How to I get a threshold value from looking at histogram

27 visualizzazioni (ultimi 30 giorni)
I need to get a threshold value not by looking at the graph I was told there is a way to calculate the threshold value from the histogram, Can someone help me
  2 Commenti
Chok Chuan
Chok Chuan il 29 Mar 2015
Modificato: Chok Chuan il 29 Mar 2015
I = imread('Test1.tif'); J=rgb2gray(I); figure; imhist(J);
thresholdValue = 100; bw = J > thresholdValue;
I am currently putting a casual 100 inside after looking at the histogram. I need the threshold value to segment the picture into fore and background. Is the a way to calculate a precise threshold value.

Accedi per commentare.

Risposte (1)

Youssef  Khmou
Youssef Khmou il 29 Mar 2015
Otsu's method exists as built in function with name graythresh, here is an example taken from Mathworks help page :
I = imread('coins.png');
level = graythresh(I);
BW = im2bw(I,level);
there might be other techniques to choose an adequate threshold.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by