雨滴成像中的散焦模糊复原方法及应用

针对自主研制的降水微物理特征测量仪存在的成像质量问题，重点考虑与光源相关的散焦模糊，提出了基于点扩散函数的雨滴图像复原方法，利用圆盘函数对雨滴图像进行复原，消除噪声和模糊，得到具有清晰轮廓的雨滴图像。利用与雨滴光学性质相近的玻璃球进行了定标实验，确定了成像系统散焦模糊的半径和图像二值化的阈值。外场实测结果表明，图像复原可以有效修正雨滴尺度及其谱分布，测量得到的雨滴谱和降雨强度与激光雨滴谱仪的结果具有很好的一致性。该方法应用于降水微物理特征测量仪，可以显著提高雨滴谱及其他微物理特征的测量性能。

Defocus Blurred Restoration Method for Raindrops Imaging and Its Application

Aiming at the raindrops imaging degradation of precipitation micro-physical characteristics sensor (PMCS), and consider the defocus blurring due to light source, a raindrop images restoration method based on point spread function (PSF) is proposed. Sharp images of raindrops can be obtained by the disk function. The radius of defocus blurring and thresholds of images binarization are determined by the calibration experiment of a series of glass balls, which have similar optical features with raindrops. The field experiment results show that the images restoration method can precisely correct the raindrops size and their distribution, the raindrop size distribution and rainrate measured by PMCS are in good agreement with the measurements of laser disdrometer. The application of images restoration method can promote the performance of raindrop size distribution, and other micro-physical characteristics measured by PMCS.