Open AccessSingle-exposure quantitative phase imaging in color-coded LED microscopy
Author(s) -
Wonchan Lee,
Daeseong Jung,
S. Ryu,
Chulmin Joo
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.008398
Subject(s) - optics , microscopy , image sensor , microscope , light emitting diode , phase (matter) , artificial intelligence , pixel , computer vision , leakage (economics) , materials science , image processing , computer science , image (mathematics) , physics , quantum mechanics , economics , macroeconomics
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.