Manually selecting regions of an image

I have a MATLAB GUI interface program, and one of the things that it does is display a grayscale image and separate it into regions based on a threshold. I want to be able to manually modify the regions. Is there a way to get where the cursor clicks on an image in a GUI? Is there click-and-drag support?

Answer 1

[Image Analyst]

How do you want to manually modify the regions? If it's by thresholding, I have an interactive thresholding app in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

[Mitchell]

The thresholding method works fine most of the time, but sometimes it is wrong. For example, I want to threshold my image to make two masks. I want a way to correct parts of the image that are above the threshold to be in the lower mask, because they are bright features in the region with the dark mask.

[Image Analyst]

You forgot to tell me the URL of your image. My app is just a simple single threshold that applies to the whole image. You may need to have a threshold that adapt locally. I can't tell because I can't see your image.