Given an image `Mat`, and a contour (which is a `MatOfPoint`) in it, how can I create a ROI (Region Of Interest)/submat?
I can see three interesting methods on docs of Mat,
> **Mat submat(int rowStart, int rowEnd,> int colStart, int colEnd)** Extracts a> rectangular submatrix.>> **Mat submat(Range rowRange, Range> colRange)** Extracts a rectangular> submatrix.>> **Mat submat(Rect roi)** Extracts a> rectangular submatrix.
- Is there a way to find out `rowStart`,
`rowEnd`, `colStart` and `colEnd` from the
contour?
or
- Is there a way to get `rowRange` and
`colRange` from the contour?
or
- Can I make a `Rect` from the contour?
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