how to strengthen the image ?
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In a work that explained as "Image strengthening is done by setting pixel to 1 if five or more pixels in its 3-by-3 neighbourhood are 1's; otherwise, set the pixel to 0." I can't understand it how can i code this whether there is a command for this
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I gather you are working with single channel black and white images, i.e. pixel values are either 0 or 1. In that case, what you describe could be coded as follows:
A = round( randn(100,100) ); % example b/w image
A_s = filter2( ones(3,3), A );
A_s = A_s >= 5;
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