State of Art Technique that Accomplishes Digital Image Protection and Self Recovery

Recently watermarking algorithm plays an important role in image forensics. One of the main applications is protect—ion of images against tampering. An algorithm that full-fills two purposes has to be designed that includes: 1) detection of tampered area of received image and 2) information recovery in the tampered zones. These tasks using watermarking are accomplished by state-of-the-art techniques that consist of check bits and reference bits. Check bits are used for tampering detection, while reference bits carry information about the whole image. The problem of recovering the lost reference bits can be modeled and dealt with as an erasure error. The reference bits can be protected against tampering by an appropriate design of channel code. The total watermark bit-budget is dedicated to three groups in the present proposed method: 1) source encoder output bits 2)channel code parity bits and 3)check bits. The original image is source coded and using appropriate channel encoder the output bit stream is protected in the watermark embedding phase. To retrieve the original source encoded image, erasure locations detected by the check bits help in image recovery. The image quality of both the watermarked and recovered image significantly outer-performs recent techniques as shown by the experimental results. By spending less bit-budget less bit-budget the watermarked image quality gain is achieved, where the consequence of consistent performance of designed source and channel codes result in considerably improved quality of recovered image.