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With the popularization of small Unmanned Aerial Vehicles (UAVs) and their usage diversification among various fields, such as aerial mapping applications, it is important to develop better terrain following techniques that rely solely on the vehicle's sensing capabilities. The objective of this paper is to evaluate whether is possible to gather information about terrain inclination and elevation...
Novel scheme of polydimethylsiloxane-based optical system was proposed, and its measurement system combined with tablet type terminal has been demonstrated. Effective stray light reduction was observed in this scheme, and its mechanism have been studied. Scattering properties at the border between PDMS and carbon-doped PDMS was investigated, and discussed.
In this paper we present the setup including optics and components, the reconstruction scheme and performance measurements of the adaptive optics (AO) system implemented at the 26 cm transportable optical ground station (TAOGS) which is presently located at the Observatorio del Teide, Tenerife. The system is used to improve the signal-to-noise ratio of satellite to ground laser communications. It...
The purpose of this paper is to explore some existing techniques in vision-based registration for Augmented Reality (AR) and present them collectively. AR is a branch of computer vision which generally overlays Virtual Objects (VOs) on actual images of real-world scenes in order to provide additional information about the scene to the user. Due to its wide range of applications in the fields of medical,...
Omnidirectional stereo cameras have been proposed to be applied as a safety sensor in automated guided vehicles. As a part of the EC-funded PAN-Robots project, a custom designed high performance omnidirectional stereo camera with fisheye objectives was designed and manufactured. This paper shows the results of the optical and environmental tests which were done for the fisheye objectives and for the...
In this paper we present a novel algorithm for moving object detection in thermal images taken by a moving thermal camera. It allows a detection of moving objects in thermal images of low quality without imposing restrictions on the temperature and/or shape of the object. The main assumption required for good performance of the algorithm is that the transversal movement of the vehicle will not produce...
We developed an optical high-speed image rotation controller and realized a high-speed roll camera that is able to cancel the rotational motion blur of a rotating target. This system is composed of a hollow motor, a Dove prism, and a high-speed camera and controls optical image rotation according to the target rotation by using high-speed image processing. This so-called optical lever formed of the...
the paper addresses the experimental investigation of intensity scintillation for characterization of optical Low Earth Orbit-ground communications. In the framework of a former measurement campaign in 2006 and 2009, recordings of intensity scintillation were taken using a pupil plane camera. These recordings are analyzed and intensity scintillation index and correlation width are derived for seven...
In this paper, we present a novel approach in combining visual and inertial measurements in non-static environments for first order characterization of the metric motion of non-static objects in the scene. Our approach leverages online estimated ego motion states and uses a novel inertial-optical flow (IOF) measurement analysis to identify moving objects and to characterize them in their angular and...
We present our results on utilizing an SNSPD array and compressive imaging techniques to perform single photon imaging and present our progress toward a high-resolution single-photon camera for the mid-IR.
In this paper we consider the inspection of surface flaws in large aperture optical element. A high efficiency and precision instrument is proposed which contains two kinds of imaging systems. One is dark-field imaging system (DFIS) constructed by line scan camera with 10μm resolution. The other is bright-field imaging system (BFIS) constructed by microscope with 1μm resolution. Considering the small...
The effect of vignetting is undesirable in image processing and analysis. It cause fall-off of pixel intensity from centre towards edges of the image. In this paper, we propose a new procedure of fast vignetting reduction based on two images acquired with different camera/lens settings. The change of lens aperture or focal length will also change the effect of vignetting in images. These differences...
Given the recent progress in the development of computer vision, it is nowadays possible to optically track features of the human body with unprecedented precision. We take this as a starting point to build a novel human-machine interface for the disabled. In this particular work we explore the possibility of visually inspecting the human forearm to detect what fingers are moving, and to what extent...
Due to the direct line-of-sight constraint, surgical instrument optical tracking system (OTS) suffers occlusion problem caused by the equipments, staff members, or surgical instruments during the operation. To alleviate the burden of surgeons, we propose a robotic platform and an optimization based control methods to autonomously re-configure the optical tracker when the occlusion problem is about...
In this paper techniques for reliable orientation estimation on Android-based devices are investigated in the aspect of processing demand. In terms of reliability, an optical flow based sensor fusion method is proposed. With a well detailed measurement configuration, the results are shown in the aspect of processor load and different frame rate for both synchronous and asynchronous processing.
As reported in Nature journal, the super resolution gigapixel camera of Duke University was highlighted on June, 2012 from Wall Street Journal and mass media. According to the reports, Duke gigapixel camera system was developed with big grant for the purpose of military operation and surveillance under the supports of DARPA because of the needs of US military. And this gigapixel camera is expected...
This paper presents a new immersive VR interface bridging cyber and physical worlds for Cyber Physical System (CPS). Informationaly structured environment (ISE) has been proposed in service robotics so far. In ISE, environmental information such as positions of objects, furniture, humans, and robots is gathered by embedded sensor networks and stored in a database structurally. A service robot is able...
In the past years, the plenoptic camera aroused an increasing interest in the field of computer vision. Its capability of capturing three-dimensional image data is achieved by an array of micro lenses placed in front of a traditional image sensor. The acquired light field data allows for the reconstruction of photographs focused at different depths. Given the plenoptic camera parameters, the metric...
Mixed reality has been proposed for industrial applications such as AR-assisted manteinance and repair in which real equipment are augmented by visual aids. A possible complementary use of this technology for the same context can be achieved by performing virtual training in a “mixed reality environment” enabling to observe actual-size virtual replicas of real equipment within the physical space,...
Iris biometrics provide a mature and robust method of authentication, but are typically applied in a controlled environment and under constrained acquisition conditions. In this paper, the adaption of iris biometrics for unconstrained, hand-held use cases such as smartphones is investigated. A prototype optics-sensor combination is analysed in terms of its optical properties and iris imaging capabilities...
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