Noncontinuous Scanning Method for Cooperative Targets Based on Correlated Double Sampling

The laser scanning projection systems scan to determine the position of the center of a cooperative target and then calculate the coordinate transformation between the projected surface and the projection instrument. This enables the laser projection system to accurately project the positions and contours of components. To solve the problem of ambient light interference during the calibration of a laser scanning projection system, this study proposes a detection module that uses correlated double sampling (CDS) technology. Experimental verification shows that this detection module can accurately identify whether the laser spot is located in the highly reflective region of the cooperative target, even when the signal interference ratio is −29.5 dB. In accordance with the features of the CDS technique, a noncontinuous scanning method was developed to quickly determine the center position of the cooperative target. The proposed methods were used to detect and scan cooperative targets at a distance of 5000 mm using a self-constructed laser scanning projection system. The results show that the noncontinuous scanning method reduces the number of sampling points by 97.5% compared with the raster scanning method, with a positioning deviation of 0.052 mm.