粒子图像测速图像的增强
Enhancement of Particle Image Velocimetry Images
摘要：
粒子图像测速（PIV）是一种可视化流动和定量绘制流动图的方法。它被用来获得瞬时速度，涡量，发散，剪切流体等激光多普勒测速和热线风速仪是用于测量流动的其他技术。PIV与这些技术之间的主要区别在于PIV产生二维或三维矢量场。PIV使用两个图像序列（帧），并且帧被分成大量的询问窗口。借助自相关或互相关技术计算每个窗口的位移矢量。在这些过程中丢失数据会导致不准确的结果。为了克服这一点，预处理技术，如直方图均衡化和强度裁剪被用来增强PIV图像，以获得准确的结果。
英文摘要：
Particle Image Velocimetry (PIV) is a method to visualize the flows and quantitatively map the flows. It is used to obtain the instantaneous velocity, vorticity, divergence, shear in fluids, etc. Laser Doppler velocimetry and hot wire anemometry are other techniques that are used to measure the flow. The main difference between PIV and those techniques is that PIV produces two-dimensional or three-dimensional vector fields. PIV uses two sequences of images (frames) and the frames are split into a large number of interrogation windows. The displacement vector is calculated for each window with the help of auto-correlation or cross-correlation techniques. Missing data during these processes leads to inaccurate results. To overcome this, preprocessing techniques such as histogram equalization and intensity clipping are used to enhance the PIV images to obtain accurate results.
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