Computer-generated display macro holograms

Displayers tend to becomethree-dimensional.Themost advantage of holographic 3D displays is the possibility to observe 3Dimages without using glasses. The quality of created images by this method has surprised everyone. In this paper, the experimental steps of making a transmission hologram have been mentioned. In what follows, current advances of this science-art will be discussed. The aim of this paper is to study the recent improvements in creating three-dimensional images and videos by means of holographic techniques. In the last section we discuss the potentials of holography to be applied in future.

Optics Express, 2007

We present an improved method for recording a synthesized Fourier hologram under incoherent white-light illumination. The advantage of the method is that the number of real projections needed for generating the hologram is significantly reduced. The new method, designated as synthetic projection holography, is demonstrated experimentally. We show that the synthetic projection holography barely affects the reconstructed images. However, by increasing the number of observed projections one can improve the synthetic projection hologram quality.

International Journal for Research in Applied Science and Engineering Technology, 2021

In this paper we discuss about the current technology "Holographic Display/Projection" and its interactive feature. We discuss about the holograms, their types, physics and mathematics used in it, its interactive feature of responding to finger gestures and the hand-drawn interface (electro-holography). We also discuss about the applications of Holography and the future of this technology, how will it help and what can be the advancement, and also the hypothetical suggestions that what else new can be added further in this technology. And ends with a conclusion that what have we found out in the research, what is the scope of this technology, why this should be used, and where can it be used. We will also learn that how this technology can help the humans to become futuristic and advanced.

2017

3D data visualization and 3D display have received extensive attention from researchers due to the rapid growth in computer graphics in the human’s daily life. Despite the massive studies efforts consumed for 3D visualization, the shape perception of a 3D model has not yet been satisfied. In this study, we enhanced the visualization of 3D data for a hologram pyramid display by proposing a procedure named the hololighting style which consists of two steps. The first step is enhancing the shape perception of the 3D data. We proposed a new lighting system to emphasize the shape feature by employing non-photorealistic rendering as an alternative to the traditional lighting. The second step in the procedure is 3D hologram rendering for the hologram pyramid display. The screen is split in this step into nine segments for creating four viewports to contain 3D object from four views which are front, back, left and right. These steps are created and implemented using Visual C++, OpenGL 4.5. The results showed the enhancement of the 3D data as a hologram floating inside a transparent pyramid. The quality of the hologram is reported to be preferred when compared to a traditional 2D display. Moreover, the shape of the 3D data was reported to be enhanced by the new lighting style when compared to traditional lighting.

Three-Dimensional Imaging, Visualization, and Display 2009, 2009

In digital holography, holograms are usually optically captured and then two-dimensional slices of the reconstruction volume are reconstructed by computer and displayed on a two-dimensional display. When the recording is of a three-dimensional scene then such two-dimensional display becomes restrictive. We outline our progress on capturing larger ranges of perspectives of three-dimensional scenes, and our progress on four approaches to better visualise this three-dimensional information encoded in the digital holograms. The research has been performed within a European Commission funded research project dedicated the capture, processing, transmission, and display of real-world 3D and 4D scenes using digital holography.

Handbook of Visual Display Technology, 2012

This chapter reviews the first 20 years of interactive electro-holographic displays and holographic video -from first instance in 1990 through recent innovations in computational approaches and photonic modulation schemes. The enormous computational and photonic challenges required to interactively generate three-dimensional (3D) holographic images are examined, along with descriptions of techniques used to overcome the limitations on holographic computation and high-bandwidth photonic modulation. Included are the techniques of bipolar fringe computation, diffraction-specific fringe computation, and utilization of computer graphics hardware, as well as the scanned acousto-optic modulation technique (used in early display systems) and the liquid-crystal modulation technologies used in recent holographic displays.

ACM SIGGRAPH Computer Graphics, 1997

Computer graphics is confined chiefly to flat images. Images may look three-dimensional (3D), and sometimes create the illusion of 3D when displayed, for example, on a stereoscopic display [16, 13, 12]. Nevertheless, when viewing an image on most display systems, the human visual system (HVS) sees a flat plane of pixels. Volumetric displays can create a 3D computer graphics image, but fail to provide many visual depth cues (e.g. shading texture gradients) and cannot provide the powerful depth cue of overlap (occlusion). Discrete parallax displays (such as lenticular displays) promise to create 3D images with all of the depth cues, but are limited by achievable resolution. Only a real-time electronic holographic ("holovideo") display [11, 6, 8, 7, 9, 21, 22, 20, 2] can create a truly 3D computer graphics image with all of the depth cues (motion parallax, ocular accommodation, occlusion, etc.) and resolution sufficient to provide extreme realism [13]. Holovideo displays prom...

2005

We present a scalable holographic system design targeting multi-user interactive computer graphics applications. The display uses a specially arranged array of micro-displays and a holographic screen. Each point of the holographic screen emits light beams of different color and intensity to the various directions, in a controlled manner. The light beams are generated through a light modulation system arranged in a specific geometry and the holographic screen makes the necessary optical transformation to compose these beams into a perfectly continuous 3D view. With proper software control, the light beams leaving the various pixels can be made to propagate in multiple directions, as if they were emitted from physical objects at fixed spatial locations. The display is driven by DVI streams generated by multiple consumer level graphics boards and decoded in real-time by image processing units that feed the optical modules at high refresh rates. An OpenGL compliant library running on a ...

Applied optics, 2018

Recently, holographic display and computer-generated holograms calculated from real existing objects have been more actively investigated to support holographic video applications. In this paper, we proposed a method of generating 360-degree color holograms of real 3D objects in an efficient manner. 360-degree 3D images are generated using the actual 3D image acquisition system consisting of a depth camera and a turntable and intermediate view generation. Then, 360-degree color holograms are calculated using a viewing-window-based computer-generated hologram. We confirmed that floating 3D objects are faithfully reconstructed around a 360-degree direction using our 360-degree tabletop color holographic display.

Applied Optics, 1970

A new technique has been devised for recording and reconstructing holograms which can be viewed from a wide range of angles simultaneously by a large number of people. The problems which arise through the use of this technique have been analyzed and the limitations delineated. Satisfactory wide angle, three-dimensional displays have been constructed in the manner described by using absorption holograms. The features of these holographic displays agree qualitatively with the predicted theoretical limitations.