All Questions
Tagged with computer-vision camera-calibration
445
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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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35
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Computer Vision, Extrinsic calibration. Determining the camera pose of a number of cameras using OpenCV, SfM(custom) and Python
I am a novice programmer and new to this platform, so I apologise upfront for any ignorance.
Forewarning: The problem I seek to overcome may not be strictly programming(python) based, but instead ...
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54
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calculating rotation matrix and translation vector
I have some camera parameters, from there I can get the intrinsic parameters matrix, but I didn't know how to calculate the extrinsic parameters without knowing the real world coordinates. I want ...
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61
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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 ...
- 150
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182
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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 ...
- 329
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35
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ZED 2 initialization - coordinate system w/o internal IMU system
I am using a ZED 2 with a Jetson for a robotic application, where the camera is mounted near the TCP and thus changes orientation. I want to get the raw depth data in some coordinate frame inside the ...
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24
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Monocular odometry Python systematic error
I'm trying to develop a program that will estimate trajectory using monocular odometry. The problem is I receive unpredictable results: for example, when I use static image, it shows false trajectory ...
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93
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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 (...
- 129
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64
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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 ...
- 129
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63
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OpenCV Stereo Calibration: Getting y-offset in rectified images despite using pixel-perfect synthetic keypoint matches
I'm trying to learn about stereo calibration using synthetic data rendered in Blender. My scene setup looks as follows:
This allows me to extract pixel-perfect keypoint correspondences. I'm ...
- 85
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98
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OpenCV Fish Eye Undistorting Issues for Object Detection
I am using a fish eye lens for object detection to maximize field of view (FOV). I have code to undistort the image but the reprojection error (2.9) is not great and the edges are really messed up. I ...
- 11
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48
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Extrinsic camera matrix if translation performs before rotation
An extrinsic camera matrix (E) is formed by a Rotation (R) matrix (3x3) and a Translation (t) vector (3x1).
E = [R|t]
If I have a 3D point A = [x, y, z]', the transformation from 3D to camera ...
- 75
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1
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117
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Is it possible to move the plane defined by a homography estimation by some depth z
I am measuring object width with a monocular camera. I have done the necessary calibration to remove lens distortions and to get the intrinsic parameters.
Now i used a calibration plane to define the ...
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139
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Inconsistent Intrinsic Parameters in Stereo Camera Calibration Using ChAruco Board
I am calibrating a stereo system using a ChAruco board, chosen due to the short focus distances of the cameras in my setup, which prevent me from capturing an entire classic chessboard grid on both ...
- 164
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53
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How to Correct Epipolar Lines in Stereo Vision Matching in python?
I'm encountering difficulties with the accuracy of my epipolar lines in stereo vision. Despite meticulous calibration and implementation of established algorithms, the generated epipolar lines seem to ...
