Method for dynamically calibrating an image capture device

A method for dynamically calibrating an image capture device comprising:

• a) determining a distance (DCRT, DEST) to an object within a scene being imaged by said image capture device;
• b) determining a first lens actuator setting (DACINIT) as a function of:
• a stored calibrated lens actuator setting (DACNEARPLP) for a pre-determined near focus distance (DNEAR), a stored calibrated lens actuator setting (DACFARPLP) for a pre-determined far focus distance (DFAR), a focal length (f) of the image capture device and said determined distance (DCRT, DEST);
• c) determining a second lens actuator setting (DACFOCUS) providing maximum sharpness for said object in a captured image of said scene;
• and
• d) storing said determined distance (DCRT, DEST), first lens actuator setting (DACINIT) and second lens actuator setting (DACFOCUS);
• e) subsequently repeating steps a) to c) at a second determined distance separated from said first determined distance;
• f) determining a calibration correction (ERRNEARPLP, ERRFARPLP) for each of said calibrated lens actuator settings (DACNEARPLP, DACFARPLP) as a function of at least:
• respective differences between said second lens actuator setting (DACFOCUS) and said first lens actuator setting (DACINIT) for each of said first and second determined distances;
• and
• g) adjusting the stored calibrated lens actuator settings according to said determined calibration corrections.