Can you modify the code provided on given link.?

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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..?
  2 Comments
Geoff Hayes
Geoff Hayes on 17 Dec 2014
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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Accepted Answer

Thorsten
Thorsten on 17 Dec 2014
Edited: Thorsten on 17 Dec 2014
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.
  2 Comments
Nimisha
Nimisha on 18 Dec 2014
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 on 18 Dec 2014
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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