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Nancy
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Plotting centroid values

Asked by Nancy
on 3 Jul 2011
Hey Guys,
I find the centroid values in an image using the regionprops command. I am able to plot the centroids on the image as well. Could anyone tell me how I can include the centroid values beside the plot. i.e. if the centroid of my image is at (3,3), i want to plot the centroid and display the value along with it. I am able to do the former and I need help with the latter.
Nancy

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Paulo Silva
Answer by Paulo Silva
on 3 Jul 2011
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Paulo Silva
on 3 Jul 2011
can you explain better what do you want? 'centroid values besides the plot'
Nancy
on 3 Jul 2011
Say in a figure, a point G denotes the centroid. I know the value of the centroid to be (3,3). I want this value to be displayed near the point G on my figure.
Paulo Silva
on 3 Jul 2011
In the link that I posted you have
x = s(k).Centroid(1);
y = s(k).Centroid(2);
text(x, y, sprintf('%d', s(k).ClassNumber), 'Color', 'r', ...
'FontWeight', 'bold');
Instead of that code do
x = s(k).Centroid(1);
y = s(k).Centroid(2);
text(x+d,y,' \leftarrow G','FontSize',18) %where d is the distance from the point
If you want to have many centroids at the same vertical point just define a constant x+d and they will be all aligned

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