Holographic Display Update Map for Phantom Image Prevention
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Solution Overview
Problem
Holographic display systems using redundancy in 3D video often suffer from phantom image effects due to the blocking of background images by foreground objects, which limits the viewing angle and requires extensive calculations to prevent these effects.
Innovation Solution
A method and device that generate an update map to identify and update 3D points causing phantom images, using a modified update map to determine related points within a prescribed distance or pixel distance, and adjust the hologram accordingly to prevent phantom image effects without recalculating all points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hologram calculation is performed using look-up table method, then computing speed is enhanced, but phantom image effects occur due to blocking of background images by foreground objects
Solution Approach 1:
The patent segments the hologram calculation process by dividing 3D video frames into multiple depth layers. Each layer is processed separately using the look-up table method, allowing background layers to be calculated before foreground layers. This segmentation enables proper handling of occlusion relationships while maintaining the speed benefits of LUT-based calculation.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing hologram data for background objects in the look-up table before processing foreground objects. This ensures that when foreground objects occlude background objects, the background hologram data is already prepared and can be properly integrated, preventing phantom image effects while maintaining real-time generation capability.
2Reliability
If full hologram recalculation is performed to prevent phantom images, then image quality is improved, but computational complexity increases significantly
Solution Approach 1:
The patent applies partial action by recalculating only the affected regions where phantom image effects occur, rather than performing full hologram recalculation. When foreground objects occlude background objects, only the specific hologram portions corresponding to the occluded regions are recalculated using the layered depth information, significantly reducing computational complexity while eliminating phantom images.
Solution Approach 2:
The patent applies local quality by using depth information to identify specific regions requiring recalculation. The system determines which local areas of the hologram are affected by occlusion relationships and applies targeted recalculation only to those specific regions, rather than uniformly processing the entire hologram, thereby reducing overall computational burden.
3Productivity
If look-up table is used for real-time hologram generation, then generation speed is improved, but hardware specifications must be high
Solution Approach 1:
The patent segments the look-up table into multiple depth-specific tables, where each table stores hologram data for a specific depth layer. This segmentation allows the system to use smaller, more manageable hardware resources for each depth layer while maintaining real-time generation capability through efficient layered processing.
Solution Approach 2:
The patent applies partial action by loading and processing only the necessary depth layer data from the look-up table at each time step, rather than requiring the entire high-resolution hologram data to be processed simultaneously. This reduces the instantaneous hardware memory and processing requirements while maintaining real-time generation capability.
Data Source
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AI summary
A holographic display device and method of generating a hologram using redundancy of 3D video are disclosed. A storage unit stores the hologram of a previous 3D image frame. A control unit generates an update map indicating an update required 3D point among 3D points included in a current 3D image frame based on the current 3D image frame and the previous 3D image frame and modifies the update map to further include information indicating the update of a 3D point related to the update required.