imlabelMean

Below is a demonstration of the features of the imlabelMean function

Contents

clear; close all; clc;

Syntax

[Q_mean]=imlabelMean(M,ML);

Description

This function takes the mean for each of the labeled groups (NaN's ignored) in ML according to the intensities in M.

Examples

Create example labelled image

% Defining a multi boundary set
r=2; %Sphere radius
rc=3; %Central radius
nr=15;
nc=25;
ptype='quad';
[F1,V1]=patchTorus(r,nr,rc,nc,ptype);
[F2,V2]=quadSphere(2,r,2);
V2(:,2)=V2(:,2)-5;
[F3,V3]=quadSphere(2,r/2,2);
V3(:,2)=V3(:,2)-5;
[F4,V4]=quadSphere(3,r/2,2);
V4(:,1)=V4(:,1)+2;
V4(:,2)=V4(:,2)+2;

[F,V,C]=joinElementSets({F1,F2,F3,F4},{V1,V2,V3,V4});

%Convert to label image
[~,~,ML]=patch2Im(F,V,[],0.1*ones(size(F,1),1));

%Create image to compute stats for these labelled regions
M=nan(size(ML));
c=0;
for q=min(ML(~isnan(ML))):1:max(ML(~isnan(ML)))
    if nnz(ML==q)>0
        c=c+1;
    end
M(ML==q)=c+q/10; %Force data to be <group number>.<label>
end

Compute the mean for each region

[Q_mean,labelSet]=imlabelMean(M,ML)

Q_mean =

    1.0000
    2.2000
    3.3000
    4.4000
    5.5000
    6.6000
    7.7000


labelSet =

     0
     2
     3
     4
     5
     6
     7

GIBBON www.gibboncode.org

Kevin Mattheus Moerman, [email protected]

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License: https://github.com/gibbonCode/GIBBON/blob/master/LICENSE

GIBBON: The Geometry and Image-based Bioengineering add-On. A toolbox for image segmentation, image-based modeling, meshing, and finite element analysis.

Copyright (C) 2006-2023 Kevin Mattheus Moerman and the GIBBON contributors

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

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Published with MATLAB® R2023a