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camera matrix differs from given example in ROS

asked 2016-03-17 09:14:05 -0500

btaher20 gravatar image

updated 2016-03-17 10:03:41 -0500

Mehdi. gravatar image

Hi everybody
I am using Logitech and I got camra calibrated results

camera matrix
512.674949 0.000000   315.382678
0.000000   510.413978 205.677427
0.000000   0.000000   1.000000

projection
511.625946       0.000000       313.445886   0.000000
0.000000         511.368134     204.690908   0.000000
0.000000         0.000000       1.000000     0.000000

distortion
0.047498 -0.123536 -0.000940 -0.002017 0.0000

board size : 15 by 11 and square 70 mm or 0.007 m Could any body tell me that results is acceptable with this parameters.

Best Taher

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answered 2016-03-17 09:59:47 -0500

Mehdi. gravatar image

updated 2016-03-17 12:49:12 -0500

Of course it differs, even if you use two similar cameras the result would probably be slightly different. Those values describe

  • The properties of the lens mounted on the camera
  • The pixel size on the CMOS sensor and the offset of the central point

It is impossible to say if the results are acceptable or not, the only thing you can do is to check the reprojection error showed by your calibration program (the smaller the better) and to take a look at the undistorted image. Try to point your camera at straight lines in the real world (in the ceiling or floor for example), they should still appear as straight lines in your undistorted image and the distortion observed on the raw image should have been rectified.

And those values seem to be normal values, nothing weird.

Read this introduction for a better understanding of your camera.

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We considered a reprojection error of below 0.5 (half a pixel) as acceptable when calibrating cameras on the PR2 at Willow Garage.

ahendrix gravatar image ahendrix  ( 2016-03-17 12:45:53 -0500 )edit

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Asked: 2016-03-17 09:14:05 -0500

Seen: 126 times

Last updated: Mar 17 '16