Omnidirectional vision system using two mirrors

Takeya, Akito; Kuroda, Takeshi; Nishiguchi, Kimiyuki; Ichikawa, Akira

doi:10.1117/12.332486

Cited by 19 publications

(6 citation statements)

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“…Nagahara et al proposed a design for catadioptric optics for head mounted devices (HMDs), consisting of three mirrors, a planar, a hyperboloidal, and an ellipsoidal one, arranged such as to provide a single effective viewpoint, while achieving a wide field of view and avoiding occlusions of the field of view by the mirrors themselves [363]. Takeya et al proposed another similar design [488]. Kim and Cho addressed the problem of calibrating a system composed of multiple successive mirrors, using a learning-based approach [280].…”

Section: Central Catadioptric Cameras With Multiple Mirrors -Folded Cmentioning

confidence: 99%

Camera Models and Fundamental Concepts Used in Geometric Computer Vision

Sturm

2010

FNT in Computer Graphics and Vision

157

122

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A printed and bound version is available at a special discount price of US35 from Now Publishers. This can be obtained by entering the promotional code CGV006023 on https://www.nowpublishers.com/bookorder.aspx?doi=0600000023&product=CGVInternational audienceThis survey is mainly motivated by the increased availability and use of panoramic image acquisition devices, in computer vision and various of its applications. Different technologies and different computational models thereof exist and algorithms and theoretical studies for geometric computer vision ("structure-from-motion") are often re-developed without highlighting common underlying principles. One of the goals of this survey is to give an overview of image acquisition methods used in computer vision and especially, of the vast number of camera models that have been proposed and investigated over the years, where we try to point out similarities between different models. Results on epipolar and multi-view geometry for different camera models are reviewed as well as various calibration and self-calibration approaches, with an emphasis on non-perspective cameras. We finally describe what we consider are fundamental building blocks for geometric computer vision or structure-from-motion: epipolar geometry, pose and motion estimation, 3D scene modeling, and bundle adjustment. The main goal here is to highlight the main principles of these, which are independent of specific camera models

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Section: Central Catadioptric Cameras With Multiple Mirrors -Folded Cmentioning

confidence: 99%

Camera Models and Fundamental Concepts Used in Geometric Computer Vision

Sturm

2010

FNT in Computer Graphics and Vision

157

122

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“…3 shows images simultaneously taken by a visible-light fisheye camera and an omnidirectional IR camera at the same place during the day as well as at night. With the IR camera, the sky is distinctively dark; this makes it easy to detect the borderline between the sky and the buildings, which are captured in white, due to the difference in the atmospheric transmittance rate between visible light and IR rays [30]. Furthermore, halation of the charge-coupled device (CCD) image sensor caused by sunlight and street lights is observed in the red circle in the fisheye camera image in Fig.…”

Section: A Developed Omnidirectional Far-ir Cameramentioning

confidence: 97%

GPS Multipath Mitigation for Urban Area Using Omnidirectional Infrared Camera

Meguro

Murata

Takiguchi

et al. 2009

IEEE Trans. Intell. Transport. Syst.

173

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This paper describes a precision positioning technique that can be applied to vehicles in urban areas. The proposed technique mitigates Global Positioning System (GPS) multipath by means of an omnidirectional infrared (IR) camera that can eliminate the need for invisible satellites [a satellite detected by the receiver but without line of sight (LOS)] by using IR images. Some simple GPS multipath mitigation techniques, such as the installation of antennas away from buildings and using choke ring antennas, are well known. Further, various correlator techniques can also be employed. However, when a direct signal cannot be received by the antenna, these techniques do not provide satisfactory results because they presume that the antenna chiefly receives direct signals. On the other hand, the proposed technique can mitigate GPS multipath, even if a direct signal cannot be received because it can recognize the surrounding environment by means of an omnidirectional IR camera. With the IR camera, the sky appears distinctively dark; this facilitates the detection of the borderline between the sky and the surrounding buildings, which are captured in white, due to the difference in the atmospheric transmittance rate between visible light and IR rays. Positioning is performed only with visible satellites having fewer multipath errors and without using invisible satellites. With the proposed system, static and kinematic evaluations in which invisible satellites are discriminated through observation using an omnidirectional IR camera are conducted. Hence, signals are received even if satellites are hidden behind buildings; furthermore, the exclusion of satellites having large errors from the positioning computation becomes possible. The evaluation results confirm the effectiveness of the proposed technique and the feasibility of highly accurate positioning.Index Terms-Global Positioning System (GPS), infrared (IR) image sensors, multipath mitigation, self-positioning, urban areas.

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“…The last problem is a well-known issue in the back view mirror of cars. Recently Chahl [2] made an improvement on this concept, while Takeya proposed the use of a two-mirror omni-directional vision system [3], providing a more compact design. A different approach towards hemispherical viewing is the concept of the fish-eye lens, introduced decades ago, and widely available now from the major companies on the photo-and video camera market.…”

Section: Introduction Review Of Conceptsmentioning

confidence: 99%

IR panoramic alerting sensor concepts and applications

Jong

Schwering

2003

SPIE Proceedings

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During the last decade, protection of military and civilian operational platforms against weapons like guns, grenades, missiles, Unmanned Combat Aerial (and surface) Vehicles (UCAV's) and mines, has been an issue of increased importance due to the improved kill-probability of these threats. The standard countermeasure package of armour, guns, decoys, jammers, camouflage nets and smokes is inadequate when not accompanied by a suitable sensor package, primarily consisting of an alerting device, triggering consecutive steps in the countermeasure-chain. In this process of alert four different detection techniques are considered: pre-alert, giving the directions of possible attack, detection of an action of attack, identification of the threat and finally the precise localisation (3-D). The design of the alerting device is greatly depending on the platform, on which it will be used, the associated and affordable cost and the nature of the threat. A number of sensor packages, considered, developed and evaluated at TNO-FEL is presented for simple, medium size and large and expensive platforms. In recent years the requirements for these sensors have become more and more stringent due to the growing number of scenarios. The attack can practically be from any direction, implying the need for a large Field of Regard (FOR), the attack range can vary considerably and the type of threat can be very diverse, implying great flexibility and dynamic range and rapid response of the sensor. Especially the localisation at short ranges is a challenging issue. Various configurations including advantages and drawbacks are discussed.

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Omnidirectional vision system using two mirrors

Cited by 19 publications

References 0 publications

Camera Models and Fundamental Concepts Used in Geometric Computer Vision

Camera Models and Fundamental Concepts Used in Geometric Computer Vision

GPS Multipath Mitigation for Urban Area Using Omnidirectional Infrared Camera

IR panoramic alerting sensor concepts and applications

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