Camera calibration from fiberscopic views with accuracy evaluation

Abstract

In many medical applications glass-fiber endoscopes are used to acquire images from complex hollows for diagnostic and interventional purposes. For a complete exploration and understanding of an antrum, a 3-D model of the scene might be desirable or yet necessary. In order to perform a 3-D reconstruction, in most cases a calibration of the imaging system is required. In this paper we apply an adaptive raster reduction algorithm and an interpolation technique in order to eliminate the typical comb structure of fiberscopes enabling the appliance of common camera calibration techniques. Moreover we present a model of the fiberscopic transmission line in order to synthetize fiberscopic images from rigid endoscope images enabling an evaluation of the calibration results with respect to the comb structure removal approaches.