A mesh-candidate-based 3D reconstruction system for online depth recovery

A 3D measurement method based on mesh candidate and structured light is proposed for online measurement of cement clinker in the grate cooler. The laser beam was projected on the surface of the clinker and the stereo cameras acquired the images from different angles. By establishing the depth candidates in the world coordinate system, the depth was recovered according to intersection of the candidates and the laser stripe in the images. Our method has advantages such as simple structure, low computational cost, high accuracy, etc. The experiment proved the validity and it can meet the demand of the online 3D reconstruction of the cement clinker. With recovered depth of the clinker, the cooling air can be distributed reasonably, which plays an active role in energy-saving and ejection-decreasing.