How create a filter? (Mean, mode, median)

Someone can help me to create roles for the filter:

Mode Mean Median

Thanks.

Answer 1

[Image Analyst]

Try mode(), conv() or smooth(), and medfilt1().

Not sure what a "role" is - please explain. And say whether your filter has some window width.

[Image Analyst]

Ha's reply moved from "Answer" to here:

It is for an academic work, I have a program (GUI) which have to implement the filter, mode, mean and median. The problem is that I do not know how to implement, also have to do the translation through a slider but do not know how to prepare.

[Image Analyst]

Look for examples in the help. For examples:

smoothedSignal = conv(yourSignal, ones(1,31)/31, 'same');
smoothedSignal  = medfilt1(yourSignal, 31);

[Ha]

Is that all? In class for the middle did the following:

function imgOut = filtroMedia (imgIn)

    imagemDouble = im2double(imgIn);

    for i=1:size(imagemDouble,1)
        for j=1:size(imagemDouble,2)
            for k=1:size(imagemDouble,3)
                %i,j; i,j+1; i,j-1; i-1,j; i+1, j;
                vetor =0;
                numeroPosi =0;
                if(i>1)
                    vetor = vetor + imagemDouble(i-1,j, k);
                    numeroPosi = numeroPosi +1;
                end

                if(j-1>0)
                    vetor = vetor +imagemDouble(i,j-1, k);
                     numeroPosi = numeroPosi +1;
                end

                if(i+1<0)
                   vetor = vetor + imagemDouble(i+1,j, k);
                   numeroPosi = numeroPosi +1;
                end

                if(j+1<0)
                    vetor = vetor + imagemDouble(i, j+1, k);
                     numeroPosi = numeroPosi +1;
                end

                vetor = vetor+ imagemDouble(i, j, k);
                vetor = vetor/numeroPosi;
                imgOut(i,j,k) = vetor;

            end
        end
    end
     imshow(imgOut);  
end

[Image Analyst]

You don't need to do all that - there's a built in function for 2D median: medfilt2().