The speckle laser stereo camera and line laser stereo camera are used
complementary to different use scenarios, which can solve the problem of barcode occlusion when the measured object spacing is small. The speckle laser stereo camera reflects the height difference between the measured object and the conveyor belt in the lateral offset of the speckle in the image, and only needs to collect a very narrow area in the process of image acquisition, which is conducive to improving the image acquisition frame rate and shortening the image algorithm processing time, to achieve high frequency measurement.