The invention discloses an image brightness
exposure compensation device and a compensation method thereof. The image brightness
exposure compensation device comprises a camera used for monitoring a shooting scene in real time, a
liquid crystal screen used for
exposure compensation and a driving board used for controlling the
liquid crystal screen. Wherein the camera comprises a lens and a CCD (
Charge Coupled Device)
chip, the
liquid crystal screen is arranged between the lens and the CCD
chip in parallel at an interval to form a hamburger structure, and the liquid
crystal screen is in communication connection with the driving board; the
system further comprises an upper computer used for compensation calculation, the upper computer is in communication connection with the camera and the drive board through a
USB interface, firstly, the liquid
crystal screen is set to be full-light-transmitting, and the camera monitors a scene needing to be shot in real time and collects illumination information in the scene. Secondly, the liquid
crystal screen obtains
exposure compensation after background
processing, at the moment, the camera is arranged on the rear side of the liquid crystal compensation plate, and therefore a clear scene with the
high contrast influence eliminated is obtained. Through the
processing scheme disclosed by the invention, the light incoming amount at a strong light position is reduced, the brightness of the obtained image is proper, and
exposure compensation is realized.