Plot pixels from 2D boolean array

2019 11 30
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回答已采纳
更新时间：2019 12 2
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I have a 2D boolean array stored 0s and 1s where I want to plot a red pixel. For example, If the 2D boolean array has 1 for (20, 20) location, it should plot a red pixel at that location. Else, it is has 0, it should not plot the red pixel.
Can someone help me?

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Stephan
Stephan 2019-11-30

0 个投票

% your array
A = randi(2,101)-1;
% the result;
R=255*ones(101);
G=255*(-A+1);
B=255*(-A+1);
res = cat(3,R,G,B);
% plot result
imshow(res)

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Radhika Kulkarni
Radhika Kulkarni 2019-11-30
shouldn't there be a loop to check each location of 2D Boolean array?
Stephan
Stephan 2019-11-30
No need for a loop - this is vectorized code.
Radhika Kulkarni
Radhika Kulkarni 2019-11-30
编辑：Radhika Kulkarni 2019-11-30
Great! It worked.
Now, It is plotting my image from the array. I need to rotate the axes by 135 deg CCW. How do I do that?
See the attachment. I need to rotate this by 135 deg CCW.
Stephan
Stephan 2019-11-30
编辑：Stephan 2019-11-30
If you have Image Processing Toolbox use imrotate. If not see FEX to download a tool.

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更多回答（2 个）

Radhika Kulkarni
Radhika Kulkarni 2019-11-30

0 个投票

One more thing, I need to put this in a some time refresh loop, so it grows in size and back to normal size. Like pumping heart.

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Stephan
Stephan 2019-11-30
On File Exchange there are also tools to create gif animations. Maybe you want to use this.

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Radhika Kulkarni
Radhika Kulkarni 2019-12-2

0 个投票

How can I also show the x & y axis and ticks and axis data points to plot along with this vectorized code?

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