In the imaging system, a blurred defocus image is a common problem.
This is because different objects in the scene need different focus for imaging clearly. Background¡¦s focus distance is different to the objects.
However, we can only have one focus distance in one picture. Therefore, the images of the other objects in different focus distance would be blurred by the faulty focuses.
We solve the above defocus problem by wave front coding. Wave front coding is a technique that adds a phase mask in front of the lens, changing the image performance.
In this thesis, we used a ring phase screen, computed accordingly its optical transfer function and then simulated the resulting images. We compared with other phase screens provided by other researchers for different defocus situations. From our simulated images and OTF results, our ring phase pupil is slightly superior.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0823110-132705 |
| Date | 23 August 2010 |
| Creators | Huang, Ching-lun |
| Contributors | Ben-sheng Chow, Shi-jr Lee, Tsung Lee |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0823110-132705 |
| Rights | not_available, Copyright information available at source archive |
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