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How to eliminate background in rgb/grayscale so when I convert to binary it wont interfere with my image.

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Kyle Bryenton
Kyle Bryenton 2013-7-16
关闭： MATLAB Answer Bot 2021-8-20
This is the image I am working with: http://imgur.com/8qTnyGq
I am trying to eliminate the background of this image so only the crosshairs, the ball, and the rod remain.
Like this: http://imgur.com/LG3NZTt
In the end I was hoping to have a binary image. I have tried some of the techniques associated with bwmorph and imopen, but none have really helped so far. Perhaps I have overlooked something? Any advice would be greatly appreciated :)

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