Abstract
An electronic endoscopic sytem with slit beam projection has been developed to measure a profile of the surface of the object. This system is consisted of VIDEO System (CV 200, 01ympus), electronic endoscopy(GIF type Q200, 01ympus), and EVIP 230 for image processing. Slit beam from an angio fiberscope was projected onto an object surface. The distance from an endoscope to the surface of the object can be calculated from the intensity distribution of slit image coordinates since the relation between coordi-Hates of the image and the distance is related in advance by polynominal equation. Two types of test objects with convex and concave surfaces were measured from two directions; perpendicular(90°)and oblique (-70°to 110°), and the measuring precision was analyzed. The mean error for the concave surface by measurement from the perpendicular direction was less than 2%, however, mean errors for the measurement of the height and diameter in the convex surface were 3.1%and 20.4%respectively. On the other hand, in the oblique direction, the mean error was approximately the same as the perpendicular direction. We also measured a surface profile of human gastric ulcer.
