We present the Fourier lightfield multiview stereoscope(FiLM-Scope).This imaging device combines concepts from Fourier lightfield microscopy and multiview stereo imaging to capture high-resolution 3D videos over large...We present the Fourier lightfield multiview stereoscope(FiLM-Scope).This imaging device combines concepts from Fourier lightfield microscopy and multiview stereo imaging to capture high-resolution 3D videos over large fields of view.The FiLM-Scope optical hardware consists of a multicamera array,with 48 individual microcameras,placed behind a high-throughput primary lens.This allows the FiLM-Scope to simultaneously capture 48 unique 12.8 megapixel images of a 28×37 mm field-of-view,from unique angular perspectives over a 21 deg×29 deg range,with down to 22μm lateral resolution.We also describe a self-supervised algorithm to reconstruct 3D height maps from these images.Our approach demonstrates height accuracy down to 11μm.To showcase the utility of our system,we perform tool tracking over the surface of an ex vivo rat skull and visualize the 3D deformation in stretching human skin,with videos captured at up to 100 frames per second.The FiLM-Scope has the potential to improve 3D visualization in a range of microsurgical settings.展开更多
It is essential to investigate the light field camera parameters for the accurate flame temperature measurement because the sampling characteristics of the flame radiation can be varied with them. In this study, novel...It is essential to investigate the light field camera parameters for the accurate flame temperature measurement because the sampling characteristics of the flame radiation can be varied with them. In this study, novel indices of the light field camera were proposed to investigate the directional and spatial sampling characteristics of the flame radiation. Effects of light field camera parameters such as focal length and magnification of the main lens, focal length and magnification of the microlens were investigated. It was observed that the sampling characteristics of the flame are varied with the different parameters of the light field camera. The optimized parameters of the light field camera were then proposed for the flame radiation sampling. The larger sampling angle(23 times larger) is achieved by the optimized parameters compared to the commercial light field camera parameters. A non-negative least square(NNLS) algorithm was used to reconstruct the flame temperature. The reconstruction accuracy was also evaluated by the optimized parameters. The results suggested that the optimized parameters can provide higher reconstruction accuracy for axisymmetric and non-symmetric flame conditions in comparison to the commercial light field camera.展开更多
Film buffs are regarding 2018 as a golden year for both Chinese cinema and Sino-African film cooperation. Released during the Spring Festival in 201& the Chinese antiterrorism action movie Operation Red Sea has gr...Film buffs are regarding 2018 as a golden year for both Chinese cinema and Sino-African film cooperation. Released during the Spring Festival in 201& the Chinese antiterrorism action movie Operation Red Sea has grossed more than $3.65 billion at the box office, becoming one of the most profitable Chinese films in histoiy. Many cinema goers don't know that most of the footage of the overseas evacuation sequence was filmed in Morocco. According to Dante Lam, Director of tlie film, the Moroccan army provided considerable support for the shooting of the film, supplying tanks, armored vehicles and helicopters to his team, with even the elite gendarmerie of the Royal Guard participating.展开更多
African film industry needs to reinvent itself and focus on indigenous culture to drive story lines IN June each year Cameroon’s capital Yaounde opens its arms to Africa’s movie elite,with the Ecrans Noirs(Black Scr...African film industry needs to reinvent itself and focus on indigenous culture to drive story lines IN June each year Cameroon’s capital Yaounde opens its arms to Africa’s movie elite,with the Ecrans Noirs(Black Screens),an international festival of film.The theme for 2011 was "African Cinema and Its Actors" and the event brought together a large number of film professionals, critics and other industry insiders.展开更多
针对目前基于深度学习的OCC(Optical Camera Communication)系统目标LED(Light Emitting Diode)阵列检测算法网络结构复杂、参数量大、计算复杂度高的问题,提出了一种基于Effeps-YOLOv11(Effeps-You Only Look Onceversion 11)的LED阵...针对目前基于深度学习的OCC(Optical Camera Communication)系统目标LED(Light Emitting Diode)阵列检测算法网络结构复杂、参数量大、计算复杂度高的问题,提出了一种基于Effeps-YOLOv11(Effeps-You Only Look Onceversion 11)的LED阵列检测算法。在Effeps-YOLOv11特征提取的主干网中采用轻量型EfficientNetV2网络平衡网络宽度、深度、图像分辨率;使用ECA(Efficient Channel Attention)注意力机制替换原有的复杂注意力模块,简化了网络结构;设计使用轻量级C3PC(C3 Part Convolution)模块,降低计算复杂度;采用Shape_IoU损失函数提高边界框的定位精度,提升LED阵列的定位准确性,为正确解码提供了先期保障。依托OCC系统实验平台实现数据的采集,建立完成训练所需数据集。实验结果表明,在室外复杂环境下该Effeps-YOLOv11算法能满足OCC系统目标LED阵列检测任务需求。展开更多
基金supported by the National Cancer Institute(NCI)of the National Institutes of Health(Grant No.R44CA250877)the Office of Research Infrastructure Programs(ORIP),Office of the Director,National Institutes of Health,and the National Institute of Environmental Health Sciences(NIEHS)of the National Institutes of Health(Grant No.R44OD024879)+2 种基金the National Institute of Biomedical Imaging and Bioengineering(NIBIB)of the National Institutes of Health(Grant No.R43EB030979)the National Science Foundation(Grant Nos.2036439 and 2238845)the Duke Coulter Translational Part-nership Award,the Fitzpatrick Institute at the Duke University.
文摘We present the Fourier lightfield multiview stereoscope(FiLM-Scope).This imaging device combines concepts from Fourier lightfield microscopy and multiview stereo imaging to capture high-resolution 3D videos over large fields of view.The FiLM-Scope optical hardware consists of a multicamera array,with 48 individual microcameras,placed behind a high-throughput primary lens.This allows the FiLM-Scope to simultaneously capture 48 unique 12.8 megapixel images of a 28×37 mm field-of-view,from unique angular perspectives over a 21 deg×29 deg range,with down to 22μm lateral resolution.We also describe a self-supervised algorithm to reconstruct 3D height maps from these images.Our approach demonstrates height accuracy down to 11μm.To showcase the utility of our system,we perform tool tracking over the surface of an ex vivo rat skull and visualize the 3D deformation in stretching human skin,with videos captured at up to 100 frames per second.The FiLM-Scope has the potential to improve 3D visualization in a range of microsurgical settings.
基金supported by the National Natural Science Foundation of China(Grant Nos.51676044 and 51327803)the Social Development Project of Jiangsu Province,China(Grant No.BE20187053)+1 种基金the Postgraduate Research and Practice Innovation Program of Jiangsu Province,China(Grant No.KYCX170081)China Scholarship Council
文摘It is essential to investigate the light field camera parameters for the accurate flame temperature measurement because the sampling characteristics of the flame radiation can be varied with them. In this study, novel indices of the light field camera were proposed to investigate the directional and spatial sampling characteristics of the flame radiation. Effects of light field camera parameters such as focal length and magnification of the main lens, focal length and magnification of the microlens were investigated. It was observed that the sampling characteristics of the flame are varied with the different parameters of the light field camera. The optimized parameters of the light field camera were then proposed for the flame radiation sampling. The larger sampling angle(23 times larger) is achieved by the optimized parameters compared to the commercial light field camera parameters. A non-negative least square(NNLS) algorithm was used to reconstruct the flame temperature. The reconstruction accuracy was also evaluated by the optimized parameters. The results suggested that the optimized parameters can provide higher reconstruction accuracy for axisymmetric and non-symmetric flame conditions in comparison to the commercial light field camera.
文摘Film buffs are regarding 2018 as a golden year for both Chinese cinema and Sino-African film cooperation. Released during the Spring Festival in 201& the Chinese antiterrorism action movie Operation Red Sea has grossed more than $3.65 billion at the box office, becoming one of the most profitable Chinese films in histoiy. Many cinema goers don't know that most of the footage of the overseas evacuation sequence was filmed in Morocco. According to Dante Lam, Director of tlie film, the Moroccan army provided considerable support for the shooting of the film, supplying tanks, armored vehicles and helicopters to his team, with even the elite gendarmerie of the Royal Guard participating.
文摘African film industry needs to reinvent itself and focus on indigenous culture to drive story lines IN June each year Cameroon’s capital Yaounde opens its arms to Africa’s movie elite,with the Ecrans Noirs(Black Screens),an international festival of film.The theme for 2011 was "African Cinema and Its Actors" and the event brought together a large number of film professionals, critics and other industry insiders.
文摘针对目前基于深度学习的OCC(Optical Camera Communication)系统目标LED(Light Emitting Diode)阵列检测算法网络结构复杂、参数量大、计算复杂度高的问题,提出了一种基于Effeps-YOLOv11(Effeps-You Only Look Onceversion 11)的LED阵列检测算法。在Effeps-YOLOv11特征提取的主干网中采用轻量型EfficientNetV2网络平衡网络宽度、深度、图像分辨率;使用ECA(Efficient Channel Attention)注意力机制替换原有的复杂注意力模块,简化了网络结构;设计使用轻量级C3PC(C3 Part Convolution)模块,降低计算复杂度;采用Shape_IoU损失函数提高边界框的定位精度,提升LED阵列的定位准确性,为正确解码提供了先期保障。依托OCC系统实验平台实现数据的采集,建立完成训练所需数据集。实验结果表明,在室外复杂环境下该Effeps-YOLOv11算法能满足OCC系统目标LED阵列检测任务需求。
