Patent ID: 8259219

Claim:
A detection system for an autofocus function of an image capture device, the detection system comprising a detection unit configured for capturing an image, the detection unit providing a plurality of different detection modes suitable for the image capture device to perform the autofocus function under different ambient light conditions, the detection unit being capable of acquiring a brightness value of the image; a calculation unit capable of determining an exposure time suitable for the image capture device to perform the autofocus function under current ambient light conditions, based on the brightness value; a selection unit capable of selecting a suitable detection mode from the plurality of detection modes based on the exposure time; and a switching unit capable of switching the image capture device to the suitable detection mode to suitably perform the autofocus function; wherein the determination of the exposure time is based on the formula: Av+Tv=Bv+Sv wherein Av represents an aperture value of the image capture device, Tv represents the value of the exposure time, By represents the brightness value, and Sv represents an automatic gain. control value of the image capture device; and wherein the plurality of detection modes comprises: a first detection mode using a first resolution of 3264 by 272, a first frame rate of 30 to 60 fps, and a low light sensitivity; a second detection mode using a second resolution of 1088 by 816, a second frame rate of 30 fps, and a high light sensitivity; and a third detection mode using a third resolution of 1088 by 272 a third frame rate of 60 fps, and medium light sensitivity.