为了实现对线性空间不变的模糊图像的盲复原,提出了一种基于稀疏性和平滑特性的多正则化约束的模糊图像盲复原方法.首先,根据自然图像边缘的稀疏特性,运用了一种权重的全变差范数(weighted total variation norm,简称WTV-norm)对复原图...为了实现对线性空间不变的模糊图像的盲复原,提出了一种基于稀疏性和平滑特性的多正则化约束的模糊图像盲复原方法.首先,根据自然图像边缘的稀疏特性,运用了一种权重的全变差范数(weighted total variation norm,简称WTV-norm)对复原图像进行正则化约束;然后,从运动模糊的点扩散函数(motion point spread function,简称MPSF)的特性出发,提出一种能够适用于多种模糊情况的多正则化约束;最后,提出了一种改进的变量分裂(modified variable splitting,简称MVS)方法来得到清晰的复原图像,同时准确地估计出相应的模糊退化函数.大量的实验结果表明,该方法能够较好地复原多种不同类型的模糊(例如运动模糊、高斯模糊、均匀模糊、圆盘模糊).与近几年提出来的一些具有代表性的模糊图像盲复原方法相比,该方法不仅主观的视觉效果得到了较为明显的改进,而且客观的信噪比增量也增加了1.20dB^4.22dB.展开更多
A motion parameter optimization method based on the objective of minimizing the total energy consumption in segment positioning was proposed for segment erector of shield tunneling machine. The segment positioning pro...A motion parameter optimization method based on the objective of minimizing the total energy consumption in segment positioning was proposed for segment erector of shield tunneling machine. The segment positioning process was decomposed into rotation, lifting and sliding actions in deriving the energy calculation model of segment erection. The work of gravity was taken into account in the mathematical modeling of energy consumed by each actuator. In order to investigate the relationship between the work done by the actuator and the path moved along by the segment, the upward and downward directions as well as the operating quadrant of the segment erector were defined. Piecewise nonlinear function of energy was presented, of which the result is determined by closely coupled components as working parameters and some intermediate variables. Finally, the effectiveness of the optimization method was proved by conducting a case study with a segment erector for the tunnel with a diameter of 3 m and drawing comparisons between different assembling paths. The results show that the energy required by assembling a ring of segments along the optimized moving path can be reduced up to 5%. The method proposed in this work definitely provides an effective energy saving solution for shield tunneling machine.展开更多
文摘为了实现对线性空间不变的模糊图像的盲复原,提出了一种基于稀疏性和平滑特性的多正则化约束的模糊图像盲复原方法.首先,根据自然图像边缘的稀疏特性,运用了一种权重的全变差范数(weighted total variation norm,简称WTV-norm)对复原图像进行正则化约束;然后,从运动模糊的点扩散函数(motion point spread function,简称MPSF)的特性出发,提出一种能够适用于多种模糊情况的多正则化约束;最后,提出了一种改进的变量分裂(modified variable splitting,简称MVS)方法来得到清晰的复原图像,同时准确地估计出相应的模糊退化函数.大量的实验结果表明,该方法能够较好地复原多种不同类型的模糊(例如运动模糊、高斯模糊、均匀模糊、圆盘模糊).与近几年提出来的一些具有代表性的模糊图像盲复原方法相比,该方法不仅主观的视觉效果得到了较为明显的改进,而且客观的信噪比增量也增加了1.20dB^4.22dB.
基金Project(51305328)supported by the National Natural Science Foundation of ChinaProject(2012AA041803)supported by the NationalHigh Technology R&D Program of China+1 种基金Project(GZKF-201210)supported by the Open Fund of State Key Laboratory of Fluid Power Transmission and Control of Zhejiang University,ChinaProject(2013M532031)supported by the China Postdoctoral Science Foundation
文摘A motion parameter optimization method based on the objective of minimizing the total energy consumption in segment positioning was proposed for segment erector of shield tunneling machine. The segment positioning process was decomposed into rotation, lifting and sliding actions in deriving the energy calculation model of segment erection. The work of gravity was taken into account in the mathematical modeling of energy consumed by each actuator. In order to investigate the relationship between the work done by the actuator and the path moved along by the segment, the upward and downward directions as well as the operating quadrant of the segment erector were defined. Piecewise nonlinear function of energy was presented, of which the result is determined by closely coupled components as working parameters and some intermediate variables. Finally, the effectiveness of the optimization method was proved by conducting a case study with a segment erector for the tunnel with a diameter of 3 m and drawing comparisons between different assembling paths. The results show that the energy required by assembling a ring of segments along the optimized moving path can be reduced up to 5%. The method proposed in this work definitely provides an effective energy saving solution for shield tunneling machine.
