基于霍夫变换的数字全息粒子尺寸测量

Digital Holographic Particle Sizing with Hough Transform

提出一种基于霍夫(Hough)变换的数字全息粒子尺寸测量方法。该方法是先对粒子场全息图的数字再现像进行聚焦像合成、图像边缘提取处理后,再通过Hough变换圆检测得到粒子尺寸大小和位置信息,实现粒子信息的测量。分别对2D粒子场和3D粒子场进行了计算机模拟,并以直径为90μm标准粒子为研究对象进行了实验研究,测量绝对误差为6μm。研究结果证明了该方法的可行性。

A new method for particle size measurement of digital holography by Hough transform is proposed. The numerically reconstructed images of a particle-field hologram are approached in a way that in focus images of particle in the volume are integrated into a plane and the edge of particle image is extracted, then by using Hough transform, the particle information of the size and the location is obtained. Computer simulations of the 2D and 3D particle fields are performed. The experiment is conducted for the field of diameter 90 μm standard particle, and the measuring absolute error is 6μm. The research results show that the method is feasible.