ABSTRACT
This chapter presents an error-detection code-based active forgery detection mechanism which is realised using a block-level fragile. The fragile watermark embedding and forgery detection algorithms were tested on a large number of grayscale images. The outcome of this forgery detection scheme is formally a classification of the image blocks as tampered and pure which is further responsible for the localisation of the tampered regions when mapped on a map image. The chapter explains the essence of the various steps involved in this proposed fragile watermarking algorithm. It describes the pre-requisite topics of the work proposed here, including the concepts of cyclic redundancy check and logistic maps in brief. Watermarking scheme based on CRC-8 and logistic maps. The tamper detection and localisation algorithm is responsible for analysing the received image which was earlier known to have been watermarked. The performance of the watermark embedding procedure is analysed using parameters like Peak Signal to Noise Ratio, Structural Similarity Index and Entropy Measure.
