This resulted in excessive pincushion distortion near the corners. In our first attempt to fix distortion we adjusted the single slider in the Adobe's old Lens Correction filter to correct barrel distortion. This type of complex distortion is often called moustache distortion as it resembles a handlebar moustache such as the one found on Sir Arthur Conan Doyle.

The distortion at full wide angle, or 24mm, consists of barrel distortion near the center and pincushion distortion at the corners. Starting with CS5 the Lens Correction filter can automatically correct distortion based on several pre-calibrated parameters.Ĭomplex distortion can be a challenge to correct. Wide-angle lenses typically require more than one parameter for accurate correction. Pixel_locations_dst.One parameter often does a fine job on standard and telephoto lenses. This is a complementary function to undistort, may be faster or better ways to do it but it works: void distort(const cv::Mat& src, cv::Mat& dst, const cv::Mat& cameraMatrix, const cv::Mat& distCoeffs)Ĭv::Mat distort_x = cv::Mat(src.size(), CV_32F) Ĭv::Mat distort_y = cv::Mat(src.size(), CV_32F) Ĭv::Mat pixel_locations_src = cv::Mat(src.size(), CV_32FC2) įor (int i = 0 i (i,j) = cv::Point2f(j,i) Ĭv::Mat fractional_locations_dst = cv::Mat(src.size(), CV_32FC2) Ĭv::undistortPoints(pixel_locations_src, pixel_locations_dst, cameraMatrix, distCoeffs) Ĭv::Mat pixel_locations_dst = cv::Mat(src.size(), CV_32FC2) Ĭonst float y = fractional_locations_dst.at(i,j).y*fy + cy here the undistortion will be computedĬv::initUndistortRectifyMap(cam1, distCoeff, cv::Mat(), cam2, input.size(), CV_32FC1, map1, map2) Ĭv::remap(input, distCorrected, map1, map2, cv::INTER_LINEAR) cam2.at(0,2) = 100 // for testing a translation

assume unit matrix for camera, so no movement If that's not the case there might be a bug in this code (I don't know whether double or single precision is assumed): cv::Mat distCoeff ĭistCoeff = cv::Mat::zeros(8,1,CV_64FC1) Since I dont know to which coefficients your barrel distortion parameters correspond (maybe have a look at and you will have to try it out or maybe someone else can help here.Īnother point is that I'm not sure whether openCV will handle both, float and double automatically. Here is a method that will undistort an image if you have no chessboard pattern but you know the distortion coefficients.

Ptlens distortion model