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Image processing
4.6 Main ROI and sub-ROI
Example of recognition of a bad object
4.6.2
Example of the influence of sub-ROIs on the quality value
Based on the example below, we will illustrate the effects on the quality value of a specimen
of using sub-ROIs.
Note
If features are allowed in the area enclosed by the ROI or sub-ROIs that you do not want to
be evaluated, select "Find" as the job in the "Options - Training tab" of the adjustment
support. Otherwise, select the value "Identify".
The example model appears as follows:
Note
If only one main ROI is used, the cumulative quality corresponds to the quality of the main
ROI.
If sub-ROI and main ROI are used, the cumulative quality is calculated from the average of
the sub-ROI qualities.
4-10
In this example, the "S" and the "N" are missing. If
only one ROI had been trained, the quality would
have been 87.2% (=quality of the main ROI).
Sub-ROI1: 60.6%
Sub-ROI2: 98.7%
Sub-ROI3: 42.0%
70% is selected as the quality limit for all ROIs and
an object is then evaluated as N_OK if a sub-ROI
falls below the quality limit.
Operating Instructions, Edition 02/2006, A5E00757507-01
Vision Sensor SIMATIC VS120
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