Finding max intensity pixel in image doesnt work in code

7 次查看（过去 30 天）
john hancock
john hancock 2018-9-22
编辑： Stephen23 2018-9-23
Hello, I am a beginner so I can only work with basic code for now. The assignment was to use 2 pictures, get the difference between the two, then find the max intensity pixel, but as you can see from the percentage marks, I have tried many things and none have worked. If anyone has a suggestion please feel free to respond.
colormap('gray');
%displays plane 1 BMP
planes1pic = imread('planes1.bmp');
subplot( 4, 1, 1);
imagesc(planes1pic);
axis off
title('BEFORE');
%displays planes 2 BMP
planes2pic = imread('planes2.bmp');
subplot(4, 1, 2);
imagesc(planes2pic);
axis off
title('AFTER');
PROBLEM CODE BEGIN:
%finds the difference between the planes by subtratction, and finds the max
planesDiff = (planes1pic - planes2pic);
subplot(4, 1, 3);
imagesc(planesDiff);
axis off
title('DIFFERENCE');
hold on
%[rowsMax , colsMax] = find(planesDiff == max(planesDiff(:)));
% maxplanesDiff = max(max(planesDiff()));
%[xx , yy] = find(planesDiff == maxplanesDiff);
%plot(xx , yy, '.r');
%lol = find(planesDiff == max(max(planesDiff)));
%plot(lol , '.r');
%%[r, c] = find(planesDiff == max(planesDiff(:)));
%%plot(r , c, '.r');
[xx , yy] = max(max(planesDiff));
%[xx , yy] = find(planesDiff == maxVal);
plot(xx , yy , '.r');
PROBLEM CODE END
%THRESHOLD PORTION
hold off
planesDiff = 255*(planesDiff>=16);
subplot(4, 1, 4);
imagesc(planesDiff);
axis off
title('THRESHOLD');
  4 个评论
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Image Analyst
Image Analyst 2018-9-23
Unfortunately it looks like you STILL forgot to attach 'planes1.bmp' and 'planes2.bmp'.
I'll check back tomorrow for the original, single images, not a composite image of 4 images.

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回答（1 个）

KSSV
KSSV 2018-9-22
编辑：KSSV 2018-9-22
You need not to use find to get the maximum value. max itself gives you the index and value.
[val,idx]=max(I(:));
If you want row and column use ind2sub.
  1 个评论
Image Analyst
Image Analyst 2018-9-22
max() only fives the FIRST max, not ALL of the locations. If you want all the locations where the max occurs, you'll still have to use find().

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