Synergic movement of finger's joints provides human hand tremendous dexterities,and the detection of kinematics parameters is critical to describe and evaluate the kinesiology functions of the fingers.The present ...Synergic movement of finger's joints provides human hand tremendous dexterities,and the detection of kinematics parameters is critical to describe and evaluate the kinesiology functions of the fingers.The present work is the attempt to investigate how the angular velocity and angular acceleration of the joints of index finger vary with respect to time during conducting a motor task.A high-speed video camera has been employed to visually record the movement of index finger,and miniaturized(5-mm diameter) reflective markers have affixed to the subject's index finger on the side close to thumb and dorsum of thumb at different joint landmarks.Captured images have been reviewed frame by frame to get the coordinate values of each joint,and the angular displacements,angular velocities and angular acceleration can be obtained with triangle function.The experiment results show that the methods here can detect the kinematics parameters of index finger joints during moving,and can be a valid route to study the motor function of index finger.展开更多
间接飞行时间(indirect time of flight,iTOF)相机在三维环境感知领域有着广泛的应用前景。根据iTOF相机成像原理,当曝光时间过大导致相机工作在非线性区时,解算的深度信息也会引入额外的偏差,从而影响测量准确度。为了进一步提高飞行...间接飞行时间(indirect time of flight,iTOF)相机在三维环境感知领域有着广泛的应用前景。根据iTOF相机成像原理,当曝光时间过大导致相机工作在非线性区时,解算的深度信息也会引入额外的偏差,从而影响测量准确度。为了进一步提高飞行时间相机的应用精度,根据飞行时间相机的光学成像机理,提出一种针对飞行时间相机的性能参数测量方法,通过实验和计算间接得到飞行时间深度相机的系统增益等性能参数,将其代入飞行时间相机的光学成像模型,即可得到距离与相机输出灰度值的对应曲线。建模与实验结果的相对误差可以达到20%以内,平均相对误差为0.16%。这些性能参数和仿真模型用于指导iTOF相机在不同场景使用时的积分时间选择,可以有效解决因使用不当引入非线性误差而降低距离测量精度的问题。展开更多
基金Supported by the National Natural Science Foundation of China (30770546 )Natural Science Foundation of Chongqing(2006BB2043,2007BB5148)
文摘Synergic movement of finger's joints provides human hand tremendous dexterities,and the detection of kinematics parameters is critical to describe and evaluate the kinesiology functions of the fingers.The present work is the attempt to investigate how the angular velocity and angular acceleration of the joints of index finger vary with respect to time during conducting a motor task.A high-speed video camera has been employed to visually record the movement of index finger,and miniaturized(5-mm diameter) reflective markers have affixed to the subject's index finger on the side close to thumb and dorsum of thumb at different joint landmarks.Captured images have been reviewed frame by frame to get the coordinate values of each joint,and the angular displacements,angular velocities and angular acceleration can be obtained with triangle function.The experiment results show that the methods here can detect the kinematics parameters of index finger joints during moving,and can be a valid route to study the motor function of index finger.
文摘间接飞行时间(indirect time of flight,iTOF)相机在三维环境感知领域有着广泛的应用前景。根据iTOF相机成像原理,当曝光时间过大导致相机工作在非线性区时,解算的深度信息也会引入额外的偏差,从而影响测量准确度。为了进一步提高飞行时间相机的应用精度,根据飞行时间相机的光学成像机理,提出一种针对飞行时间相机的性能参数测量方法,通过实验和计算间接得到飞行时间深度相机的系统增益等性能参数,将其代入飞行时间相机的光学成像模型,即可得到距离与相机输出灰度值的对应曲线。建模与实验结果的相对误差可以达到20%以内,平均相对误差为0.16%。这些性能参数和仿真模型用于指导iTOF相机在不同场景使用时的积分时间选择,可以有效解决因使用不当引入非线性误差而降低距离测量精度的问题。
