MATLAB: Make images into the same dimensions

Image Processing Toolboxsame dimension images

hello, So i am having trouble making images the same dimensions. I have a library of images and i need help accomplishing this.

i would like to search for the image with the biggest dimensions then have the other images form to that.

i tried useing

imresize(img(i),[376 292], 'bilinear')

just using a base row col but not all of them became the same

Best Answer

Should have worked, as long as you're not really using img(i) (a scalar) to index your images. I assume you mean img{i}, if holding them in a cell array, or something along those lines.

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MATLAB: Resizing cells to the same dimensions

What you originally asked for in http://www.mathworks.com/matlabcentral/answers/122297#answer_129190 (and where you should have posted this instead of to a new thread) was "So can I change the dimensions by somehow filling it up with "fake" zeros?" So that's what I did. I gave you instructions to pad it out with zeros. If you wanted to scale the image instead of pad it, you should have said so. So what you can do is to use imresize:

cellContents = znaki{cellNumber}; % Extract array from this cell.
cellContents = imresize(cellContents, [42,30]); % Resize to 42x30.
znaki{cellNumber} = cellContents; % Stuff back in.

This will, of course, keep the letter centered.

MATLAB: Variable Number of images as inputs and superimpose together? – Homework

You need two loops. One to read in all the images and see what sizes they are and to store the size of the smallest. Then another one where you read them all in and resize them according to the smallest, and sum them. Something like this (untested):

smallestRows = inf;
smallestColumns = inf;
for i = 1:nargin
  thisImage = imread(varargin{i});
  [rows, columns, numberOfColorChannels] = size(thisImage);
  if rows < smallestRows
    smallestRows = rows;
  end
  if columns< smallestColumns
    smallestColumns= columns;
  end
end
theSum = zeros(smallestRows, smallestColumns, numberOfColorChannels);
for i = 1:nargin
  thisImage = imread(varargin{i});
  theSum = theSum + double(imresize(thisImage, [smallestRows, smallestColumns]));
end
imshow(theSum, []);

To make it more robust, check to make sure that all images have the same number of color channels, and if they don't convert the gray scale images to color before summing.

Best Answer

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MATLAB: Resizing cells to the same dimensions

MATLAB: Variable Number of images as inputs and superimpose together? – Homework

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