How to Remove Noise

Hello Guys, I'm a newbie in MATLAB and then I have some project. Here are some pictures I transform into a 3D graphic. The result is full of noise. I read there are some filtering images like Gaussian, Laplace, Canny, Sobel etc. But how I can apply them to my picture so it's become better to transform into the 3D plot.

% I use this code to make the 3D plot

a = imread('edge_final.jpg');

b = rgb2gray (a);

surf(b,'EdgeColor','none')

colorbar;

colormap(jet(50));