The present invention relates to a device for varying the fuel-air mixture flow to an engine, and more particularly, to a device for varying the fuel-air mixture flow to the engine that can change the fuel-air mixture reaching the combustion chamber, thus improving fuel combustion and reducing pollution. According to an image processing system of the present invention, a first processing unit searches a road surface image captured by a vehicle-mounted camera for a \u201csmall area,\u201d which is composed of high- or low-luminance pixels and satisfies \u201celigibility conditions\u201d on the \u201csize,\u201d \u201cshape,\u201d and \u201carrangement\u201d in the road surface image. A transmitter generates a transmission radar signal and a receiver processes the simulated return signal based on the transmission radar signal.