HMD Aberration Correction for Vision-Corrected Observers
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Solution Overview
Problem
Conventional techniques fail to adequately correct aberrations in image display apparatuses like HMDs and EVFs, as they do not account for individual observer-specific vision correction optical systems, leading to suboptimal image quality due to varying degrees of vision correction.
Innovation Solution
An image processing apparatus and method that determines observer-specific aberration correction data by receiving aberration information from the observer's vision correction system, using pre-prepared data to calculate and apply appropriate correction values, ensuring each observer receives an aberration-reduced display image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a digital aberration correction technique is used to correct distortion and color misregistration, then the size of the optical system can be reduced and inexpensive lenses can be employed, but the correction is not adequate for observers using vision correction optical systems
Solution Approach 1:
The patent implements dynamic aberration correction by adjusting correction values based on the observer's vision characteristics. The system determines whether the observer uses a vision correction optical system and modifies the aberration correction accordingly, transforming a static correction approach into a dynamic one that adapts to individual observer needs.
Solution Approach 2:
The patent changes the correction parameters based on the observer's vision correction status. When an observer uses a vision correction optical system, the system adjusts the aberration correction values to compensate for the additional aberrations introduced by the vision correction lenses, thereby maintaining high correction accuracy across different observer types.
2Ease of operation
If a single aberration correction value is used for all observers, then the device operation is simplified, but observers using vision correction optical systems experience degraded image quality
Solution Approach 1:
The patent segments the observer population into two groups: those who do not use vision correction optical systems and those who do. The system determines which group the current observer belongs to and applies the appropriate correction values, thereby providing personalized correction without significantly complicating the overall operation.
Solution Approach 2:
The patent incorporates a feedback mechanism where the system determines the observer's vision correction status and uses this information to adjust the aberration correction values. This feedback loop enables the system to adapt to individual observer needs while maintaining relatively simple operation through automated determination and adjustment.
3Manufacturing precision
If aberration correction is optimized for observers with good vision, then those observers experience high image quality, but observers using vision correction optical systems observe color misregistration
Solution Approach 1:
The patent creates a universal aberration correction system that serves both observers with good vision and those using vision correction optical systems. By determining the observer's vision correction status and applying appropriate correction values, the system achieves multi-functionality, accommodating different observer types without requiring separate correction systems.
Solution Approach 2:
The patent transforms the static correction system into a dynamic one that adapts to the observer's vision characteristics. The system determines whether the observer uses a vision correction optical system and adjusts the correction values accordingly, enabling the same system to optimize image quality for both observer types through dynamic parameter adjustment.
Data Source
AI summary
Units which respectively acquire information on an aberration generated by a display optical system and information on an aberration generated by a vision correction optical system used by an observer are arranged. Aberration correction is executed based on the two aberrations. An aberration generated by a combination of the display optical system and the vision correction optical system used by the observer can be appropriately corrected for each observer.