how to do windowing in image using matlab?

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Sheema Khattak
Sheema Khattak 2014-7-3
评论： Image Analyst 2014-7-7
how to do windowing in image using matlab?
  2 个评论
SRI
SRI 2014-7-3
Hi shah Could you please clear with your question so that we can assist you with the solution
Sheema Khattak
Sheema Khattak 2014-7-4
Hello!
I am talking about the window filter in image which works portion by portion in an image.Divide the pixels of an image into frames or blocks to work on it and these blocks are made on the basis of similarity of pixels and its neighbors.thank you

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回答（2 个）

Image Analyst
Image Analyst 2014-7-4
Try conv2(), imfilter(), or nlfilter(), or blockproc() depending on exactly what you want to do. conv2() and imfilter() are for linear filters. nlfilter is for any bizarre custom function you want write and apply to each window. blockproc() is if you want to process windows in "jumps" where it moves from one location to the next by more than 1 pixel.
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Sheema Khattak
Sheema Khattak 2014-7-7
Would conv2() and imfilter() work on the basis of similarity of pixels and group the similar ones to form a clump of object or not?
Image Analyst
Image Analyst 2014-7-7
No. To do that you need to do connected components labeling. But even before that you need to do image segmentation to find the "objects". See my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

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SRI
SRI 2014-7-7
clc;
close all;
input = imread('cameraman.tif');
[row,col] = size(input);
% minValue = mean(mean(input));
for i = 2:row-1
for j =2:col-1
outImage(i-1:i+1,j-1:j+1) = input(i-1:i+1,j-1:j+1)
% if outImage(i-1:i+1,j-1:j+1) < minValue % outImage(i-1:i+1,j-1:j+1) = 1;
% end
end
end
Hi shah you just apply any filter operation with this code because this will divide a image into 3 *3 matrix after that you can process as you wish

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