Magnification at the Machine vision camera:
All machine vision cameras have a fixed sensor size. This means that no matter how large the image is at the sensor plane, the machine vision camera will only “ look at” the portion of the subject equal to the sensor size. What the camera “sees” is called the field of view. The lens, or lens system, of the machine vision camera controls the magnification at the machine vision camera sensor. Thelower this magnification, the larger the field of view.
Magnification at the monitor:
When the machine vision camera image is displayed on a monitor for viewing, there is further magnification. The diagonal of the machine vision camera sensor is expanded to the diagonal pf the monitor.
Consider this example: A ½” machine vision camera is being used with a 13” monitor. The 8mm diagonal of the machine vision camera will expand to 13” (330.2mm) for a magnification of 41.3X.
In practice, the machine vision camera is actually overextended in order to overfill the monitor and prevent dark edges. There is no recognized industry standard, however, a 5-10% increase in magnification resulting in a 5-10% loss in field of view can be assumed.
Note: Courtesy: Navitar INC,. USA
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