Cryptography plays an important role in Medical Images and its applications because of its ability to adapt to Encryption, Decryption and watermarking. Often, in this paper, to insure the medical information is secure. First of all use Scrambling algorithm to hide the patient information and require a authentication to access a real image. For watermarking, a Discrete Cosine Transform is applied to non- overlapping block size 8 x 8 image pixels. After that, a DCT coefficient values are apply to each block for position identification of embed message in medical image. To improve high capacity and imperceptibility in watermarking step, a Two Dimension Barcode ECC200 standard is used to convert message before embed to cover image. Experimental results demonstrate that the proposed scheme achieves better performance imperceptibility.
DCT, Digital watermarking, Two-dimensional data matrix bar, Encryption, Decryption