红外技术
紅外技術
홍외기술
INFRARED TECHNOLOGY
2014年
12期
976-981
,共6页
何康%裘溯%金伟其%魏树弟
何康%裘溯%金偉其%魏樹弟
하강%구소%금위기%위수제
水下图像%距离选通成像%实时处理%FPGA%图像增强
水下圖像%距離選通成像%實時處理%FPGA%圖像增彊
수하도상%거리선통성상%실시처리%FPGA%도상증강
underwater image%range-gated%real-time processing%FPGA%image enhancement
水下激光距离选通成像中要对水下距离选通图像进行增强处理。水下图像通常具有噪声大、对比度差、照度不均匀的特点。通过分析水下图像的成像特点，针对引起图像降质的因素进行增强算法设计，提出了基于帧叠加去噪与双平台直方图变换相结合的视频增强算法。可实现目标信息增强的同时抑制背景，将目标和背景区别处理。算法以Xilinx公司的XC5VLX50T系列FPGA芯片为核心，使用到了软核Microblaze、片内BLOCKRAM、外部SRAM等资源设计硬件系统，并已在水下选通成像系统中得到有效应用。
水下激光距離選通成像中要對水下距離選通圖像進行增彊處理。水下圖像通常具有譟聲大、對比度差、照度不均勻的特點。通過分析水下圖像的成像特點，針對引起圖像降質的因素進行增彊算法設計，提齣瞭基于幀疊加去譟與雙平檯直方圖變換相結閤的視頻增彊算法。可實現目標信息增彊的同時抑製揹景，將目標和揹景區彆處理。算法以Xilinx公司的XC5VLX50T繫列FPGA芯片為覈心，使用到瞭軟覈Microblaze、片內BLOCKRAM、外部SRAM等資源設計硬件繫統，併已在水下選通成像繫統中得到有效應用。
수하격광거리선통성상중요대수하거리선통도상진행증강처리。수하도상통상구유조성대、대비도차、조도불균균적특점。통과분석수하도상적성상특점，침대인기도상강질적인소진행증강산법설계，제출료기우정첩가거조여쌍평태직방도변환상결합적시빈증강산법。가실현목표신식증강적동시억제배경，장목표화배경구별처리。산법이Xilinx공사적XC5VLX50T계렬FPGA심편위핵심，사용도료연핵Microblaze、편내BLOCKRAM、외부SRAM등자원설계경건계통，병이재수하선통성상계통중득도유효응용。
The images of underwater range gated system always have a few problems like uneven lighting, low contrast and noises. In order to improve the quality of those kinds of images, this paper put forward an algorithm based on image frames superimpose and double platform histogram equalization. The algorithm not only enhances the target information but also suppresses the enhancement of the background. The design of algorithm is based on the FPGA chip produced by Xilinx company, which uses hardware resources including Microblaze, BLOCKRAM, SRAM and so on. The algorithm has been proved effective in the underwater range gated system.
