In order to improve the efficiency and accuracy of the setting value checking of relay protection device, an automatic checking method based on image processing was proposed. The photo of setting list is collected by mobile phone, and the original image is preprocessed by gray-scale enhancement, binarization and tilt correction to extract the clear table image. Morphological method is used to segment cells in table image, and the setting value information in each cell image is obtained by optical character recognition and correlation correction of recognition result. At last, through the establishment of keywords database and process customization of different types of devices, the setting value infor-mation is stored and automatically checked. The field application results show that this method has high feasibility and reliability, which can provide technical support for improving the work efficiency of related personnel and ensuring the accuracy of setting value.
