How do I code to preform binary thresholding on image C? With the threshold values being .25,.63, and .89? And then display the images obtained and label the thresholds used in the plots.

a=imread('C:\Users\Nathan Donatell\Pictures\SanDiego.jpg');
g = rgb2gray(a);
b = im2double(g);
c= mat2gray(a);
D1=c .^(1/4);
D2=c .^(1/2);
D3=c .^(2/2);
D4=c .^(3/2);
subplot(2,4,1); imshow(D1); title('1/4');
subplot(2,4,5); imhist(D1, 256*1/4);
subplot(2,4,2); imshow(D2); title('1/2');
subplot(2,4,6); imhist(D2, 256*1/2);
subplot(2,4,3); imshow(D3); title('2/2');
subplot(2,4,7); imhist(D3, 256*2/2);
subplot(2,4,4); imshow(D4); title('3/2');
subplot(2,4,8); imhist(D4, 256*3/2);

[Walter Roberson]

What did you find when you searched the MATLAB documentation for information about thresholding?

I have already given you code to show you how to process images and display them and label them: where is your contribution in this?

Answer 1

[Image Analyst]

Try this:

bw1a = D1 < 0.25;
bw1b = D1 < 0.63;
bw1c = D1 < 0.89;
bw2a = D2 < 0.25;
bw2b = D2 < 0.63;
bw2c = D2 < 0.89;

Same for D3 and D4. That thresholds your images to create binary images. Then use subplot() and imshow() to plot the 12 images.