基于区域色彩纹理特征描述和DPF匹配的图像检索

该文给出了一种彩色图像检索的新方法。在特征描述时,首先划分连通区域,进而求取勒让德色度矩和纹理共生矩阵,获取区域的色彩和纹理特征(Regional Color and Texture,RCT);在相似度匹配时,将动态局部距离函数(Dynamic Partial distance Function,DPF)应用到动态区域匹配中。实验结果显示,该RCT-DPF方法对彩色图像检索是有效的,并且优于纹理共生矩阵、基于色彩连通的图像纹理检索方法和非DPF区域匹配的多特征描述方法。

基于纹理谱及其空间特征的图像检索

针对传统纹理谱描述符维数较高且忽略了空间特征的问题,一方面进一步考虑邻域中心像素与其它像素间的灰度关系,改进了中心对称局部二值模式纹理谱描述符,另一方面基于灰度共生矩阵提出了纹理谱基元共生矩阵的概念,并据此来提取纹理谱基元空间特征。通过不同图像库进行实验,结果表明,结合所提取的空间特征,可明显地提高传统纹理谱描述符的检索性能,而且所提出的描述符以较低的维数取得了较好的检索效果。

基于SVM的POL-SAR图像分类研究

提出了一种将物理散射机理、纹理信息和SVM结合起来用于POL-SAR图像分类的方法。实验数据选取德国Oberpfaffenhofen实验区域(DE)的DLR ESARL波段全极化数据,实验区域包括自然植被,如森林、田地和人造目标如建筑、机场跑道等。首先利用OEC分解得到了散射特征,然后提取HH和HV通道图像的纹理特征,并用SVM进行特征选择及分类。然后在上述特征中加入Freeman分解的散射特征重复试验,取得了较好的结果。试验证明了将散射特征和纹理特征结合起来对地物进行分类是有效的,同时也证明了用SVM进行特征选择的有效性。

Texture features analysis on micro-structure of paste backfill based on image analysis technology

The strength of cement-based materials,such as mortar,concrete and cement paste backfill(CPB),depends on its microstructures(e.g.pore structure and arrangement of particles and skeleton).Numerous studies on the relationship between strength and pore structure(e.g.,pore size and its distribution)were performed,but the micro-morphology characteristics have been rarely concerned.Texture describing the surface properties of the sample is a global feature,which is an effective way to quantify the micro-morphological properties.In statistical analysis,GLCM features and Tamura texture are the most representative methods for characterizing the texture features.The mechanical strength and section image of the backfill sample prepared from three different solid concentrations of paste were obtained by uniaxial compressive strength test and scanning electron microscope,respectively.The texture features of different SEM images were calculated based on image analysis technology,and then the correlation between these parameters and the strength was analyzed.It was proved that the method is effective in the quantitative analysis on the micro-morphology characteristics of CPB.There is a significant correlation between the texture features and the unconfined compressive strength,and the prediction of strength is feasible using texture parameters of the CPB microstructure.

基于无人机的丘陵果园病虫害监测系统研究

针对丘陵地区果树种植过程中出现的相关病虫害预防难、监测效率低等问题,课题组通过无人机硬件选型、无人机在丘陵地区的飞行关键技术设计、高光谱成像技术运用、图像分割和共生矩阵纹理特征分析,实现高光谱图像的获取和处理,设计了丘陵果园病虫害监测系统方案。仿真结果表明:相较于传统的航天、航空遥感技术,无人机遥感技术可以高效率地获取空间信息,具有机动灵活、时效性高、简洁安全、经济的优点;无人机载高光谱相机对丘陵果园病虫害进行监测,可以实现对丘陵果园病虫害的及时预防与精准监测。