All Questions
Tagged with opencv camera-calibration
963
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Ceres-Solver-does the initial reference 3D point matter? Experiencing significantly high reprojection error
So I have a set of 2d-3d correspondence points where the 2d coordinate points are detected by a corner detection algorithm (not written by me, and verified to be correct) and 3d coordinate points ...
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49
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Using fisheye calibration to solve allsky images using OpenCV (fails)
I am using fisheye calibration to solve chessboard images using OpenCV. It fails for the calibration flag cv2.fisheye.CALIB_RECOMPUTE_EXTRINSIC, so I work around it. But once I get the parameters, the ...
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Questions about focal_length, rvec, and tvec from camera calibration
I used images of the checkerboard to proceed with the camera calibration.
I am using PoE camera to estimate the distance from an object (actual size is known) to the camera by using focal length.
Here ...
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Hand To Eye Calibration
I want to do Hand-To-Eye calibration to get the pose of external fixed camera compared to the base of the robot using calibrateRobotWorldHandEye
However most of the code examples (including OpenCV ...
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60
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Acquire 2D real world coordinates after calibrating the camera
I have a camera that is mounted topview of an object from 20cm distance, the distance is fixed and the camera does not move nor has any rotations or transformations. The object that it overlooks is ...
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181
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Panoramic camera calibration without chessboard method
I have an image of a panoramic video camera (dual lens) in which there is a visible distortion. As the camera it's in a fixed position, and without any zoom or any other movement, and I have a lot of ...
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110
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Operate both cameras of stereo camera seperately using OpenCV
I have a stereocam, and I want both cameras to work separately, so that I can perform camera calibration and other techniques to implement stereo vision. Code of displaying it is basic OpenCV ,if ...
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Why should I use CameraDevice in JavaCV?
I am developing a desktop app that works as a webcam for a project for an universitary exam. This cam should perform several tasks into the app.
I can't understand the purpose of JavaCV's class ...
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68
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distorted narrow lens image can't be undistorted with opencv?
Overview:
The image was obtained using a ids camera on a wide field lens, roughly 15-25 images are loaded in, the output from the normal openCV functions were just giving me an identical image. Thus, ...
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46
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In c++ cv::calibrateCamera doesn´t converge to the right solution but in python yes
I’m working on calibrating a camera with C++, but it’s not working. The resulting matrix K has no relation to the camera’s actual values, and with an RMSE (root mean square error) of approximately 200....
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89
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Opencv cornerSubPix not able to find a good corner
I am trying to find a corner for this image. The corner seems clear enough for me but for some reason the algorithm doesn't seem to get it right.
I have been playing with the knobs available (...
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109
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Can iphone cameras be calibrated using OpenCV?
I plan to calibrate an iPhone camera using OpenCV, the normal way using a checkerboard pattern. However, I am not sure if the pinhole camera model applies to iPhone cameras too!?
I believe iPhone ...
- 353
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58
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Eye-in-hand calibration with IRB140 axes are wrong
I try to make a Eye-in-hand calibration with an IRB140 robot arm.
It's worked in simulation but now with the real robot its slightly off.
I got the base to gripper from Robotstudio's rapid code, like ...
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63
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Fail to detect Aruco markers at the edges
I have this image where the marker with Id 67 is not properly detected (the corners are visibly underestimated). I can see there's room to find the corner but not sure why the Aruco detector does not ...
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46
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vector of distortion coefficients returned by calibrate camera function opencv
What flags should i use in the cv.calibrate function to return all the distortion coefficients
(k1,k2,p1,p2[,k3[,k4,k5,k6[,s1,s2,s3,s4[,τx,τy]]]])
retR, cameraMatrixR, distR, rvecsR, tvecsR = cv....
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