The red, green, and blue dotted lines in Figure 2 illustrate how the reflected laser light will strike different sensor locations, depending on the distance between the laser source and the inspection target (or “surface”). The laser beam and the camera are both aimed at the inspection target (as shown in Figure 1), however by adopting a known angular offset (α) between the laser source and the camera sensor, it is possible to measure depth differences using trigonometry.įigure 1: Laser Triangulation Set-upUsing the fixed angular offset of the camera and laser positions, it is possible to derive the linear distance between the inspection surface and the camera’s sensor. Laser Triangulation is a machine vision technique used to capture 3-dimensional measurements by pairing a laser illumination source with a camera. One of the most popular techniques is Laser Triangulation. Several methods have been devised to extract depth information from camera images. While 3D vision is second-nature to humans, using cameras to generate an image with depth information is more challenging. We intuitively learn to extrapolate a 3-dimensional world using the two different 2-D images passed from our eyes to our brains. “stereoscopic vision”), we are able to perceive depth, in addition to width and height. Our perception of the world is 3-dimensional.
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