In this paper, we introduce an FPGA-accelerated partial image retrieval engine, suitable for a visualized document search system. To achieve efficient sharing and reuse of digitized documents, this system has the function of partial duplicate image retrieval. To meet the demand for stability and speed, we introduced a brute-force matching of the BRIEF descriptor with two step scheme and an FPGA accelerator with a thoroughly parallelized and pipelined architecture to educe the potential of the FPGA. The FPGA accelerator significantly improves the runtime performance of the engine. It is about 65 times better than a CPU-based solution on average. Ultimately, we developed a prototype document search system, and the proposed engine contributes to the intuitive retrieval and quick response of the system.
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