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2016-01-16 13:50:17 -0500 asked a question How to get real world 2D coordinates of rectified pixels?

Hello, I have a system with a camera looking vertical on a table and there is a robot with a target. I already have the camera calibrated and i have the extrinsic and intrinsic values and get a rectified image. Now i compute the mass center of the target and get its values (u,v).

My question now is how do i get the real 2D (x,y) world coordinates? I don't need the z value because it has always the same z value (10 cm). Could anyone explain it to me please?

2016-01-13 10:01:17 -0500 asked a question Why pixels can have float values?


This may be a simple question, but i wonder why pixel values can have float values? I'm tracking a target and get the mass center with contours() and moments() method and if i want i can get float values of them.

But why is this even possible? An image can't have a 0.1234 Pixel. Can anybody explain this to me please?

2016-01-13 05:16:43 -0500 asked a question How to find the corners of a rectangular contour in pixel points?


i want to know how i can find the pixel postion of the corner points of a rectangular contour? With findcontours() and moments() i find the mass center of the contour but know i need the corner points.

Or even better is there a possibility to find the the angular orientation of the rectangle?

Please help it's important for me.