Abstract: In image acquisition,it is inevitable to introduce noise,which has certain influence on video image quality.In order to avoid noise sent into the codec system,preprocessing of collected video image is performed using median filtering technology with FPGA as the core processor component and modelsim simulation tool for verification.Results show that the preprocessing reduces video image noise with satisfying filtering effect and avoids noise transmission level by level,thus ensuring the display effect of video image.

Key words: image acquisition;FPGA;median filtering;image preprocessing