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The introduction of embedded DSP blocks and embedded memory has made FPGAs an attractive architecture for implementation of real-time video processing systems. The big bottle neck of the FPGA compared to other programmable architectures is the complex programming model. This paper presents an automatic generation of placement and routing constraints for FPGA implementation of real-time video processing systems as one step to automate the programming model. The constraint generator targets lower power consumption, better resource utilization and reduced development time. Results show that a 28% reduction in dynamic power can be achieved using the proposed approach over traditional logic to memory mapping.