Color image authentication with tamper detection and remedy based on BCH and Bayer Pattern

This paper proposes a new color image authentication scheme, aiming at tamper detection and recovery, based on error correction coding and Bayer Pattern. The bit stream generated by coding an image block with BCH (15, 7) is treated as the authentication information while the Bayer Pattern technique is adopted to achieve tamper remedy. The service of tamper remedy is valuable in saving the bandwidth of image re-transmitting, seldom addressed in existing image authentication schemes. The experimental results show the performance in sensitive integrity detection, accurate localization and imperceptible remedy. Security of image authentication techniques is achieved only when the false positive/negative probability is taken into consideration as well as guaranteeing detection, localization and remedy. In the end, the security of the present scheme is analyzed.

► The proposed scheme adopts BCH(15, 7) technique to ensure integrity of images.
► Localization accuracy of block-based authentication is bound by the block size.
► It approximately recovers a tampered image with satisfactory image quality.
► It introduces imperceptible distortion to the protected color images.