A Study And Analysis Of Watermarking Algorithms For Medical Images
| dc.contributor.author | Al-Qershi, Osamah Mohammed Abdo | |
| dc.date.accessioned | 2018-06-26T06:46:49Z | |
| dc.date.available | 2018-06-26T06:46:49Z | |
| dc.date.issued | 2010-12 | |
| dc.description.abstract | Digital watermarking techniques hide digital data into digital images imperceptibly for different purposes and applications such as copyright protection, authentication, and data hiding. One of the objectives of health care management systems is to securely archive patients’ records. Moreover, these records may require very large media capacity to store, long time to transmit, and consequently incur higher cost. Classical encryption technology is an important tool that can be used to protect data transmitted over computer networks but it does not solve all digital data protection problems. Digital watermarking is an emerging technology for digital image authentication. It is proposed to overcome the problems of authentication, capacity and cost as the watermarking schemes can be used to store different medical records such as graphs, text, etc. This eliminates storing separate data files along with the medical images. In this thesis, four digital watermarking algorithms were proposed for medical images. The first two algorithms are reversible and can be used for data hiding application. The proposed two algorithms showed high embedding capacity with very good visual quality. The third algorithm is a reversible algorithm with authentication, tamper detection, and recovery facilities. The algorithm showed good performance in terms of hiding capacity and visual quality. Also the proposed algorithm could authenticate the watermarked images. In case of tampering, the proposed algorithm could detect the tampered areas and even recover those areas in some cases. The fourth algorithm is a hybrid algorithm with authentication, tamper detection, and recovery facilities. The results showed good performance in terms of the ability to store patient’s data and visual quality. Also the authentication and tamper detection facilities were tested same as in the third proposed algorithm. In addition, the algorithm showed some robustness against certain types of noise such as salt and pepper and cropping. The general performances of the four proposed algorithms depend on the modality of the image undergone watermarking. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/5784 | |
| dc.language.iso | en | en_US |
| dc.publisher | Universiti Sains Malaysia | en_US |
| dc.subject | A study and analysis of watermarking | en_US |
| dc.subject | algorithms For medical images | en_US |
| dc.title | A Study And Analysis Of Watermarking Algorithms For Medical Images | en_US |
| dc.type | Thesis | en_US |
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