Averaged subtracted polarization imaging for endoscopic diagnostics of surface microstructures on translucent mucosae

An endoscopic image processing technique for enhancing the appearance of microstructures on translucent mucosae is described. This technique employs two pairs of co- and cross-polarization images under two different linearly polarized lights, from which the averaged subtracted polarization image (AV...

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Bibliographic Details
Published in:Journal of biomedical optics 2016-07, Vol.21 (7), p.071105-071105
Main Author: Kanamori, Katsuhiro
Format: Article
Language:English
Subjects:
Animals
Cameras
Color
Endoscopes
Endoscopy - methods
Gastric Mucosa - anatomy & histology
Gastric Mucosa - chemistry
Image processing
Image Processing, Computer-Assisted - methods
Microstructure
Phantoms, Imaging
Polarization
Swine
Texture
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Summary:An endoscopic image processing technique for enhancing the appearance of microstructures on translucent mucosae is described. This technique employs two pairs of co- and cross-polarization images under two different linearly polarized lights, from which the averaged subtracted polarization image (AVSPI) is calculated. Experiments were then conducted using an acrylic phantom and excised porcine stomach tissue using a manual experimental setup with ring-type lighting, two rotating polarizers, and a color camera; better results were achieved with the proposed method than with conventional color intensity image processing. An objective evaluation method that uses texture analysis was developed and used to evaluate the enhanced microstructure images. This paper introduces two types of online, rigid-type, polarimetric endoscopic implementations using a polarized ring-shaped LED and a polarimetric camera. The first type uses a beam-splitter-type color polarimetric camera, and the second uses a single-chip monochrome polarimetric camera. Microstructures on the mucosa surface were enhanced robustly with these online endoscopes regardless of the difference in the extinction ratio of each device. These results show that polarimetric endoscopy using AVSPI is both effective and practical for hardware implementation.
ISSN:1083-3668
1560-2281
DOI:10.1117/1.JBO.21.7.071105