A New Watermarking Approach Based on Combination of Reversible Watermarking and CDMA in Spatial and DWT Domain

Image watermarking can be defined as a technique that allows insertion of imperceptible and indelible digital data into an image. In addition to its initial application which is the copyright, watermarking can be used in other fields, particularly in the medical field in order to contribute to secure images shared on the network for telemedicine applications. In this report we study some watermarking methods and the comparison result of their combination, the first one is based on the CDMA (Code Division Multiple Access) in DWT(Discrete Wavelet Transform) domain, noted CDMA-DWT and CDMA in spatial domain, noted CDMA-SD and their aim are to verify the image authenticity whereas the second one is the reversible watermarking (the least significant bits LSB and cryptography tools) , the reversible carte mapping RCM their objective are to check the integrity of the image and to keep the Confidentiality of the patient data. A new scheme of watermarking is the combination of the reversible watermarking method and the method of CDMA-DWT and the second is the combination of the reversible watermarking and the method of CDMA-sp to verify the three security properties Integrity, Authenticity and Confidentiality of medical data and patient information. In the end, we made a comparison between these method