When aerial camera is used for particular scene (such as lighter or darker background

or there is a strong interference point)

the traditional dimming algorithm will not be able to achieve the correct exposure.For this phenomenon

a method based on scene distinguish is proposed. First the target area is extracted according to the scene classification

then the information of the target area is returned in order to control the exposure time of the camera. According to this method

the quality of the image is improved. For example

the gray value of the target area decreased from 254.65 to 124.39 in a darker background

and the information entropy is increased by 6.839; the gray value of the target area increased from 92.098 to 106.99 in a lighter background

and the information entropy is increased by 0.188.