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.
Highlights
Abstrak— Pada telemedicine, transmisi data berupa citra medis digital dan rekam medis elektronik melalui jaringan internet rentan terhadap berbagai ancaman pencurian dan manipulasi
This paper proposes an image watermarking scheme based on Redundant Discrete Wavelet Transform (RDWT) and Discrete Cosine
“Biometric-based efficient medical image watermarking in E-healthcare application,” vol 13, pp
Summary
Teknologi telemedicine berperan penting dalam perkembangan aplikasi medis. Melaporkan gabungan dari metode Discrete Wavelet Transform (DWT), Dicrete Cosine Transform (DCT), dan SVD untuk memberikan kompromi yang sangat baik antara imperceptibility dan ketahanan terhadap beberapa serangan. Metode watermarking berbasis DWT umum digunakan karena sifat lokalisasi frekuensi spatio yang sangat baik sehingga dapat membantu menemukan area di citra host untuk menanamkan watermark secara tidak terlihat. Mengusulkan komponen reflektansi citra host medis diperoleh dengan menggunakan Homomorphic Transform, dimana dekomposisi RDWT dan SVD diterapkan. Teknik watermarking citra medis yang diusulkan mengeksploitasi properti yang menguntungkan dari RDWT, DCT, dan SVD. Tujuan utama dari skema yang diusulkan adalah untuk merancang teknik watermarking citra medis sedemikian rupa sehingga integritas watermark tidak rusak. Kelebihan utama dari teknik yang diusulkan adalah mencoba meminimalkan pencurian RME karena menggunakan citra medis dengan watermark untuk menjamin keamanan
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