In order to meet the requirement of image quality in machine vision field,a nonlinear bilateral filter system based on FPGA is designed,and the noise image is denoised through the bilateral filter system.This paper theoretically analyzes the bilateral filter system from three aspects:the principle of bilateral filter,the reason of "edge preservation" of bilateral filtering,and the influence of bilateral filter parameter values.The bilateral filter system is realized on FPGA through look-up tables,parallel pipeline processing,etc.The portability of bilateral filter system is improved through modular design and parametric programming.The designed bilateral filter system is tested and verified.The PSNR value of the image after noise reduction by the bilateral filter system is 3.284 2 dB higher than that of the noisy image,and the SSIM is 21.82% higher.The designed bilateral filter system has achieved certain noise suppression effect.
Key words
FPGA /
image noise /
bilateral filter /
image preprocessing /
machine vision
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 康宇.基于CMOS传感器的图像采集处理系统设计与实现[D].太原:中北大学,2021.
[2] 黄继业,陆燕怡.基于FPGA的双边滤波算法[J].实验室研究与探索,2019,38(8):48-51.
[3] 张爱杰,刘士建,张瑞,等.基于FPGA的双边滤波器设计[J].红外技术,2019,41(1):13-17.
[4] 唐文豪.基于FPGA低照度视频采集与边缘检测算法研究[D].西安:西安科技大学,2021.
[5] 周林鑫.显微相机视频流ISP技术的FPGA实现[D].杭州:浙江大学,2021.
[6] 宫珊.基于FPGA的实时图像采集处理显示系统[D].成都:电子科技大学,2017.
[7] 严飞,陈佳宇,张华西,等.基于FPGA的图像双边滤波器系统设计[J].仪表技术与传感器,2022(6):99-104.
[8] 张春雷,徐润,王郁杰,等.基于FPGA的视频实时去雾算法及其硬件实现[J].半导体光电,2021,42(2):264-268,274.
[9] 魏然然.红外成像系统中图像增强算法研究[D].长春:长春理工大学,2021.
PDF(3686 KB)
