Performance Comparison of Semifragile Watermarking Methods for Image Authentication
Data authentication is one of the primary requisites in present day communication systems. In image processing, data authentication is implemented by using watermarking techniques. The specific interest in semifragile watermarking algorithms arises from the multitude of practical and commercial applications, where content needs to be strictly protected, but the exact representation during exchange and storage need not be guaranteed. The alterations on the documents can occur unintentionally or can be implanted intentionally. Semifragile watermarks are more robust and less sensitive to classical user modifications such as JPEG compression, content-preserving operations and content altering manipulations while sensitive to content integrity verification.