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In this paper, a Naive Bayes classifier was simplified and implemented as a multi-class classifier for binary feature vectors. It was designed on FPGA using very limited hardware resources and runs quickly and efficiently in both training and testing phases. It was first tested on a handwriting digital number dataset, and then applied in the visual object recognition on a single FPGA based visual surveillance system. It was compared with a binary Self Organizing Map (bSOM) using tri-states operation on FPGA, and the experimental results demonstrated both its higher performance and lower resource usage on the FPGA chip.