Deformable registration for generating dissection image of an intestine from annular image sequence

Authors:
Suchit Pongnumkul;Ryusuke Sagawa;Tomio Echigo;Yasushi Yagi
Affiliations:
The Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan;The Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan;The Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan;The Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan
Venue:
CVBIA'05 Proceedings of the First international conference on Computer Vision for Biomedical Image Applications
Year:
2005

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Abstract

Examination inside an intestine by an endoscope is difficult and time consuming, because the whole image of the intestine cannot be taken at one time due to the limited field of view. Thus, it is necessary to generate a dissection image, which can be obtained by extending the image of an intestine. We acquire an annular image sequence with an omnidirectional or wide-angle camera, and then generate the dissection image by mosaicing the image sequence. Though usual mosaicing techniques transform an image by perspective or affine transformations, these are not suitable for our situation because the target object is a generalized cylinder and the camera motion is unknown a priori. Therefore, we propose a novel approach for image registration that deforms images by a two-dimensional-polynomial function which parameters are estimated from optical flow. We evaluated our method by registering annular image sequences and we successfully generated dissection images, as presented in this paper.