图像中的文字在当下相机高速发展下显得尤为重要,人们开始通过拍摄照片直接进行图像上文字的识别,最常用的就是寄快递收寄地址的识别。其中用到的技术是OCR(optical character recognition)字符识别技术,其中文名字叫做光学字符识别。...图像中的文字在当下相机高速发展下显得尤为重要,人们开始通过拍摄照片直接进行图像上文字的识别,最常用的就是寄快递收寄地址的识别。其中用到的技术是OCR(optical character recognition)字符识别技术,其中文名字叫做光学字符识别。它是利用光学技术和计算机技术通过检测字符每个像素的暗、亮模式确定其形状,然后用字符识别方法将形状翻译成计算机文字的过程。随着日常生活网络化的推进,各种纸质文档的数字化智能化识别进程也在加速。经过二十世纪九十年代的发展,对字符识别技术的研究已经取得了很大的进展,市场上目前正在使用的各种OCR识别软件层出不穷。但是以往对证件的识别是一个比较大的难题。文中的研究主要是对普通的文字进行识别。识别系统包括三个模块:图像预处理、图像分割、字符识别。前两个模块又包含图像的二值化分析、灰度化等,对其进行了描述。展开更多
The estimation of shear strength of rock mass discontinuity is always a focal, but difficult, problem in the field of geotechnical engineering. Considering the disadvantages and limitation of exist- ing estimation met...The estimation of shear strength of rock mass discontinuity is always a focal, but difficult, problem in the field of geotechnical engineering. Considering the disadvantages and limitation of exist- ing estimation methods, a new approach based on the shadow area percentage （SAP） that can be used to quantify surface roughness is proposed in this article. Firstly, by the help of laser scanning technique, the three-dimensional model of the surface of rock discontinuity was established. Secondly, a light source was simulated, and there would be some shadows produced on the model surface. Thirdly, to obtain the value of SAP of each specimen, the shadow detection technique was introduced for use. Fourthly, compared with the result from direct shear testing and based on statistics, an empirical for- mula was found among SAP, normal stress, and shear strength. Data of Yujian （~ River were used as an example, and the following conclusions have been made. （1） In the case of equal normal stress, the peak shear stress is positively proportional to the SAP. （2） The formula for estimating was derived, and the predictions of peak-shear strength made with this equation well agreed with the experimental re- suits obtained in laboratory tests.展开更多
文摘图像中的文字在当下相机高速发展下显得尤为重要,人们开始通过拍摄照片直接进行图像上文字的识别,最常用的就是寄快递收寄地址的识别。其中用到的技术是OCR(optical character recognition)字符识别技术,其中文名字叫做光学字符识别。它是利用光学技术和计算机技术通过检测字符每个像素的暗、亮模式确定其形状,然后用字符识别方法将形状翻译成计算机文字的过程。随着日常生活网络化的推进,各种纸质文档的数字化智能化识别进程也在加速。经过二十世纪九十年代的发展,对字符识别技术的研究已经取得了很大的进展,市场上目前正在使用的各种OCR识别软件层出不穷。但是以往对证件的识别是一个比较大的难题。文中的研究主要是对普通的文字进行识别。识别系统包括三个模块:图像预处理、图像分割、字符识别。前两个模块又包含图像的二值化分析、灰度化等,对其进行了描述。
基金supported by the China Geological Survey (No.1212011014030)the Major State Basic Research Development Program of China (973 Program) (No.2011CB710600)
文摘The estimation of shear strength of rock mass discontinuity is always a focal, but difficult, problem in the field of geotechnical engineering. Considering the disadvantages and limitation of exist- ing estimation methods, a new approach based on the shadow area percentage （SAP） that can be used to quantify surface roughness is proposed in this article. Firstly, by the help of laser scanning technique, the three-dimensional model of the surface of rock discontinuity was established. Secondly, a light source was simulated, and there would be some shadows produced on the model surface. Thirdly, to obtain the value of SAP of each specimen, the shadow detection technique was introduced for use. Fourthly, compared with the result from direct shear testing and based on statistics, an empirical for- mula was found among SAP, normal stress, and shear strength. Data of Yujian （~ River were used as an example, and the following conclusions have been made. （1） In the case of equal normal stress, the peak shear stress is positively proportional to the SAP. （2） The formula for estimating was derived, and the predictions of peak-shear strength made with this equation well agreed with the experimental re- suits obtained in laboratory tests.
