Flash and flash illumination method

A flash illumination method, comprising:

• controlling an image capture device to capture a first image by a main controller;
• analyzing the first image to determine an LED irradiation region in an LED array of a light source module by the main controller;
• determining a plurality of first LEDs that need to be turned on in the LED array according to the LED irradiation region by the main controller;
• sending a light source control signal to the light source controller by the main controller, so that the light source controller sends a control current, turns on the first LEDs, and captures a second image;
• analyzing the second image and confirming whether the second image complies with a required standard by the main controller;
• when the second image complies with the required standard, storing the second image;
• when the second image does not comply with the required standard, sending the light source control signal to the light source controller again by the main controller, so that the light source controller sends the control current, turns on the first LEDs, and captures a third image.