Flash assembly of mobile terminal, control system thereof and control method thereof

A control method of a flash assembly, comprising:

• a scene predictor prejudging an ambient light color temperature and an ambient light brightness of a current scene to obtain data of the ambient light color temperature and the ambient light brightness, calculating a focus point, a target value for color temperature adjustment and a target value for brightness adjustment using 3A algorithm, and transmitting the focus point, the target value for color temperature adjustment and the target value for brightness adjustment to a controller;
• the controller calculating correspondingly a shutter speed, a sensitivity of a sensor of the camera assembly, and a current ratio outputted by the flash assembly according to the target value for color temperature adjustment and the target value for brightness adjustment;
• and
• the flash assembly outputting correspondingly a display color temperature and a display brightness,
• wherein the 3A algorithm comprises an automatic focus algorithm, an automatic exposure algorithm and an automatic white balance algorithm,
• wherein the automatic exposure algorithm comprises:
• obtaining a pre-flash image by pre-flashing the flash assembly after obtaining an original image of the current scene through the camera assembly;
• analyzing the original image to obtain a brightness value of the original image, and comparing the brightness value of the original image with a target brightness value to obtain an exposure setting value of the original image;
• analyzing the pre-flash image to obtain a brightness value of the pre-flash image, and comparing the brightness value of the pre-flash image with the target brightness value to obtain an exposure setting value of the pre-flash image;
• and
• averaging the exposure setting value of the original image and the exposure setting value of the pre-flash image to finally obtain the target value for brightness adjustment;
• wherein the scene predictor decreasing the brightness value of the original image or the pre-flash image by the exposure setting value thereof when the brightness value of the original image or the pre-flash image is greater than the target brightness value to define an overexposure;
• and the scene predictor increasing the brightness value of the original image or the pre-flash image by the exposure setting value thereof when the brightness value of the original image or the pre-flash image is smaller than the target brightness value to define an underexposure.