But SAR image is liable to be affected by speckle noise, while almost spectral image have shortcomings of low contrast between object and background, edge blurring.
但SAR图像容易受到相干斑噪声的影响，而光谱图像普遍存在目标与背景对比度差、边缘模糊的缺点。
Based on the theory of laser speckle, a new method to measure the angular vibration of object by the laser speckle is suggested in this thesis.
本文在现有的散斑理论基础上，提出了一种利用激光散斑实时测量目标散射面角振动的新方法。
Speckle images are produced by the reflected and scattered light beams from rough surface through free-space to observing plane when laser illuminates the object surface.
激光经过被测表面反射和散射后，通过自由空间传播至观察面上形成散斑图像，其统计分布依赖于被测表面的微观形貌。
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