Watermarking berbasis Redundant Discrete Wavelet Transform dan Arnold Transform pada Citra Medis

Ledya Novamizanti(1), Irma Safitri(2), Hafizhan Bhamakerti Arindaka(3), Iwan Iwut Tritoasmoro(4),

DOI: https://doi.org/10.15294/jte.v13i2.31691


(1) Telkom University
(2) Telkom University
(3) Telkom University
(4) Telkom University

Abstract

In telemedicine, data transmission in digital medical images and electronic medical records through the internet is vulnerable to various threats of theft and manipulation. Image watermarking is needed to provide authentication and security to medical images. This paper proposes an image watermarking scheme based on Redundant Discrete Wavelet Transform (RDWT) and Discrete Cosine Transform (DCT) with watermark encryption using Arnold transform. First, the original host medical image was decomposed into four subbands using RDWT. Then, DCT is applied to the LH subband of the RDWT. On the other hand, the watermark is scrambled using Arnold transform to ensure identity security. The singular value of the watermarked image is obtained by modifying the singular value of the host image and the watermark. Tests were carried out on different medical images, namely X-ray, MRI, CT, and ultrasound, with a watermark in a proprietary logo. The host medical image is the same size as the watermark image. The result of this study can provide high authentication, imperceptibility and security in medical images, with an average PSNR value of 65.67 dB, SSIM 1, BER 0, NC 1. This scheme is resistant to JPEG compression, noise addition, filtering, image sharpening, image enhancement, geometric operations, motion blur, image sharpening, and histogram equalization.

Keywords

medical image; watermarking; RDWT; DCT; SVD; Arnold transform

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