Hynek Bakstein - Academia.edu (original) (raw)
Papers by Hynek Bakstein
Proceedings of the IEEE Workshop on Omnidirectional Vision 2002. Held in conjunction with ECCV'02
Procedings of the British Machine Vision Conference 2003, 2003
2003 Conference on Computer Vision and Pattern Recognition Workshop, 2003
Proceedings of the 2001 IEEE Computer Society Conference on Computer Vision and Pattern Recognition. CVPR 2001
An apparatus for the high-frequency artificial respiration of living animals or human beings has ... more An apparatus for the high-frequency artificial respiration of living animals or human beings has a flexible endotracheal tube for introduction into the trachea thereof. The flexible endotracheal tube has an outlet end, a valve at the outlet end and control and air supplies along the endotracheal tube to the valve. The control operates the valve to produce steep-flanked respiratory-air pulses. The valve can serve simultaneously for removing used air through a conventional endotracheal tube as a sleeve about the other endotracheal tube.
2005 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2005
ABSTRACT We propose a method for visual robot localization using a panoramic image volume as the ... more ABSTRACT We propose a method for visual robot localization using a panoramic image volume as the representation from which we can generate views from virtual viewpoints and match them to the current view. We use a geometric image-based rendering formalism in combination with a subspace representation of images, which allows us to synthesize views at arbitrary virtual viewpoints from a compact low-dimensional representation.
We presents a technique for 360 x 360 mosaicing,with a very wide field of view fish eye lens. Sta... more We presents a technique for 360 x 360 mosaicing,with a very wide field of view fish eye lens. Standard camera calibration is extended for lenses with a field of view bigger than 180 . We demonstrate,the calibration on a Nikon FCE8 fish eye converter, which is an example of a low-cost lens with 183 field of view. We illustrate the use of this lens on one application, the 360 x 360 mosaic which provides360 field of view in both vertical and horizontal direction.
ABSTRACT We propose a method for visual robot localisation using a panoramic image volume as the ... more ABSTRACT We propose a method for visual robot localisation using a panoramic image volume as the representation from which we can generate views from virtual viewpoints and match them to the current view. We use a geometric image-based rendering formalism in combination with a subspace representation of images, which allows us to synthesize views at arbitrary virtual points from a compact low-dimensional representation.
We focus on composition of mosaic images using a 360 x 360 mosaic camera. Such a cam- era is obta... more We focus on composition of mosaic images using a 360 x 360 mosaic camera. Such a cam- era is obtained by moving a 1D omnidirectional camera on a circular path. This 1D camera captures a set of light rays in one plane, which should be tangent to the circular path of the camera center and perpendicular to the plane in which this circle lies. However, in practical realizations, this condition does not need to be fulfilled exactly. There are three possible rotations of the 1D omnidirectional camera in space. In this paper we investigate one of them, the in-plane rotation. We show that this rotation breaks the epipolar rectification of the mosaic images and we show that only one point correspondence is required to rectify the images. We also examine the effect of non-square pixels of the CCD cameras used for a practical realization of the 360 x 360 mosaic camera.
This document deals with issues arising during acquisition of images for IBR used in the BeNoGo p... more This document deals with issues arising during acquisition of images for IBR used in the BeNoGo project. We describe the acquisition setup at our disposal and we focus on specific issues for each device as well as general issues of the acquisition process. We describe the main difficulties and we try to characterize an “ideal” scenario which can be acquired with our technology.
This thesis proposal deals with a 3D reconstruction from noncentral cameras. An introduction to t... more This thesis proposal deals with a 3D reconstruction from noncentral cameras. An introduction to the 3D reconstruction in general is given, together with the definition of non-central cameras and their comparison with central cameras. State-of-the-art in the field of the non-central cameras is presented. Our previous contribution in this area is described and thesis goals are formulated.
We present a complete step-by-step approach to calibration of ultra wide angle fish-eye lenses wi... more We present a complete step-by-step approach to calibration of ultra wide angle fish-eye lenses with the angle of view larger than 180 . Such a large field of view is necessary for some applications such as the 360 x 360 mosaicing. Recently, a Nikon FC-E8 fish eye lens converter with the field of view equal 183 become available. In this paper, we propose its model, suggest a calibration procedure, and demonstrate its use in a mosaicing application. First of all we propose a general model of a camera with field of view larger than 180 . Then, we identify the structure and the parameters of the mapping between the incoming light rays and pixels for the Nikon FC-E8 converter. Finally, we present a complete camera calibration method from a known calibration target.
An electronic ignition system for a gas burner is battery operated. The battery voltage is applie... more An electronic ignition system for a gas burner is battery operated. The battery voltage is applied through a DC-DC chopper to a step-up transformer to charge a capacitor which provides the ignition spark. The step-up transformer has a significant leakage reactance in order to limit current flow from the battery during initial charging of the capacitor. A tank circuit at the input of the transformer returns magnetizing current resulting from the leakage reactance to the primary in succeeding cycles. An SCR in the output circuit is gated through a voltage divider which senses current flow through a flame. Once the flame is sensed, further sparks are precluded. The same flame sensor enables a thermopile driven main valve actuating circuit. A safety valve in series with the main gas valve responds to a control pressure thermostatically applied through a diaphragm. The valve closes after a predetermined delay determined by a time delay orifice if the pilot gas is not ignited.
Proceedings of the IEEE Workshop on Omnidirectional Vision 2002. Held in conjunction with ECCV'02
Procedings of the British Machine Vision Conference 2003, 2003
2003 Conference on Computer Vision and Pattern Recognition Workshop, 2003
Proceedings of the 2001 IEEE Computer Society Conference on Computer Vision and Pattern Recognition. CVPR 2001
An apparatus for the high-frequency artificial respiration of living animals or human beings has ... more An apparatus for the high-frequency artificial respiration of living animals or human beings has a flexible endotracheal tube for introduction into the trachea thereof. The flexible endotracheal tube has an outlet end, a valve at the outlet end and control and air supplies along the endotracheal tube to the valve. The control operates the valve to produce steep-flanked respiratory-air pulses. The valve can serve simultaneously for removing used air through a conventional endotracheal tube as a sleeve about the other endotracheal tube.
2005 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2005
ABSTRACT We propose a method for visual robot localization using a panoramic image volume as the ... more ABSTRACT We propose a method for visual robot localization using a panoramic image volume as the representation from which we can generate views from virtual viewpoints and match them to the current view. We use a geometric image-based rendering formalism in combination with a subspace representation of images, which allows us to synthesize views at arbitrary virtual viewpoints from a compact low-dimensional representation.
We presents a technique for 360 x 360 mosaicing,with a very wide field of view fish eye lens. Sta... more We presents a technique for 360 x 360 mosaicing,with a very wide field of view fish eye lens. Standard camera calibration is extended for lenses with a field of view bigger than 180 . We demonstrate,the calibration on a Nikon FCE8 fish eye converter, which is an example of a low-cost lens with 183 field of view. We illustrate the use of this lens on one application, the 360 x 360 mosaic which provides360 field of view in both vertical and horizontal direction.
ABSTRACT We propose a method for visual robot localisation using a panoramic image volume as the ... more ABSTRACT We propose a method for visual robot localisation using a panoramic image volume as the representation from which we can generate views from virtual viewpoints and match them to the current view. We use a geometric image-based rendering formalism in combination with a subspace representation of images, which allows us to synthesize views at arbitrary virtual points from a compact low-dimensional representation.
We focus on composition of mosaic images using a 360 x 360 mosaic camera. Such a cam- era is obta... more We focus on composition of mosaic images using a 360 x 360 mosaic camera. Such a cam- era is obtained by moving a 1D omnidirectional camera on a circular path. This 1D camera captures a set of light rays in one plane, which should be tangent to the circular path of the camera center and perpendicular to the plane in which this circle lies. However, in practical realizations, this condition does not need to be fulfilled exactly. There are three possible rotations of the 1D omnidirectional camera in space. In this paper we investigate one of them, the in-plane rotation. We show that this rotation breaks the epipolar rectification of the mosaic images and we show that only one point correspondence is required to rectify the images. We also examine the effect of non-square pixels of the CCD cameras used for a practical realization of the 360 x 360 mosaic camera.
This document deals with issues arising during acquisition of images for IBR used in the BeNoGo p... more This document deals with issues arising during acquisition of images for IBR used in the BeNoGo project. We describe the acquisition setup at our disposal and we focus on specific issues for each device as well as general issues of the acquisition process. We describe the main difficulties and we try to characterize an “ideal” scenario which can be acquired with our technology.
This thesis proposal deals with a 3D reconstruction from noncentral cameras. An introduction to t... more This thesis proposal deals with a 3D reconstruction from noncentral cameras. An introduction to the 3D reconstruction in general is given, together with the definition of non-central cameras and their comparison with central cameras. State-of-the-art in the field of the non-central cameras is presented. Our previous contribution in this area is described and thesis goals are formulated.
We present a complete step-by-step approach to calibration of ultra wide angle fish-eye lenses wi... more We present a complete step-by-step approach to calibration of ultra wide angle fish-eye lenses with the angle of view larger than 180 . Such a large field of view is necessary for some applications such as the 360 x 360 mosaicing. Recently, a Nikon FC-E8 fish eye lens converter with the field of view equal 183 become available. In this paper, we propose its model, suggest a calibration procedure, and demonstrate its use in a mosaicing application. First of all we propose a general model of a camera with field of view larger than 180 . Then, we identify the structure and the parameters of the mapping between the incoming light rays and pixels for the Nikon FC-E8 converter. Finally, we present a complete camera calibration method from a known calibration target.
An electronic ignition system for a gas burner is battery operated. The battery voltage is applie... more An electronic ignition system for a gas burner is battery operated. The battery voltage is applied through a DC-DC chopper to a step-up transformer to charge a capacitor which provides the ignition spark. The step-up transformer has a significant leakage reactance in order to limit current flow from the battery during initial charging of the capacitor. A tank circuit at the input of the transformer returns magnetizing current resulting from the leakage reactance to the primary in succeeding cycles. An SCR in the output circuit is gated through a voltage divider which senses current flow through a flame. Once the flame is sensed, further sparks are precluded. The same flame sensor enables a thermopile driven main valve actuating circuit. A safety valve in series with the main gas valve responds to a control pressure thermostatically applied through a diaphragm. The valve closes after a predetermined delay determined by a time delay orifice if the pilot gas is not ignited.