光线传播方式对田间图像分割效果影响的研究

光线按传播方式分直射光和漫射光。在田间图像中,光线传播方式与背景土壤干湿程度一同影响叶片镜面反射现象的形成。针对这一现象,在自然光照条件下按太阳光直射和漫射、背景土壤干湿分为4种情况采集图像。采用常用的超绿特征(2G-R-B)和H特征作为分割特征,分别使用Otsu阈值分割、全局阈值分割两种方法分割田间图像进行对比实验。在田间实验中,每组田间图像包括4幅原始图像,按不同分割特征、不同分割方法进行4次图像分割。在7组田间图像的分割实验中,分割结果表明背景土壤潮湿环境下太阳光漫射条件下田间图像的分割误差小于其它三种情况。这为相关田间机器视觉设备的开发提供了理论基础。

The Research on the segmentation effect of the field images with light propagation mode

Light divides direct light and diffused light according to the mode of propagation. In the field images, the light propagation mode and the degree of wetness of the soil in the background both affect the formation of the specular reflection. In view of this phenomenon, in the natural light conditions, according to direct sunlight and diffuse, background soil dry and wet divided into 4 kinds of circumstances to obtain original field images. Using the commonly used green features (2G-R-B) and H features as segmentation features, two thresholding determination methods of Otsu threshold segmentation and global threshold segmentation were used to segment the original field images respectively. In the experiment, the field images of each object contain 4 original images, and 4 original images are segmented according to different segmentation features and different segmentation thresholding determination methods. In the segmentation experiment of 7 objects, the segmentation results show that the segmentation error of the field image under the environment of sunlight diffusion in the wet soil background is less than the other three cases. This provides a theoretical basis for the development of related field machine vision equipment.