The image hiding algorithm based on the mask matrix and DCT transform

Image encryption technology has a wide range of applications in protecting private information and trade secrets. The key information of carrier image can be saved by the mask matrix for information extraction, and the location of confidential information embedded can be decided by the mask matrix for information embedded. The Synthetic image embedded by the confidential information displayed as the carrier image, and the mass loss can´t be identified by the human eyes. The process to extract encrypted information is the reverse process of embedding. In this paper, the carrier image is a color image, and the secret image is a gray image. The psnr peak signal to noise ratio between synthetic image and carrier image is 57.74.