Accuracy of three-dimensional measurement using a single image

Abstract

The accuracy of 3-D measurement using a single image of a four-point coplanar target of known size is studied. The factors that influence accuracy are analyzed and experimental techniques are used to establish their individual effect on accuracy. Experiments show that the four-point coplanar target has two solutions for real images and that mixing these causes large errors. It is concluded that when the target is approximately parallel to the image plane, the accuracy is significantly better compared to other target orientations, and that image distance is a critical factor affecting accuracy in the depth, while the effect of the other factors on accuracy is relatively insignificant. A new calibration technique is introduced that determines an average image distance over the image plane within the depth of focus and improves accuracy at close range. © 1997 Society of Photo-Optical Instrumentation Engineers.Subject terms: three-dimensional measurement; image analysis; perspective four-point problem.

Space imaging optical guidance for ground vehicle

“…Therefore we developed the fast travel of the detector with the fast repetition cycle along the optical axis of the object lens to catch the focused image of the object. We move it fast back and forth with the same interval to be able to focus near objects, far objects and free space on the detector [8][9][10][11][12][13][14][15][16] .…”