Although initiated more than 20 years ago, there has been an explosion of scientific interest in computerized recognition of human faces in recent years. In this survey, we give an introductory course of this area. Ou...Although initiated more than 20 years ago, there has been an explosion of scientific interest in computerized recognition of human faces in recent years. In this survey, we give an introductory course of this area. Our focusis put on some new techniques, whose advantages and disadvantages are reviewed. Also, this survey summarizes thework of this area done in China. Finally, some conclusions are given.展开更多
基于主动视觉的摄像机标定是摄像机标定的重要分支之一.本文引入了必要的基础知识和概念,诸如摄像机模型和投影矩阵,基础矩阵,单应矩阵,极点,FOE（Focus Of Expansion）等.还对基于摄像机纯旋转的标定、基于摄像机三正交平移运动的标定...基于主动视觉的摄像机标定是摄像机标定的重要分支之一.本文引入了必要的基础知识和概念,诸如摄像机模型和投影矩阵,基础矩阵,单应矩阵,极点,FOE（Focus Of Expansion）等.还对基于摄像机纯旋转的标定、基于摄像机三正交平移运动的标定、基于多次摄像机平面正交运动的标定、基于无穷远平面单应矩阵的标定以及基于射影重建的标定进行了评述并给出了结论.展开更多
针对成捆原木自动化检尺中原木端面径级检测的关键问题,采用双目立体视觉及图像分割的原理,完成原木径级的快速三维测量.根据原木的直方图特征,提出基于最大熵阈值分割的区域标识算法,设定动态阈值,实现对原木端面与背景的精确分割.将...针对成捆原木自动化检尺中原木端面径级检测的关键问题,采用双目立体视觉及图像分割的原理,完成原木径级的快速三维测量.根据原木的直方图特征,提出基于最大熵阈值分割的区域标识算法,设定动态阈值,实现对原木端面与背景的精确分割.将提取的左右图像中原木端面边缘,借助ORB(Oriented FAST and Rotated BRIEF)特征点检测方法,与极线几何理论相结合完成原木边缘的快速立体匹配,得到三维坐标.此外以成捆原木为检测对象,进行原木边缘图像的最小二乘法椭圆拟合,确定原木端面长、短径参数.实验结果表明:该算法能够在10s内完成原木径级的检测,测量误差在2mm内.展开更多
文摘Although initiated more than 20 years ago, there has been an explosion of scientific interest in computerized recognition of human faces in recent years. In this survey, we give an introductory course of this area. Our focusis put on some new techniques, whose advantages and disadvantages are reviewed. Also, this survey summarizes thework of this area done in China. Finally, some conclusions are given.
文摘基于主动视觉的摄像机标定是摄像机标定的重要分支之一.本文引入了必要的基础知识和概念,诸如摄像机模型和投影矩阵,基础矩阵,单应矩阵,极点,FOE（Focus Of Expansion）等.还对基于摄像机纯旋转的标定、基于摄像机三正交平移运动的标定、基于多次摄像机平面正交运动的标定、基于无穷远平面单应矩阵的标定以及基于射影重建的标定进行了评述并给出了结论.
文摘针对成捆原木自动化检尺中原木端面径级检测的关键问题,采用双目立体视觉及图像分割的原理,完成原木径级的快速三维测量.根据原木的直方图特征,提出基于最大熵阈值分割的区域标识算法,设定动态阈值,实现对原木端面与背景的精确分割.将提取的左右图像中原木端面边缘,借助ORB(Oriented FAST and Rotated BRIEF)特征点检测方法,与极线几何理论相结合完成原木边缘的快速立体匹配,得到三维坐标.此外以成捆原木为检测对象,进行原木边缘图像的最小二乘法椭圆拟合,确定原木端面长、短径参数.实验结果表明:该算法能够在10s内完成原木径级的检测,测量误差在2mm内.
