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Android image processing and obstacle detection

Hi, I'm new to OpenCV and image processing. My objective is to detect obstacles via an android phone, the user carries the phone with him.
I have used canny edge detection(which worked) and tried background subtraction(which didn't work) and am at a loss on what to do next. I need to detect an incoming object. What should I do next to detect an obstacle?
Any help would be much appreciated.