How to get entropy values of different images to a graph?
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Ishara Nipuni
le 25 Nov 2018
Commenté : KALYAN ACHARJYA
le 25 Nov 2018
Hi,
I have calculated the entropy values of different images using the code I have shown below. Now I need to get the entropy values o several images to a graph. Can you please help me on that?
%read te image
I = imread('152.bmp');
subplot(2,2,1),imshow(I,map1)
I2 = imread('006.bmp');
subplot(2,2,3),imshow(I2,map2)
x = entropy(I);
x2 = entropy(I2);
[Height,Width] = size(I);
[m,Binsx] = imhist(I);
%normalize the counts
m = m/(Height*Width);
%get the sum of the histogram values
sprintf('the sum of the histogram value is = %g',sum(m));
subplot(2,2,2),plot(Binsx,m,'k')
xlabel('pixel value'),ylabel('relative count')
H = sum(-m.*log2(m));
sprintf('the entropy of the image is = %g',H)
%calculate height & width of the image
[Height,Width] = size(I2);
%get the histogram of the image in 256 bins
[n,Binsx] = imhist(I2);
%normalize the counts
n = n/(Height*Width);
%get the sum of the histogram values
sprintf('the sum of the histogram value is = %g',sum(n));
%
subplot(2,2,4),plot(Binsx,n,'k')
xlabel('pixel value'),ylabel('relative count')
H2 = sum(-n.*log2(n));
sprintf('the entropy of the image is = %g',H2)
%get the graph of the entropy values
figure(),plot(H,H2);
xlabel('image number'),ylabel('entropy value')
1 commentaire
Image Analyst
le 25 Nov 2018
Do you want both entropy values on one graph? Why not use bar() instead of plot()?
Réponse acceptée
KALYAN ACHARJYA
le 25 Nov 2018
I=imread('test.png');
I2=imread('test.jpg');
x=entropy(I);
x2=entropy(I2);
bar([x x2]);
set(gca,'xticklabel');
title('Entropy of Two Images');
Another Way:
I=imread('test.png');
I2=imread('test.jpg');
x=entropy(I);
x2=entropy(I2);
bar(1,x);
hold on;
bar(2, x2,'r');
bar_name={'Image 1' 'Image 2'};
legend(bar_name,'location','northwest');
title('Entropy of Two Images');
2 commentaires
KALYAN ACHARJYA
le 25 Nov 2018
Welcome @Ishara
I'm glad, it helped.
Good Wishes
Regards,
Kalyan Acharjya
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