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本文借助微型计算机进行实时采集、处理和分析氢气泡流动显示的图像.研制了氢泡流场采集和处理系统。系统组成包括氢泡流场显示仪,IBM-PC/XT 微型计算机、CCD 图像传感器,图像输入接口及各种图像处理,分析软件.针对氢泡示踪及视频信号的特点,运用数字图像相关运算,提出能获得同一时刻流场速度的高精度算法.避免了大量的流场氢泡照片的冲洗工作,克服了人工读数的困难,提高了量测的精度和自动化程度.作为实际应用。还处理和分析了灌河口航道物理模型中流速场的氢泡时间线图像,获得了在潮汐水流作用下航道内的流速大小和方向.结果是今人满意的.
In this paper, real-time acquisition, processing and analysis of the images of hydrogen bubble flow display are performed by means of microcomputer, and a system for collecting and processing hydrogen bubble flow field is developed. The system consists of bubble flow field display, IBM-PC / XT microcomputer, CCD image sensor, image input interface and a variety of image processing and analysis software.According to the characteristic of hydrogen bubble tracking and video signal, , Proposed a high-precision algorithm that can obtain the same velocity at the same time.It avoids a large number of flushing photos of the flow field, overcomes the difficulty of manual reading, and improves the measurement accuracy and automation degree.As a practical application. We also processed and analyzed the time-lapse image of the velocity field in the physical model of the channel in the Gulou estuary, and obtained the magnitude and direction of velocity in the channel under the tidal current.