# \#calibratecamera **URL:** https://forum.opencv.org/tag/calibratecamera/200.md [Latest](https://forum.opencv.org/latest.md) · [Categories](https://forum.opencv.org/categories.md) · [Tags](https://forum.opencv.org/tags.md) --- ## [Rendering a CharucoBoard in my app: how to calculate squareLength and markerLength?](https://forum.opencv.org/t/rendering-a-charucoboard-in-my-app-how-to-calculate-squarelength-and-markerlength/22789)
**Author:** [@snoriman](https://forum.opencv.org/u/snoriman)\ **Replies:** 5\ **Last updated:** [June 29, 2025, 10:15pm UTC](https://forum.opencv.org/t/rendering-a-charucoboard-in-my-app-how-to-calculate-squarelength-and-markerlength/22789 "2025-06-29T22:15:16Z")
I’m working on am app where I generate a CharucoBoard, which I then display on a monitor. I plan to take photos of this board from different angles using a camera, and use those images for camera calibration. The part I… --- ## [Camera calibration for AI object detection](https://forum.opencv.org/t/camera-calibration-for-ai-object-detection/22745)
**Author:** [@snoriman](https://forum.opencv.org/u/snoriman)\ **Replies:** 2\ **Last updated:** [June 26, 2025, 1:27pm UTC](https://forum.opencv.org/t/camera-calibration-for-ai-object-detection/22745 "2025-06-26T13:27:10Z")
I’m experimenting with computer vision and AI models to detect people in a video stream and then map their positions onto a 2D map. Right now, I’m trying to find a solid way to convert the coordinates from the detected … --- ## [Eye-to-hand calibration for a 4 DOF robot arm](https://forum.opencv.org/t/eye-to-hand-calibration-for-a-4-dof-robot-arm/17139)
**Author:** [@AliBuildsAI](https://forum.opencv.org/u/AliBuildsAI)\ **Replies:** 6\ **Last updated:** [May 20, 2024, 7:29pm UTC](https://forum.opencv.org/t/eye-to-hand-calibration-for-a-4-dof-robot-arm/17139 "2024-05-20T19:29:36Z")
Hi, I have a robot with 4 DOF (end-effector has X, Y, Z, and Yaw. Roll and pitch are fixed). I also have a camera (stereoLabs Zed 2 camera). I want to do a robot camera calibration, where the camera is mounted in a st… --- ## [Inconsistent camera calibration results](https://forum.opencv.org/t/inconsistent-camera-calibration-results/17136)
**Author:** [@AliBuildsAI](https://forum.opencv.org/u/AliBuildsAI)\ **Replies:** 6\ **Last updated:** [April 8, 2024, 12:57am UTC](https://forum.opencv.org/t/inconsistent-camera-calibration-results/17136 "2024-04-08T00:57:02Z")
Hi, I am trying to calibrate a StereoLabs Zed 2 camera and I get inconsistent results. Zed cameras are calibrated themselves, and here is the calibration parameters coming from their SDK: I am trying to calibrate t… --- ## [Interactive calibration app](https://forum.opencv.org/t/interactive-calibration-app/9662)
**Author:** [@LB94](https://forum.opencv.org/u/LB94)\ **Replies:** 6\ **Last updated:** [July 28, 2022, 5:08pm UTC](https://forum.opencv.org/t/interactive-calibration-app/9662 "2022-07-28T17:08:27Z")
Hi, I’m using the opencv interactive calibration app but I’m having some issues with circles pattern target. The app can detect the circles grid of my checkerboard but all the frames are rejected. The checkerboard is … --- ## [Obtaining the Extrinsic Matrix of a Camera](https://forum.opencv.org/t/obtaining-the-extrinsic-matrix-of-a-camera/6741)
**Author:** [@lightbringer](https://forum.opencv.org/u/lightbringer)\ **Replies:** 4\ **Last updated:** [December 15, 2022, 3:06pm UTC](https://forum.opencv.org/t/obtaining-the-extrinsic-matrix-of-a-camera/6741 "2022-12-15T15:06:31Z")
Hello, I try to learn camera calibration. I used cv::calibrateCamera to obtain intrinsic camera matrix, distortion coefficients, rotation vectors, and translation vectors. How do I get the extrinsic matrix for that camer… --- ## [Calibrated camera distance between two projected points](https://forum.opencv.org/t/calibrated-camera-distance-between-two-projected-points/10241)
**Author:** [@awf93](https://forum.opencv.org/u/awf93)\ **Replies:** 2\ **Last updated:** [September 18, 2022, 2:11pm UTC](https://forum.opencv.org/t/calibrated-camera-distance-between-two-projected-points/10241 "2022-09-18T14:11:50Z")
Hey together, for a project i need the distance between two projected points (cv2.projectpoints). One point is at specific distance from a aruco marker and the second point in a specific distance to a second aruco marke… --- ## [Use "distortPoints" to apply barrel distortion to an image](https://forum.opencv.org/t/use-distortpoints-to-apply-barrel-distortion-to-an-image/9034)
**Author:** [@nb\_xyz](https://forum.opencv.org/u/nb_xyz)\ **Replies:** 1\ **Last updated:** [June 8, 2022, 1:38pm UTC](https://forum.opencv.org/t/use-distortpoints-to-apply-barrel-distortion-to-an-image/9034 "2022-06-08T13:38:54Z")
Hi, My usecase is as follows: Given a rectilinear image, apply a barrel distortion to it. I have my camera calibrated and have the K and D matrices. I use a mesh grid. Convert the coordinates to homogenous, multiply wi… --- ## [Finding original pixel values from undistorted image (re-distorting)](https://forum.opencv.org/t/finding-original-pixel-values-from-undistorted-image-re-distorting/8339)
**Author:** [@cherriesandwine](https://forum.opencv.org/u/cherriesandwine)\ **Replies:** 2\ **Last updated:** [June 3, 2022, 5:55pm UTC](https://forum.opencv.org/t/finding-original-pixel-values-from-undistorted-image-re-distorting/8339 "2022-06-03T17:55:26Z")
I am using a stereo camera set-up with a very wide angle (180 degree). I suspect that the camera calibration is not optimal, because I am not getting very accurate results when trying to find the world coordinates of a p… --- ## [How does solvePnP deal with distortion](https://forum.opencv.org/t/how-does-solvepnp-deal-with-distortion/8486)
**Author:** [@rool12](https://forum.opencv.org/u/rool12)\ **Replies:** 3\ **Last updated:** [April 28, 2022, 4:48pm UTC](https://forum.opencv.org/t/how-does-solvepnp-deal-with-distortion/8486 "2022-04-28T16:48:32Z")
Hey guys, I’ve a camera with obvious distortion. I calibrated this camera to receive the camera intrinsic matrix and the distortion parameters. When you undistort your camera you’ve two options: Undistort your image… --- ## [Is there exist a function to "undistort" list of points instead of 2d array (image)?](https://forum.opencv.org/t/is-there-exist-a-function-to-undistort-list-of-points-instead-of-2d-array-image/8022)
**Author:** [@trojek](https://forum.opencv.org/u/trojek)\ **Replies:** 2\ **Last updated:** [March 20, 2022, 4:20pm UTC](https://forum.opencv.org/t/is-there-exist-a-function-to-undistort-list-of-points-instead-of-2d-array-image/8022 "2022-03-20T16:20:47Z")
Hi! Based on documentation of camera calibration one can assume that to get an undistorted image one need to apply the following operations: Get images with chess board, then use cv.calibrateCamera() which returns the… --- ## [Obtaining the rotation of a camera](https://forum.opencv.org/t/obtaining-the-rotation-of-a-camera/7661)
**Author:** [@Hans\_HH](https://forum.opencv.org/u/Hans_HH)\ **Replies:** 1\ **Last updated:** [February 21, 2022, 1:13am UTC](https://forum.opencv.org/t/obtaining-the-rotation-of-a-camera/7661 "2022-02-21T01:13:42Z")
Dear Community, For my project I need the rotation of the camera relative to a wall. The camera views the scene with a certain rotation. Measuring this by hand is difficult. For this reason I tried to use the approach o… --- ## [Calibration of non-overlapping cameras](https://forum.opencv.org/t/calibration-of-non-overlapping-cameras/4217)
**Author:** [@mikor13](https://forum.opencv.org/u/mikor13)\ **Replies:** 1\ **Last updated:** [July 7, 2021, 6:29pm UTC](https://forum.opencv.org/t/calibration-of-non-overlapping-cameras/4217 "2021-07-07T18:29:51Z")
Hello everyone, thank you for taking time to check this post. My question is the following: I have 4 non-overlapping cameras that make a camera rig and I want to find the relative position of each camera in respect to t… --- ## [How to correct distortion from stitching dual camera to estimate homography](https://forum.opencv.org/t/how-to-correct-distortion-from-stitching-dual-camera-to-estimate-homography/1645)
**Author:** [@Adria\_Ciurana](https://forum.opencv.org/u/Adria_Ciurana)\ **Replies:** 4\ **Last updated:** [April 13, 2021, 9:45am UTC](https://forum.opencv.org/t/how-to-correct-distortion-from-stitching-dual-camera-to-estimate-homography/1645 "2021-04-13T09:45:11Z")
I am trying to distort the image obtained from two cameras that generate a stitching image. Unfortunately, I do not have access to the cameras and I would like to know what could be the best way to apply to correct the i… --- ## [What would you make of this output from drawChessboardCorners?](https://forum.opencv.org/t/what-would-you-make-of-this-output-from-drawchessboardcorners/2436)
**Author:** [@matan](https://forum.opencv.org/u/matan)\ **Replies:** 6\ **Last updated:** [March 30, 2021, 11:58am UTC](https://forum.opencv.org/t/what-would-you-make-of-this-output-from-drawchessboardcorners/2436 "2021-03-30T11:58:25Z")
Not sure why the huge circles … I do have the right number of corners detected by findChessboardCorners and am using the same dimensions for both these api calls. It’s an ipad display of the checkerboard pattern as ca… --- ## [Chessboard corner finding opencv vs matlab](https://forum.opencv.org/t/chessboard-corner-finding-opencv-vs-matlab/2130)
**Author:** [@Tzvi](https://forum.opencv.org/u/Tzvi)\ **Replies:** 0\ **Last updated:** [March 12, 2021, 3:11pm UTC](https://forum.opencv.org/t/chessboard-corner-finding-opencv-vs-matlab/2130 "2021-03-12T15:11:03Z")
Hi, I am working on image calibration. I have chalenging chessboard images (blurry with high turbulence) and the findCessboarsCorner function fails to find the corners on all of the images. When I try to do it on the Mat…