create a function to generate a maximum intensity projection, mip, through a 3d volume along a specified axis in matlab

main.m
function [MIP] = generateMIP(volume, axis)
% volume: a 3D volume 
% axis: the axis along which to create the MIP, either 1, 2, or 3 (x, y, or z)

% Get size of volume
[v_height, v_width, v_depth] = size(volume);

% Initialize the MIP image
if axis == 1
    MIP = zeros(v_width, v_depth);
elseif axis == 2
    MIP = zeros(v_height, v_depth);
elseif axis == 3
    MIP = zeros(v_height, v_width);
end

% Create the MIP by iterating over the specified axis, taking the maximum 
% intensity for each pixel along that axis and setting it in the MIP image.
for i = 1:v_depth
    if axis == 1
        MIP(:, i) = max(squeeze(volume(:, :, i)), [], 2);
    elseif axis == 2
        MIP(:, i) = max(squeeze(volume(:, :, i)), [], 1);
    elseif axis == 3
        MIP(:, i) = max(squeeze(volume(:, :, i)), [], 1);
    end
end
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main.m
% Load a sample MRI brain volume
load mri

% Generate MIP
MIP = generateMIP(D, 1);

% Display MIP
imshow(MIP, []);
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