what happens if i increase the kernel to 5x5 or to 7x7?is there anyway to write that in matlab code.?

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Sat m
Sat m 2013-3-5
i am trying to do a programming for what happens when we increase a kernel to 5x5 or to 7x7. please let me know how to do the matlab programming
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Sat m
Sat m 2013-3-5
i do not have any code so far.... i am searching for code to increase kernel size so far....still working on that....can you help me please?
Sat m
Sat m 2013-3-5
this is my code...but it is not working. i am trying to increase the kernel to 5x5 so that the image can be blurred
baseFile = 'violet.bmp';
origimage = imread('violet','bmp');
origimage = origimage(:,:,1);
figure, imagesc(origimage)
axis square
colormap gray
title('Original Image')
set(gca, 'XTick', [], 'YTick', [])
%Blur Kernel
ksize = 5;
kernel1 = zeros(ksize);
%Gaussian Blur
s = 3;
m = ksize/2;
[X, Y] = meshgrid(1:ksize);
kernel = (1/(2*pi*s^2))*exp(-((X-m).^2 + (Y-m).^2)/(2*s^2));
%Display Kernel
figure, imagesc(kernel)
axis square
title('Blur Kernel')
colormap gray
%Embeding kernel in image that is size of original image
[h, w] = size(origimage);
kernelimage = zeros(h,w);
kernelimage(1:ksize, 1:ksize) = kernel;
%Performing 2D FFTs
fftimage = fft2(double(origimage));
fftkernel = fft2(kernelimage);
%Set all zero values to minimum value
fftkernel(fftkernel == 0) = 1e-6;
%Multiply FFTs
fftblurimage = fftimage.*fftkernel;
%Perform Inverse 2D FFT
blurimage = ifft2(fftblurimage);
%Display Blurred Image
figure, imagesc(blurimage)
axis square
title('Blurred Image')
colormap gray
set(gca, 'XTick', [], 'YTick', [])

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采纳的回答

Image Analyst
Image Analyst 2013-3-5
For example, to create median filtered images:
filtered5x5Image = medfilt2(grayImage, [5, 5]);
filtered7x7Image = medfilt2(grayImage, [7, 7]);
Call imshow() to display the results.

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