Average Filter using average

//Average Filter using average
>> orgImg=imread('girl.jpg');
>> filter_1=fspecial('average', [3,3]);
>> filter_2=fspecial('average', [5,5]);
>> filter_3=fspecial('average', [7,7]);
>> filter_4=fspecial('average', [9,9]);
>> subplot(2,2,1),imshow(orgImg);
>> app_filter_1=imfilter(orgImg,filter_1);
>> app_filter_2=imfilter(orgImg,filter_2);
>> app_filter_3=imfilter(orgImg,filter_3);
>> subplot(2,2,2), imshow(app_filter_1);
>> subplot(2,2,3), imshow(app_filter_2);
>> subplot(2,2,4),imshow(app_filter_3);