Function opencv::calib3d::calibration_matrix_values

pub fn calibration_matrix_values(cameraMatrix: &Mat, imageSize: Size, apertureWidth: f64, apertureHeight: f64, fovx: f64, fovy: f64, focalLength: f64, principalPoint: Point2d, aspectRatio: f64) -> Result<(), String>

computes several useful camera characteristics from the camera matrix, camera frame resolution and the physical sensor size.