3D detection method and device based on three-camera cooperative laser

The invention discloses a 3D detection method and device based on three-camera cooperation laser. The method comprises steps that grid laser is adopted as an active light source to irradiate the surface of an object; a laser line image is collected through a trinocular camera; the three-dimensional information of the laser ray image is obtained through image processing and calculation so that point cloud of the contour of the target object is obtained; if denser point clouds need to be obtained, the translation laser can be controlled through the stepping motor, so the target object is scanned, three-dimensional point cloud data of a complete outline of the surface of the target object is obtained, point cloud data with higher precision can be obtained, and three-dimensional information such as the position and the posture of the target object can be further obtained. The method solves problems of difficult feature point matching, low point cloud precision, high requirements for illumination conditions and th