INSPECTION SYSTEM EMPLOYING DIFFERENTIAL IMAGING

摘要

A system for inspecting a device to determine if it meets predetermined specification is disclosed. The system utilizes a TV image of a member of a class of devices to be inspected as a model to which a TV image of the device being inspected is compared to detect the differences therebetween. The differences between these two TV images is displayed on a color TV monitor in a first color. The TV image of the model being inspected is also displayed on the same monitor in a second color. This generates a composite television display in which the differences between the TV image of the specimen being inspected and the model thereof are displayed in one color while the remainder of the images is displayed in a second color. The differences in color permits the deviations from normal to be easily detected visually.