FindThreshold

FindThreshold[image] finds a global threshold value that partitions the intensity values in image into two intervals.

Examples

Find an optimal threshold for an image:

img = ExampleData[{"TestImage", "Lena"}];
FindThreshold[img]

Use the threshold for binarization:

t = FindThreshold[img];
Binarize[img, t]

Please visit the official Wolfram Language Reference for more details.