【摘要】 为了克服水下探测中后向散射光背景噪音的影响,提出了非均匀光场水下探测方法,推导得出非均匀光场的照度分布函数与接收口径、目标与接收器的距离以及海水的体积衰减系数几个因素有关.通过搭建集束光水下图像系统,对其产生的非均匀光场的分布特性和水下探测特性进行了水池实验.观测结果为,在0.6倍能见度下,可分辨1mm细节,在1倍能见度时,可分辨目标轮廓,在1.5倍能见度时,可探测到目标.结果证明,该系统具有宽视角、全景深、图像清晰度高等特点.更多还原

【Abstract】 An underwater image detection theory of inhomogeneous illumination field is proposed to reduce the backward of scattered background noise. The distribution function of inhomogeneous illumination field is derived. It is related to receive aperture, distance between target and receiver as well as seawater volume attenuation coefficient. An underwater image detection system with distributive light of central power is developed. The tank contrast experiment is proposed, which verifies the inhomogeneous illumination field′s distribution characteristics and underwater probing characteristics. It can clearly distinguish 1 mm details at 0.6 times visibility and identify targets outlined at one times visibility, as well as detect the target at 1.5 times visibility.The underwater system based on inhomogeneous illumination field theory is effective to overcome the influence of backward scattered background noise. These results suggest that this system has a far detection distance, wide visual angle, full view depth and good image definition.更多还原