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2018-05-04 02:31:17 -0500 asked a question Strange ArUco behavior / OpenCV SolvePnp

Strange ArUco behavior / OpenCV SolvePnp Hi There, I tested the accuracy of ArUco markers in severeal distances and use

2018-02-28 04:57:04 -0500 asked a question How can I get the accuracy between two angles (euler or other)?

How can I get the accuracy between two angles (euler or other)? Hi Together, I have a board of marker and detect their

2018-01-24 02:17:55 -0500 commented question Aruco Detection - OpenCV Error: Incorrect size of input array

Thank you. That was the problem :). (Sometimes the little things are the worst in programming :D )

2018-01-23 08:53:19 -0500 asked a question Aruco Detection - OpenCV Error: Incorrect size of input array

Aruco Detection - OpenCV Error: Incorrect size of input array Hi There, I try to detect my ArUco markers with this post

2017-12-30 05:31:03 -0500 marked best answer What is the focal length for computer generated pictures?

Hi there,

I am generated some rotated ArUco markers in MatLab and want to get the rotation as normal with OpenCV and C++. The detection algorithm needs of course the camera matrix and the distortion model. The distortion model is easy to have for a perfect camera should be k1,k2,p1,p2,k3 = 0, am I right? The camera matrix offers me a bigger problem... what ist the focal length f (I assume fx=fy). I set the displacements zero: c=cx=cy=0. Now my Camera Matrix should be something like that:

M= [ f, 0, 0;
0, f, 0;
0, 0, 1]

Can anybody tell me, what focal length should be used? In meanwhile I tried to calibrate it with a perfect picture of the (in my case) CharUco Board. (For the CharUco board is an additional avg_reprojection_error, I guess this should be also 0?)

I hope you can help me :) Greetings Sarah

2017-12-30 05:31:03 -0500 received badge  Scholar (source)
2017-12-30 03:48:40 -0500 commented answer What is the focal length for computer generated pictures?

Thank you very much!!! That is exactly what I am looking for and it worked perfectly :-). Do you know how to handle with

2017-12-30 03:45:45 -0500 commented answer What is the focal length for computer generated pictures?

Thank you very much!!! That is exactly what I am looking for and it worked perfectly :-).

2017-12-30 03:04:42 -0500 received badge  Enthusiast
2017-12-29 10:34:42 -0500 edited question What is the focal length for computer generated pictures?

What is the focal length for computer generated pictures? Hi there, I am generated some rotated ArUco markers in MatLab

2017-12-29 10:34:15 -0500 edited question What is the focal length for computer generated pictures?

What is the focal length for computer generated pictures? Hi there, I am generated some rotated ArUco markers in MatLab

2017-12-29 10:00:42 -0500 asked a question What is the focal length for computer generated pictures?

What is the focal length for computer generated pictures? Hi there, I am generated some rotated ArUco markers in MatLab

2017-12-13 09:29:27 -0500 commented question Why is the Charuco Board Calibration so much better against a flipping Z-Axis then the normal OpenCV chessboard?

A big thank to you! I hope it will help other people to calibrate with CharUco instead of the "normal" chessboard :)

2017-12-13 07:13:53 -0500 commented question Why is the Charuco Board Calibration so much better against a flipping Z-Axis then the normal OpenCV chessboard?

Thank you for your response. I am not able to post a picture but I am uploaded it here: http://www.bilder-upload.eu/sho

2017-12-13 07:12:01 -0500 edited question Why is the Charuco Board Calibration so much better against a flipping Z-Axis then the normal OpenCV chessboard?

Why is the Charuco Board Calibration so much better against a flipping Z-Axis then the normal OpenCV chessboard? Hi Toge

2017-12-13 07:10:52 -0500 received badge  Editor (source)
2017-12-13 07:10:52 -0500 edited question Why is the Charuco Board Calibration so much better against a flipping Z-Axis then the normal OpenCV chessboard?

Why is the Charuco Board Calibration so much better against a flipping Z-Axis then the normal OpenCV chessboard? Hi Toge

2017-12-12 03:38:18 -0500 asked a question Why is the Charuco Board Calibration so much better against a flipping Z-Axis then the normal OpenCV chessboard?

Why is the Charuco Board Calibration so much better against a flipping Z-Axis then the normal OpenCV chessboard? Hi Toge

2017-12-11 10:10:40 -0500 commented answer Charuco Camera Calibration from video - console always close immediatly, why?

Ok, now it works. With the console it always told me: "Not enough captures for calibration" and does not open the video

2017-12-11 06:05:09 -0500 commented answer Charuco Camera Calibration from video - console always close immediatly, why?

Ok, now it works. With the console it always told me: "Not enough captures for calibration" and does not open the video

2017-12-06 09:17:15 -0500 asked a question Charuco Camera Calibration from video - console always close immediatly, why?

Charuco Camera Calibration from video - console always close immediatly, why? Hi Together, I am tryinig the last days t