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  • $\begingroup$ I wonder how do you distinguish your "rectangular" ROI from other "rectangular" items in your picture $\endgroup$ Commented Mar 11, 2013 at 16:04
  • $\begingroup$ Probably center screen, greater area, better edge contrast. $\endgroup$ Commented Mar 11, 2013 at 16:43
  • $\begingroup$ What's making it hard to answer this question is that we don't have a good idea of the scope of the kinds of rectangles that you really want to identify. If it really is just this one, then you can do so by clicking on four points! Do you have a collection of images where we can see the target rectangle(s). $\endgroup$ Commented Mar 20, 2013 at 17:39
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    $\begingroup$ (a) you're not planning to code this in Mathematica eventually, and (b) "Rectangularity" seems poorly defined. Kind of hard to find a good starting point. $\endgroup$ Commented Mar 20, 2013 at 20:08
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    $\begingroup$ @geordie But how to tell apart a rectangle with parallax from a planar parallelogram? Or how to distinguish a rectangle in a 3D scene with perspective vanishing points from a trapezoid in 2D? And how rounded are the corners allowed to be? I think this problem isn't a good fit for this forum. $\endgroup$ Commented Mar 21, 2013 at 3:39