Patent ID: 7847858

Claim:
A system for controlling photoflash, comprising: a photoflash module for illuminating an object, the photoflash module including a lamp, a capacitor, and a triggering unit connected in series in that order, a signal processing unit configured for analyzing image information of the object to obtain a current brightness value of the image at a first timing at which the capacitor has a first voltage value applied thereto; an A-D converter electrically connected in parallel to the lamp; a storing unit including a first memory and a second memory; a calculating unit configured for calculating a first photoflash time of the photoflash module based on the first voltage value of the capacitor and the current brightness value; and an adjusting unit configured for adjusting the first photoflash time to a second photoflash time according to a second voltage value of the capacitor at a subsequent second timing at which the first voltage value of the capacitor is changed into the second voltage value thereof and controlling flashing of the photoflash module according to the second photoflash time; wherein the A-D converter is configured for sampling the first voltage value and the second voltage value of the capacitor, the first memory is configured for holding the first voltage value until passing the first voltage value to the second memory for use in calculating the first photoflash time, the first memory is utilized as a ROM for holding the second voltage value of the capacitor received from the A-D converter, the second memory is utilized as a RAM only for storing the first voltage value of the capacitor received from the first memory, and the triggering unit is configured for receiving the second photoflash time of the adjusting unit and triggering the capacitor to discharge to control the lamp to emit light.