storing image blocks as rows in new matrix

Question

eman 2014-12-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/165701-storing-image-blocks-as-rows-in-new-matrix

评论： eman 2014-12-10

I have the following code that takes ten images and divide every image to (16*16) block using im2col function.The question is I need to store all the blocks that have been generated from the ten images in a matrix so i can use it to apply k-means.

How can I do that?

    clc; 
   close all;  % Close all figures (except those of imtool.)
   workspace;  % Make sure the workspace panel is showing.
   fontSize = 20;
   % Read image.
   TrnImgPath='G:\Iman\UIUC\PNGImages\TrainImages\';
   for i=1:10
   rgbImage=[TrnImgPath 'pos-' num2str(i) '.PNG'];%Reading positive Pictures
   rgbImage=imread(rgbImage);
   % Display image full screen.
   imshow(rgbImage);
   % Enlarge figure to full screen.
   %Set Handle Graphics object properties
   set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
   %gcf means'Current figure handle'
   drawnow; %Flush event queue and update figure window
   % Get the dimensions of the image.  numberOfColorBands should be = 3.
   [rows columns numberOfColorBands] = size(rgbImage)
   blockSizeR = 16; % Rows in block.
   blockSizeC = 16; % Columns in block.
   TiledIm = im2col(rgbImage,[blockSizeR blockSizeC],'sliding');
   % Now display all the blocks.
   plotIndex = 1;
   numPlotsR = size(TiledIm, 1);
   numPlotsC = size(TiledIm, 2);
   for r = 1 : numPlotsR
        for c = 1 : numPlotsC
           fprintf('plotindex = %d,   c=%d, r=%d\n', plotIndex, c, r);
    % Specify the location for display of the image.
    subplot(numPlotsR, numPlotsC, plotIndex);
    % Extract the numerical array out of the cell
    % just for tutorial purposes.
    rgbBlock = TiledIm(r,c);
    imshow(rgbBlock); % Could call imshow(TiledIm{r,c}) if you wanted to.
    [rowsB columnsB numberOfColorBandsB] = size(rgbBlock);
    % Make the TiledImption the block number.
    TiledImption = sprintf('Block #%d of %d\n%d rows by %d columns', ...
        plotIndex, numPlotsR*numPlotsC, rowsB, columnsB);
    title(TiledImption);
    drawnow;
    % Increment the subplot to the next loTiledImtion.
    plotIndex = plotIndex + 1;
   end
   end
 % Display the original image in the upper left.
  subplot(4, 6, 1);
   imshow(rgbImage);
   title('Original Image');
   end
     msgbox('Done!  Check out the figures.');
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