基于Otsu和FMM方法的风洞试验图像修复

江涛; 李强; 陈苏宇; 常雨; 张扣立

doi:10.7527/S1000-6893.2019.23293

航空学报 >

2020 , Vol. 41 >Issue 2: 123293 - 123293

DOI: https://doi.org/10.7527/S1000-6893.2019.23293

流体力学与飞行力学

基于Otsu和FMM方法的风洞试验图像修复

江涛 ,
李强 ,
陈苏宇 ,
常雨 ,
张扣立

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中国空气动力研究与发展中心超高速空气动力研究所, 绵阳 621000

收稿日期: 2019-07-17

修回日期: 2019-08-13

网络出版日期: 2019-09-23

基金资助

国家重点研发计划（2016YFA0401201）

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Image inpainting of wind tunnel test based on Otsu method and FMM

JIANG Tao ,
LI Qiang ,
CHEN Suyu ,
CHANG Yu ,
ZHANG Kouli

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Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China

Received date: 2019-07-17

Revised date: 2019-08-13

Online published: 2019-09-23

Supported by

National Key Research and Development Program of China (2016YFA0401201)

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摘要

各种光学测试技术在风洞试验中应用越来越广泛，图像中的破损或无关信息均会影响数据的处理和分析。以存在缺陷的风洞纹影图像为例，对数字图像修复技术进行了研究。根据缺陷离散分布、大小及形状各异，核心区域的灰度值较低以及边缘处灰度梯度变化较大等特点，将图像修复流程设计为确定待处理区域、缺陷识别和缺陷修复等3个步骤。前2个步骤使用Otsu算法进行图像的分割处理，然后使用快速行进方法（FMM）完成缺陷修复。经处理，纹影图像的缺陷被自动识别，并得到了减少或削弱，而且修复的信息客观合理。该方法可推广至其他光学测试技术的图像修复。

关键词： 图像修复; Otsu算法; 快速行进方法; 纹影; 光学; 风洞试验

本文引用格式

江涛 , 李强 , 陈苏宇 , 常雨 , 张扣立 . 基于Otsu和FMM方法的风洞试验图像修复[J]. 航空学报, 2020 , 41(2) : 123293 -123293 . DOI: 10.7527/S1000-6893.2019.23293

Abstract

Many kinds of optics test technologies have been applied broadly in wind tunnel test, but the breakages and irrelevant information of images could affect data processing and analysis. Taking schlierern images with defects as an example, the image inpainting technology is studied. According to the characteristics of the image defects such as discrete, variable in shape and size, low gray levels of core regions and large gray gradients on the edges of defects, the image inpainting workflow is divided into pending regions determination, defects identification, and defects inpainting. The Otsu method is used to segment images in Step 1 and Step 2, and the Fast Marching Method (FMM) is applied to inpaint the defects in Step 3. After image inpainting, the defects of schlieren images are automatically identified and reduced or weakened, and the inpainting information is objective and reasonable. This image inpainting method could be extended to other optics test technologies in wind tunnel test.

Key words： image inpainting; Otsu method; fast marching method; schlieren; optics; wind tunnel test

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