Publication: Watermarking of medical images using error control coding.
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Date
2006-05
Authors
Ng, Kah Guan
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Abstract
Digital watermarking is a technique of hiding specific identification data for copyright authentication such as audio, image, video or text. A digital signature or digital watermark is embedded in the host media. This technique is adapted in this project for interleaving patient information with medical images. In medical images, ROI (Region Of Interest) is an area which contains important information and must be stored without any distortion. We propose a digital watermarking method which avoids the distortion of the image data in ROI by embedding signature information into other area then ROI. More specifically, we adopt an Error Control Coding (ECC) technique to generate the text information, which makes it possible to detect and correct errors introduced in extracted text from noisy watermarked image. The text file data is encrypted so as to maintain the security and encoded with ECC. The Number Of Characters Altered (NOCA) and Bit Error Rate (BER) is determined for de-interleaved and decrypted text information. It is found that compared to uncoded system performance, coded system are more reliable. Meanwhile, a Graphical User Interface (GUI) is developed in this project for embedding and extracting purpose. User can embed watermark into selected image and extract the watermark from the watermarked image.