Restoration for Images Blurred by Defocus Lens

• Main Authors: Chien-Ming Lai, 賴建名
• Other Authors: Ben-shung Chow
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/74cjz7

碩士 === 國立中山大學 === 電機工程學系研究所 === 97 === 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. 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 apply wave front coding to solve the above defocus problem. Wave front coding is a technique that adds a phase mask in front of the lens, changing the image performance, and solving the problem of defocus. In this thesis, we used a new 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 results, our pupil and optical transfer function are slightly superior.