rgb2gray by 5*5 vicinity marix

hello world

I apologize in advance for the weakness of my speech

I am writing a code for the university but I got stuck and I ask you dear ones for help.

In this code we want to blur the image with a 5 * 5 matrix using rgb2gray.

A series of codes have been written that are wrong with my figure.

Please correct it for me.

Thankful

[filename, pathname]=uigetfile('*.*','Select the image file');
Address=strcat(pathname,filename);
a=imread(Addres);
a=double(rgb2gray(a));
a2=zeos(size(a));
w=[1,1,1,1,1;1,1,1,1,1;1,1,1,1,1];

for x=3:size(a,1)-2
    for y=3:size(a,2)-2
        a2(x,y)=(w(1,1)*a(x-2,y-2)+w(1,2)*a(x-2,y-1)+w(1,3)*a(x-1,y+1)
    end
end

Answer 1

[DGM]

Errors aside, this doesn't even look complete.

[filename, pathname]=uigetfile('*.*','Select the image file');
Address=strcat(pathname,filename);
a=imread(Addres);
a=double(rgb2gray(a))

a2=zeros(size(a)); % typo
%w=[1,1,1,1,1;1,1,1,1,1;1,1,1,1,1]; % this is not 5x5
w = ones(5)/25; % this is a 5x5 flat filter

for x = 3:size(a,1)-2
    for y = 3:size(a,2)-2
        % 1: mismatched parentheses
        % 2: this only addresses 3 of the 25 pixels in the window
        % 3: this will leave a 3px black border around the image 
        a2(x,y) = w(1,1)*a(x-2,y-2) + w(1,2)*a(x-2,y-1) + w(1,3)*a(x-1,y+1)
    end
end

In order to avoid #3, you need to pad the edges or conditionally crop the filter. Consider the example:

% example image
inpict = im2double(imread('cameraman.tif'));

filtersize = [5 5];

% pad the image
padsize = floor(filtersize/2);
paddedimage = padarray(inpict,padsize,'replicate','both');

% make flat filter
fk = ones(filtersize)/prod(filtersize);

s0 = size(inpict);
outpict = zeros(s0,class(inpict));
os = filtersize-1; 

for m = 1:s0(1)
    for n = 1:s0(2)
        sample = paddedimage(m:(m+os(1)),n:(n+os(2)));
        outpict(m,n) = sum(sample.*fk,'all');
    end
end

% show that result is the same as using imfilter()
referenceimage = imfilter(inpict,fk);
immse(outpict,referenceimage)

ans = 9.7586e-04

imshow(outpict)

[Ali Azizi]

How kind you are to

thanks you

it`s work

How kind you are to help me. help me.