Detect Blobs

Summary

"Blobs" are connected regions that stand out from their surroundings, usually in terms of pixel intensity. Such regions, once found, are marked in the output image with sequential numeric labels. Pixels belonging to the first detected blob have a value of one. Zero means background.

The Detection Blobs Tool has two modes of operation. The mode is selected by setting the Threshold Type parameter to either static or dynamic thresholding mode.
In the static mode you can set an absolute threshold which the intensity of each pixel in the object must exceed. If the Invert flag is false, the qualified pixels are brighter than the threshold. Setting the flag to true reverses the logic. In the example below, the threshold is set such that pixels with an intensity of 200 or higher are qualified. Notice that in the labels in the lower image have different colors because the image is displayed with a "light colors" color map.