作　　者： (张荆沙）; (张琰）;

机构地区： 武昌工学院信息工程学院,武汉430065

出　　处： 《激光杂志》 2017年第8期102-105,共4页

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。 Laser active imaging has higher contrast and resolution,and clear image,but when the laser imaging is susceptible to the effects of speckle noise,there is a decline in image resolution. To suppress speckle noise interference and highlight the details of the laser image features,put forward a kind of laser active imaging based on optical scanning mirror speckle suppression system design. Analyze the causes of speckle noise,and based on the related theory of speckle suppression. The system hardware was designed which consist of laser light,laser beam expander,reflective lens,and the main module such as digital reflector. In terms of speckle suppression algorithm and based on the mean filtering decomposition multiplicative speckle noise,using adaptive threshold algorithm to design a threshold function model and threshold processing for filter coefficient; Finally do the laser image inverse change and reconstruct the wavelet coefficients to suppress speckle interference. Simulation results show that the proposed system design has strong applicability,effectively suppress speckle noise and keep maximum image edge character.

关 键 词： 激光 主动成像 散斑抑制 系统 同态均值滤波