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Hey cerebraldad,
I think here are at least two issues. The one that you paste here is that you are having an issue with your image or what it look like, lacking having one. You should search for OpenCV Error: Assertion failed and you will find a lot of similar issues and ideas on how to solve it.
Second, ros is not blocking your new opencv install but is more likely that it does not know where your new installation is. There are multiple ways how to solve it. One temporarily solution is that project`s CMakeList.txt should include these two lines
set(OpenCV_DIR /path/to/new/opencv/build)
find_package( OpenCV REQUIRED )
Best Andrej
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