Can you modify the code provided on given link.?

2014 12 17
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更新时间：2014 12 18
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http://www.mathworks.com/matlabcentral/answers/85529-how-to-replace-the-center-pixel-of-a-3x3-window-with-the-min-difference-among-its-surronding-pixels
My question is related with above link.
I want to replace the center pixel of a 3x3 window filter with the average of four neighbour pixels in 3 x 3 neighbourhood.
Can anyone modify code provided on that link..?

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Geoff Hayes
Geoff Hayes 2014-12-17
Nimisha - which four of the 3x3 neighbourhood do you wish to average? The ones at the north, south, east, and west of the centre pixel?

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Thorsten
Thorsten 2014-12-17
编辑：Thorsten 2014-12-17

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Just convolve your data with the filter
F = [0 1 0; 1 0 1; 0 1 0]/4;
You can use imfilter for the convolution.

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Nimisha
Nimisha 2014-12-18
clear all;clc
grayImage = imread('Coins.jpg');
image1 = conv(grayImage, ([0 1 0; 1 0 1; 0 1 0]/4) , 'same');
imshow(image1)
it shows following error
Error using conv (line 27)
A and B must be vectors.
Error in Question_11_3_c (line 3)
image1 = conv(grayImage, ([0 1 0; 1 0 1; 0 1 0]/4) , 'same');
How to correct for given problem.?
Geoff Hayes
Geoff Hayes 2014-12-18
The error message is telling you that your inputs to conv must be vectors. You are passing matrices. Try using conv2 instead.

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