Patent ID: 9665795
Date: 2017-05-30
CPC Classifications: G06K,G06T

Claim:
1. A method of determining defective equipment, the method comprising: generating a sample defect map which shows defect distribution in cells of a defective sample; generating equipment defect maps of a plurality of pieces of equipment through which products of the defective sample passed; calculating map similarities between the sample defect map and the equipment defect maps; and determining one or more defective pieces of equipment of the plurality of pieces of equipment, which are the cause of the defective sample, based on the map similarities, wherein the defective sample comprises the products, each of the products being divided into a plurality of cells, and one of the equipment defect maps for one of the plurality of pieces of equipment, shows a defect distribution in cells of the products that passed through the one of the plurality of pieces of equipment, wherein the calculating of the map similarity for each piece of equipment whose equipment defect map has been generated comprises: wherein the cell similarity of a specific cell position is a ratio of the number of defective cells in the specific cell position of the equipment defect map to the number of defective cells in the specific cell position of the sample defect map, and the map similarity is the average of cell similarity values of at least some of the cell positions.