Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Multi-disciplinary Studies | en_US |
| dc.creator | Chan, Hei-ping | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/2312 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | Multiscale tomographic reconstruction by wavelet transform | en_US |
| dcterms.abstract | The filtered back-projection is the most commonly used method for reconstructing image from tomographic projection, however, the reconstructed image is not acceptable if the projection data is noisy. In this project, the problem of reconstructing an image from tomographic projection will be approached by using the wavelet based multiresolution method. By employing this method, we can construct an image depend on how fine the image detail we are interested. The first part of the work is to combine the conventional filtered back-projection (FBP) reconstruction method and the standard discretization technique to form a discrete version of the FBP reconstruction method. Based on the multiresolution analysis, an 1-D wavelet transform based multiscale decomposition is then applied, and a multiscale FBP algorithm is formed. From this algorithm, a series of multiscale approximated and detail images are generated. These reconstructed images are then examined. After that, we investigate how a gaussian white noise corrupts the quality of the reconstructed image by employing a multiresolution approach. Finally, a denoising technique based on the wavelet transform domain filtering and cycle spinning is developed, which is applied to filter the white noise in the reconstructed images. | en_US |
| dcterms.extent | v, 88 leaves : ill. ; 30 cm | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 1996 | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.LCSH | Wavelets (Mathematics) | en_US |
| dcterms.LCSH | Tomography | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b12306915.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.78 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/2312