iRVision emphasis area - http://www.fanucrobotics.com/products/vision-software/AtoZ.aspx
The iRVision emphasis area feature is used to differentiate parts based on small details of a larger part. An example of this feature is finding a wheel and finding the rotational orientation based on the valve stem hole. This feature can also be used to identify troublesome features of a part. An example of this feature is finding a tab on a larger part, iRVision can find the part and verify the tab is present and positioned properly. The video details a third example where a gear is used to show iRVision can identify the top side of the gear by using a very small tick mark