Comparative appraisal of global and local thresholding methods for binarisation of off-axis digital holograms

Optimization of DMD-based independent amplitude and phase modulation: a spatial resolution and quantization

“…Secondly, this diffraction order is filtered by aperture, while others are blocked. Although there are various techniques for binarization of necessary patterns [28][29][30][31][32] , computer-generated Lee holography 33 is one of the most reliable methods to perform fast and efficient generation of binary patterns.…”

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

“…The different methods of compressing holographic image or video files 10–13 can be divided into three main groups based on the following:image and video compression standards (JPEG, HEVC, etc.) 13–20 , including additional HEVC-coding optimization 18 and neural network post-processing 19 ;vector and scalar methods of quantization (iterative or noniterative) 10,21–29 , including phase-difference-based implementation 28 and local and global thresholding binarization 29 ; andwavelet transforms 11,30–41 , including the cosine transform 32,33 and the Fresnelet transform 34 .However, several other compression methods can be considered separately from the above-mentioned groups: for example, scanning methods 33,42 and generative approaches 43 . A number of methods can be assigned to different groups of techniques also.…”

“…), 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.…”

“…vector and scalar methods of quantization (iterative or noniterative) 10,21–29 , including phase-difference-based implementation 28 and local and global thresholding binarization 29 ; and…”

“…), 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.…”