A new large-scale three-dimensional(3D) reconstruction technology based on integral imaging with color-position characteristics is presented.The color of the object point is similar to those of corresponding points.Th...A new large-scale three-dimensional(3D) reconstruction technology based on integral imaging with color-position characteristics is presented.The color of the object point is similar to those of corresponding points.The corresponding point coordinates form arithmetic progressions because integral imaging captures information with a senior array which has similar pitches on x and y directions.This regular relationship is used to determine the corresponding point parameters for reconstructing 3D information from divided elemental images separated by color,which contain several corresponding points.The feasibility of the proposed method is demonstrated through an optical indoor experiment.A large-scale application of the proposed method is illustrated by the experiment with a corner of our school as its object.展开更多
In order to get the entire data in the optical measurement, a multi-view three-dimensional(3D) measurement method based on turntable is proposed. In the method, a turntable is used to rotate the object and obtain mult...In order to get the entire data in the optical measurement, a multi-view three-dimensional(3D) measurement method based on turntable is proposed. In the method, a turntable is used to rotate the object and obtain multi-view point cloud data, and then multi-view point cloud data are registered and integrated into a 3D model. The measurement results are compared with that of the sticking marked point method. Experimental results show that the measurement process of the proposed method is simpler, and the scanning speed and accuracy are improved.展开更多
Photomechanical crystals,capable of transforming light energy into mechanical work,hold significant promise for applications in intelligent actuating devices,artificial muscles,and microrobots,but this calls for more ...Photomechanical crystals,capable of transforming light energy into mechanical work,hold significant promise for applications in intelligent actuating devices,artificial muscles,and microrobots,but this calls for more research on the influence of irradiation wavelengths.Here we report a discrete Cd(II)-based complex[Cd_(2)(CH_(2)OH-1,3-bpeb)_(4)(3,5-FBA)_(4)](1;CH_(2)OH-1,3-bpeb=5-hydroxymethyl-1,3-bis((E)-2-(pyridin-4-yl)vinyl)benzene,3,5-FBA=3,5-difluorobenzoate)which undergoes stepwise[2+2]photocycloaddition reactions under visible and ultraviolet light,forming mono-and di-cyclobutane products,respectively,through a single-crystal-to-singlecrystal transformation.This wavelength-controlled process involved the cleavage and subsequent reconstruction of Cd–O bonds within the crystal framework,along with the corresponding lattice contraction and expansion.Those photochemical reactions at different wavelengths initiate various crystal motions,which stem from the stress within the unit cell caused by anisotropic contraction/expansion.This work opens a new avenue for regulating wavelengths to achieve photocontrolled structural transformations and macroscopic photomechanical motions of molecular crystals.展开更多
In this Letter, we propose an elemental image regeneration method of three-dimensional（3D） integral imaging for occluded objects using a plenoptic camera. In conventional occlusion removal techniques, the informatio...In this Letter, we propose an elemental image regeneration method of three-dimensional（3D） integral imaging for occluded objects using a plenoptic camera. In conventional occlusion removal techniques, the information of the occlusion layers may be lost. Thus, elemental images have cracked parts, so the visual quality of the reconstructed 3D image is degraded. However, these cracked parts can be interpolated from adjacent elemental images. Therefore, in this Letter, we try to improve the visual quality of reconstructed 3D images by interpolating and regenerating virtual elemental images with adjacent elemental images after removing the occlusion layers. To prove our proposed method, we carry out optical experiments and calculate performance metrics such as the mean square error（MSE） and the peak signal-to-noise ratio（PSNR）.展开更多
基金supported by the National Natural Science Foundation of China(No.11474169)
文摘A new large-scale three-dimensional(3D) reconstruction technology based on integral imaging with color-position characteristics is presented.The color of the object point is similar to those of corresponding points.The corresponding point coordinates form arithmetic progressions because integral imaging captures information with a senior array which has similar pitches on x and y directions.This regular relationship is used to determine the corresponding point parameters for reconstructing 3D information from divided elemental images separated by color,which contain several corresponding points.The feasibility of the proposed method is demonstrated through an optical indoor experiment.A large-scale application of the proposed method is illustrated by the experiment with a corner of our school as its object.
基金supported by the National Natural Science Foundation of China(Nos.60808020 and 61078041)the Natural Science Foundation of Tianjin City(Nos.15JCYBJC51700 and 16JCYBJC15400)the National Science and Technology Support(No.2014BAH03F01)
文摘In order to get the entire data in the optical measurement, a multi-view three-dimensional(3D) measurement method based on turntable is proposed. In the method, a turntable is used to rotate the object and obtain multi-view point cloud data, and then multi-view point cloud data are registered and integrated into a 3D model. The measurement results are compared with that of the sticking marked point method. Experimental results show that the measurement process of the proposed method is simpler, and the scanning speed and accuracy are improved.
基金support from the National Natural Science Foundation of China(grant nos.U24A20507,22271203,and 22301204)the State Key Laboratory of Organometallic Chemistry of Shanghai Institute of Organic Chemistry(grant no.2024KF005)+2 种基金Open Research Fund of State Key Laboratory of Coordination Chemistry,School of Chemistry and Chemical Engineering,Nanjing University,Collaborative Innovation Centre of Suzhou Nano Science and Technology,the Priority Academic Program Development of Jiangsu Higher Education Institutions,the Project of Scientific and Technologic Infrastructure of Suzhou(grant no.SZS201905)Soochow University Starting Grant(grant no.NH10902124 to Q.L.)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(grant no.KYCX23_3232).
文摘Photomechanical crystals,capable of transforming light energy into mechanical work,hold significant promise for applications in intelligent actuating devices,artificial muscles,and microrobots,but this calls for more research on the influence of irradiation wavelengths.Here we report a discrete Cd(II)-based complex[Cd_(2)(CH_(2)OH-1,3-bpeb)_(4)(3,5-FBA)_(4)](1;CH_(2)OH-1,3-bpeb=5-hydroxymethyl-1,3-bis((E)-2-(pyridin-4-yl)vinyl)benzene,3,5-FBA=3,5-difluorobenzoate)which undergoes stepwise[2+2]photocycloaddition reactions under visible and ultraviolet light,forming mono-and di-cyclobutane products,respectively,through a single-crystal-to-singlecrystal transformation.This wavelength-controlled process involved the cleavage and subsequent reconstruction of Cd–O bonds within the crystal framework,along with the corresponding lattice contraction and expansion.Those photochemical reactions at different wavelengths initiate various crystal motions,which stem from the stress within the unit cell caused by anisotropic contraction/expansion.This work opens a new avenue for regulating wavelengths to achieve photocontrolled structural transformations and macroscopic photomechanical motions of molecular crystals.
基金supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.NRF-2015R1A2A1A16074936)
文摘In this Letter, we propose an elemental image regeneration method of three-dimensional（3D） integral imaging for occluded objects using a plenoptic camera. In conventional occlusion removal techniques, the information of the occlusion layers may be lost. Thus, elemental images have cracked parts, so the visual quality of the reconstructed 3D image is degraded. However, these cracked parts can be interpolated from adjacent elemental images. Therefore, in this Letter, we try to improve the visual quality of reconstructed 3D images by interpolating and regenerating virtual elemental images with adjacent elemental images after removing the occlusion layers. To prove our proposed method, we carry out optical experiments and calculate performance metrics such as the mean square error（MSE） and the peak signal-to-noise ratio（PSNR）.
