Computes useful camera characteristics from the camera matrix

S = cv.calibrationMatrixValues(cameraMatrix, imageSize, apertureWidth, apertureHeight)

Input

• cameraMatrix Input 3x3 camera matrix that can be estimated by cv.calibrateCamera or cv.stereoCalibrate.
• imageSize Input image size [w,h] in pixels.
• apertureWidth Physical width in mm of the sensor.
• apertureHeight Physical height in mm 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 [cx,cy] in mm.
  • aspectRatio Pixel aspect ratio fy/fx.

The function computes various useful camera characteristics from the previously estimated camera matrix.

Note

Do keep in mind that the unity measure 'mm' stands for whatever unit of measure one chooses for the chessboard pitch (it can thus be any value).