How can i extract desired image from an image?

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In the attached figure, I have to extract the visible part (i.e. rectangular eye part) in order to have focused eye region. I have tried imcrop function and it does what I need. But everytime i have to select the image co-ordinates. I want to do it automatically, like MATLAB itself sense the co-ordinates and extract that focused eye part. I mean there might be some algorithm which can vanish the black part and extract visible one. anybody have idea, how to do it?
cr1=imcrop(fmr_ext1,[500.5 388.5 85 117]);

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Image Analyst
Image Analyst 2015-11-22
You can get the bounding box and then use crop:
measurements = regionprops(grayImage>0, 'BoundingBox');
croppedImage = imcrop(grayImage, measurements.BoundingBox);
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Image Analyst
Image Analyst 2015-11-22
See my own function, attached, written before they came out with bwareafilt().

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