Digital decoding design for phase coded imaging system

Po-Chang Chen; Chih-Hao Liu; Chir-Weei Chang; Chuan-Chung Chang; Ludovic Angot

doi:10.1117/12.825459

2 September 2009 Digital decoding design for phase coded imaging system

Po-Chang Chen, Chih-Hao Liu, Chir-Weei Chang, Chuan-Chung Chang, Ludovic Angot

Proceedings Volume 7443, Applications of Digital Image Processing XXXII; 74431A (2009) https://doi.org/10.1117/12.825459
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

This paper develops a digital decoding design for the imaging system with phase coded lens. The phase coded lens is employed to extend the depth of filed (DoF), and the proposed design is used to restore the special-purpose blur caused by the lens. Since in practice the imaging system inevitably contains manufacturing inaccuracy, it is often difficult to obtain precise point spread function (PSF) for image restoration. To deal with this problem, we develop a flow for designing filters without PSF information. The imaging system first takes a shot of a well-designed test chart to have a blur image of the chart. This blur image is then corrected by using the perspective transformation. We use both of the image of the test chart and the corrected blur image to calculate a minimum mean square error (MMSE) filter, so that the blur image processed by the filter can be very alike to the test chart image. The filter is applied to other images captured by the imaging system in order to verify its effectiveness in reducing the blur and for showing the capability of extending the DoF of the integrated system.

Citation Download Citation

Po-Chang Chen, Chih-Hao Liu, Chir-Weei Chang, Chuan-Chung Chang, and Ludovic Angot "Digital decoding design for phase coded imaging system", Proc. SPIE 7443, Applications of Digital Image Processing XXXII, 74431A (2 September 2009); https://doi.org/10.1117/12.825459

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