利用水下平行光管测量水下相机成像分辨率

水下光学成像是重要的水下探测方式。现有水下相机成像检测方法受到水体本身以及测量方法的影响，难以准确进行成像分辨率检测。提出了基于水下平行光管的水下相机成像分辨率检测技术，通过在水中产生平行光束，直接对水下相机成像分辨率进行检测。通过仿真得出：水下平行光管在水中可见光和空气中单波长的调制传递函数(Modulation Transfer Function, MTF)基本一致。利用这一结论，提出了水下平行光管空气中装调检测的方法。针对实验室所研制的一款水下相机开展实验测试，其在水中可见光与空气中635 m光源照明条件下的分辨率相同。实验结果表明，所提出的基于水下平行光管的水下相机成像分辨率检测方法可有效消除水体对分辨率测量的影响，实现水下相机成像分辨率的准确测量。

Measurement of underwater camera imaging resolution using underwater collimator

Underwater optical imaging is an important underwater measurement method. The existing underwater camera imaging resolution measurement method is affected by the water body and the measurement method, and it is difficult to accurately measure the imaging resolution. The underwater camera imaging resolution measurement technology based on an underwater collimator is proposed to directly measure the underwater camera imaging resolution by generating parallel light beams in the water. Through simulation, the modulation transfer function (MTF) of the underwater collimator in visible light in water and single wavelength in the air are basically the same. In conclusion, a method for adjusting the underwater collimator in the air is proposed. The experimental test is carried out for an underwater camera developed in the laboratory, and its resolution under the condition of visible light in water and a 635 nm light source in the air is the same. The experimental results show that the proposed underwater camera imaging resolution measurement method based on the underwater collimator can effectively eliminate the influence of water on the measurement and realize the accurate measurement of the underwater camera imaging resolution.