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now letamp;#39;s assume that we want to apply median filter to these two pixels this pixel and this pixel now letamp;#39;s assume that we will be using a three by three mask this green mask and what we have to do is simply we should put the middle cell of the mask on the required pixel which is this pixel now as you see we have one two three four five we have five pixels outside the image so we have five pixels in the mask outside the image so what you have to do is simply you should put in these cells zeros like this then sort the numbers in the mask ascendingly or descendingly i will sort it ascendingly so i will put the five zeros these five zeros then eight and eight eight and eight nine nine then twelve like this then take the middle number so this is the middle number in these numbers because we have at the right side four numbers and at the left side four numbers also so this is the middle number so this cell will be zero by using the median filter now letamp;#39;s apply the