Peak & Valley Probe
The Peak & Valley Probe provide a way to locate peaks (maximum points) and valleys (minimum points) along
a specifed line in an image. This is similar to the Edge Probe but instead
of detecting large changes in intensity this module will detect the change in direction of intensity. This
is useful in detecting patterns, frequencies or recocurring objects.
To better visualize these peaks and valleys you can use the Line Profile module that
displays the pixel intensities along a line. If you see a nice peak and valley curve then it is a good
candidate for the Peak & Valley Probe module.
Interface
Instructions
1. Coordinates - Specify the line location to probe for peaks or valleys. You can either drag the
squares in the Current Image display or specify the numbers in the provided text boxes. Keep in
mind that the [expression] notation also applies in the text box.
2. Options Identity - Specify the maximum number of peaks or probes you want to detect.
3. Options Smooth - If you are detecting too many peaks or valleys try smoothing the pixels. This will
reduce intensity noise and produce better results.
4. Options Isolation - To avoid detecteding too many points close to each other increase the isolation
count. This will force only the best detection per X pixels to be recorded.
5. Options Abs Threshold - Select how high a peak needs to be before it could be qualified as a peak OR
how low a valley needs to be before it could be qualified as a valley.
6. Options Relative Threshold - Select how low a valley must exists between two peaks or how high a peak much exist
between two valleys. This helps to reduce local dips or bumps that might trigger an incorrect peak or valley detection.
7. Select if you are detecting a peak or valley.
8. Zoom - Select the zoom for the Current Image in case it is too large or small for the provided viewing
area.
9. Show PVs - to visually see which points are detected (in the main RoboRealm interface)
select the appropriate Color and Thickness of the point that will indicate where
in the image the peak or valley has been detected.
10. Include Intensity - If you want to know the intensity value in addition to the peak or valley coordinates
select the Include Intensity checkbox. This will add the intensity value after the X and Y coordinates in the
recorded array PROBED_PEAK_VALLEY.
Example
Red spots are used to detect the valleys inbetween the tea bags. The total count-1 is the number of tea bags.
| Peak & Valley Probe |
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 Click here to download this example and run in RoboRealm.
Variables
PROBED_PEAK_VALLEY_COUNT - the number of peaks or valleys found
PROBED_PEAK_VALLEY - an x,y array of the location of the detected peaks
or valleys.
OR
PROBED_PEAK_VALLEY - an x,y,intensity array of the location of the detected peaks
or valleys along with the intensity value depending on the setting of
Include Intensity checkbox.
See Also
Line Profile
Edge Probe
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