Plot the image intensities in 3D plot.

Question

Lizan 2012-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/51115-plot-the-image-intensities-in-3d-plot

评论： Osman 2014-11-10

Hi,

I have stored images in an array, example of the first image is

myPict{1,1}{1,1}

and the second,

myPict{1,1}{1,2} or myPict{2,1}{1,1}

Not important, anyways,..

I would like to plot the pixel intensity in a 3D plot. How can I do this?

I tried with,

y = 1:480; x = 1:640; [x,y] = meshgrid(x,y); surface(x,y,myPict{1,1}{1,1}(:,:,1))

but I only get an empty figure.

Anyone know what the problem is?

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Answer 1

Image Analyst 2012-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/51115-plot-the-image-intensities-in-3d-plot#answer_62291

在 MATLAB Online 中打开

Try this:

rgbImage = myPict{1,1}{1,1}(:,:,1);
[rows columns numberOfColorChannels] = size(rgbImage)
figure;
imshow(rgbImage);

what does it say in the command window for the size of the image? Does it show any 2D color image in the axes of the new figure?

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Image Analyst 2012-10-17

在 MATLAB Online 中打开

OK - it's actually a monochrome (grayscale) image. What does this say

class(rgbImage)

If it says single or double, do this

imshow(rgbImage, []);

See if that will show something.

Osman 2014-11-10

% Convert your image to double scale then plot using surf or mesh.. I = imread('your image'); J = double(I); % if the image is RGB convert to gray scale. % Displaying x1 = 640; % Number of row y1 = 480; % Number of column [x,y] = meshgrid(1:y1,1:x1); figure, Surf(x,y,J)

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