Rockwell Automation 48MS MultiSight Vision Sensor - Manual (Page 36)

MultiSight™ User Manual
Start-up
36 10000000877(02)
For example, here is the same image with three different shutter speeds:
The setting of the threshold determines the maximum number of pixels detected as being dark which is required to pass the
evaluation. The position of each dark pixel within the ROI does not affect the evaluation.
Example:
These two images produce exactly the same result in the brightness evaluation because
in each case 9 of the 25 pixels are detected as dark.
Contrast
The Contrast Detector Type evaluates the difference between the brightness levels of the pixels in the ROI. An image that is all one
shade of one color has low contrast. An image that is half white and half black has very high contrast.
Example:
Summary of Brightness and Contrast Detector Types
For Contrast and Brightness Detector Types, the teach function is only used for Automatic Shutter Adjustment. It is recommended
that the Shutter Adjustment parameter is set to Manual, in which case the Teach command has no effect.
Region of Interest:
Shutter setting:
=
=
=
=
=
= 100%
= 0%
5% =
Detector Type
ROI Image
Brightness
bar graph
Contrast
bar graph
100% <10%
50% >90%
0% <10%