Measurement of wave surface using stereo stereophotogrammetry

在过去的十年里，人们利用两个摄像机的图像对波面分布进行了大量的研究。这些研究分析了摄像机拍摄的数字图像的方位差。这些研究的问题是在两个图像之间找到相同的元素。通常将目标或示踪剂放置在图像中来解决方位差问题。这种方法源于粒子图像测速(PIV)方法，对于波浪的测量是足够的。然而，这种方法很难在水面上均匀放置适当数量的目标或示踪剂，这对测量海浪是不合理的。用不含示踪剂和靶标的实验水箱测量了波的剖面。我们产生了几种规则波，用两台数码相机拍摄，并用立体匹配法分析了数字图像中的方位差。

Over the past decade, a considerable number of studies have been conducted on the wave plane distributions by using two video camera images. These studies analyzed azimuth difference of digital images taken by video cameras. The problem of these studies is to find the same element between two images. Generally, they put the targets or tracers in images to solve azimuth difference. This way which comes from Particle Image Velocimetry (PIV) method, is sufficiency to measure waves. However, this method involves difficulties to put the appropriate number of targets or tracers on water surface evenly, which is not reasonable to measure sea waves. We had measured wave profile using experimental water tank without tracers or targets. We generated a few kinds of regular waves and took the pictures by two digital cameras and analyzed the azimuth difference in digital images by stereo matching method.