Brightness-adjusting system and method thereof and electronic device using same

An electronic device with a brightness-adjusting function comprising:

• a plurality of light-emitting units configured to provide illumination for the lens module to capture image;
• a lens module configured to capture a first image of an object in response a user operation;
• wherein the first image is composed of a plurality of sub-images, each of which is associated with one of the light-emitting units;
• a plurality of driving controllers, wherein each of the driving controllers is electrically connected to one of the light-emitting units, and is configured to adjust current flowing to the light-emitting unit to adjust an illumination value of the light-emitting unit;
• and
• a processing unit configured to divide the first image into a plurality of sub-images, detect whether or not the average brightness value of the each sub-image falls within a predetermined brightness value range, determine the driving controller associated with the light-emitting unit associated with the sub-image that has the average brightness value that does not fall within the predetermined brightness value range, control the determined driving controller to adjust current flowing to the light-emitting unit to adjust the illumination value of the light-emitting unit, and control the lens module to capture a second image of the object after the driving controller has adjusted the current flowing to the light-emitting unit.

A brightness-adjusting method being run in an electronic device, wherein the electronic device comprises a lens module, a plurality of light-emitting units, and a plurality of driving controllers, the lens module is configured to capture a first image of an object in response a user operation, the plurality of light-emitting units are configured to provide illumination for the lens module to capture image, each of the driving controllers is electrically connected to one of the light-emitting units, and is configured to adjust current flowing to the light-emitting unit to adjust an illumination value of the light-emitting unit, the first image is composed of a plurality of sub-images, each of which is associated with one of the light-emitting units, the method comprising:

• dividing the first image into a plurality of sub-images;
• acquiring an average brightness value of each sub-image;
• detecting whether or not the average brightness value of the each sub-image falls with a predetermined brightness value range;
• determining the driving controller associated with the light-emitting unit associated with the sub-image that has the average brightness value that does not fall within the predetermined brightness value range;
• controlling the determined driving controller to adjust current flowing to the light-emitting unit to adjust the illumination value of the light-emitting unit;
• and
• controlling the lens module to capture a second image of the object after the driving controller has adjusted the current flowing to the light-emitting unit.