This paper proposes a system for eliminating the influence of fog on optical imaging of vehicle recording equipment, the visual effect of the image acquisition by the vehicle-mounted equipment is improved, and the subsequent extraction and application of information in the image can be optimized. The designed dual-mode mist dissipating system includes two parts: hardware and software, the hardware is a mechanical defogging structure based on the physical heat dissipation effect and the software is an image processing algorithm based on the atmospheric scattering model estimation. It can better ensure the clarity and details of the vehicle recorded image under different humidity conditions, and has the advantages of real-time processing and adaptive feedback, which make it suitable for commercial applications.