水下激光图像增强方法研究

由于水体对光存在着不可克服的吸收和散射效应,距离选通水下激光成像系统所获得的图像存在不同程度的劣化问题.为提高图像质量,在分析水下激光图像特点的基础上,针对常规直方图均衡化的不足,提出了用阈值分割直方图,高灰度区和低灰度区分别进行均衡化,再压缩组合的分段的直方图均衡化方法,并和边缘保护平滑滤波结合应用于水下激光图像增强.通过实验,验证了该算法能达到抑制背景噪声、突出目标细节、提高对比度的效果,对水下激光图像增强十分有效.

Study of Enhancement Technology in Underwater Laser Imaging

The images which were acquired by underwater range-gated imaging system have degradation for the reasons of scattering and absorption of water.To advance the quality and overcome the disadvantage of common histogram equalization,a new method was proposed based on analysis of characteristic of underwater laser imaging.After filtering by edge-preserving smoothing,it split the histogram,the parts of high gray and low gray were equalized separately,and then combinated.The experiment shows that the method proposed above is very effective in enhancement of underwater laser imaging to restain background noise,clear object details and advance contrast.