Method for detection of image tampering and partial recovery

In this paper, the problems of detection of unauthorized changes to the content of a digital image, determination of distorted parts and partial recovering of the content from the damaged parts, are considered. most types of image tampering are based on the well known operations of Copy-Paste, Copy-Move or their combinations. In many investigations the basic approach for tamper detection is based on creating a watermarking procedure in such a way that the type and parameters of distortion of the watermark from an attack allow to make an inference on the presence of a fraud, to locate the damaged parts of the image and even to recover them. In this paper, a watermarking algorithm is used, which allows manipulations over the images at different ratios of sizes of image-container and watermark. Different schemes of protection from fraud and recovery of distorted parts of an image are suggested. The effectiveness of suggested schemes and algorithms is shown by means of numerical experiments.