Saddle points  
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Menu:   Processing > Morphology… > Geodesy->Node points  
Script:   saddles  
Use this command to find saddle points of thin bright structures in color and grayscale images. The function works by treating the image as a topographic surface and extracting the points of minimums in the intensity ridges. See Watershed
for more details.

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.