How to I get a threshold value from looking at histogram

12 次查看(过去 30 天)
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 个评论
Chok Chuan
Chok Chuan 2015-3-29
编辑:Chok Chuan 2015-3-29
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.

请先登录,再进行评论。

回答(1 个)

Youssef  Khmou
Youssef Khmou 2015-3-29
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