Digital Watermarking Of Medical(DICOM) Images


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This project addresses authenticity and integrity of medical images using watermarking. Watermarking can be seen as an additional tool for security measures. As the medical tradition is very strict with the quality of biomedical images, the watermarking method must be reversible or if not, region of Interest (ROI) needs to be defined and left intact. Watermarking should also serve as an integrity control and should be able to authenticate the medical image.

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Digital Watermarking Of Medical(DICOM) Images

  1. 1. Digital Watermarking Of Medical Images (Project Presentation) Archana Rana(0809110016) Prashant Singh(0809110050) Rahul Chaudhary(0809110054) Ravi.K.Jaiswal(0809110059)
  2. 2.  Electronic trasnfer of sensitive data.  Need for security.  One of the option is Digital Watermarking.  What is Digital Watermarking ? - A digital watermark is a digital signal or pattern inserted into a digital document such as text, graphics or multimedia, and carries information unique to the copyright owner, the creator of the document or the authorized consumer. Introduction
  3. 3. Based on visibility of watermarks Based on the content to be watermarked Based on different image domains Digital Watermark Classification
  4. 4. Example: 1. Visible Watermark
  5. 5. 2. Invisible Watermark
  6. 6. ISSUES (i) Confidentiality - Access only to the authorised user. (ii) Reliability which focuses on two main aspects: a) Integrity - untampered and true data. b) Authentication – Recieved from an authenticated sender i.e. Unmodified image.
  7. 7.  To facilitate sharing and remote handling of medical images in a secure manner.  To provide a Lossless Watermarking method. Motivation
  8. 8. Three main objectives of watermarking in the medical domain are :  Information embedding without distorting the image.  Minimum perceptual degradation.  Information extraction without any loss. This would ultimately lead to Protecting medical images with watermarking. Objective
  9. 9. Literature study and survey of the state of art technology. Design , implement and test a) Capacity Selection in DCT and spatial domain b) Capacity Specification in DCT and spatial domain c) - Watermark Embedding (Encoding) in DCT and spatial domain d) -Watermark Extraction (Decoding) in DCT and spatial domain Design and implementation of graphical user interface Coding of each modules and testing Integration all the modules with Graphical user interface and testing. Scope
  10. 10. Basic Architecture :
  11. 11. 1. Region Characterisation. 2. Watermarking method selection. 3. Watermark Embedding. 4. Watermark Extraction. System Design:
  12. 12. 1. Region Charaterisation  We divide the host image into blocks of size 8X8.  SD is calculated for each block and are categorised into specific four region according to the following table:
  13. 13. 2. Watermarking method selection  According to the region categorisation done above, watermarking along with the payload capacity is selected from the following table:
  14. 14. 3. Watermark Embedding  Each block is watermarked with the selected watermarking method.  The four watermarking methods are: 1. DCT-1 bit. 2. DCT-2 bit. 3. LSB-1 bit. 4. LSB-2 bit.
  15. 15. LSB
  16. 16. DCT
  17. 17. DCT  Bringing an image into DCT domain
  18. 18. 4. Watermark Extraction  Same as above we use the selection table to categorise the blocks of watermarked image into the regions and the extraction is performed using the extraction algorithms for the above embedding methods.
  19. 19. Snapshots: 1. Home Screen
  20. 20. 2. View with the Input
  21. 21. 3. Output
  22. 22. We have been able to develop an effective system for watermarking a medical image without any loss of data. Conclusion Future Directions  Increase the hiding capacity.  Increasing the robustness.  Optimization.
  23. 23. 1. Janani Natarajan, Vijay R. Rathod, “Medical Image Watermarking Using a Perceptual Similarity Metric”, MIT International journal of Electrical and Instrumentation Engineering Vol- 1, No. 1, pp. 29-34, Jan(2011) 2 . Shinfeng D. Lin, Chin-Feng Chen, “A robust DCT-based watermarking for copyright protection”, IEEE Trans. Consumer Electron. 46 (issue 3) (oct 2000)pages 415–421. Wikipedia. Refrences