Prajanto, Wahyu Adi (2014) Digital Image Steganography Based On Integer Haar Wavelet Transform And Coefficient Difference. Masters thesis, Universiti Teknikal Malaysia Melaka.
![[img]](http://eprints.utem.edu.my/style/images/fileicons/text.png) |
Text (24 pages)
Digital Image Steganography Based On Integer Haar Wavelet Transform And Coefficient Difference 24 Pages.pdf - Submitted Version Download (362kB) |
|
Text (Full Text)
Digital Image Steganography Based On Integer Haar Wavelet Transform And Coefficient Difference.pdf - Submitted Version Restricted to Registered users only Download (4MB) |
Abstract
The development of digital information led to the demand for information security technology that protects the confidentiality of information. Digital steganography is one of such technology that able to protect the information from illegal interception due to its capability to hide the existence of the information without attracting the eavesdropper‟s attention. Among digital media, digital image is the most widely used media for steganography. Discrete Cosine Transform (DCT) is a well-known technique in digital image steganography, but the block calculation of DCT may pose artifact on the images. The disadvantages of DCT can be eliminating by the Discrete Wavelet Transform (DWT) which is more compatible with the Human Visual System (HVS). However the floating point of DWT can causes loss of information. On the other hand, Integer Wavelet Transform (IWT) is represented in finite precision numbers, which can avoid the problem of floating point precision of DWT. In this study, the messages are embedded on the wavelet coefficients of 1-level Integer Haar Wavelet Transform (IHWT) using Coefficient Difference scheme that adopted from Pixel Value Differencing (PVD). The messages are embedded on the difference value of two adjacent wavelet coefficients. Peak Signal to Noise Ration (PSNR) and Structural Similarity (SSIM) are used to measure the quality of stego image. The result shows that the proposed method has outperformed the existing method that employ IHWT and Pixel Mapping Method (PMM) in term of capacity vs. imperceptibility, as well as the maximum capacity. This is due to the high degree of Coefficient Difference that can tolerate larger modification of wavelet coefficients. Moreover, the Coefficient Difference can be applied on all coefficients instead of either significant or insignificant coefficient. These lead to the both high capacity and imperceptibility of digital image steganography system.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Image processing, Digital techniques, Computer security, Computer networks, Security measures |
| Subjects: | T Technology > T Technology (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Library > Tesis > FTMK |
| Depositing User: | Nor Aini Md. Jali |
| Date Deposited: | 12 Apr 2016 04:05 |
| Last Modified: | 16 Feb 2022 12:29 |
| URI: | http://eprints.utem.edu.my/id/eprint/16217 |
| Statistic Details: | View Download Statistic |
Actions (login required)
 |
View Item |