plotting an matrix on top of an image

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talayeh tavangar
talayeh tavangar 2020-5-5
评论： S. Walter 2020-5-11
I have an image and I devided it into 10 to 10 matriz and then allocate specific number to each elements. Now, I want to plot the matrix beside or the top of my image, So I can see the number for each elements. can you help me with that?
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talayeh tavangar
talayeh tavangar 2020-5-5
my image is a 600*800 matrix I take an average to make it 10*10 and then allocate specific number to each element
talayeh tavangar
talayeh tavangar 2020-5-5
now I want to show the matrix on the top of my original image

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回答（1 个）

S. Walter
S. Walter 2020-5-5
编辑：S. Walter 2020-5-5
You can plot your image , set your hold to on (https://www.mathworks.com/help/matlab/ref/hold.html) and then plot your 10 x 10 matrix.
% Using the example on https://www.mathworks.com/help/matlab/ref/image.html
C = [0 2 4 6; 8 10 12 14; 16 18 20 22];
% Plot C with scaled mapping
image(C,'CDataMapping','scaled')
% Make a 10x10 matrix
[x,y] = meshgrid(linspace(0.5,4.5,10),linspace(0.5,3.5,10));
% Set the hold to on
hold on
% plot the 10x10 matrix
plot(x,y,'r.')
This should give you the following image:
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talayeh tavangar
talayeh tavangar 2020-5-11
V is a 10 in 10 matrix. When I put v instead of x and y the final picture does not show any thing
S. Walter
S. Walter 2020-5-11
When you take the code I supplied above, does the same problem happen? Do you still show nothing?
Can you confirm that your "v" matrix isn't outside the image boundaries?

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