Holographic Display Layer Update Method
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Solution Overview
Problem
Existing methods for generating computer-generated holograms suffer from low quality due to quantization, particularly when summing layers, leading to reduced contrast and noise, and require high computational resources and many iterations.
Innovation Solution
A method that updates hologram data for each layer based on the data from other layers, using constraining data from previous frames to improve the quality of the combined hologram, allowing for reduced resource requirements and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hologram data is quantized based on SLM capabilities, then the display can operate with finite discrete phase values, but the quality of the displayed hologram deteriorates with low contrast and substantial noise
Solution Approach 1:
The patent applies preliminary action by performing iterative processing to generate multiple versions of hologram data before final display. Each iteration refines the hologram data by processing both the current frame and previous frame, progressively improving quality while preparing the final quantized output for SLM display.
Solution Approach 2:
The patent implements feedback by using the previous frame's hologram data to constrain and improve the current frame's hologram generation. The iterative process feeds back information from previous iterations to refine subsequent hologram data, progressively reducing noise and improving contrast through multiple passes.
2Manufacturing precision
If iterative methods such as IFTA are used to improve hologram quality, then image quality improves, but computational resource requirements and number of iterations increase significantly
Solution Approach 1:
The patent applies dynamics by adapting the iterative process to work with video frames sequentially rather than processing all frames simultaneously. The method dynamically processes frames in order, using each frame's result to constrain the next frame, reducing overall computational complexity while maintaining quality improvement.
Solution Approach 2:
The patent performs preliminary processing by generating hologram data for previous frames and storing it as constraining data. This preliminary action allows subsequent frames to benefit from pre-computed information, reducing the computational burden for each individual frame while maintaining high overall quality.
3Adaptability or versatility
If hologram data for multiple layers is generated and summed to create three-dimensional holograms, then three-dimensional image display is achieved, but the quality deteriorates due to loss of constant amplitude property
Solution Approach 1:
The patent uses feedback by processing layers iteratively, where each layer's hologram data is refined using information from other layers. The constant amplitude constraint is applied at each iteration, and the results feed back to improve subsequent layer processing, maintaining quality throughout the summation process.
Solution Approach 2:
The patent segments the three-dimensional hologram into multiple two-dimensional layers that can be processed independently and then combined. Each layer is processed through the iterative quality improvement process separately, allowing the constant amplitude property to be maintained in each segment before final combination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the quality of three-dimensional holograms by compensating for errors across layers, reducing noise and computational burden, and enabling efficient generation with minimal additional processing.
Implementation Method 1
Holographic displays employing Computer-Generated Holographic (CGH) patterns produce an image by means of diffraction and interference of light
Implementation Method 2
Holographic displays employing Computer-Generated Holographic (CGH) patterns produce an image by means of diffraction and interference of light
Data Source
AI summary
A method of generating a computer-generated hologram from a three-dimensional image comprising a plurality of two-dimensional image layers is provided. The method comprises generating hologram data for each layer of the image, and updating the hologram data of at least one layer of the image based on the hologram data of the other layers of the image.