Actuator ring characteristic measurement method

An apparatus for determining lens actuation characteristics of an imaging device, comprising:

• a lens;
• a lens actuator;
• a processor, operably coupled to the lens actuator;
• a memory, operably coupled to the processor, and configured to store:
• an autofocus module, configured to determine a current lens position and a focus lens position, wherein the distance between the current lens position and target lens position is a target distance;
• a parameter determination module, configured to determine a scan sequence having a plurality of successive measurements, each measurement having at least a first measurement parameter and subsequent measurement parameter, each measurement parameter including at least one step and at least one time delay;
• a lens control module, configured to move the lens the target distance for each successive measurement based on the measurement parameters of each successive measurement;
• a performance measurement module, configured to measure a performance indicator of each successive measurement;
• and
• a characteristic determination module, configured to determine at least one actuation characteristic based on the first measurement parameter of the measurement having the highest performance indicator.

A non-transitory computer readable medium comprising instructions that when executed causes a processor to perform a method of auto-focusing a lens, the method comprising:

• determining a target distance to move a lens by an actuator to focus a scene on an image sensor, wherein moving the lens by the actuator causes an associated lens vibration having at least one actuation characteristic;
• determining a scan sequence having a plurality of successive measurements, each measurement having at least a first measurement parameter and subsequent measurement parameter, each measurement parameter including at least one step and at least one time delay;
• moving the lens the target distance for each successive measurement based on the measurement parameters of each successive measurement;
• measuring a performance indicator of each successive measurement;
• and
• determining at least one actuation characteristic based on the first measurement parameter of the measurement having the highest performance indicator.

An apparatus for determining lens actuation characteristics of an imaging device, comprising:

• a means for determining determine a current lens position and a focus lens position, wherein the distance between the current lens position and target lens position is a target distance;
• a means for determining a plurality of successive measurements, each measurement having at least a first measurement parameter and subsequent measurement parameter, each measurement parameter including at least one step and at least one time delay;
• a means for moving the lens the target distance for each successive measurement based on the measurement parameters of each successive measurement;
• a means for measuring a performance indicator of each successive measurement;
• a means for identifying a measurement having the highest performance indicator;
• and
• a means for determining at least one actuation characteristic based on the first measurement parameter of the measurement having the highest performance indicator.