How to I get a threshold value from looking at histogram

조회 수: 4(최근 30일)
Chok Chuan
Chok Chuan 2015년 3월 29일
답변: Youssef Khmou 2015년 3월 29일
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
  댓글 수: 2
Chok Chuan
Chok Chuan 2015년 3월 29일
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.

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Youssef  Khmou
Youssef Khmou 2015년 3월 29일
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.

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