小波理论在植物根系图像边缘检测中的应用

在植物根系的研究中,所提取出的植物根系图像往往噪声较大,而采用传统的图像边缘检测方法检测出来的边缘信息都无法达到令人满意的效果。针对这一问题,本文基于小波理论的知识,提出了运用小波多尺度变换检测植物根系图像边缘的方法。利用一个平滑函数,在不同的尺度下平滑所要检测的图像信号,根据平滑后信号小波变换系数模的一阶或二阶导数找出信号的突变点也即边缘点。一阶导数的极值点对应二阶导数的零交叉点和平滑后信号的拐点。因此可由小波变换模局部极大值检测图像边缘。

Application of Wavelet Theory in the Edge Detection of Plant Roots Image

In the study of plant roots,due to the noise of the image,using the traditional image edge detection method to detect the edge can't obtain satisfactory results.Therefore,this paper based on wavelet theory proposes to use the multi-scale wavelet transform to detect the edge of roots image.Make use of a function,at different scales,to smooth the image signal to be detected,and identify the mutational point namely edge point according to the first-order or second-order derivative of the modulus of the signal'...