Improfile of images in cell array in for loop

Question

lena kappa 2022-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/1694635-improfile-of-images-in-cell-array-in-for-loop

评论： lena kappa 2022-4-12

Hello everyone i want to take the profiles of some images i have stored in a cell array but i can't figure out how to do it

Here is my code:

x = [1 301];
y0 = [1 189];
outLoop = [2,4]
outLoop1 = [1, 3, 5];
for r = 1 : numel(outLoop)
    r = outLoop(r); 
    
    for m = 1 : numel(outLoop1)
    m = outLoop1(m); 
    
plot(improfile(images{1, al, m, 1},x,y0),'LineWidth',2)
    end
end

I get the error :

Unrecognized function or variable 'dx'.

Error in improfile (line 168)

d = bsxfun(@rdivide,pCoordinates,[dx dy]);

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Answer 1

DGM 2022-4-12

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在 MATLAB Online 中打开

I have no idea how your cell array is shaped (is it actually a 4D cell array?) and there's no indication where the variable 'al' came from.

If I have to interpret what this means, I'm just going to assume the cell array is 2D. If it's not, then you'll have to adapt the example.

% read an image, replicate it

A = imread('peppers.png');

images = repmat({A},5,5);

% modify each copy so the profiles vary

for k = 1:numel(images)

images{k} = imnoise(images{k},'gaussian',0,0.01);

end

% path coordinates

x = [1 301];

y = [1 189];

% use at least somewhat meaningful variable names

idxr = [2 4]; % row indices of images

idxc = [1 3 5]; % col indices of images

nr = numel(idxr);

nc = numel(idxc);

k = 1;

for kr = 1:nr

for kc = 1:nc

subplot(nr,nc,k) % put things in separate subplots

improfile(images{idxr(kr),idxc(kc)},x,y);

k = k+1;

end

Passing the output of improfile() to plot() doesn't work like that. Unless you actually specify output arguments, improfile() plots the profile itself. If you want to use plot(), call improfile() separately with an appropriate number of output arguments, then use those outputs to construct something that's appropriate for plot() to use.

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DGM 2022-4-12

在 MATLAB Online 中打开

You could do something like this:

% read an image, replicate it
A = imread('peppers.png');
images = repmat({A},5,5);
% modify each copy so the profiles vary
for k = 1:numel(images)
    images{k} = imnoise(images{k},'gaussian',0,0.01);
end
% path coordinates
x = [1 301];
y = [1 189];
% use at least somewhat meaningful variable names
idxr = [2 4]; % row indices of images
idxc = [1 3 5]; % col indices of images
nr = numel(idxr);
nc = numel(idxc);
for kr = 1:nr
    for kc = 1:nc		
        improfile(images{idxr(kr),idxc(kc)},x,y);
        saveas(gcf,sprintf('profile_%02d_%02d.png',idxr(kr),idxc(kc)))
    end
end