The thickness of glaze is one of the important indicators in the quality evaluation of Longquan celadon. But till now, there is no automatic and non-destructive method to measure it. In order to satisfy this demand, an automated method has been proposed to measure the glaze thickness based on optical coherence tomography (OCT) technique. According to the morphological characteristics of celadon glaze in OCT image, the proposed method locates the upper and lower boundaries of the glaze layer, then the glaze thickness is automatically calculated after the axial resolution calibration of the OCT images for different categories of Longquan celadon. In the experiment, the glaze OCT images of 6 different categories of Longquan celadon were applied in the glaze thickness estimation. By comparing with the physical measuring result, this method is proved to be able to measure the glaze thickness rapidly and non-destructively and the performance is enough to meet the demand of the industrial application.

Keywords: Optical coherence tomography (OCT), Longquan celadon, Glaze, Thickness