# logicRemoveInterior

Below is a demonstration of the features of the `logicRemoveInterior` function

## Contents

```
clear; close all; clc;
```

## Syntax

`[Lb]=logicRemoveInterior(L);`

## Description

This function removes the interior entries for the input logic L. Interior entries are those fully surrounded by neighbours (e.g. in 3D all entries which are attached to a top, bottom, left, right, front, and a back neighbour). Vectors and n-dimensional arrays are supported.

## Examples

## Example 1: 1D logical treatment

L = false(12,1); L(3:10)=1;

[Lb]=logicRemoveInterior(L); [Lb]=logicRemoveInterior(L);

cFigure; subplot(1,2,1); imagesc(L); axis tight; axis equal; colormap gray; subplot(1,2,2); imagesc(Lb); axis tight; axis equal; colormap gray; drawnow; cFigure; subplot(1,2,1); imagesc(L); axis tight; axis equal; colormap gray; subplot(1,2,2); imagesc(Lb); axis tight; axis equal; colormap gray; drawnow;

## Example 2: 2D logical treatment

r=2; n=25; x=linspace(-1.5*r,1.5*r,n); [X,Y]=ndgrid(x); R = sqrt(X.^2+Y.^2); L = R<=r;

[Lb]=logicRemoveInterior(L);

cFigure; subplot(1,2,1); imagesc(L); axis tight; axis equal; colormap gray; subplot(1,2,2); imagesc(Lb); axis tight; axis equal; colormap gray; drawnow;

## Example 3: 3D logical treatment

r=2; n=25; x=linspace(-1.5*r,1.5*r,n); [X,Y,Z]=ndgrid(x); R = sqrt(X.^2+Y.^2+Z.^2); L = R<=r;

```
[Lb]=logicRemoveInterior(L);
%Force half to be zero so we can look inside
L(:,:,ceil(n/2):end)=0;
Lb(:,:,ceil(n/2):end)=0;
```

[F,V,C]=im2patch(L,L); [Fb,Vb,Cb]=im2patch(Lb,L); cFigure; subplot(1,2,1); gpatch(F,V,C); axisGeom; colormap gray; clim([0 1]); camlight headlight; subplot(1,2,2); gpatch(Fb,Vb,Cb); axisGeom; colormap gray; clim([0 1]); camlight headlight; drawnow;

* GIBBON* www.gibboncode.org

*Kevin Mattheus Moerman*, [email protected]

**GIBBON footer text**

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.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.