# gcontour

Below is a demonstration of the features of the gcontour function

## Contents

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

## Syntax

[C,cSiz,cLevel]=gcontour(X,Y,Z,k,pointSpacing,resampleMethod);

## Description

Computes contours for the image with pixel centre coordinates X and Y and intensity Z, at the intensity level k. Contours are resampled using a point spacing equal to pointSpacing using resampleMethod as the interpolation method.

## Examples

Plot settings

```lineWidth=2;
markerSize=25;
fontSize=15;
```

## Example 1: Obtainin a single contour

```S=4;

v=[1 1 1];
siz=[25 65];
[J,I]=meshgrid(1:1:siz(2),1:1:siz(1));
K=zeros(size(I));
[X,Y,Z]=im2cart(I,J,K);

xc=15;
yc=15;
M=exp(-((X-xc).^2 + (Y-yc).^2)./(2*S^2)) + ...
exp(-((X-2.5*xc).^2 + (Y-yc).^2)./(2*S^2)) + ...
exp(-((X-3.5*xc).^2 + (Y-0.75*yc).^2)./(2*S^2)) + ...
exp(-((X).^2 + (Y).^2)./(2*S^2));

contourLevel=0.25;
pointSpacing=0.5;
resampleMethod='pchip';

%Compute contour
VC=gcontour(X,Y,M,contourLevel,pointSpacing,resampleMethod);

[Fm,Vm,Cm]=im2patch(M,true(size(M)),'sk',v);
Vm(:,3)=0;
```

Visualization

```cFigure; hold on;
gpatch(Fm,Vm,Cm);
for q=1:1:numel(VC)
plotV(VC{q},'k.-','LineWidth',lineWidth,'MarkerSize',markerSize)
end
colormap spectral; colorbar;
axis tight; axis equal; box on;
set(gca,'FontSize',fontSize)
drawnow;
``` ## Examples GIBBON www.gibboncode.org

Kevin Mattheus Moerman, [email protected]

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