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Stadardization of Image Processing Techniques for Fractography

断口图像处理技术的标准化

基本信息

批准号：
62302024
负责人：
KOMAI Kenjiro
金额：
$ 8万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Standardization of image processing techniques for fractorgraphy has been promoted and various algorithms and softwares to process and to estimate the fracture surfaces have been developed. The results obtained are as follows.1. In addition to 3 dimensional estimation of shapes and dimensions of corrosion pits, emaluation of dimples and striation spacings as a round robin trial, calculations of facet sizes, inter- and transgranular fracture area fractions, and stretch zone sizes have been successfully conducted with an enough accuracy.2. As for a pre-processing prior to the image analysis, normalizing and flattering of gray levels so as to standardize the photographing condition and to intensify the contrast and/or a median filtering to reduce noises are necessary. In addition, detection of edges and lines as well as some pre-processings to shorten cpu time must be considered.3. To re-construct the 3 dimensional topographies from a stereo photographs the search of identical positions is the most important, and the merits and demerits of the mutual correlation algorithm, the SSDA, and the logic operator one have been made clear.4. As for the evaluation of dimples, area of triangular element method to calculate the net area of fracture surfaces and 3 neighboring pixels one have been devised.5. The threshold method of cross section and the fracture surface vector one to calculate facet sizes, the detection of edges and lines method and the FFT one to calculate striation spacings, the binatization method of co-occurrence matrix and the mapping one of the matrix to calculate inter- and transgranular fracture area fractions, the monotonously increasing section method and the tangent line one to calculate stretch zone sizes have been newly devised. The merits and demerits of those algorithms and the application guide have been systematically made clear.

促进了断口图像处理技术的标准化，开发了各种处理和估计断口表面的算法和软件。取得的结果如下：1.研究结果。除了对腐蚀坑形状和尺寸的三维估计、作为循环试验的韧窝和条纹间距的修正、小平面尺寸、晶间和穿晶断裂面积分数以及拉伸区尺寸的计算外，还成功地进行了足够精确的计算。对于图像分析之前的预处理，需要对灰度进行归一化和平坦化，以规范拍摄条件，增强对比度和/或中值滤波以降低噪声。此外，还必须考虑边缘和线条的检测以及一些预处理，以缩短CPU时间。为了从立体照片中重建三维地形，最重要的是寻找相同的位置，并明确了互相关算法、SSDA算法和逻辑算子One的优缺点。对于韧窝的评价，设计了计算断口净面积的三角单元面积法和3个相邻像素点面积法。提出了计算小面尺寸的截面门限法和断口面矢量法，计算条纹间距的边线检测法和FFT法，计算沿晶和穿晶断裂面积分数的共生矩阵二值化方法和矩阵映射二值化方法，计算拉伸区尺寸的单调递增截面法和切线法。系统地阐述了这些算法的优缺点和应用指南。