3-D noise analysis of underwater laser image sequence
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摘要: 为了研究距离选通水下激光成像系统输出图像帧序列的噪声特性,采用3维噪声分析方法,进行了理论分析和实验验证。为了解决实验数据集背景不均匀、样本数较少的问题,根据单帧图像生成综合噪声图像,组成模拟数据集,取得了模拟数据集和实验数据集的3维噪声分析计算的数据,并进行了比较。结果表明,描述数据集在3个方向上均随机变化的"瞬态像素噪声"分量是距离选通水下激光图像序列的主要噪声源;同时,时域噪声的影响远大于空域噪声。这一结果对距离选通水下激光成像系统设计和图像去噪算法设计是有帮助的。Abstract: In order to study the noise characteristics of image frame sequence in a range-gated underwater laser imaging system,the method of 3-D noise analysis was adopted.In order to solve the problem of non-uniformity and sample inadequacy of the experimental data sets,simulated data set was composed of synthesized noise images produced according to single image frame.The calculation results of 3-D noise analysis based on the simulated data set and experimental data set were compared, which showed that the instant pixel noise describing the random variety along three directions was the main noise source in rangegated underwater laser image sequence and the effect of temporal noise was more severe than the spatial noise.Those results are helpful in the design of range-gated underwater laser imaging system and image denoising algorithm.
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Keywords:
- imaging system /
- noise characteristics /
- 3-D noise analysis /
- synthesized noise image
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