Stereo Vision System with Non-parallel Optic Axes for Small Object Contour Detection

Abstract

Additive Manufacturing (AM) also known as 3D printing has been gradually applied in various fields such as the automotive aviation materials medical and even food industries In medicine with the development of AM combined with regenerative medicine 3D printing of artificial organs now brings hope to transplant patients One of the advantages of AM is the ability to create customized objects In order to provide the shape scanning function to the field of medicine there are some conditions that must be met: harmless to humans low cost fast and easy to use Stereo Vision System which is an aspect of non-contact scanning is one method that has these characteristics Traditional stereo vision cameras are placed in parallel and obtain depth information based on disparities This research use Stereo Vision System with non-parallel optic axes to scan small objects at close proximity to construct a contour Through the vector mathematical model established by projection geometry and two camera coordinate systems the formula describes the relationship between projections on two camera sensors and the object distance In the contour reconstruction the un-matched points are complemented by interpolation first then Gaussian smoothing is used to deal with the noise problem Finally use surface fitting to build the object’s surface This research provides a scanning method for 3D modeling especially for special needs such as scanning eyes

Date of Award	2018 Sept 4
Original language	English
Supervisor	Ta-Chung Wang (Supervisor)