Adaptive Digital Hologram Binarization Method Based on Local Thresholding, Block Division and Error Diffusion

Abstract

High-speed optical reconstruction of 3D-scenes can be achieved using digital holography with binary digital micromirror devices (DMD) or a ferroelectric spatial light modulator (fSLM). There are many algorithms for binarizing digital holograms. The most common are methods based on global and local thresholding and error diffusion techniques. In addition, hologram binarization is used in optical encryption, data compression, beam shaping, 3D-displays, nanofabrication, materials characterization, etc. This paper proposes an adaptive binarization method based on a combination of local threshold processing, hologram division into blocks, and error diffusion procedure (the LDE method). The method is applied for binarization of optically recorded and computer-generated digital holograms of flat objects and three-dimensional scenes. The quality of reconstructed images was compared with different methods of error diffusion and thresholding. Image reconstruction quality was up to 22% higher by various metrics than that one for standard binarization methods. The optical hologram reconstruction using DMD confirms the results of the numerical simulations.

Non-iterative generation of binary amplitude holograms applied to holographic projection with digital micromirror devices

“…This approach can be relatively slow for high resolution holograms, and its performance is reduced when processing Fresnel holograms. To improve the performance of BAH generation with this approach, in [26] was introduced a modification based on adaptative thresholding binarization combined with block division of the hologram followed by error diffusion. In a second contribution, a hologram generated by means of the Gerchberg-Saxton algorithm is binarized using a random trajectory direct binary search [27].…”

HoloForkNet: Digital Hologram Reconstruction via Multibranch Neural Network

“…The reconstructed object image can be viewed as a 2D section or as a 3D scene. Images can also be reconstructed optically by displaying holograms on spatial light modulators (SLMs) [16,17]. Digital holography has great potential for application in various fields of science and technology [2], including artificial-intelligence-based methods [18][19][20][21].…”

What Binarization Method Is the Best for Amplitude Inline Fresnel Holograms Synthesized for Divergent Beams Using the Direct Search with Random Trajectory Technique?

“…Nowadays, DMD can display up to about 30 thousand images per second [ 2 ]. DMDs can be used in various tasks: holographic projection and 3D television [ 3 , 4 , 5 ], media characterization [ 6 ], compressing imaging [ 7 ], 3D printing [ 8 ], mode generation [ 9 ], spectroscopy [ 10 ], digital [ 11 ] and computer-generated [ 12 ] hologram reconstruction, information packaging [ 13 ], etc. The DMD operating principle allows for imaging of only binary images.…”