22.2 APPLICATIONS

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An example of a common vision system application is given below. The basic operation involves a belt that carries pop (soda) bottles along. As these bottles pass an optical sensor, it triggers a vision system to do a comparison. The system compares the captured image to stored images of acceptable bottles (with no foreign objects or cracks). If the bottle differs from the acceptable images beyond an acceptable margin, then a piston is fired to eject the bottle. (Note: without a separate sensor, timing for the piston firing is required). Here a PLC is used as a common industrial solution controller. - All of this equipment is available off-the-shelf ($10K-$20K). In this case the object lighting, backgrounds and contrast would be very important.