Effect of a spoke surface error on a phase mask in a computational imaging system |
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| Authors: | Chuan-Chung Chang Cheng-Chung Lee |
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| Affiliation: | 1. Department of Optics and Photonics , National Central University , Jhongli 320, Taiwan chuanchungchang@itri.org.tw;3. Department of Optics and Photonics , National Central University , Jhongli 320, Taiwan |
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| Abstract: | The effect of a spoke surface error on a phase mask in a computational imaging system was analyzed by combining the similarity of the point spread function (PSF) and the peak signal-to-noise ratio (PSNR) of de-convoluted images. The spoke surface error was applied on a phase mask with different peak-to-valley (P-V) values with various numbers of spoke rings in simulation. The minimum requirement of PSF similarity will be determined by a given PSNR threshold, which relates the defocus aberration. Finally, it can be concluded that a low-spatial frequency surface error is critical for a cubic phase mask in a computational imaging system with lower P-V error. |
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| Keywords: | surface error phase mask computational imaging |
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