We demonstrate single-shot quantitative phase imaging (QPI) in a platform of color-coded LED microscopy (cLEDscope). The light source in a conventional microscope is replaced by a circular LED pattern that is trisected into subregions with equal area, assigned to red, green, and blue colors. Image acquisition with a color image sensor and subsequent computation based on weak object transfer functions allow for the QPI of a transparent specimen. We also provide a correction method for color-leakage, which may be encountered in implementing our method with consumer-grade LEDs and image sensors. Most commercially available LEDs and image sensors do not provide spectrally isolated emissions and pixel responses, generating significant error in phase estimation in our method. We describe the correction scheme for this color-leakage issue, and demonstrate improved phase measurement accuracy. The computational model and single-exposure QPI capability of our method are presented by showing images of calibrated phase samples and cellular specimens.
Bibliographical noteFunding Information:
National Research Foundation of Korea (NRF) (NRF-2015R1A5A1037668 and NRF-2015R1A1A1A05001548); Korea Ministry of Environment (KME) as Geo-Advanced Innovative Action Project (2015000540008) The authors would like to thank Seunghee Oh, Prof. Hyungsuk Lee, Kisuk Yang, Prof. Seung Woo Cho and Prof. Sang-Guk Lee for providing the cell samples.
© 2017 Optical Society of America.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics