高重频距离选通水下激光雷达图像噪声特性分析

摘要

High-repetition-rate range-gated underwater lidar imaging is achieved by multi-pulse accumulation. Noise characteristic analysis of the high-repetition-rate range-gated underwater lidar image is a necessary step for further improving the imaging quality by image post-processing. Through an analysis of the characteristics of both additive noise and multiplicative noise, noise characteristics of the single pulse range-gated underwater lidar image, high-repetition-rate range-gated underwater lidar image and multi-frame averaged high-repetition-rate range-gated underwater lidar image are analyzed. The experimental results show that:1 ) The single pulse range-gated underwater lidar image is mainly affected by the multiplicative noise;2 ) The high-repetition-rate range-gated underwater lidar image is affected by both the additive noise and multiplicative noise;and 3) After multi-frame averaged, the high-repetition-rate range-gated underwater lidar image mainly contains multiplicative noises.%高重频距离选通水下激光雷达采用多脉冲累积方式成像。分析高重频距离选通水下激光雷达图像噪声特性，是进一步采用图像后期处理方式提高成像质量的必要工作。通过对加性噪声和乘性噪声特性进行分析，对单脉冲距离选通水下激光雷达图像、高重频距离选通水下激光雷达图像和经多帧平均后的高重频距离选通水下激光雷达图像的噪声特性进行了分析。实验结果表明，单脉冲距离选通水下激光雷达图像主要受到乘性噪声的影响，高重频距离选通水下激光雷达图像受到加性噪声和乘性噪声两种噪声的双重影响，并且当对高重频距离选通水下激光雷达图像做多帧累加平均后，图像主要含有乘性噪声。