A resolution adjustable 3D scanner based on using stereo cameras - Embedded.com

A resolution adjustable 3D scanner based on using stereo cameras

3D scanners are now entering consumer-level products for various applications, where previously they were mainly used in reverse engineering, industrial inspection, heritage protection, et al. In these fields, non-contact measurement methods are often used for efficiently acquiring range data.

In non-contact measurements, there are two main categories called time-of- flight and triangulation methods. The triangulation method usually casts light stripes on the surface of objects, and then a receiver acquires images for disparity analysis.

While it can be carried out using cost effective components, it is still very sensitive to the material used in the objects. This paper addresses a stereo-based 3D scanner system, which is able to acquire various resolution range data. The system consists of stereo cameras and one slit laser.

In each stereo image pair, we cast one laser stripe on the surface of object, and analyze their disparities for determining their depth values. Utilizing a super-sampling filter, the sub-pixel features are generated for enhancing the native resolution of CCD component.

In this system, we use one slit laser for sweeping the surface of objects and generating correspondences under the epipolar constrain. Since the correspondences are generated by the positions of the cast stripes, their resolution is controllable.

We focus on developing a high flexibility 3D scanner whose resolution is adjustable. The operation has high flexibility and it allows users to readily sweep a slit laser under different speeds and various tilt angles.

The stereo camera aims at the object and the user sweeps a slit laser for casting laser lines on this object. All of the captured images from this stereo camera are synchronized. And then, they are transmitted to one computer for 3D reconstruction.

To read this external content in full, download the complete paper from the author archive on line.

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