The Experts below are selected from a list of 9534 Experts worldwide ranked by ideXlab platform
Masatoshi Ishikawa - One of the best experts on this subject based on the ideXlab platform.
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high speed Motion Blur compensation system in infrared region using galvanometer mirror and thermography camera
Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems 2020, 2020Co-Authors: Y Kubota, Tomohiko Hayakawa, Yushi Moko, Masatoshi IshikawaAbstract:The infrared thermography method has been used as a non-contact and quick diagnostic technique for the measurement of deformation inside concrete structures. Measurement from the in-vehicle camera is indispensable for quick diagnosis, yet Motion Blur while running is the essential problem. In this study, we developed a system using the galvanometer mirror and the thermography camera for compensating this Motion Blur. In the indoor and outdoor experiment assuming the measurement at 40 km/h, it was confirmed that our system compensated the Motion Blur effectively in the infrared region and detected the delamination of concrete structures.
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real time high speed Motion Blur compensation method using galvanometer mirror for shape sensing of microfabricated objects
Optics Photonics and Digital Technologies for Imaging Applications V, 2018Co-Authors: Kenichi Murakami, Tomohiko Hayakawa, Jerome De Leon, Masatoshi IshikawaAbstract:In this paper, Motion-Blur compensation method for micro fabricated objects using a galvanometer mirror with back-and-forth rotation is proposed. Motion-Blur compensation is expected to extend exposure time without Motion Blur because longer exposure time can decrease the intensity of illumination to avoid shape expansion of a target object by heat of illumination. Dealing with this demand, a galvanometer mirror is installed between the target and a 2D high-speed camera, and controls the optical axis of the camera to follow the moving target. Each continuous images are taken during the Motion of the stage, and finally taken images are integrated into one image by patching for detecting fabrication error using image processing. The experimental system that consists of a high-speed camera, a galvanometer mirror and a high-precision stage is developed and a 20mm=/s moving drilled silicon nitride sheet having holes of about 40 μm in diameter are lattice-shaped at a pitch of 60 μm is captured without Motion Blur by using this system. Comparing captured images with still images in diameter, roundness and curvature of the each holes, the effectiveness of this system is validated.
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Gain-compensated sinusoidal scanning of a galvanometer mirror in proportional-integral-differential control using the pre-emphasis technique for Motion-Blur compensation
Applied optics, 2016Co-Authors: Tomohiko Hayakawa, Takanoshin Watanabe, Taku Senoo, Masatoshi IshikawaAbstract:We propose a method to achieve precise sine-wave path tracking for real-time Motion-Blur compensation to extend the corresponding frequency spectrum in proportional-integral-differential (PID) control by using a pre-emphasis technique. We calculate pre-emphasis coefficients in advance to follow a sine wave with a gain of 0 dB and multiply the input signal by these pre-emphasis coefficients. In experiments, we were thus able to extend the greatest frequency from 100 to 500 Hz and achieve gain improvement of approximately 3 dB at 400 and 500 Hz. For the application of inspection, we confirmed that Motion Blur is significantly reduced when the system operates at high frequency, and we achieved a responsiveness 3.3 times higher than that of our previous system.
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real time high speed Motion Blur compensation system based on back and forth Motion control of galvanometer mirror
Optics Express, 2015Co-Authors: Tomohiko Hayakawa, Takanoshin Watanabe, Masatoshi IshikawaAbstract:We developed a novel real-time Motion Blur compensation system for the Blur caused by high-speed one-dimensional Motion between a camera and a target. The system consists of a galvanometer mirror and a high-speed color camera, without the need for any additional sensors. We controlled the galvanometer mirror with continuous back-and-forth oscillating Motion synchronized to a high-speed camera. The angular speed of the mirror is given in real time within 10 ms based on the concept of background tracking and rapid raw Bayer block matching. Experiments demonstrated that our system captures Motion-invariant images of objects moving at speeds up to 30 km/h.
Tomohiko Hayakawa - One of the best experts on this subject based on the ideXlab platform.
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high speed Motion Blur compensation system in infrared region using galvanometer mirror and thermography camera
Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems 2020, 2020Co-Authors: Y Kubota, Tomohiko Hayakawa, Yushi Moko, Masatoshi IshikawaAbstract:The infrared thermography method has been used as a non-contact and quick diagnostic technique for the measurement of deformation inside concrete structures. Measurement from the in-vehicle camera is indispensable for quick diagnosis, yet Motion Blur while running is the essential problem. In this study, we developed a system using the galvanometer mirror and the thermography camera for compensating this Motion Blur. In the indoor and outdoor experiment assuming the measurement at 40 km/h, it was confirmed that our system compensated the Motion Blur effectively in the infrared region and detected the delamination of concrete structures.
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real time high speed Motion Blur compensation method using galvanometer mirror for shape sensing of microfabricated objects
Optics Photonics and Digital Technologies for Imaging Applications V, 2018Co-Authors: Kenichi Murakami, Tomohiko Hayakawa, Jerome De Leon, Masatoshi IshikawaAbstract:In this paper, Motion-Blur compensation method for micro fabricated objects using a galvanometer mirror with back-and-forth rotation is proposed. Motion-Blur compensation is expected to extend exposure time without Motion Blur because longer exposure time can decrease the intensity of illumination to avoid shape expansion of a target object by heat of illumination. Dealing with this demand, a galvanometer mirror is installed between the target and a 2D high-speed camera, and controls the optical axis of the camera to follow the moving target. Each continuous images are taken during the Motion of the stage, and finally taken images are integrated into one image by patching for detecting fabrication error using image processing. The experimental system that consists of a high-speed camera, a galvanometer mirror and a high-precision stage is developed and a 20mm=/s moving drilled silicon nitride sheet having holes of about 40 μm in diameter are lattice-shaped at a pitch of 60 μm is captured without Motion Blur by using this system. Comparing captured images with still images in diameter, roundness and curvature of the each holes, the effectiveness of this system is validated.
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Gain-compensated sinusoidal scanning of a galvanometer mirror in proportional-integral-differential control using the pre-emphasis technique for Motion-Blur compensation
Applied optics, 2016Co-Authors: Tomohiko Hayakawa, Takanoshin Watanabe, Taku Senoo, Masatoshi IshikawaAbstract:We propose a method to achieve precise sine-wave path tracking for real-time Motion-Blur compensation to extend the corresponding frequency spectrum in proportional-integral-differential (PID) control by using a pre-emphasis technique. We calculate pre-emphasis coefficients in advance to follow a sine wave with a gain of 0 dB and multiply the input signal by these pre-emphasis coefficients. In experiments, we were thus able to extend the greatest frequency from 100 to 500 Hz and achieve gain improvement of approximately 3 dB at 400 and 500 Hz. For the application of inspection, we confirmed that Motion Blur is significantly reduced when the system operates at high frequency, and we achieved a responsiveness 3.3 times higher than that of our previous system.
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real time high speed Motion Blur compensation system based on back and forth Motion control of galvanometer mirror
Optics Express, 2015Co-Authors: Tomohiko Hayakawa, Takanoshin Watanabe, Masatoshi IshikawaAbstract:We developed a novel real-time Motion Blur compensation system for the Blur caused by high-speed one-dimensional Motion between a camera and a target. The system consists of a galvanometer mirror and a high-speed color camera, without the need for any additional sensors. We controlled the galvanometer mirror with continuous back-and-forth oscillating Motion synchronized to a high-speed camera. The angular speed of the mirror is given in real time within 10 ms based on the concept of background tracking and rapid raw Bayer block matching. Experiments demonstrated that our system captures Motion-invariant images of objects moving at speeds up to 30 km/h.
Peter Hogg - One of the best experts on this subject based on the ideXlab platform.
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the impact of simulated Motion Blur on lesion detection performance in full field digital mammography
British Journal of Radiology, 2017Co-Authors: Ahmed Abdullah, Judith Kelly, John D Thompson, Claire Mercer, Rob Aspin, Peter HoggAbstract:Objective:Motion Blur is a known phenomenon in full-field digital mammography, but the impact on lesion detection is unknown. This is the first study to investigate detection performance with varying magnitudes of simulated Motion Blur.Methods:7 observers (15 ± 5 years' reporting experience) evaluated 248 cases (62 containing malignant masses, 62 containing malignant microcalcifications and 124 normal cases) for 3 conditions: no Blurring (0 mm) and 2 magnitudes of simulated Blurring (0.7 and 1.5 mm). Abnormal cases were biopsy proven. Mathematical simulation was used to provide a pixel shift in order to simulate Motion Blur. A free-response observer study was conducted to compare lesion detection performance for the three conditions. The equally weighted jackknife alternative free-response receiver operating characteristic was used as the figure of merit. Test alpha was set at 0.05 to control probability of Type I error.Results:The equally weighted jackknife alternative free-response receiver operating ch...
Ahmed Abdullah - One of the best experts on this subject based on the ideXlab platform.
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the impact of simulated Motion Blur on lesion detection performance in full field digital mammography
British Journal of Radiology, 2017Co-Authors: Ahmed Abdullah, Judith Kelly, John D Thompson, Claire Mercer, Rob Aspin, Peter HoggAbstract:Objective:Motion Blur is a known phenomenon in full-field digital mammography, but the impact on lesion detection is unknown. This is the first study to investigate detection performance with varying magnitudes of simulated Motion Blur.Methods:7 observers (15 ± 5 years' reporting experience) evaluated 248 cases (62 containing malignant masses, 62 containing malignant microcalcifications and 124 normal cases) for 3 conditions: no Blurring (0 mm) and 2 magnitudes of simulated Blurring (0.7 and 1.5 mm). Abnormal cases were biopsy proven. Mathematical simulation was used to provide a pixel shift in order to simulate Motion Blur. A free-response observer study was conducted to compare lesion detection performance for the three conditions. The equally weighted jackknife alternative free-response receiver operating characteristic was used as the figure of merit. Test alpha was set at 0.05 to control probability of Type I error.Results:The equally weighted jackknife alternative free-response receiver operating ch...
Takanoshin Watanabe - One of the best experts on this subject based on the ideXlab platform.
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Gain-compensated sinusoidal scanning of a galvanometer mirror in proportional-integral-differential control using the pre-emphasis technique for Motion-Blur compensation
Applied optics, 2016Co-Authors: Tomohiko Hayakawa, Takanoshin Watanabe, Taku Senoo, Masatoshi IshikawaAbstract:We propose a method to achieve precise sine-wave path tracking for real-time Motion-Blur compensation to extend the corresponding frequency spectrum in proportional-integral-differential (PID) control by using a pre-emphasis technique. We calculate pre-emphasis coefficients in advance to follow a sine wave with a gain of 0 dB and multiply the input signal by these pre-emphasis coefficients. In experiments, we were thus able to extend the greatest frequency from 100 to 500 Hz and achieve gain improvement of approximately 3 dB at 400 and 500 Hz. For the application of inspection, we confirmed that Motion Blur is significantly reduced when the system operates at high frequency, and we achieved a responsiveness 3.3 times higher than that of our previous system.
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real time high speed Motion Blur compensation system based on back and forth Motion control of galvanometer mirror
Optics Express, 2015Co-Authors: Tomohiko Hayakawa, Takanoshin Watanabe, Masatoshi IshikawaAbstract:We developed a novel real-time Motion Blur compensation system for the Blur caused by high-speed one-dimensional Motion between a camera and a target. The system consists of a galvanometer mirror and a high-speed color camera, without the need for any additional sensors. We controlled the galvanometer mirror with continuous back-and-forth oscillating Motion synchronized to a high-speed camera. The angular speed of the mirror is given in real time within 10 ms based on the concept of background tracking and rapid raw Bayer block matching. Experiments demonstrated that our system captures Motion-invariant images of objects moving at speeds up to 30 km/h.
