Estimating Reflectance Parameter of Polyp using Medical Suture Information in Endoscope Image
Yuji Iwahori, Daiki Yamaguchi, Tsuyoshi Nakamura, Boonserm Kijsirikul, Manas Kamal Bhuyan, Kunio Kasugai · 2016
An endoscope is a medical instrument that acquires images inside the human body. In this paper, a new 3-D reconstruction approach is proposed to estimate the size and shape of the polyp under conditions of both point light source illumination and perspective projection. Previous approaches could not know the size of polyp without assuming reflectance parameters as known constant. Even if it was possible to estimate the absolute size of polyp, it was assumed that the parameter of camera movement ∆Z is treated as a known along the depth direction. Here two images are used with a medical suture which is known size object to solve this problem and the proposed approach shows the parameter of camera movement can be estimated with robust accuracy with correspondence between two images taken via slight movement of Z. Experiments with endoscope images are demonstrated to evaluate the validity of proposed approach.