Measure Intensity Controls

NI Vision Builder

Check for Presence Measure Features Tab

Measure Intensity Controls

Main Tab

The following controls are available on the Main tab.

Control Name Description
Step Name Name to give the step.
Region of Interest The region of interest you want to use for the step.
Reposition Region of Interest When enabled, the step dynamically repositions the region of interest based on a coordinate system you built in a previous step.
Reference Coordinate System Coordinate system to which you want to link the region of interest.

Histogram Tab

The Histogram tab displays information about the number of pixels at each grayscale intensity contained in the region of interest. The x-axis of the graph represents the grayscale intensities, and the y-axis of the graph represents the number of pixels at the intensity level. Bright pixel intensities are represented with high numerical values, where 255 is the maximum value. Dark pixels are represented with low values, where 0 is the minimum value.

The Histogram tab also displays the average intensity, standard deviation, minimum intensity, and maximum intensity of the pixels contained in the region of interest.

Note Note  A higher standard deviation value indicates a better distribution of the grayscale intensities in the region of interest. A lower value characterizes a region of interest with homogeneous pixel intensities.

Limits Tab

The following controls are available on the Limits tab.

Control Name Description
Average Intensity When enabled, the average intensity of pixels in the region of interest must lie within the minimum and maximum values in order for the step to pass.
Standard Deviation When enabled, the standard deviation of pixels in the region of interest must lie within the minimum and maximum values in order for the step to pass.
Minimum Intensity When enabled, the lowest grayscale intensity in the region of interest must lie within the minimum and maximum values in order for the step to pass.
Maximum Intensity When enabled, the highest grayscale intensity in the region of interest must lie within the minimum and maximum values in order for the step to pass.