湍流环境中水下成像系统的调制传递函数研究
发布时间：2018-11-20 14:31
【摘要】：为了研究湍流对水下成像系统的影响,搭建了一套光学成像实验系统,利用水泵和水槽制造流速可控的湍流实验区域,使用CCD对正弦条纹目标成像,并分析图像质量。通过对实验环境的控制,得到不同浑浊度和不同流速下的成像结果,并提取调制传递函数(MTF)对结果进行分析。结果表明,悬浮颗粒散射在整个空间频率上造成调制对比度下降;而湍流散射更容易造成高空间频率域的MTF下降;随着进水口处流速的增加以及水体衰减系数的增大,其MTF曲线加快衰减;在湍流环境下的成像,图像失真和分辨率下降由颗粒散射和湍流散射共同造成。
[Abstract]:In order to study the effect of turbulence on underwater imaging system, an optical imaging experimental system was built. The flow velocity controlled turbulent experimental region was manufactured by using water pump and flume. CCD was used to image the sinusoidal fringe target and the image quality was analyzed. By controlling the experimental environment, the imaging results of different turbidity and velocity were obtained, and the modulation transfer function (MTF) was extracted to analyze the results. The results show that the scattering of suspended particles decreases the modulation contrast in the whole spatial frequency, while the turbulent scattering leads to the decrease of MTF in the high spatial frequency domain. With the increase of the velocity at the inlet and the increase of the attenuation coefficient of the water body, the MTF curve decreases rapidly, and the image distortion and the resolution decrease in the turbulent environment are caused by particle scattering and turbulent scattering.
【作者单位】： 华中科技大学光学与电子信息学院;
【基金】：国家自然科学基金(41276042,61008050)
【分类号】：O357.5
，
本文编号：2345164
[Abstract]:In order to study the effect of turbulence on underwater imaging system, an optical imaging experimental system was built. The flow velocity controlled turbulent experimental region was manufactured by using water pump and flume. CCD was used to image the sinusoidal fringe target and the image quality was analyzed. By controlling the experimental environment, the imaging results of different turbidity and velocity were obtained, and the modulation transfer function (MTF) was extracted to analyze the results. The results show that the scattering of suspended particles decreases the modulation contrast in the whole spatial frequency, while the turbulent scattering leads to the decrease of MTF in the high spatial frequency domain. With the increase of the velocity at the inlet and the increase of the attenuation coefficient of the water body, the MTF curve decreases rapidly, and the image distortion and the resolution decrease in the turbulent environment are caused by particle scattering and turbulent scattering.
【作者单位】： 华中科技大学光学与电子信息学院;
【基金】：国家自然科学基金(41276042,61008050)
【分类号】：O357.5
，
本文编号：2345164
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