Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays

Abstract

The application of digital holography as a viable solution to 3D capture and display technology is examined. A review of the current state of the field is presented in which some of the major challenges involved in a digital holographic solution are highlighted. These challenges include (i) the removal of the DC and conjugate image terms, which are features of the holographic recording process, (ii) the reduction of speckle noise, a characteristic of a coherent imaging process, (iii) increasing the angular range of perspective of digital holograms (iv) and replaying captured and/or processed digital holograms using spatial light modulators. Each of these challenges are examined theoretically and several solutions are put forward. Experimental results are presented that demonstrate the validity of the theoretical solutions.

Extended viewing angle holographic display system with tilted SLMs in a circular configuration

“…5 . For example, we have demonstrated this using 10 such digital holograms added together over the integration time of a camera [8]. The difficulty in achieving the summation of a large number of speckle patterns lies in both the recording and display of high speed scenes using cameras and SLMs with fast rates.…”

“…Nowadays, for building such systems, devices based on liquid crystals are being recognized as the most suitable since they provide a very high accuracy in optical wave front reproduction [7,8]. However, their small size and relatively big pixels impose the utilization of more than one SLM in a holographic display system.…”

Holographic Capture and Display Systems in Circular Configurations

“…The SLMs in the holographic display are directly modulated with the captured phases [17]. The first implication of having the magnification factor associated with the size mismatch is that the SLMs must be placed at locations in order to simulate a uniformly magnified hologram.…”

Wide angle digital holographic interferometry with real-time optical reconstruction

“…Note that in this case the zero diffraction order is not removed and it disturb the central part of the image. There are numerical methods to remove unwanted zero and twin orders [5], however they are usually used for imaging purposes only as they may disturb the phases of an object which in the case of DHI is highly undesired. Anyhow the interferograms obtained from pairs of holograms captured from different object perspectives carry information about an object displacements.…”