Information Embedding and Authentication in Medical Images Using Least Difference Method
Department of Electronics and Communication Engineering, BBSBEC, Fatehgarh Sahib, Punjab, India
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Digital image watermarking is proposed to overcome the problems of security, integrity in health care departments and that of defense personnel’s as well as employees of national security agencies. Medical images, unlike most of images, require extreme care when embedding informatory information while embedding process because the additional information must not affect the image quality and readability of the required portions need to be diagnosed. In order to overcome any misdiagnose caused by embedding data into medical images, lossless data hiding techniques have been developed. This paper presents a lossless semi-reversible watermarking technique for DICOM images which works in semi reversible domain. This technique can embed high capacity of textual data in an image in noisy pixels of the image. It uses the technique of minimum value difference in characters integral value and the pixels of the image and finds the matching on least difference basis. There is no overlapping in the embedded data, hence full recovering of information at receivers end. It can be used to hide patient's data hiding and protecting the region of interest (ROI) with tamper detection and recovery capability. The experimental results show that the original image can be exactly extracted from the watermarked one in case of no tampering. In case of alterations, made in the transmitted medium by an unauthorized person, it is able to detect and locate them in the images.