This paper proposes a system for the background image generation by cooperative parallel processingunder the severe outdoor environmental conditions, which are ever changing in nature. Software of this system is composed of four individual modules. Each module function by exchanging the information which is resulted from the processing in other modules. Each module is implemented on the hardware system of parallel processing composed of the transputers(T805) network according as its properties. The effectiveness of this system is examined on the real outdoor scene practically. As the result, the system suitably responds to such environment and the correct background images can be generated. It is confirmed that the cooperative parallel processing enables the system to be highly flexible and adaptive to various conditions.