Partial Hologram Updating Through Complex Field Propagation
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Solution Overview
Problem
Existing hologram calculation methods are inefficient and computationally expensive, especially when updating or changing images in real-time, particularly in applications like head-up displays where minor changes require recalculating the entire hologram, leading to high computational demands.
Innovation Solution
A method for determining holograms by propagating a complex light field between a hologram plane and an image plane, modifying amplitudes to update specific image regions, and iteratively refining the hologram to efficiently adapt to changes, reducing the need for full recalculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full hologram recalculation is performed for image updates, then image update accuracy is maintained, but computational time and processing power increase significantly
Solution Approach 1:
The patent divides the full hologram into multiple sub-holograms corresponding to different regions of the image. When an update is required, only the affected sub-hologram is recalculated rather than the entire hologram. This segmentation allows selective updating of specific regions while maintaining overall image accuracy, significantly reducing computational time for partial updates.
Solution Approach 2:
The patent extracts and identifies specific regions of interest or changed areas within the image. By detecting which portions of the image have been modified, the system extracts only those corresponding sub-holograms that need recalculation, leaving the rest of the hologram unchanged. This extraction approach maintains update accuracy for modified regions while avoiding unnecessary computation for unchanged areas.
2Manufacturing precision
If iterative refinement is applied to improve image quality, then reconstruction quality increases, but computational complexity increases
Solution Approach 1:
The patent implements a dynamic iterative refinement process where the number of refinement iterations is adaptively determined based on the specific update requirements and region characteristics. For small or simple updates, fewer iterations are performed, while more complex or critical regions receive additional refinement passes. This dynamic approach optimizes the balance between reconstruction quality and computational complexity by adjusting the refinement level to match the actual needs of each update scenario.
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
The method allows for rapid and efficient updating of holograms, significantly reducing computational power requirements and enabling real-time hologram calculations with improved image quality, especially in systems with varying interpupil distances and head movements.
Implementation Method 1
Light scattered from an object contains both amplitude and phase information. This amplitude and phase information can be captured on, for example, a photosensitive plate by well-known interference techniques to form a holographic recording, or 'hologram'
Implementation Method 2
This amplitude and phase information can be captured on, for example, a photosensitive plate by well-known interference techniques to form a holographic recording
Data Source
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AI summary
A method comprising determining, from a first hologram of an image, a second hologram of a portion of the image. The method comprises providing or receiving the first hologram of the image. The method further comprises propagating a complex field corresponding to the first hologram from a hologram plane to an image plane. The method further comprises modifying amplitudes of the complex field in the image plane by setting amplitude components of the complex field that correspond to regions of the image that are outside of the portion of the image to be zero. The method further comprises propagating the modified complex field back from the image plane to the hologram plane thereby obtaining the second hologram of the portion of the image.