Authors:
O. Zenteno
1
;
A. Krebs
2
;
S. Treuillet
1
;
Y. Lucas
1
;
Y. Benezeth
2
and
F. Marzani
2
Affiliations:
1
Universite d’Orleans, France
;
2
Univ. Bourgogne Franche-Comté, France
Keyword(s):
Gastroendoscopy, Multispectral Imaging, Optical Biopsy.
Related
Ontology
Subjects/Areas/Topics:
Applications and Services
;
Computer Vision, Visualization and Computer Graphics
;
Device Calibration, Characterization and Modeling
;
Image and Video Analysis
;
Image Formation and Preprocessing
;
Image Registration
;
Medical Image Applications
Abstract:
Multispectral measurement and analysis have proven to be useful to detect and monitor gastric pathologies at
early stages. We developed a multispectral-augmented endoscopic prototype which allows exploration in the
visible and near infrared range (400-1000 nm), increasing the common number of bands under analysis. The
prototype comprises a fiberscope connected to two multispectral snapshot cameras which is inserted through
the instrument channel of a commercial endoscope. However, due to aseptic practices, the system must be
sterilized between exams, forcing physicians to remove and reintroduce it on each examination and leading
to different relative positions between modalities. In the present work, we introduce an axial displacement
correction function for dual-channel registration (i.e., RGB and multispectral) based on the insertion depth of
the fiberscope. The performance was assessed using a chessboard pattern and its corner coordinates as ground
truth. The mean RMSE error of th
e control points after registration using our method was 2.3 ± 0.7 pixels,
whereas the RMSE error using a frame by frame homographic registration was 1.2 ± 0.4 pixels. In addition,
the technique was tested on mouth exploration samples to simulate in-vivo acquisition. The results reveal
that our method provides similar results when compared to a homographic transformation which would be
impossible to perform in-vivo.
(More)