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cvProjectPoints2 :ImagePoints units

asked 2013-04-23 09:29:43 -0600

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Hi i used cvProjectPoints2 function to do the projection of a 3D points into 2D points.Now i get the 2D imagePoints(for example:image1.x=-663.450623 and image1.y=101.231941), and i wonder,on which units it's expressed: px or mm? How can i check if the results are raisonnable or not. Thank you in advance.

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answered 2013-04-23 11:29:37 -0600

As far as I know, it all depends on which unit's are used for the parameters. If the camera matrix and input data all has measurements in mm's, then the output will also be in mm's. If the parameters are defined in inches, than the output will also be in inches, same for pixels.

However, in image processing, mostly people define their distances in pixels, because that is the measure used to loop through your data, pixel by pixel. So I would stick to that.

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Asked: 2013-04-23 09:29:43 -0600

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Last updated: Apr 23 '13