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TitleContinuous zoom calibration by tracking salient points in endoscopic video
Author(s)Lourenço, Miguel
Barreto, João P.
Fonseca, Fernando
Ferreira, Hélder
Duarte, Rui M.
Correia-Pinto, Jorge
KeywordsAnatomic Landmarks
Image Enhancement
Microscopy, Video
Pattern Recognition, Automated
Phantoms, Imaging
Reproducibility of Results
Sensitivity and Specificity
Video Recording
Issue date2014
JournalLecture Notes in Computer Science
CitationLourenço, M., Barreto, J. P., Fonseca, F., Ferreira, H., Duarte, R. M., & Correia-Pinto, J. (2014, September). Continuous zoom calibration by tracking salient points in endoscopic video. In International Conference on Medical Image Computing and Computer-Assisted Intervention (pp. 456-463). Springer, Cham.
Abstract(s)Many image-based systems for aiding the surgeon during minimally invasive surgery require the endoscopic camera to be calibrated at all times. This article proposes a method for accomplishing this goal whenever the camera has optical zoom and the focal length changes during the procedure. Our solution for online calibration builds on recent developments in tracking salient points using differential image alignment, is well suited for continuous operation, and makes no assumptions about the camera motion or scene rigidity. Experimental validation using both a phantom model and in vivo data shows that the method enables accurate estimation of focal length when the zoom varies, avoiding the need to explicitly recalibrate during surgery. To the best of our knowledge this the first work proposing a practical solution for online zoom calibration in the operation room.
TypeConference paper
Publisher version
AccessRestricted access (Author)
Appears in Collections:ICVS - Artigos em Revistas Internacionais com Referee

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