Low-light autofocus technique

A non-transitory, computer-readable medium having instructions stored therein, wherein the instructions, when executed by a processor, perform a method comprising:

• receiving an indication of a low-light condition for a camera system;
• determining an extended exposure time for a low-light autofocus procedure of the camera system based on a motion-blur tolerance and the low-light condition;
• causing the camera system to capture an extended frame for the low-light autofocus procedure, wherein the extended frame is captured by the camera system using the determined extended exposure time;
• and
• determining, based on the captured extended frame, an in-focus lens setting for a lens of the camera system.

A mobile device comprising:

• a camera system comprising:
• an image sensor;
• and
• a lens configured to modify light from an environment surrounding the mobile device prior to the light being detected by the image sensor;
• and
• a controller, wherein the controller is configured to:
• receive an indication of a low-light condition for the camera system;
• determine an extended exposure time for a low-light autofocus procedure of the camera system based on a motion-blur tolerance and the low-light condition;
• cause the camera system to capture an extended frame for the low-light autofocus procedure, wherein the extended frame is captured by the camera system using the determined extended exposure time;
• and
• determine, based on the captured extended frame, an in-focus lens setting for the lens.