Guassian smoothing

i have a code for an image for corner detection,ten i have to process guassian smoothing,i performed,but image is not displaying

please help to display the imaage

cs = fast_corner_detect_9(im, 60);

size(im)

image(im/6)

axis image colormap(gray)

hold on

axis off

plot(cs(:,1), cs(:,2), 'r.'),title('Corner Detection')

for guassian smoothing G = fspecial('gaussian',[5 5],2);

Ig = imfilter(?,G,'same');

figure,imshow(uint8(Ig)),title('After Guassian Smoothing')

please tell what should come in place of question mark