A ROI-BASED SEMI-FRAGILE WATERMARKING FOR IMAGE TAMPER DETECTION AND RECOVERY

A ROI-based semi-fragile watermarking technique for image tamper detection and recovery is proposed. In the proposed method, the image is divided into ROI and ROB regions first. The authentication watermark is constructed based on the ROI content and embedded back to the ROI region. Recovery information is obtained from ROI and embedded to the ROB region. If the ROI region is tampered, the tampered areas can be recovered from the information embedded in ROB. The unique features of our proposed method are it is robust to both the mild modification, such as JPEG compression, and malicious attacks, such as collusion attack and counterfeiting attack. Experimental results show that our algorithm is superior to the compared technique.