Optical field data compression by opto-digital means

Abstract

Compression of optical field data is of interest due to the many applications where this kind of information processing is necessary. In particular, holographic recording has significant requirements in a high volume of both phase and amplitude data. We analyze and present a comparison between the performances of two lossy compression methods applied over optical field data: the optical scaling compression technique based on a virtual optical system that performs a scaling of the optical field data, and the JPEG format. In particular, we study the compression of optical fields data extracted from off-axis digital holograms. Our results show that optical scaling is better suited for the compression of the highly random phase information found in the optical field data of 3D diffuse objects. Data loss and volume reduction for each method are measured and compared.

Notable advances in photonics: the JOPT Highlights of 2016

“…The authors of the chosen Highlights articles feature research on some of these key areas. Velez et al analyzed and presented a comparison between the performances of two lossy compression methods of optical field data [33]. Willner et al review recent studies on the potential challenges for an orbital angular momentum multiplexing systems [34].…”

Experimental holographic movie compression using optical scaling and sampling

“…Furthermore, the conventional image and video compression methods used to reduce the data storage need in common digital applications are ineffective for holograms, since the amplitude and phase contained in a hologram differ substantially from conventional image content [15]. For these reasons, the research in efficient managing, storing and processing of holographic data is of great interest, leading to several novel approaches in recent years [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Wavelet compression of off-axis digital holograms using real/imaginary and amplitude/phase parts

“…Frequency filtering techniques are often used for reducing the informative holographic data size considerably 39,40 .Currently, off-axis hologram compression is researched for problems in microscopy (images of red blood cells 14 , micro bio objects 15 , etc. ), terahertz systems 56 , 3D diffuse grayscale 57 and color 58 objects coding and imaging, computer-generated depth images representation 59 , next generation 3DTV applications 35,60 , quick volume scene displaying 61 , interferometry 15 , data multiplexing 62 , etc. Compression of off-axis digital holograms by binarization or direct quantization is used for visualization of optical scanning holographic data 63,64 , digital micromirror (DMD) applications 29,64 , fast printing and watermarking 65 , etc.There are two main aims of the paper:to compress single off-axis digital holograms using separation of the filtered spectrum into R/I parts andto perform a comparative analysis of the obtained results with those for compression by separation of the spectrum into A/P parts.Hologram compression based on a combination of a number of methods is analyzed, specifically,hologram frequency filtering,separation of the obtained spectrum into components,the wavelet transform, andadditional processing by quantization and thresholding.…”

“…Currently, off-axis hologram compression is researched for problems in microscopy (images of red blood cells 14 , micro bio objects 15 , etc. ), terahertz systems 56 , 3D diffuse grayscale 57 and color 58 objects coding and imaging, computer-generated depth images representation 59 , next generation 3DTV applications 35,60 , quick volume scene displaying 61 , interferometry 15 , data multiplexing 62 , etc. Compression of off-axis digital holograms by binarization or direct quantization is used for visualization of optical scanning holographic data 63,64 , digital micromirror (DMD) applications 29,64 , fast printing and watermarking 65 , etc.…”