Isolate digits/characters, get bounding boxes

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I am trying to do OCR on some digits. I am able to build up a list with image moments for each character and achieve pretty decent results. However, I am currently isolating each digits almost manually right know, because I am not able to get a bounding box around each digit.

I am using the Java API for openCV, and I was hoping someone could point me in the right direction of how I could isolate the digits, and calculate image moments for each digits.