Apply Gaussian Filter

//Apply Gaussian Filter
>> orgImg=imread('cameraman.tif');
>> filter_1=imnoise(orgImg, 'gaussian' , 0.0005, 0.0019);
>> filter_2=fspecial('average',3);
>> app_filter_1=imfilter(filter_1,filter_2);
>> subplot(1,3,1), imshow(orgImg);
>> subplot(1,3,2), imshow(filter_1);
>> subplot(1,3,3), imshow(app_filter_1);