Real-time three-dimensional object reconstruction by use of a phase-encoded digital hologram

Abstract

A three-dimensional (3D) object reconstruction technique that uses only phase information of a phaseshifting digital hologram and a phase-only spatial-light modulator is proposed. It is well known that a digital hologram can store both amplitude and phase information of an optical electric field and can reconstruct the original 3D object in a computer. We demonstrate that it is possible to reconstruct optically 3D objects using only phase information of the optical field calculated from phase-shifting digital holograms. The use of phase-only information enables us to reduce the amount of data in the digital hologram and reconstruct optically the 3D objects using a liquid-crystal spatial light modulator without optical power loss. Numerical evaluation of the reconstructed 3D object is presented.

Quantization noise and its reduction in lensless Fourier digital holography

“…Recently, the resolution of CCD/CMOS sensors has increased significantly and with it, so, too, has the computational requirement of a digital holographic imaging system. The bandwidth needed for transmission of holograms from one point to another has also increased, and hence compression of digital holograms has been an active area of research [9][10][11][12][13][14][15][16][17][18]. In this context, the quantization of the hologram and the effect on the reconstructed images has been studied before.…”

“…In [12], quantization of the real and imaginary parts of the complex hologram values (obtained from phase shifting) was studied in combination with lossless and lossy compression techniques. In [13], reconstruction from pure phase objects was studied, and perceptible reconstructions were achieved by using a 1 bit (binary) representation level. Various other quantization schemes were developed and studied by Shortt et al [14][15][16].…”

Three-dimensional Holographic Display with Twin Image Noise Rejection Using Off-axis Hologram Converting

“…최근에 는 실제 물체의 홀로그램 정보를 추출하고 추출된 홀로그램 의 위상 정보만을 이용하여 복원하는 방식의 3차원 홀로그 램 디스플레이가 시연되기도 했다. [9,10] [13] ( ) ( …”

Compression of Optically Encrypted Digital Holograms Using Artificial Neural Networks

“…Digital holography [15]- [21], and particularly phase-shift interferometry (PSI) [19]- [21], can record high quality representations of both the amplitude and phase of complex-valued optical wavefronts, and has been proposed for 3D object recognition and 3D display applications [22]- [25]. Recently, digital holography has been used in the encryption of two-dimensional (2D) images [6]- [8] and 3D objects [12]- [14].…”

“…Quantization in holograms [26], [27], and compression of real-valued [28] and complex-valued [13], [24], [25], [29]- [33], [35]- [37] digital holograms has received some attention to date. Some studies have also been performed on the decrypted-domain effects of perturbations, including quantization, in the encrypted domain [38], [39].…”