Dice Similarity Coefficient with STL File Input

Hello,

I have two segmented files in STL format. I need to input them into MATLAB and then perform an analysis on them to obtain a Dice Similarity Coefficient (DSC). Can MATLAB even take in STL file inputs? If so, how does it do this and how would I then use them to perform a DSC analysis? I see that MATLAB has the dice() function. Any help would be appreciated!

Answer 1

[Rahul]

Hi @neruk41,

I understand that you wish to read the stl files in MATLAB and then perform analysis to obtain the Dice Similarity Coefficient (DSC). You can consider the following steps:

• Use the 'stlread' function to read the stl files into MATLAB.
• Since this stl data cannot be directly used to calculate DSC, obtain a logical mask of the stl data using 'VOXELISE' and 'logical' functions. Note: VOXELISE is provided by a MATLAB File Excahnge Submission.
• Now to evalue the DSC, use the 'dice' function.

Here is a small example:

fv1 = stlread('file1.stl');
fv2 = stlread('file2.stl');

voxelSize = [128, 128, 128]; % Choose appropriate resolution

mask1 = VOXELISE(voxelSize(1), voxelSize(2), voxelSize(3), 'file1.stl', 'xyz');
mask2 = VOXELISE(voxelSize(1), voxelSize(2), voxelSize(3), 'file2.stl', 'xyz');
% Note: Download VOXELISE from MATLAB File Exchange and add to path

mask1 = logical(mask1);
mask2 = logical(mask2);

dsc = dice(mask1, mask2);

The following MathWorks documentations and File Exchange submission can be referred:

'stlread': https://www.mathworks.com/help/matlab/ref/stlread.html

'Mesh Voxelization' (File Exchange) : https://www.mathworks.com/matlabcentral/fileexchange/27390-mesh-voxelisation

'logical': https://www.mathworks.com/help/matlab/ref/logical.html

'dice': https://www.mathworks.com/help/images/ref/dice.html

Thanks.