wanna a file for target extractation

I am puzzled by how to extract a target from an image.I hope someone can demonstrate how to extract a target from an image by files.Thank you!!

Answer 1

[Image Analyst]

We call it "segmentation" rather than extractation or extraction. Consider coins as the target. Then look at my BlobsDemo image segmentation tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862