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: getoffset.m
    path of file: ./repos/Computer-Vision-and-AI/Image-Alignment
    
    the code of the file until where you have to start completion: function [a] = getoffset(B, I)
% getoffset- determine how much the image needs to be shifted in order
%  to apprear correctly colored
%
% INPUTS
%   B - base image
%   I - image to move
% OUTPUTS
%   y - vertical displacement
%   x - horizontal displacement

% TJ Keemon <keemon@bc.edu>

    
function [a] = getoffset(B, I)
% getoffset- determine how much the image needs to be shifted in order
%  to apprear correctly colored
%
% INPUTS
%   B - base image
%   I - image to move
% OUTPUTS
%   y - vertical displacement
%   x - horizontal displacement

% TJ Keemon <keemon@bc.edu>
% October 2007

min = inf; %set so that first value will be less than sum
for b = -20:20 %vertical displacement
    for c = -20:20 %horizontal displacement
        I2 = circshift(I, [b c]);
        sum = ssd(B, I2); %ssd between green and other color
        if sum < min
            min = sum;
            a = [b c];
        end