You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: remove_gusssian_noise.m
    path of file: ./repos/Digital-Image-Processing/Image Restoration
    
    the code of the file until where you have to start completion: function resimg = remove_gusssian_noise()
  
  % replace `PATH_TO_IMAGE` with actual image file

    
function resimg = remove_gusssian_noise()
  
  % replace `PATH_TO_IMAGE` with actual image file
  impath = 'PATH_TO_IMAGE';
  
  % read image
  img = imread(impath);
  
  % convert rgb image to gray scale only if input image is colormap
  % img = rgb2gray(img);
  
  subplot(1,3,1),imshow(img);
  title('Image with Gaussian Noise','FontSize',18);
  
  % plot histogram for the input image
  subplot(1,3,2),imhist(img);
  title('Histogram','FontSize',18);
  
  % remove guassian noise using guassian filter
  h=fspecial('gaussian',13,.9);
  resimg=imfilter(img,h,'conv');
  
  % plot the results
  subplot(1,3,3),imshow(resimg);
  title('After removing Gaussian Noise','FontSize',18);
  
end