A study of watermarking methods in medical application
Nowadays, watermarking technology is playing an important role in medical image watermarking as it can hide the patient information and then get back the information by the owner itself using certain private key. The objective of this project is to address the specific requirements needs for w...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2004
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8165/1/24p%20NG%20LEE%20PING.pdf http://eprints.uthm.edu.my/8165/ |
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| Institution: | Universiti Tun Hussein Onn Malaysia |
| Language: | English |
| Summary: | Nowadays, watermarking technology is playing an important role in medical
image watermarking as it can hide the patient information and then get back the
information by the owner itself using certain private key. The objective of this
project is to address the specific requirements needs for watermarking of medical
images and compare three appropriate schemes for watermarking of medical
images. Four important requirements in medical image watermarking are
imperceptible watermarking, integrity control, authentication and capacity hiding.
The three methods of medical image watermarking that have been studied are
Least Significant Bit (LSB), Rivest, Shamir and Adleman (RSA) encryption and
decryption with LSB, RSA encryption and decryption with feature-based. These
three methods of image watermarking are categorized in spatial domain.
Performance for watermarking scheme is carried out and comparisons are made.
There are three quality metrics used in this project which are Peak-to-Noise Ratio
(PSNR), Mean Square Error (MSE) and Signal-to-Noise Ratio (SNR). Among
these three methods, LSB method has the most capacity of watermark and fastest
rate in embedding process. These three algorithms implemented in this project are
shown to be sensitive for the attack. Attacks applied in this project are salt &
pepper noise with 0.0001 noise density, median filtering, JPEG compression with
index 100 and index 75, cropping and rotation. These three methods that being
studied are better for integrity control. Meanwhile, a Graphic User Interface (GUI)
is developed for embedding and extracting purpose. User can embed a watermark
into their host image and extract the watermark from the watermarked image. |
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