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Defined an object on photo observed at a certain angle. Appreciate its size.

asked 2013-04-25 12:15:43 -0500

Pavel Ivanov gravatar image

updated 2013-04-25 12:18:39 -0500

Guys, plese, lost last chance to find some information, help!

There is a problem: Given an object on photo observed at a certain angle. Appreciate its size.

How can I solve this problem with a computer vision and OpenCV? I know about photogrammetry, which assesses the pictures, but I think that I'm not sure that it is that I'm looking for. What can you suggest to me? P.S. If possible, please provide your answer some examples of open source software or code, if anybody know.

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answered 2013-04-25 12:55:35 -0500

Rogeeeer gravatar image

If you know the angle and the distance to the considered object and the camera (calibration) pparameters you can apply some funny geometry :

http://answers.opencv.org/question/1149/focal-length-and-calibration/

But it's a complex problem covering as far as I know a lot of computer vision subjects. You can't really assume that, taking in consideration the fact that the real world is 3D + perspective, you have a simple linear transformation between 2D photo and the objects represented.

You can read http://research.microsoft.com/apps/pubs/default.aspx?id=67278 :)

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Like he said. Also, this forum is not a 'i need a code for my project please' forum. Read the FAQ to see what we stimulate. Own efforts will be helped much faster.

StevenPuttemans gravatar imageStevenPuttemans ( 2013-04-26 03:18:30 -0500 )edit
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Asked: 2013-04-25 12:15:43 -0500

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Last updated: Apr 25 '13