Dynamic illumination patterns for contrast enhancement using commercial media projector

Authors

Donna April Teodoro ⋅ PH National Institute of Physics, University of the Philippines Diliman
Edward Carlo Samson ⋅ PH National Institute of Physics, University of the Philippines Diliman
Leo Mendel Rosario ⋅ PH National Institute of Physics, University of the Philippines Diliman
Carlo Mar Blanca ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

In this study, we investigate the feasibility of the LCD projector as a low-cost dynamic filter generator and probe the advantages of using it as a microscope illumination source. The projector technology was applied to contrast enhancement of images of transparent samples by creating slideshow patterns for darkfield, Rheinberg, and oblique illumination. The projector-microscope system was also utilized to probe the birefringence of a sample by taking advantage of the polarized illumination the projector emits. Active delineation between high-frequency and low-frequency birefringent structures was performed by simultaneous optical-staining and polarization. Discrimination of structures of high spatial frequency (angular scattering microscopy) was also done by altering the effective numerical aperture and killing the zeroth-order illumination through annular filters of constant dark aperture size.

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Issue

2007: Proceedings of the 25th Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2007-PB-26

Section

Poster Session PB

Published

2007-10-24

How to Cite

[1]

DA Teodoro, EC Samson, LM Rosario, and CM Blanca, Dynamic illumination patterns for contrast enhancement using commercial media projector, Proceedings of the Samahang Pisika ng Pilipinas 25, SPP-2007-PB-26 (2007). URL: https://proceedings.spp-online.org/article/view/SPP-2007-PB-26.