# Calibrate fisheye camera of fov 195?

**URL:** <https://forum.opencv.org/t/calibrate-fisheye-camera-of-fov-195/19347>\
**Category:** C++\
**Tags:** super\_fisheye\
**Created:** [November 21, 2024, 5:00pm UTC](https://forum.opencv.org/t/calibrate-fisheye-camera-of-fov-195/19347 "2024-11-21T17:00:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pkj0382](https://avatars.discourse-cdn.com/v4/letter/p/57b2e6/32.png) [@pkj0382](https://forum.opencv.org/u/pkj0382)\
**Post date:** [November 21, 2024, 5:00pm UTC](https://forum.opencv.org/t/calibrate-fisheye-camera-of-fov-195/19347/1 "2024-11-21T17:00:51Z")

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Hello,

I am trying to calibrate fisheye camera with a field of view (FOV) of 195°. I came across a [previous post](https://forum.opencv.org/t/opencv-fisheye-calibration-fov-220/5276),which mentions that OpenCV might not be suitable for calibrating cameras with FOV \> 180°. Since that post is three years old, I wanted to check if the situation has changed and whether the OpenCV fisheye module in version 4.5 (or later) can now handle such cases effectively. When I try this module, I notice significant reprojection errors, particularly for points located farther from the center of the image.

As an alternative, I tried calibrating my fisheye camera using MATLAB, which yielded lower reprojection errors. However, I am unsure how to properly integrate the calibration results from MATLAB into OpenCV for further operations.

Additionally, has anyone used [puzzlepaint\_camera\_calibration](https://github.com/puzzlepaint/camera_calibration) for fisheye camera calibration? If so, how does it compare in terms of accuracy and usability?

Any insights would be greatly appreciated