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对光度分析法准确度讨论的一点看法
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作者 何琼 《曲靖师范学院学报》 1995年第5期61-62,共2页
本文通过对可见分光光度分析法中光度测量误差对测定结果准确度影响的定量处理,说明可见光度分析法测定结果的准确度不可能达到容量分析结果的准确程度.
关键词 可见分光光度分析法 准确度 光度测量误差
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移动机器人中单目视觉里程计的研究 被引量:3
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作者 池鹏可 苏成悦 《广东工业大学学报》 CAS 2017年第5期40-44,共5页
将特征法与直接法相结合用于实现移动机器人的单目视觉里程计.采用Shi-Tomasi检测算法确保FAST检测算法提取的特征点的稳定性,通过四叉树算法使特征点分布均匀,并使用金字塔KLT算法跟踪下一帧图像的特征点.通过归一化直接线性变换DLT算... 将特征法与直接法相结合用于实现移动机器人的单目视觉里程计.采用Shi-Tomasi检测算法确保FAST检测算法提取的特征点的稳定性,通过四叉树算法使特征点分布均匀,并使用金字塔KLT算法跟踪下一帧图像的特征点.通过归一化直接线性变换DLT算法计算的单应矩阵重构相关位姿,利用最小化光度测量误差方法对特征点图像块进行直接匹配来估计移动机器人的运动位姿,并利用g2o库优化局部连续的运动位姿信息,提高运动估计的鲁棒性.通过Turtle Bot移动机器人在室内环境下进行了实验验证,利用KITTI数据集测试本文设计的单目视觉里程计,实验结果表明本文所提方法的有效性和实用性. 展开更多
关键词 直接法 单目视觉里程计 四叉树 单应矩阵 光度测量误差
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An orientation method and analysis of optical radiation sources based on polyhedron and parallel incident light 被引量:1
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作者 WANG Jiang 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第2期475-483,共9页
The spatial orientation of optical radiation sources has long been the hot topic in the aerospace and the military applications.Current researches mainly focus on the high precision orientation on the partial field of... The spatial orientation of optical radiation sources has long been the hot topic in the aerospace and the military applications.Current researches mainly focus on the high precision orientation on the partial field of view.Thus,combination of several partial fields of view is required to achieve orientation when the field of view exceeds 180°,which results in the increase of size,weight,power consumption and the cost.By defining radiation energy and direction of the optical radiation source as a vector and applying the cosine law of radiation and vector theorem,it is shown that the vector can be obtained from unit normal vectors on the three un-coplanar surfaces and from the energy projected by the optical radiation source.Based on this,an orientation method with 360° full field of view by a polyhedron is suggested,the mathematical formula for anti-multipath interference is supposed and the error upper limit is derived.The feasibility and effectiveness of this method are validated by measurements and simulation.An accuracy better than 2.866° and 0.574° is achieved when the ratio of measurement error of energy on arbitrary surface and the true value are 5% and 1%,respectively,given the matrix composed of unit normal vectors on three measurement surfaces is orthogonal. 展开更多
关键词 optical radiation sources orientation radiation energy unit normal vector POLYHEDRON
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A correction method of color projection fringes in 3D contour measurement 被引量:4
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作者 宋丽梅 李宗艳 +3 位作者 陈昌曼 习江涛 郭庆华 李晓捷 《Optoelectronics Letters》 EI 2015年第4期303-306,共4页
In the three-dimensional(3D) contour measurement,the phase shift profilometry(PSP) method is the most widely used one.However,the measurement speed of PSP is very low because of the multiple projections.In order to im... In the three-dimensional(3D) contour measurement,the phase shift profilometry(PSP) method is the most widely used one.However,the measurement speed of PSP is very low because of the multiple projections.In order to improve the measurement speed,color grating stripes are used for measurement in this paper.During the measurement,only one color sinusoidal fringe is projected on the measured object.Therefore,the measurement speed is greatly improved.Since there is coupling or interference phenomenon between the adjacent color grating stripes,a color correction method is used to improve the measurement results.A method for correcting nonlinear error of measurement system is proposed in this paper,and the sinusoidal property of acquired image after correction is better than that before correction.Experimental results show that with these correction methods,the measurement errors can be reduced.Therefore,it can support a good foundation for the high-precision 3D reconstruction. 展开更多
关键词 correction contour projection grating correcting projected pixel sinusoidal fringe Tianjin
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