%CALIBRATIONMATRIXVALUES  Computes useful camera characteristics from the camera matrix
%
%    S = cv.calibrationMatrixValues(cameraMatrix, imageSize, apertureWidth, apertureHeight)
%
% ## Input
% * __cameraMatrix__ Input camera matrix that can be estimated by
%        cv.calibrateCamera or cv.stereoCalibrate.
% * __imageSize__ Input image size [w,h] in pixels.
% * __apertureWidth__ Physical width of the sensor.
% * __apertureHeight__ Physical height of the sensor.
%
% ## Output
% * __S__ Struct with the following fields
% * __fovx__ Output field of view in degrees along the horizontal sensor axis.
% * __fovy__ Output field of view in degrees along the vertical sensor axis.
% * __focalLength__ Focal length of the lens in mm.
% * __principalPoint__ Principal point in pixels.
% * __aspectRatio__ fy/fx.
%
% The function computes various useful camera characteristics from the
% previously estimated camera matrix.
%
% See also cv.calibrateCamera cv.stereoCalibrate
%