The Experts below are selected from a list of 17724 Experts worldwide ranked by ideXlab platform
Koji Nakamae - One of the best experts on this subject based on the ideXlab platform.
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Temporally- and Spatially-Resolved Observations of Current Filament Dynamics in Insulated Gate Bipolar Transistor Chip During Avalanche Breakdown
IEEE Transactions on Device and Materials Reliability, 2019Co-Authors: Koichi Endo, Koji NakamaeAbstract:Two-dimensional imaging of the dynamics of current filaments generated in Insulated Gate Bipolar Transistor (IGBT) chip at room temperature during avalanche breakdown has been performed. The Images were Obtained by using the Hamamatsu TriPHEMOS equipped with the micro-channel plate (MCP) sensor. The equipment can operate in single photon counting mode. From Obtained Image series, at the beginning of the avalanche breakdown, the emission intensity at the corners in the edge termination region of the IGBT was found to be high. The pixels with high emission intensity of these corners moved to the center of the four sides of the IGBT shape in the latter half of the avalanche breakdown period. Assuming that these pixels with high emission intensity are attributable to the current filament, it shows that the current filaments are moving at a speed of about 0.9 mm/μs.
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Temporally- and Spatially-Resolved Observations of Current Filament Dynamics in Insulated Gate Bipolar Transistor Chip During Avalanche Breakdown
IEEE Transactions on Device and Materials Reliability, 2019Co-Authors: Koichi Endo, Koji NakamaeAbstract:Two-dimensional imaging of the dynamics of current filaments generated in Insulated Gate Bipolar Transistor (IGBT) chip at room temperature during avalanche breakdown has been performed. The Images were Obtained by using the Hamamatsu TriPHEMOS equipped with the micro-channel plate (MCP) sensor. The equipment can operate in single photon counting mode. From Obtained Image series, at the beginning of the avalanche breakdown, the emission intensity at the corners in the edge termination region of the IGBT was found to be high. The pixels with high emission intensity of these corners moved to the center of the four sides of the IGBT shape in the latter half of the avalanche breakdown period. Assuming that these pixels with high emission intensity are attributable to the current filament, it shows that the current filaments are moving at a speed of about 0.9 mm/ $\mu \text{s}$ .
P. Ridao - One of the best experts on this subject based on the ideXlab platform.
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Correction of shading effects in vision-based UUV localization
2003 IEEE International Conference on Robotics and Automation (Cat. No.03CH37422), 2003Co-Authors: R. Garcia, X. Cufi, M. Carreras, P. RidaoAbstract:This paper describes the improvements achieved in our mosaicking system to assist unmanned underwater vehicle navigation. A major advance has been attained in the processing of Images of the ocean floor when light absorption effects are evident. Due to the absorption of natural light, underwater vehicles often require artificial light sources attached to them to provide the adequate illumination for processing underwater Images. Unfortunately, these flashlights tend to illuminate the scene in a nonuniform fashion. In this paper a technique to correct non-uniform lighting is proposed. The acquired frames are compensated through a point-by-point division of the Image by an estimation of the illumination field. Then, the gray-levels of the Obtained Image remapped to enhance Image contrast. Experiments with real Images are presented.
Daoxian Wang - One of the best experts on this subject based on the ideXlab platform.
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A semifragile watermark scheme for Image authentication
Multimedia Modelling Conference …, 2004Co-Authors: Xiang Zhou, Xiaohui Duan, Daoxian WangAbstract:In this paper, a novel semi-fragile watermarking scheme for Image authentication is proposed, which addresses the issue of protecting Images from illegal manipulations and modifications. The scheme extracts a signature (watermark) from the original Image and inserts this signature back into the Image, avoiding additional signature files. The error correction coding (ECC) is used to encode the signatures that are extracted from the Image. To increase the security of this scheme, user's private key is employed for encryption and decryption of the watermark during watermark extraction and insertion procedures. Experimental result shows that if there is no change in the Obtained Image, the watermark will be correctly extracted, thus will pass through the authentication system. This scheme is tolerant of lossy compression such as JPEG, but malicious changes of the Image will result in the breach of the watermark detection. In addition, this scheme can detect the exact locations, which are illegal modified blocks.
Michael Pätzold - One of the best experts on this subject based on the ideXlab platform.
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Free-space detection with fish-eye cameras
2017 IEEE Intelligent Vehicles Symposium (IV), 2017Co-Authors: Simon Hänisch, Rubén Heras Evangelio, Hadj Hamma Tadjine, Michael PätzoldAbstract:Advance Driver Assistance Systems (ADAS) have gained huge attention in the last decades. One of the fundamental steps of the video processing chain is the detection of areas where the car can drive through, i.e. free-space. In this paper we present an approach for the detection of free-space which is based on Image segmentation and classification of the Obtained Image segments. For the Image segmentation step we use several state-of-the-art approaches. The classification is done by a random-forest classifier trained to label the Image segments with one of three geometric classes (ground, sky, vertical) based on spatial, color and shape features. Segments labelled as ground are used to detect the free-space area in front of the car. Furthermore, a comparison of the results Obtained by using different segmentation approaches is provided.
Koichi Endo - One of the best experts on this subject based on the ideXlab platform.
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Temporally- and Spatially-Resolved Observations of Current Filament Dynamics in Insulated Gate Bipolar Transistor Chip During Avalanche Breakdown
IEEE Transactions on Device and Materials Reliability, 2019Co-Authors: Koichi Endo, Koji NakamaeAbstract:Two-dimensional imaging of the dynamics of current filaments generated in Insulated Gate Bipolar Transistor (IGBT) chip at room temperature during avalanche breakdown has been performed. The Images were Obtained by using the Hamamatsu TriPHEMOS equipped with the micro-channel plate (MCP) sensor. The equipment can operate in single photon counting mode. From Obtained Image series, at the beginning of the avalanche breakdown, the emission intensity at the corners in the edge termination region of the IGBT was found to be high. The pixels with high emission intensity of these corners moved to the center of the four sides of the IGBT shape in the latter half of the avalanche breakdown period. Assuming that these pixels with high emission intensity are attributable to the current filament, it shows that the current filaments are moving at a speed of about 0.9 mm/μs.
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Temporally- and Spatially-Resolved Observations of Current Filament Dynamics in Insulated Gate Bipolar Transistor Chip During Avalanche Breakdown
IEEE Transactions on Device and Materials Reliability, 2019Co-Authors: Koichi Endo, Koji NakamaeAbstract:Two-dimensional imaging of the dynamics of current filaments generated in Insulated Gate Bipolar Transistor (IGBT) chip at room temperature during avalanche breakdown has been performed. The Images were Obtained by using the Hamamatsu TriPHEMOS equipped with the micro-channel plate (MCP) sensor. The equipment can operate in single photon counting mode. From Obtained Image series, at the beginning of the avalanche breakdown, the emission intensity at the corners in the edge termination region of the IGBT was found to be high. The pixels with high emission intensity of these corners moved to the center of the four sides of the IGBT shape in the latter half of the avalanche breakdown period. Assuming that these pixels with high emission intensity are attributable to the current filament, it shows that the current filaments are moving at a speed of about 0.9 mm/ $\mu \text{s}$ .
