A system is provided in the present disclosure. The system may determine a first exposure time of a visible light sensor of an image acquisition device according to ambient light at a scene to be photographed. The image acquisition device may include the visible light sensor and an infrared light sensor. The system may also actuate the image acquisition device to simultaneously capture a visible light image and at least one infrared light image of the scene. The visible light image may be captured using a visible light sensor with the first exposure time. The at least one infrared light image may be captured using an infrared light sensor. The system may also generate a WDR image by processing the at least one infrared light image, and generate a target image of the scene by fusing the visible light image and the WDR image.