Robust and Imperceptible Watermarking on Medical Images using Coefficient Pair Modification

Sensitive data including medical images and electronic patient records (EPR) have potential value in the era of big telemedicine applications. Distribution EPR over public networks requires a high level privacy security. Robust imperceptible watermarking techniques are needed to provide copyright preservation for protect information This paper improves technique Coltuc et al. by modifying discrete cosine transform (DCT) coefficient pairs watermark embedding formula. Our proposed formula ensures that difference between two coefficients is at least ????. If less than ????, then new pixels modified so equal The method was evaluated on variety images, X-ray, CT, US, MRI, Colonoscopy, compared numerous robust recent time. experimental results demonstrate suggested outperforms contemporary terms imperceptibility, robustness, peak signal noise ratio (PSNR) all modalities watermarked exceeds 54 dB, average PSNR approximately 56 dB. outstanding Coltuc's due 93% 14% increase bit error rate (BER) normalized correlation (NC), respectively. work superior various state-of-the-art techniques, allowing it be employed effectively ABSTRAK: Data sensitif termasuk imej perubatan dan rekod pesakit elektronik mempunyai potensi nilai dalam aplikasi besar teleperubatan. Pengedaran melalui rangkaian awam memerlukan tahap privasi keselamatan yang tinggi. Teknik penanda air mantap tidak dapat dilihat diperlukan untuk menyediakan pemeliharaan hak cipta melindungi maklumat pesakit. Kertas kerja ini menambah baik teknik dengan mengubah suai pasangan pekali transformasi kosinus diskret pembenaman tera air. Formula dicadangkan kami memastikan bahawa perbezaan antara dua adalah sekurang-kurangnya Jika kurang daripada maka piksel baharu diubah supaya perbezaannya sama Kaedah telah dinilai pada pelbagai perubatan, Kolonoskopi, dibandingkan banyak masa terkini. Keputusan eksperimen menunjukkan kaedah mengatasi teguh kontemporari dari segi ketidakjelasan, keteguhan keselamatan. Nilai semua modalitas bertanda melebihi purata lebih cemerlang kerana masing-masing peningkatan BER NC. Kerja unggul terkini, membolehkan ia digunakan berkesan perubatan.