Use of a Rotating Square Spatial-Frequency Filter to Map the Optical Path Length Variation in Microscopic Biological Samples
Gradient images can be obtained using a rotating square mask to filter the angular spectra of the wavefront generated by a complex transmittance object. This method can be applied to measure the three-dimensional structure of microscopic biological samples through the relationship of the phase with...
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Format: | Article |
Language: | English |
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MDPI AG
2022-02-01
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Series: | Sensors |
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Online Access: | https://www.mdpi.com/1424-8220/22/5/1842 |