纹影干涉图的图像处理方法研究

本文利用计算机存贮量大、运算能力强的特点研究了一种分析纹影干涉图,计算密度场的图像算法。这套算法包括使用低通滤波技术消除干涉图背景中的高频噪声,使用 Hilditch 算法细化宽度多于一个像素的干涉条纹,使用模式识别方法提取干涉条纹的位移量,最后应用数值积分技术求解密度场的空间分布。这里研究的图像处理方法提高了纹影干涉图定量分析的精度、加快了实验结果的处理速度,给出了直观可靠的数值结果,是一种实用有效的图像算法。

THE INVESTIGATION OF THE IMAGE PROCESSING METHOD FOR A SCHLIEREN INTERFEROGRAM

In this paper,by taking advantage of the large memory andthe powerful calculation ability of computers,the image processingmethod has been investigated for the analysis of the schlieren interfer-ogram and calculation of whole density field.The methods include the2-D low-pass filtering used for eliminating the high frequency noise inthe background of the schlieren interferogram,the Hilditch's algorithms-used for thinning the width of interferometric fringes which has more thanone pixel,the modelrecognition technique used for extracting fringe shiftsof interferometric fringes and setting up the relavant physical space,and the numerical integration method used for calculating the spatial dis-tribution of the density field. By using the image processing method pro-posed here,the accuracy of the quantitative analysis of schlieren interfer=ogram can be improved,a lot of time can be saved to deal with experimen-tal results,and the more reliable results can be obtained.Thus,the al-gorithm is useful and efficient.