Skip to main content

Research Repository

Advanced Search

Optical Imaging Technology In Colonoscopy - Is There A Role For Photometric Stereo

Smith, Melvyn; Shandro, Benjamin M; Emrith, Khemraj; Slabaugh, Gregory; Poullis, Andrew


Profile Image

Melvyn Smith
Research Centre Director Vision Lab/Prof

Benjamin M Shandro

Dr Khemraj Emrith
Associate Head of Departmemt Business Engagement and Partnerships

Gregory Slabaugh

Andrew Poullis


Colonoscopy screening for the detection and removal of colonic adenomas is central to efforts to reduce the morbidity and mortality of colorectal cancer. However, up to a third of adenomas may be missed at colonoscopy, and the majority of post-colonoscopy colorectal cancers are thought to arise from these. Adenomas have three-dimensional surface topographic features that differentiate them from adjacent normal mucosa. However, these topographic features are not enhanced by white light colonoscopy, and the endoscopist must infer these from two-dimensional cues. This may contribute to the number of missed lesions. A variety of optical imaging technologies have been developed commercially to enhance surface topography. However, existing techniques enhance surface topography indirectly, and in two dimensions, and the evidence does not wholly support their use in routine clinical practice. In this narrative review, co-authored by gastroenterologists and engineers, we summarise the evidence for the impact of established optical imaging technologies on adenoma detection rate, and review the development of photometric stereo (PS) for colonoscopy. PS is a machine vision technique able to capture a dense array of surface normals to render three-dimensional reconstructions of surface topography. This imaging technique has several potential clinical applications in colonoscopy, including adenoma detection, polyp classification, and facilitating polypectomy, an inherently three-dimensional task. However, the development of PS for colonoscopy is at an early stage. We consider the progress that has been made with PS to date and identify the obstacles that need to be overcome prior to clinical application.


Smith, M., Shandro, B. M., Emrith, K., Slabaugh, G., & Poullis, A. (in press). Optical Imaging Technology In Colonoscopy - Is There A Role For Photometric Stereo. World Journal of Gastrointestinal Endoscopy, 12(5), 138-148.

Journal Article Type Article
Acceptance Date May 12, 2020
Online Publication Date May 16, 2020
Deposit Date May 14, 2020
Publicly Available Date May 14, 2020
Journal World Journal of Gastrointestinal Endoscopy
Publisher Baishideng Publishing Group
Peer Reviewed Peer Reviewed
Volume 12
Issue 5
Pages 138-148
Keywords Photometric stereo; Colonoscopy; Colonic polyps; Adenomas; Image enhancement; Machine vision
Public URL
Publisher URL


Optical imaging technology in colonoscopy: Is there a role for photometric stereo? (17.9 Mb)


Publisher Licence URL

Copyright Statement
All articles published by BPG are selected by an in-house editor and fully peer-reviewed by external reviewers. BPG applies the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See:

You might also like

Downloadable Citations