【摘要】 使用计算机断层扫描技术进行原木无损检测,采用多重分形频谱分析方法可以对原木CT图像进行有效的边缘检测,该方法首先计算图像各像素点的H lder指数α(x,y),然后估计出其多重分形频谱f(α)的值,对图像的像素点进行分类,f(α)=1为平滑边缘点,1≤f(α)<1.5为奇异边缘点。根据多重分形理论,平滑点和奇异点的集合即为图像的边缘点。实验结果表明,该方法对原木CT图像的边缘检测具有良好的效果,并具有较好的局部性,为原木CT图像的边缘检测提供了一种新方法。更多还原

【Abstract】 Computed tomography technology was used for the log nondestructive testing,a method was adopted to detect the edge effectively in log CT image based on multifractal analysis in this paper.The Hlder exponent of image pixels was calculated first,then its multifractal spectrum was estimated and different image pixels were classified.f(a)=1,smoothing edge points;1≤f(a)<1.5,singular edge points.Based on multifractal theory,the set of both singular edge points and smoothing edge points is the set of image edge points.Experiment results showed that this method of log CT image edge detection was a more effective and more local method.It provided a new method for log CT edge detection.更多还原