激光主动成像散斑抑制系统设计

发布时间：2018-02-16 01:24

本文关键词： 激光主动成像散斑抑制系统同态均值滤波　出处：《激光杂志》2017年08期 　论文类型：期刊论文

【摘要】：激光主动成像具有较高分辨率、成像清晰,但激光成像时易受到散斑噪声的影响,导致图像分辨率下降。为抑制散斑噪声的干扰,突出激光图像的细节特征,提出一种基于光机电扫描镜的激光主动成像散斑抑制系统。分析散斑噪声产生的原因,并基于散斑抑制相关理论,设计了以激光光源、激光扩束镜、反射物镜、数字反射器等为主要模块的系统硬件结构;在散斑抑制算法方面,基于同态均值滤波分解乘性散斑噪声,采用自适应阈值算法设计一种阈值函数模型,对同态滤波系数进行阈值处理;最后进行激光图像的同态逆变化和小波系数重构,抑制图像的散斑干扰。仿真实验表明,提出的系统具有较强的适用性,在有效抑制散斑噪声干扰的同时,可以最大限度的保留图像的边缘特征。
[Abstract]:Laser active imaging has high resolution and clear imaging, but it is easy to be affected by speckle noise in laser imaging, which leads to the decrease of image resolution. In order to suppress the interference of speckle noise and highlight the detail characteristics of laser image, laser active imaging is easy to be affected by speckle noise. A laser active imaging speckle suppression system based on optical electromechanical scanning mirror is proposed. The causes of speckle noise are analyzed. Based on the theory of speckle suppression, laser light source, laser beam expander mirror and reflecting objective lens are designed. In the aspect of speckle suppression algorithm, an adaptive threshold function model is designed based on homomorphic mean filter to decompose multiplicative speckle noise. At last, the homomorphism inverse change of laser image and the reconstruction of wavelet coefficient are carried out to suppress the speckle interference of the image. The simulation results show that the proposed system has strong applicability. While effectively suppressing speckle noise interference, the edge features of the image can be preserved as much as possible.
【作者单位】：武昌工学院信息工程学院;法国贡比涅技术大学(UTC);
【基金】：湖北省教育厅科学技术研究计划指导性项目(B2016353)
【分类号】：TN249

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