Detection and restoration of tampered JPEG compressed images
To protect the integrity of digital images, our scheme proposes a technique based on standard JPEG still image compression. The proposed scheme can detect tampered images and can also recover them. Images are compressed using the JPEG compression technique, and the proposed scheme also incorporates an edge detection technique. First, the edge detection technique identifies the edges of the image before image compression takes place. The obtained edge characteristic is then embedded into the image immediately after compression. If the image is tampered during transmission, the embedded edge characteristic can be used to detect the tampered areas, and these tampered areas can be reconstructed using the interpolation method and the embedded edges. Therefore, the proposed scheme allows recipients to know that the image has been tampered with during transmission.