传统的激光主动成像散斑抑制方法中, 局部单像素滤波和变换域滤波难以取得良好的抑制效果, 同时容易导致边缘展宽, 对图像信息造成破坏。鉴于非局部滤波对加性噪声的优异去噪性能, 本文研究了三种具有代表性的非局部滤波方法, 并使用半导体泵浦固体脉冲激光器搭建主动成像系统, 进行散斑噪声抑制性能的比较。实验表明, 采用同态FM-PatchGP不仅能够有效抑制散斑噪声, 而且能很好地保持边缘信息, 同时满足实时性处理的要求, 在激光主动照明系统中具有良好的应用前景。

Its difficult for traditional speckle suppression methods such as local single pixel filters and transform -domain filters to obtain good suppression effects in laser active imaging. Meanwhile, these methods would broaden edges, so as to damage the information of the image. In view of the excellent suppression performance of non-local filters for additive noise, three representative nonlocal filtering methods are introduced into laser active imaging. An active imaging system was built up to compare the performance of these three methods in speckle noise suppression using a diode-pumped solid-state pulsed laser. Experimental results indicated that homomorphic FM-PatchGP can not only suppress speckle noise effectively, but also preserve edge information while satisfies the real-time requirement, which leads to a good application prospect in laser active lighting systems.