Digital watermarking of images in wavelet domain
The explosive growth in the use of the Internet has made it an attractive medium for the distribution of multimedia material. However, it has become apparent that the digital nature of such material makes enforcement and proof of copyright ownership virtually impossible. Another problem with digital...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Published: |
2008
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/4393 |
| _version_ | 1811676489601515520 |
|---|---|
| author | Huang, Fu Jin. |
| author2 | Ang, Yew Hock |
| author_facet | Ang, Yew Hock Huang, Fu Jin. |
| author_sort | Huang, Fu Jin. |
| collection | NTU |
| description | The explosive growth in the use of the Internet has made it an attractive medium for the distribution of multimedia material. However, it has become apparent that the digital nature of such material makes enforcement and proof of copyright ownership virtually impossible. Another problem with digital images is that undetectable modifications can be made with very simple and widely available equipment. The research is to identify and develop a digital watermarking scheme that embeds an invisible digital watermark onto a still image without significantly affecting its image quality. A method based on the spatial frequency domain using Wavelet Transform (WT) algorithm is developed as a part of this project. The proposed scheme takes the Human Visual System (HVS) into consideration to reduce the visual distortion of the watermarked image. Multiple watermarks are embedded into the host image to improve the resilience to attacks and also to improve the reliability of watermark detection. A maximum of 9 watermarks are embedded into the different quadrants of wavelet coefficients. The amount of data hidden in the watermarked image depends on the amount of significant coefficients and background coefficients. These watermarks are embedded into different areas of different frequency bands. Thus, the resilience to both spatial and frequency image processing are improved. |
| first_indexed | 2024-10-01T02:22:17Z |
| format | Thesis |
| id | ntu-10356/4393 |
| institution | Nanyang Technological University |
| last_indexed | 2024-10-01T02:22:17Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | ntu-10356/43932023-07-04T15:18:55Z Digital watermarking of images in wavelet domain Huang, Fu Jin. Ang, Yew Hock School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems The explosive growth in the use of the Internet has made it an attractive medium for the distribution of multimedia material. However, it has become apparent that the digital nature of such material makes enforcement and proof of copyright ownership virtually impossible. Another problem with digital images is that undetectable modifications can be made with very simple and widely available equipment. The research is to identify and develop a digital watermarking scheme that embeds an invisible digital watermark onto a still image without significantly affecting its image quality. A method based on the spatial frequency domain using Wavelet Transform (WT) algorithm is developed as a part of this project. The proposed scheme takes the Human Visual System (HVS) into consideration to reduce the visual distortion of the watermarked image. Multiple watermarks are embedded into the host image to improve the resilience to attacks and also to improve the reliability of watermark detection. A maximum of 9 watermarks are embedded into the different quadrants of wavelet coefficients. The amount of data hidden in the watermarked image depends on the amount of significant coefficients and background coefficients. These watermarks are embedded into different areas of different frequency bands. Thus, the resilience to both spatial and frequency image processing are improved. Master of Science (Communication and Network Systems) 2008-09-17T09:50:38Z 2008-09-17T09:50:38Z 2000 2000 Thesis http://hdl.handle.net/10356/4393 Nanyang Technological University application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems Huang, Fu Jin. Digital watermarking of images in wavelet domain |
| title | Digital watermarking of images in wavelet domain |
| title_full | Digital watermarking of images in wavelet domain |
| title_fullStr | Digital watermarking of images in wavelet domain |
| title_full_unstemmed | Digital watermarking of images in wavelet domain |
| title_short | Digital watermarking of images in wavelet domain |
| title_sort | digital watermarking of images in wavelet domain |
| topic | DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems |
| url | http://hdl.handle.net/10356/4393 |
| work_keys_str_mv | AT huangfujin digitalwatermarkingofimagesinwaveletdomain |