Hologram Generation Using Vertical Sub-Plane Partitioning
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Solution Overview
Problem
Current holographic technologies face challenges in efficiently generating Fresnel holograms with desirable visual quality and resolution, particularly in real-time applications, and suffer from limited viewing angles and reduced resolution due to high computational costs and complex hardware requirements.
Innovation Solution
A system and method that partitions a 3D object scene into regularly spaced vertical sub-planes, converts these into a sequence of sub-lines, and employs multi-rate filtering using convolution or fast Fourier transforms to generate Fresnel holograms, significantly reducing computation time and maintaining vertical parallax.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to generate Fresnel holograms, then computation time is reduced, but generation speed is still insufficient for real-time applications
Solution Approach 1:
The patent segments the hologram generation process into multiple independent stages: (1) converting the 3D object scene into a sequence of sub-lines, (2) applying multi-rate filtering to generate diffraction patterns, and (3) combining results to produce the final hologram. This segmentation allows each stage to be optimized independently and enables parallel processing, achieving real-time generation speeds up to 40,000 times faster than conventional methods.
Solution Approach 2:
The patent transforms the traditional 2D hologram generation approach into a 1D sub-line based methodology. By processing the hologram as a sequence of horizontal sub-lines rather than treating it as a complete 2D pattern, the computation is simplified and accelerated. This dimensional reduction enables real-time processing while maintaining image quality and vertical parallax.
2Manufacturing precision
If high resolution Fresnel holograms are generated, then image quality is improved, but computation cost increases significantly
Solution Approach 1:
The patent divides the high-resolution hologram generation into manageable segments by processing horizontal sub-lines independently. Each sub-line can be processed at lower computational complexity while the overall resolution is maintained through the accumulation of these segmented results. This allows high-resolution holograms to be generated without proportionally increasing total computation cost.
Solution Approach 2:
The patent employs multi-rate filtering that dynamically adjusts processing parameters based on the requirements of different hologram regions. By changing the filtering rate and computational intensity adaptively, the system maintains high resolution where needed while reducing computation in less critical areas, thereby lowering overall computation complexity.
3Ease of manufacture
If scan planes are separated by adequate distance to support vertical diffraction, then hologram generation is simplified, but scene image resolution is lowered
Solution Approach 1:
The patent resolves this contradiction by changing the processing dimension from complete 2D scan planes to 1D horizontal sub-lines. This allows adequate separation between processed elements while maintaining vertical resolution through the sub-line approach. The horizontal sub-line processing enables simplified generation while preserving scene image resolution through proper vertical sampling.
Solution Approach 2:
The patent optimizes the separation distance parameter between scan planes by using multi-rate filtering that adapts the vertical sampling rate. This allows the system to use larger separations for simplified processing while compensating for resolution loss through intelligent filtering parameters, thereby maintaining both ease of manufacture and image resolution.
4Adaptability or versatility
If conventional hologram generation methods are used, then hardware requirements are reduced, but viewing angle is limited
Solution Approach 1:
The patent achieves wide viewing angle by processing holograms through horizontal sub-lines that preserve vertical parallax information. This 1D-based approach maintains the angular information necessary for wide viewing angles without requiring complex hardware modifications. The sub-line processing naturally preserves the geometric relationships needed for versatile viewing.
Data Source
AI summary
Systems, methods, and devices that generate and display a holographic image(s) of a 3-D real or synthetic object scene are presented. A holographic generator component (HGC) partitions a 3-D object scene into a horizontal stack of regularly spaced vertical sub-planes that are each contributed to a respective sub-line. The HGC converts the sequence of sub-lines into a collection of diffraction patterns, which are summed up and interfered with a reference beam to generate the complete hologram, which can be or can approximate a Fresnel hologram. A multi-rate filter is employed to facilitate converting sub-lines to diffraction patterns more quickly. The multi-rate filtering can be realized using convolution in the spatial domain, realized in the frequency domain using a fast Fourier transform, and/or realized in the frequency domain using a graphic processing unit.