Structured lighting
This technique projects accurate patterns onto a target and then measures the displacement or distortion in order to calculate the shape, size or position of the object. In the easiest form, a line is projected onto a target and observed under a known angle from a camera. The distortions in the line can then be translated into height variations. This technique is often referred to as laser triangulation. Structured illumination is often used to obtain height information and especially for 3D inspection tasks.
This technique projects accurate patterns onto a target and then measures the displacement or distortion in order to calculate the shape, size or position of the object. In the easiest form, a line is projected onto a target and observed under a known angle from a camera.
Structured lighting is also widely used in alignment applications where markers are required to adjust tools or components and is also employed in medical applications such as the placement of patients for X-ray or radiation.