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Improved Alpha Blending Algorithm for the Authentication of Medical Images Using LWT and QR Code

Kavitha K. J., Priestly B Shan

Abstract



Telemedicine is widely practicing applications in the field of healthcare system because of its easiness in accessing the patient detail without wasting much time and money. National Health Portal in India is about to launch ‘Myhealthrecord’ (MHR) to store and access prescriptions, laboratory test results, medical images and wellness related information of patient’s with the help of Information technology. With this development, protecting MHR becomes a challenging task for the health organizations being stolen by the fraud to make illegal money. Many measures may be taken by the Government to avoid such cases. In that case, Digital watermarking (DWM) techniques may play a major role to claim authenticity and assure security to the MHR of a person. Although many DWM techniques are developed, no complete algorithm is available to make this technique robust. Hence still DWM remains an open research for the scientists. In this paper an approach of digital watermarking is proposed to enhance the security to the n-dimensional medical images (MI) along with other details of MHR. In this paper, Digital watermarking technique based on LWT and alpha blending algorithm is proposed for MI to enhance the security, authenticity while maintaining the perception of the watermarked image as that of the original medical image transmitted. A modified alpha blending embedding and extraction method is proposed to make the system more robust and QR code of a MHR is used as watermark and a secret key is incorporated to increase the security. The proposed technique is applied to 2-D and 3-D MI and subjected to various attacks and then the performance of the system is evaluated. The experimental result shows that, the efficiency of the proposed system increased in terms of the quality metrics PSNR, average square error, Correlation coefficient and absolute error. With the use of modified alpha blending algorithm and secret key, the system robustness is increased and QR code together with the secret key increases the security.

Keywords


DWM, QR code, Alpha blending algorithm.

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