| 摘要 |
PURPOSE:To inspect print quality such as a cut, blur and contamination of a pattern printed on an object with little influence from a fluctuation of lighting and a fluctuation in an image signal level and without position correction needed. CONSTITUTION:An inspecting apparatus for printed pattern quality comprises a camera 1 for picking an image of an object whose quality is to be inspected, an image acquisition circuit 2 for acquiring visual signals from the camera 1, a binary-coding circuit 3 for binary-coding the acquired image, a binary image data storage circuit 4 for storing binary image data, a vertical edge detecting circuit 5 and a lateral edge detecting circuit 6 for detecting edges from the binary image data, a vertical edge number counting circuit 7 and a lateral edge number counting circuit 8 for obtaining a distribution of the number of edges from the detected edges, and an arithmetic control circuit 9 which detects a peak from the obtained distribution of the number of edges, compares it with a peak of a distribution of the number of edges of a good product and determines whether or not the object is good. |
