Dimensional Measurement of Large Size Ceramic Tiles Using 2 Low Resolution Cameras

Dimensional measurement of ceramic tiles is critical for quality inspection in ceramic tile manufacturing enterprises. We describe a method of dimensional measurement of large size ceramic tiles using 2 low resolution cameras. In order to increase the measuring accuracy, two cameras placed just above the tile corners capture the detailed image of adjacent tile corners to calculate its sub dimensions. 3D approach is used to get the sub dimensions. The cameras capture the remaining corners of the tile after tile is moved by some distance to get the remaining sub dimensions. Then the sub dimensions with the dimensions of the background board on which the tile lies are used to calculate the dimension of sidelines and diagonals of the tile. The experimental results show that the proposed method is low cost, efficient and reliable. The measuring accuracy can reach 0.05mm. It can be easily introduced in in-line large ceramic tile inspection process.