Camera calibration is the analytical procedure of determining the camera's internal parameters including the principal distance, format size, principal point, and lens distortion coefficients.
In this case, the variations of the principal point and distortion parameters did not affect the root-mean-square error (RMSE) of the camera calibration residuals.
with (c u,c y) as the stereo camera calibration parameters, which refer to the pixel coordinates of the principal point, and (f u,f v ) as the focal lengths in pixels along the x- and y-axis, respectively.
However, there are several unknown factors that can affect the accuracy of the results, including camera principal point and principal distance, camera lens distortion coefficients, and imaging settings (i.e., shooting distance, baseline, percentage of photo overlaps, number of overlapping photos, camera intersection angles, and angles of incidence).
where [ X,Y,Z] is a 3D vertex point of cyber-information, [ R|T] is the estimated rotation matrix and translation vector, [ f x,f y ] is the focal lengths expressed in pixel units, [ c x,c y ] is a principal point, and [ x,y] is the resulting projected point in pixels.
The internal camera parameters (focal length, principal point and lens distortion) and the external camera parameters (baseline and relative orientation between cameras, lever-arms and bore-sight angles with respect to the inertial measurement unit (IMU)) are required to relate the image coordinates with the object coordinates in the scene.
(b) If the conjugate distances measured from the respective principal points are p and p′ and if m is the image magnification, then m = p′/p and 1/p′ = 1/p + 1/f′.
Two of the investigators extracted the themes and principal points of the text segments related to each code.
The point where this locus crosses the axis is called the principal point, P2, and the central portion of the locus in the neighbourhood of the axis, which is virtually a plane perpendicular to the axis, is called the principal plane.
