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A Hand Gesture Based Interactive Presentation System Utilizing Heterogeneous cameras

Tsinghua Science and Technology 2012年第3期17卷 329-336页

作者： Bobo Zeng Guijin Wang Xinggang Lin Department of Electronic Engineering Tsinghua UniversityBeijing 100084China

In this paper, a real-time system that utilizes hand gestures to interactively control the presentation is proposed. The system employs a thermal camera for robust human body segmentation to handle the complex background and varying illumination posed by the projector. A fast and robust hand localization al- gorithm is proposed, with which the head, torso, and arm are sequentially localized. Hand trajectories are segmented and recognized as gestures for interactions. A dual-step calibration algorithm is utilized to map the interaction regions between the thermal camera and the projected contents by integrating a Web cam- era. Experiments show that the system has a high recognition rate for hand gestures, and corresponding interactions can be performed correctly.

关键词： hand gesture detection gesture recognition thermal camera interactive presentation

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On the Development of a Simple and Portable Ground-Based Infrared Imaging System for Lunar and Atmospheric Studies

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International Journal of Astronomy and Astrophysics 2021年第3期11卷 422-434页

作者： Abdullrahman Maghrabi Georg Dittié Abdulah Al-Dosari Mohammed Al-Mutiri Mohammed Al-Tlasi Abdulah Alshehri The National Center for Applied Physics King Abdulaziz City for Science and Technology Riydah KSA Dittié Thermografie K&ouml nigswinter Germany

A small, portable, infrared (wavelength of 7 - 14 μm) system has been designed and developed to study the thermal behavior of the lunar surface and for thermal remote sensing applications. The principal operation of the system depends on collecting large amounts of infrared light, using a modified Newtonian telescope. The light from the object is reflected by the primary mirror and the secondary mirror. This collected light is then focused into a thermal camera by using an intermediate germanium lens as a field lens to provide a real optical image on the camera sensor. Several observations have been obtained out using the developed system, and eliciting some interesting results. These include lunar observations during different phases and during partial lunar eclipse. The thermal behavior of the lunar surface was identified, proving the system’s functionality and performance. The developed system is, also, particularly suitable tool for outreach programs and students projects which can possibly offer useful learning and exploration opportunities for students in different applications. In this paper, a brief description about the developed system is provided. Some of the obtained results are illustrated. The future applications and improvements to the designed system are also summarized.

关键词： Infrared Optical-thermal System Moon Atmosphere Eclipse thermal camera Technology

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