【作者】 洪一帆；

【导师】 夏顺仁；

【作者基本信息】 浙江大学 ， 生物医学工程， 2011， 硕士

【摘要】 随着海洋开发的日益深入,用于水下探测的相关技术也越来越受到人们的重视,成像声纳作为水下探测的核心技术,主要用于探测水下物体的位置形态和测绘水下地形。随着对探测精度与观察效果要求的提高,三维成像声纳应运而生。杭州应用声学研究所研制了基于线阵合成孔径技术的三维成像声纳。作为一种新型声纳系统,它具有许多其他成像声纳无法企及的优越性,但目前尚缺乏有针对性的后处理与可视化系统,这一点使得这种先进声纳尚无法投入应用。针对这一现实需求,论文通过研究现有的图像处理与三维可视化技术,结合三维成像声纳图像的特点,设计实现了一套快速有效的后处理系统。论文首先根据三维成像声纳图像数据的特征确定了系统整体设计思路,对系统的模块设计做了详细说明。为能正确处理三维成像声纳数据并实现更好的系统应用接口,该系统被划分为后处理、显示、文件读写三大模块,并对相关的交互操作设计了良好的接口方便集成应用。然后对后处理这一核心模块中所涉及的图像分割算法、增强算法和可视化算法做了详细介绍,并在各个算法后介绍了该算法是否适宜进行GPU加速以提高处理速度,并对相关算法如何应用GPU加速做了说明。最后通过实验数据对系统进行了功能和性能测试,从中可以看出,论文所设计的系统对于基于线阵合成孔径技术的三维成像声纳后处理具有很好的处理效果,其可视化的运算效率也足以支撑将这种声纳应用于实时探测。更多还原

【Abstract】 With the development of marine, the technologies of underwater exploration obtains more and more attention and imaging sonar is the one of the most important technologies, which is usually used for underwater objects detecting and terrain mapping. In order to improve the detection precision and visual effect, three dimension imaging sonar emerges as the times require.Hangzhou Applied Acoustics Research Institute developed a new three dimension imaging sonar based on linear array synthetic aperture technologies. As a novel imaging sonar, it has many advantages over other imaging sonar, but it is still lack of pertinent post-processing and visualization scheme, which makes such an advanced imaging sonar not put into application. According to this practical need, this thesis designed and implemented a fast and effective post-processing scheme by studying the traditional image processing methods and combining them with the characteristics of three dimension sonar images.Firstly, according to the characteristics of three dimension imaging sonar data, the design concept of the whole system was set up, and the detailed description of design module was-built. In order to handle the three dimension imaging sonar data properly and achieve better system application interface, this system was divided into three modules, such as post-processing module, display module and file read-write module. The interactive operation was designed a good interface for integrated application.Secondly, the image segmentation, enhancement and visualization algorithm involved in post-processing module were described in detail. A note about whether the algorithm suited for being accelerated by GPU programming and how to accelerate it was appended in the end of each algorithm.Finally, the function and performance of this system was completely tested via experimental data. The results shows the system designed and implemented in this thesis can handle image data generate by three dimension image sonar correctly, and the operation efficiency of visualization is fast enough for real-time sonar imaging.更多还原