光学学报, 2016, 36 (1): 0129002, 网络出版: 2015-12-31
激光光束非相干叠加对散斑噪声抑制情况
Suppression Situation of Incoherent Superposition of Laser Beams on Speckle Noise
散射 高速摄影 激光散斑 非相干叠加 散斑对比度 scattering high-speed photography laser speckle Incoherent superposition speckle contrast
摘要
为了抑制高速摄影中激光照明产生的散斑噪声对图像信息的干扰,分析了散斑的统计特性,并在此基础上对光束非相干叠加降噪原理进行了分析,讨论了参与叠加的散斑平均光强不等时叠加后散斑对比度的变化情况,对参与叠加的散斑平均光强满足不同分布时叠加后散斑对比度随叠加个数的变化情况进行了模拟。结果表明,参与叠加的散斑平均光强差异越大叠加后的散斑对比度越大,噪声抑制效果越差。并通过实验对理论结果进行了验证。
Abstract
To suppress the distortion of speckle noise produced by laser illumination on image information in highspeed photography, the statistic characteristics of speckle noise are analyzed. Based on the statistic characteristics, incoherent superposition principle of laser beams to reduce noise is analyzed, specially when the average intensity of speckles is not identical and meets with different distributions. The contrast of speckle over the number of superposition speckles is discussed. The influence of the number of superposition speckles in different distributions of the average intensity of speckles on the contrast of speckle is simulated. The results indicate that, the contrast of speckle increases with the increase of the difference of the average intensity of speckle in superposition, leading to a worse suppression effect. And the theoretical results agree with the experimental results.
邓慧, 张蓉竹, 孙年春. 激光光束非相干叠加对散斑噪声抑制情况[J]. 光学学报, 2016, 36(1): 0129002. Deng Hui, Zhang Rongzhu, Sun Nianchun. Suppression Situation of Incoherent Superposition of Laser Beams on Speckle Noise[J]. Acta Optica Sinica, 2016, 36(1): 0129002.