【摘要】：為了研究湍流對水下成像系統(tǒng)的影響,搭建了一套光學(xué)成像實(shí)驗(yàn)系統(tǒng),利用水泵和水槽制造流速可控的湍流實(shí)驗(yàn)區(qū)域,使用CCD對正弦條紋目標(biāo)成像,并分析圖像質(zhì)量。通過對實(shí)驗(yàn)環(huán)境的控制,得到不同渾濁度和不同流速下的成像結(jié)果,并提取調(diào)制傳遞函數(shù)(MTF)對結(jié)果進(jìn)行分析。結(jié)果表明,懸浮顆粒散射在整個(gè)空間頻率上造成調(diào)制對比度下降;而湍流散射更容易造成高空間頻率域的MTF下降;隨著進(jìn)水口處流速的增加以及水體衰減系數(shù)的增大,其MTF曲線加快衰減;在湍流環(huán)境下的成像,圖像失真和分辨率下降由顆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.
【作者單位】： 華中科技大學(xué)光學(xué)與電子信息學(xué)院;
【基金】：國家自然科學(xué)基金(41276042,61008050)
【分類號】：O357.5
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本文編號：2345164