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World J Gastrointest Endosc. 2013 Sep 16;5(9):465-7. doi: 10.4253/wjge.v5.i9.465.

Use of enhancement algorithm to suppress reflections in 3-D reconstructed capsule endoscopy images.

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Anastasios Koulaouzidis, Endoscopy Unit, Centre for Liver and Digestive Disorders, the Royal Infirmary of Edinburgh, Scotland, EH16 4SA, United Kingdom.


In capsule endoscopy (CE), there is research to develop hardware that enables ''real'' three-dimensional (3-D) video. However, it should not be forgotten that ''true'' 3-D requires dual video images. Inclusion of two cameras within the shell of a capsule endoscope though might be unwieldy at present. Therefore, in an attempt to approximate a 3-D reconstruction of the digestive tract surface, a software that recovers information-using gradual variation of shading-from monocular two-dimensional CE images has been proposed. Light reflections on the surface of the digestive tract are still a significant problem. Therefore, a phantom model and simulator has been constructed in an attempt to check the validity of a highlight suppression algorithm. Our results confirm that 3-D representation software performs better with simultaneous application of a highlight reduction algorithm. Furthermore, 3-D representation follows a good approximation of the real distance to the lumen surface.


Accuracy; Capsule endoscopy; Experiment; Phantom; PillCam; Software; Three-dimensional reconstruction

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