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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。
In order to suppress the speckle noise caused by laser illumination in high-speed photography, the statistical properties of speckle are analyzed. On the basis of this, the principle of non-coherent noise reduction is analyzed. The speckle When the average light intensity is not equal, the contrast of the speckle is changed. The contrast of the speckle superimposed with the different distribution of the average intensity of the speckle in the superposition is simulated. The results show that the greater the difference between the average intensities of the speckles participating in the superposition, the greater the speckle contrast and the worse the noise suppression effect. The experimental results verify the theoretical results.