The glass defect auto detection has become one of the important technologies to improve glass quality.The defects can be detected

the information of defects can be transmited to the other processing

and then be improved.In order to obtain high-quality glass and the accurate information of defects

a new detection method based on the moiré fringes and three valued thresholding is proposed.The method can not only detect small defects

but also effectively detect glass wave.