Help with using SURF to analyze an image?

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Taylor Gates 2018-7-13

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回答： Image Analyst 2018-7-14

So I am trying to analyze and image using "surf" to make a 3D plot whose z value is the gray scale, where darker image will have lower z (Black is 0, White is 255). How would I use surf to analyze an image like that?

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Rik 2018-7-13

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在 MATLAB Online 中打开

What your goal is, is not really clear to me, but you can use the code below to view an image as a surf. I used an example image packaged with the IPT, so if you don't have that toolbox, you'll have to use your actual image.

figure(1),clf(1)
peppers = double(imread('peppers.png'));
IM=peppers(:,:,1)*.3+peppers(:,:,1)*.6+peppers(:,:,1)*.1;
[X,Y]= meshgrid(1:size(IM,2),size(IM,1):-1:1);
surf(X,Y,IM,'EdgeColor','none')
colormap('gray')
view(10,90)

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Taylor Gates 2018-7-14

for example. If I delete the last line of the code you provided, it should display (in mine at least) a 3D surf of the grayscale. That is what I was trying to get.

Rik 2018-7-14

Just to clarify: you can still 3D rotate this. The line with view just sets the camera to a point where you can easily recognize the image.

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Image Analyst 2018-7-14

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Perhaps you'd like meshcanopy: https://www.mathworks.com/matlabcentral/fileexchange/29485-meshcanopy

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Image Analyst 2018-7-13

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You wouldn't. The surf() function in base MATLAB just for visualization of smooth images, as opposed to SURF from the Computer Vision System Toolbox. The surf() function is not very good for visualizing rough images, and no good at all for analysis. See my Image Segmentation Tutorial in my File Exchange for an intro to image analysis.