Local minima  
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Menu:   Processing > Morphology… > Geodesy->Local minima  
Script:   localMin  
Use this command to find local minima of intensity in an image. The function works by extracting only those target pixels whose values are less or equal to the values of all the pixels in their neighborhood. The size and shape of the neighborhood pattern is selected with the Probe option.

If you choose this command, the following options will become available:

Displays the input image frame number. If you want to process another image, type or select the corresponding value.  

Displays the number of the frame in which the output image will be created. Depending on the Preferences. ImageWarp will set it either to the first available value or to the Input frame number. Type or select another value if you want the output image to be created in a different frame.  
Select this check box to watch the Preview of the output image.  

Lets you chose the size and shape of the kernel used in the operation. Probe elements with check marks are active, empty elements are ignored. Choose among the following most usable kernels:  
1x3 vertical bar
3x1 horizontal bar
3x3 cross
3x3 diagonal cross
3x3 square
5x5 circle