# \#distortion **URL:** https://forum.opencv.org/tag/distortion/77.md [Latest](https://forum.opencv.org/latest.md) · [Categories](https://forum.opencv.org/categories.md) · [Tags](https://forum.opencv.org/tags.md) --- ## [initUndistortRectifyMap does not return same undistorted image as manual undistortion](https://forum.opencv.org/t/initundistortrectifymap-does-not-return-same-undistorted-image-as-manual-undistortion/21117)
**Author:** [@zeellos](https://forum.opencv.org/u/zeellos)\ **Replies:** 3\ **Last updated:** [May 31, 2025, 6:10am UTC](https://forum.opencv.org/t/initundistortrectifymap-does-not-return-same-undistorted-image-as-manual-undistortion/21117 "2025-05-31T06:10:04Z")
I have been trying to replicate what initUndistortRectifyMap does for my application. For some reason, when I do manual undistortion, I get different result than using initUndistortRectifyMap. I feel I am following the … --- ## [Camera calibration with point projected at infinity](https://forum.opencv.org/t/camera-calibration-with-point-projected-at-infinity/18030)
**Author:** [@Casimir\_FAYT](https://forum.opencv.org/u/Casimir_FAYT)\ **Replies:** 10\ **Last updated:** [June 21, 2024, 9:15pm UTC](https://forum.opencv.org/t/camera-calibration-with-point-projected-at-infinity/18030 "2024-06-21T21:15:19Z")
Hello, I am trying to use the OpenCV functions to calibrate a camera (extrinsic, intrinsic parameters, distortion coefficients, focal lengths, camera center, etc). However I am not using several images of a checkerboar… --- ## [Fisheye undistortImage and undistortPoints appear inconsistent?](https://forum.opencv.org/t/fisheye-undistortimage-and-undistortpoints-appear-inconsistent/10376)
**Author:** [@Gman](https://forum.opencv.org/u/Gman)\ **Replies:** 6\ **Last updated:** [October 14, 2023, 12:27pm UTC](https://forum.opencv.org/t/fisheye-undistortimage-and-undistortpoints-appear-inconsistent/10376 "2023-10-14T12:27:08Z")
I have an image with fisheye distortion and the corresponding matrices. When I undistort the image and some known points they shift relative to the image. The only related questions that I can find are from people who do… --- ## [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… --- ## [How to add Fisheye Camera Model Distortion to a undistorted image?](https://forum.opencv.org/t/how-to-add-fisheye-camera-model-distortion-to-a-undistorted-image/5743)
**Author:** [@steven414](https://forum.opencv.org/u/steven414)\ **Replies:** 0\ **Last updated:** [October 21, 2021, 6:29am UTC](https://forum.opencv.org/t/how-to-add-fisheye-camera-model-distortion-to-a-undistorted-image/5743 "2021-10-21T06:29:50Z")
Hi, I want to simulate fisheye camera sensor effect by manually add distortion to undistorted video stream image. I found in cv::fisheye library, there exists some function. By I am confused about how to apply them to V… --- ## [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…