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水利工程三维模型试验变形的数码摄影监测 被引量:2
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作者 赵中原 张强勇 《水电能源科学》 北大核心 2009年第5期69-71,共3页
在水利工程隧道三维立体模型观测面设置测量标点,采用数码相机监测模型试验过程,通过数码图像识别监测物体变形前后标记点的变形数据。基于BP神经网路的图像识别,对某隧道施工开挖、加固过程进行三维地质力学模型试验,取得了满意的观测... 在水利工程隧道三维立体模型观测面设置测量标点,采用数码相机监测模型试验过程,通过数码图像识别监测物体变形前后标记点的变形数据。基于BP神经网路的图像识别,对某隧道施工开挖、加固过程进行三维地质力学模型试验,取得了满意的观测结果,为三维力学模型试验收敛变形观测提供了一种新方法。 展开更多
关键词 三维地质力学模型试验 施工过程模拟 BP神经网络 影像点集
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Segmentation and focus-point location based on boundary analysis in forest canopy hemispherical photography 被引量:1
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作者 Jia-yin SONG Wen-long SONG +1 位作者 Jian-ping HUANG Liang-kuan ZHU 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2016年第8期741-749,共9页
Analysis of forest canopy hemisphere images is one of the most important methods for measuring forest canopy structure parameters. In this study, our main focus was on using circular image region segmentation, which i... Analysis of forest canopy hemisphere images is one of the most important methods for measuring forest canopy structure parameters. In this study, our main focus was on using circular image region segmentation, which is the basis of forest canopy hemispherical photography. The boundary of a forest canopy hemisphere image was analyzed via histogram, rectangle, and Fourier descriptors. The image boundary characteristics were defined and obtained based on the following:(1) an edge model that contains three parts, i.e., step, ramp, and roof;(2) boundary points of discontinuity;(3) an edge that has a linear distribution of scattering points. On this basis, we proposed a segmentation method for the circular region in a forest canopy hemisphere image, fitting the circular boundary and computing the center and radius by the least squares method. The method was unrelated to the parameters of the image acquisition device. Hence, this study lays a foundation for automatically adjusting the parameters of high-performance image acquisition devices used in forest canopy hemispherical photography. 展开更多
关键词 Fisheye lens Least squares method Image segmentation Ecology in image processing Hemispherical photography
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