JPS5611560A - Designation system of specific area - Google Patents

Abstract

PURPOSE:To enable the failure inspection with high accuracy, by calculating the position of the two dimensional pattern obtained by the image sensor on the image screen, and automatically moving the pattern so that the position is in agreement with the position of the area designation pattern stored in advance. CONSTITUTION:The image signal picking up the tested object 301 with the image sensor 302 is fed to the binary curcuit 307 and the failure check circuit 322, it is compared with the threshold level Vs at the circuit 307, and when the signal (b) is greater, it is separated from the background to output the background binary signal C. The leading and trailing points of this signal C is picked up in every horizontal scanning line of the image signal, and the coordinate value at external circumference is stored in the external circumference point memory circuit 310. Further, the CPU circuit 311 is controlled with the sequence control circuit 304, the coordinate value stored in the circuit 310 is read at the horizontal and vertical initial value registers 312, 313, the position on the screen is detected at the designated area leading and trailing point detection circuits 318, 319, and the pattern is moved to be matched with the position of the designated area leading and trailing point memories 316, 317 stored in advance, allowing to perform failure check with high accuracy.