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Derivation
A differential processing is performed to calculate the change in density between neighboring pixels. A
differential waveform with the largest density set as 100% of the region is created, and the maximum
value (peak point) of the differential waveform that exceeds the threshold (edge level) is detected as an
edge.
With an image with low contrast, the differential method is suitable as it normalizes the differences
between the neighboring pixels for processing.
Edge Level
Indicates the edge color change level (degree of color difference). This level is adjusted if edges cannot
be accurately detected.
Note
The value 0 to 100 for the edge level indicates the edge intensity.It is not related to color differences in the
●
original image.
For case of measurement using relative position (%) with regards to width of color difference
The edges are detected in the following manner.
1.
Calculate the overall distribution of color difference in the measurement region.
2.
Min. color difference value: 0%; Max. color difference value: 100%
3.
Locations in which there is an edge level color difference are detected as edges.
Edge Position
Edge Pitch
FZ4 User's Manual
Measurement Mechanism
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