Recognizing and Tracking Human Action
ECCV '02 Proceedings of the 7th European Conference on Computer Vision-Part I
Computing camera heading: a study
Computing camera heading: a study
Scale & Affine Invariant Interest Point Detectors
International Journal of Computer Vision
Distinctive Image Features from Scale-Invariant Keypoints
International Journal of Computer Vision
Efficient Belief Propagation for Early Vision
International Journal of Computer Vision
SIFT Flow: Dense Correspondence across Different Scenes
ECCV '08 Proceedings of the 10th European Conference on Computer Vision: Part III
Hybrid bronchoscope tracking using a magnetic tracking sensor and image registration
MICCAI'05 Proceedings of the 8th international conference on Medical image computing and computer-assisted intervention - Volume Part II
MICCAI'06 Proceedings of the 9th international conference on Medical Image Computing and Computer-Assisted Intervention - Volume Part I
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Co-located optical and virtual colonoscopy images provide important clinical information during routine colonoscopy procedures. Tracking algorithms that rely on image features to align virtual and optical images can fail when they encounter blurry image sequences. This is a common occurrence in colonoscopy images, when the endoscope touches a wall or is immersed in fluid. We propose a region-flow based matching algorithm to determine the large changes between images that bridge such interruptions in the visual field. The region flow field is used as the means to limit the search space for computing corresponding feature points; a sequence of refining steps is performed to identify the most reliable and accurate feature point pairs. The feature point pairs are then used in a deformation based scheme to compute the final camera parameters. We have successfully tested this algorithm on four clinical colonoscopy image sequences containing anywhere from 9-57 consecutive blurry images. Two additional tabletop experiments were performed to quantitatively validate the algorithm: the endoscope was moved along a slightly curved path by 24 mm and along a straight path by 40 mm. Our method reported errors within 1-5% in these experiments.