Closed contour specular reflection segmentation in laparoscopic images

Authors:
Jan Marek Marcinczak;Rolf-Rainer Grigat
Affiliations:
Hamburg University of Technology, Hamburg, Germany;Hamburg University of Technology, Hamburg, Germany
Venue:
Journal of Biomedical Imaging
Year:
2013

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Abstract

Segmentation of specular reflections is an essential step in endoscopic image analysis; it affects all further processing steps including segmentation, classification, and registration tasks. The dichromatic reflectance model, which is often used for specular reflection modeling, is made for dielectric materials and not for human tissue. Hence, most recent segmentation approaches rely on thresholding techniques. In this work, we first demonstrate the limited accuracy that can be achieved by thresholding techniques and propose a hybridmethod which is based on closed contours and thresholding. The method has been evaluated on 269 specular reflections in 49 images which were taken from 27 real laparoscopic interventions. Ourmethod improves the average sensitivity by 16% compared to the state-of-the-art thresholding methods.