The lens selection plays an important role in determining the performance of image processing–based inspection.

A digital camera has almost the same structure as that of a conventional (analog) camera, but the difference is that a digital camera comes equipped with an image senso（CCD or CMOS）.

There are many different types of light sources available including the following:
• Incandescent lamps
• Fluorescent lamps
• LED lights

How to determine the best illumination for a specific machine vision task? There are in fact several aspects that must be taken into account to help you choose the right illumination for your vision system.