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storing image blocks as rows in new matrix

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eman
eman am 6 Dez. 2014
Kommentiert: eman am 10 Dez. 2014
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.');
/////
Thanks

Akzeptierte Antwort

Mohammad Abouali
Mohammad Abouali am 6 Dez. 2014
not sure if this is what you want
so
TiledIm = im2col(rgbImage,[blockSizeR blockSizeC],'sliding');
rearranges image blocks in column.
if you want each block as one row then you need to just transpose the results:
TiledIm=TiledIm';
Now the blocks are in row.
  5 Kommentare
Mohammad Abouali
Mohammad Abouali am 9 Dez. 2014
You are welcome. If this answers your question, please accept the answer.
eman
eman am 10 Dez. 2014
Done :)

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