The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Yih-shyang Cheng - One of the best experts on this subject based on the ideXlab platform.
-
Image design and replication for Image-Plane disk-type multiplex holograms
Japanese Journal of Applied Physics, 2017Co-Authors: Chih-hung Chen, Yih-shyang ChengAbstract:The fabrication methods and parameter design for both real-Image generation and virtual-Image display in Image-Plane disk-type multiplex holography are introduced in this paper. A theoretical model of a disk-type hologram is also presented and is then used in our two-step holographic processes, including the production of a non-Image-Plane master hologram and optical replication using a single-beam copying system for the production of duplicated holograms. Experimental results are also presented to verify the possibility of mass production using the one-shot holographic display technology described in this study.
-
Reflection-type Image-Plane Conical Multiplex Holography
Frontiers in Optics, 2013Co-Authors: Yih-shyang ChengAbstract:Astigmatic optical systems are used for both object and reference waves to compensate for the bending effect in making reflection-type Image-Plane conical multiplex hologram. Spectral characteristic of the reconstructed Image is described.
-
Image-Plane alcove reflection hologram using one-step recording
The International Commission for Optics, 2011Co-Authors: Yih-shyang ChengAbstract:Image-Plane technique can overcome the annoying "picket-fence" effect encountered in the traditional multiplex holography. Previously, we have adopted a three-step process to fabricate a reflection-type Image-Plane alcove hologram. Here, we design an anamorphic optical system for the object wave which is mixed with light diffracted from a line segment on a diffuser to simplify the recording process to one step. Experimental result shows single-colored Image reconstructed with white light from LED. Qualitative description of some characteristics of the reconstructed Image is also presented.
-
Image-Plane Reflection-Type Alcove Multiplex Hologram
Frontiers in Optics, 2010Co-Authors: Yih-shyang Cheng, Chih-hung ChenAbstract:A three-step holographic process, which enables the incorporation of the Image-Plane technique in the fabrication of the reflection alcove multiplex hologram, is described. Experimental result demonstrating the feasibility of this method is presented.
-
Image-Plane disk-type multiplex hologram.
Applied optics, 2003Co-Authors: Yih-shyang Cheng, Chih-hung ChenAbstract:We demonstrate, both theoretically and experimentally, that a disk-type multiplex hologram can be fabricated as an Image-Plane hologram that is suitable for white-light line-source reconstruction. By adopting the method of direct object-Image relationship, we build the theory based on the imaging property of lenses and on coordinate transformation. Numerical simulation shows the characteristics of this type of hologram. Experimental results reveal that the picket-fence effect that is encountered in the traditional multiplex hologram for Images viewed at various distances has been eliminated. Using a reconstruction white-light line source of sufficient length, we observed an achromatic three-dimensional Image.
Simon J. Watt - One of the best experts on this subject based on the ideXlab platform.
-
Vergence and accommodation to multiple-Image-Plane stereoscopic displays: “real world” responses with practical Image-Plane separations?
Journal of Electronic Imaging, 2012Co-Authors: Kevin J. Mackenzie, R. A. Dickson, Simon J. WattAbstract:Conventional stereoscopic displays present Images on a single focal Plane. The resulting mismatch between the stimuli to the eyes' focusing response (accommodation) and to convergence causes fatigue and poor stereo performance. One solution is to distribute Image intensity across a number of widely spaced Image Planes—a technique referred to as depth filtering. Previously, we found this elicits accurate, continuous monocular accommodation responses with Image-Plane separations as large as 1.1 Diopters (D, the reciprocal of distance in meters), suggesting that a small number of Image Planes could eliminate vergence-accommodation conflicts over a large range of simulated distances. Evidence exists, however, of systematic differences between accommodation responses to binocular and monocular stimuli when the stimulus to accommodation is degraded, or at an incorrect distance. We examined the minimum Image-Plane spacing required for accurate accommodation to binocular depth-filtered Images. We compared accommodation and vergence responses to changes in depth speci- fied by depth filtering, using Image-Plane separations of 0.6 to 1.2 D, and equivalent real stimuli. Accommodation responses to real and depth-filtered stimuli were equivalent for Image-Plane separations of ∼0.6 to 0.9 D, but differed thereafter. We conclude that depth filter- ing can be used to precisely match accommodation and vergence demand in a practical stereoscopic display. © 2012 SPIE and IS&T. (DOI: 10.1117/1.JEI.21.1.011002)
-
Vergence and accommodation to multiple-Image-Plane stereoscopic displays: 'Real world' responses with practical Image-Plane separations?
Proceedings of SPIE, 2011Co-Authors: Kevin J. Mackenzie, R. A. Dickson, Simon J. WattAbstract:Conventional stereoscopic displays present Images on a single focal Plane. The resulting mismatch between the stimuli to the eyes' focusing response (accommodation) and to convergence causes fatigue and poor stereo performance. One promising solution is to distribute Image intensity across a number of relatively widely spaced Image Planes - a technique referred to as depth filtering. Previously, we found this elicits accurate, continuous monocular accommodation responses with Image-Plane separations as large as 1.1 Diopters, suggesting that a relatively small (i.e. practical) number of Image Planes is sufficient to eliminate vergence-accommodation conflicts over a large range of simulated distances. However, accommodation responses have been found to overshoot systematically when the same stimuli are viewed binocularly. Here, we examined the minimum Image-Plane spacing required for accurate accommodation to binocular depth-filtered Images. We compared accommodation and vergence responses to step changes in depth for depth-filtered stimuli, using Image-Plane separations of 0.6-1.2 D, and equivalent real stimuli. Accommodation responses to real and depth-filtered stimuli were equivalent for Image-Plane separations of ~0.6-0.9 D, but inaccurate thereafter. We conclude that depth filtering can be used to precisely match accommodation and vergence demand in a practical stereoscopic display, using a relatively small number of Image Planes.
Carmen S. Menoni - One of the best experts on this subject based on the ideXlab platform.
-
Image Plane Holographic Microscopy With a Table-Top Soft X-Ray Laser
IEEE Photonics Journal, 2015Co-Authors: Jaroslav Nejdl, Isela D. Howlett, Erik H. Anderson, W. Chao, Mario C. Marconi, Jorge J. Rocca, D. Carlton, Carmen S. MenoniAbstract:We demonstrate Image Plane holographic microscopy in the soft X-ray (SXR) spectral region, combining the coherent output from a 46.9-nm wavelength table-top SXR laser and two Fresnel zone plates. Phase and amplitude maps of the object are simultaneously obtained from holograms created at the Image Plane by the superposition of a reference and object beam originating from the zero and first diffraction order of the zone plates. We have used the microscope to record holograms of nanometer-scale periodic Si elbow patterns with 30% absorption contrast at the laser wavelength. The measured phase shift of 2.3 rad accurately predicts the Si dense line step height of 100 nm. The scheme is scalable to shorter wavelengths and allows for simultaneous high spatial and temporal resolution.
-
Soft x-ray Image Plane holographic microscopy
CLEO: 2013, 2013Co-Authors: Jaroslav Nejdl, Isela D. Howlett, Erik H. Anderson, W. Chao, Mario C. Marconi, Jorge J. Rocca, D. Carlton, Carmen S. MenoniAbstract:Image Plane holographic microscopy is demonstrated combining coherent illumination from a compact 46.9 nm wavelength laser with Fresnel zone plate optics. The method enables imaging of low absorption samples with high resolution.
-
Nanoscale resolution Image Plane holographic microscopy
2013 IEEE Photonics Conference, 2013Co-Authors: Jaroslav Nejdl, Isela D. Howlett, N. Monserut, D. Paterson, Erik H. Anderson, W. Chao, Mario C. Marconi, Jorge J. Rocca, Carmen S. MenoniAbstract:We demonstrate nanoscale spatial resolution Image Plane holographic microscopy at extreme ultraviolet wavelengths. We show the advantages of the method for imaging test pattern samples with an absorption contrast of ~30%.
Chih-hung Chen - One of the best experts on this subject based on the ideXlab platform.
-
Image design and replication for Image-Plane disk-type multiplex holograms
Japanese Journal of Applied Physics, 2017Co-Authors: Chih-hung Chen, Yih-shyang ChengAbstract:The fabrication methods and parameter design for both real-Image generation and virtual-Image display in Image-Plane disk-type multiplex holography are introduced in this paper. A theoretical model of a disk-type hologram is also presented and is then used in our two-step holographic processes, including the production of a non-Image-Plane master hologram and optical replication using a single-beam copying system for the production of duplicated holograms. Experimental results are also presented to verify the possibility of mass production using the one-shot holographic display technology described in this study.
-
Image-Plane Reflection-Type Alcove Multiplex Hologram
Frontiers in Optics, 2010Co-Authors: Yih-shyang Cheng, Chih-hung ChenAbstract:A three-step holographic process, which enables the incorporation of the Image-Plane technique in the fabrication of the reflection alcove multiplex hologram, is described. Experimental result demonstrating the feasibility of this method is presented.
-
Image-Plane disk-type multiplex hologram.
Applied optics, 2003Co-Authors: Yih-shyang Cheng, Chih-hung ChenAbstract:We demonstrate, both theoretically and experimentally, that a disk-type multiplex hologram can be fabricated as an Image-Plane hologram that is suitable for white-light line-source reconstruction. By adopting the method of direct object-Image relationship, we build the theory based on the imaging property of lenses and on coordinate transformation. Numerical simulation shows the characteristics of this type of hologram. Experimental results reveal that the picket-fence effect that is encountered in the traditional multiplex hologram for Images viewed at various distances has been eliminated. Using a reconstruction white-light line source of sufficient length, we observed an achromatic three-dimensional Image.
K. Usher - One of the best experts on this subject based on the ideXlab platform.
-
Tracking road edges in the panospheric Image Plane
Proceedings 2003 IEEE RSJ International Conference on Intelligent Robots and Systems (IROS 2003) (Cat. No.03CH37453), 2003Co-Authors: P.i. Corke, D. Symeonidis, K. UsherAbstract:This paper presents a technique for tracking road edges in a panoramic Image sequence. The major contribution is that instead of unwarping the Image to find parallel lines representing the road edges, we choose to warp the parallel groundPlane lines into the Image Plane of the equiangular panospheric camera. Updating the parameters of the line thus involves searching a very small number of pixels in the panoramic Image, requiring considerably less computation than unwarping. Results using real-world Images, including shadows, intersections and curves, are presented.
