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Machine vision system is one of the most important components of intelligent vehicles, and the software and hardware co-realization is critical for the vision navigation of intelligent vehicles. This work presents the multi-DSP realization for intelligent vehicle vision system, analyzes and illustrates the software and hardware co-realization. Based on the software framework and the data flow of the machine vision system, we propose the software implementation for the host computer and DSP terminals. In particular, a road detection algorithm and its multi-DSP realization are presented. Simulated in real environments, the system is stable and its real-time performance is satisfactory.