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Hi, Intrinsic parameter are only related to focal and optic center. Focal changes correspond to "zoom" changes, while optic center correspond to lens alignment. So during focus, lens will move, which will probably modify the optic center... But you can, most of the time, neglect the changes as they will be very small! Along to intrinsic parameters, you will also have to estimate lens distortion, which will also be slightly modified when focus change. But as before, usually you can neglect the changes!

You can find a good introduction in opencv doc : http://docs.opencv.org/master/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html

Hi, Intrinsic parameter are only related to focal and optic center. Focal changes correspond to "zoom" changes, while optic center correspond to lens alignment. So during focus, lens will move, which will probably modify the optic center... But you can, most of the time, neglect the changes as they will be very small! Along to intrinsic parameters, you will also have to estimate lens distortion, which will also be slightly modified when focus change. But as before, usually you can neglect the changes!(very) small!

You can find a good introduction in opencv doc : http://docs.opencv.org/master/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html

Hi, Intrinsic parameter are only related to focal and optic center. lens. Focal changes correspond to "zoom" changes, changes (so it is not modified during auto-focus), while optic center correspond to lens alignment. So And during focus, lens will move, which but if the lens are perfect, they will probably modify not change the optic center... But center. On chip camera, a small change can occur, but you can, most of the time, neglect the changes as they will be very (very) small!

You can find a good introduction in opencv doc : http://docs.opencv.org/master/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html