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Screen Designed for Imaging Problem From Defocus Lens

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.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0823110-132705
Date23 August 2010
CreatorsHuang, Ching-lun
ContributorsBen-sheng Chow, Shi-jr Lee, Tsung Lee
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0823110-132705
Rightsnot_available, Copyright information available at source archive

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