Patent ID: 8953095
Filing Date: 2015-02-10
Classification: G02F,G03B,H04N

Abstract:
1. A flash light device, comprising: a light source; a light source's driving unit, coupled to the light source and receiving a trigger signal to drive the light source for emitting light energy; a light diffuser, disposed in front of the light source and comprising a plurality of first sub-blocks, wherein each of the first sub-blocks is respectively controlled by a corresponding driving voltage so as to adjust light penetration energy of each of the first sub-blocks; and a light diffuser's driving unit, coupled to the light diffuser, receiving a set of voltage information and producing and providing the driving voltage corresponding to each of the first sub-blocks according to the set of voltage information, the driving voltage corresponding to each of the first sub-blocks in the light diffuser is determined by a primary control chip of digital capturing system through performing following steps: (a) capturing an original image without light-complementing of the light source; (b) capturing a first pre-flash image with light-complementing by using a presetting first light source energy; (c) deriving reflection energy ratio of each pixel by using the original image and the first pre-flash image; (d) determining a second light source energy according to the result of step (c); (e) deriving exposure value of each pixel of an image after light-complementing with the second light source energy according to the results of steps (c) and (d), wherein the image after light-complementing with the second light source energy comprises a plurality of second sub-blocks corresponding to the plurality of the first sub-blocks of the light diffuser; and (f) determining the driving voltage of each of the first sub-blocks according to the result of step (e); wherein the set of voltage information is for indicating the required driving voltage corresponding to each of the first sub-blocks in the light diffuser, wherein the driving voltage is determined according to the original image without light-complementing of the light source and the first pre-flash image with light-complementing of the light source.