Selecting a ROI manually in Matlab

Question

I'm trying to select a user-defined area and fill with 1s, preferably with mouse input. Any suggestion how? Thanks.

Answer 1

The command

roipoly

does exactly what you're looking for.

Answer 2

You'll need the Image Processing Toolbox to use roipoly as Georg suggested.

If you don't have that, you could try creating a rubber band box using

rbbox

There's a good example in the help. You might need to fiddle with units depending on how you're displaying your data. Remember to click and hold, drag and release..

Answer 3

h=impoly;

This code helps you to select a closed polygon of the image.