Image Analysis

本研究提出在确定湍流细节方面取得重大进展，通过使用数字图像处理和跟踪技术来获得空间和时间上的完整瞬时测量（速度矢量，涡量和应变场），以确定边界层和管道流动中的几种已确定的湍流。通过对立体膜中的粒子流标记进行逐帧跟踪，可以获得空间和时间上的详细矢量速度场数据。根据这些测量结果，将计算涡度场和应变率场。为了完成这种分析，必须以一种相当自动化的方式处理大量数据。本研究建议从视觉记录中建立所需的数字信息类型，然后开发必要的软件以有效的方式提取该信息。

This research proposes to make a major advance in determining the details of turbulent flows by using digital image processing and tracking techniques to obtain complete instantaneous measurements (velocity vectors, vorticity, and strain fields) in space and time for several well-established turbulent flows in boundary layers and in pipe flows. Detailed vector velocity field data in both space and time will be obtained by a frame-by-frame tracking of particle flow markers in stereoscopic films. From these measurements, vorticity and strain rate fields will be calculated. To accomplish this analysis, massive amounts of data must be processed in a reasonably automatic way. This research proposes to establish the type of digital information needed from the visual records and then develop the software necessary to extract that information in an efficient manner.