The goal of this article is to compare some optimized implementations on current High Performance Platforms in order to highlight architectural trends in the field of embedded architectures and to get an estimation of what should be the components of a next generation vision system. We present some implementations of robust motion detection algorithms on three architectures: a general purpose RISC processor-the PowerPC G4-a parallel artificial retina dedicated to low level image processing-Pvlsar34-and the Associative Mesh, a specialized architecture based on asso-ciative net. To handle the different aspects and constraints of embedded systems, execution time and power consumption of these architectures are compared.