AR Image Compensation for Uniform Luminance
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Solution Overview
Problem
Conventional augmented reality devices using multiple reflective units suffer from non-uniform luminance distribution, leading to unclear or unsharp images for users.
Innovation Solution
An image compensation device that pre-compensates luminance distribution information by determining a compensation function using the shape and array functions of reflective units, eye point spread function, and pupil characteristics, generating pre-compensated image information to ensure uniform luminance across the augmented reality image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple reflective units are used to provide augmented reality images, then the viewing angle and coverage are improved, but the luminance distribution becomes non-uniform causing unclear images
Solution Approach 1:
The patent applies local quality by assigning different luminance compensation values to different regions of the image. The image compensation device calculates and applies specific compensation values to different areas (e.g., center vs. periphery) to counteract the non-uniform luminance distribution caused by multiple reflective units, ensuring each region contributes uniformly to the final image quality.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and applying luminance compensation values before the augmented reality image is displayed. The compensation function is determined in advance based on the characteristics of the reflective units and eye point spread function, and the compensated image is generated beforehand to ensure uniform luminance distribution when the image is ultimately viewed by the user.
2Stability of the object's composition
If reflective units are made smaller than pupil size to increase depth of field, then focal depth is improved, but luminance distribution non-uniformity worsens
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the luminance compensation values based on the specific parameters of the reflective units (size, shape, arrangement) and the eye point spread function. The compensation function is calculated using these parameters to optimize the balance between depth of field and luminance uniformity for the given configuration of small reflective units.
Solution Approach 2:
The patent implements feedback by using the eye point spread function as a feedback mechanism. The compensation function determination unit uses the eye point spread function (which characterizes how the eye processes light from different directions) to calculate appropriate compensation values that account for the optical characteristics of the human visual system, thereby achieving uniform perceived luminance despite the small size and arrangement of reflective units.
3Reliability
If conventional optical systems with prisms are used, then virtual image reflection is achieved, but device weight and complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the optical system into multiple small reflective units arranged in an array, replacing the single large prism of conventional systems. Each reflective unit is much smaller than the pupil size, and collectively they perform the virtual image reflection function while significantly reducing the overall weight and complexity of the device.
Solution Approach 2:
The patent replaces the mechanical prism-based optical system with a lighter array of small reflective units combined with computational image compensation. This substitution reduces the mechanical complexity and weight while achieving the same virtual image reflection capability through a different architectural approach.
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 solution provides a clear and sharp augmented reality image with uniform luminance distribution, improving user experience by compensating for the non-uniformity issues in conventional devices.
Implementation Method 1
a plurality of reflective units disposed inside the optical means, and configured to transfer the augmented reality image light, output from the image output unit, to the pupil of the user by reflecting the augmented reality image light
Data Source
AI summary
The present invention relates to an image compensation device for an image for augmented reality. The image compensation device includes: a compensation function determination unit configured to determine a compensation function for compensating the luminance information of an observed image observed by a user through an optical device for augmented reality when an original image for augmented reality is output from an image output unit; and a pre-compensated image information generation unit configured to generate pre-compensated image information for augmented reality based on the compensation function determined by the compensation function determination unit and original image information for augmented reality. The image output unit outputs pre-compensated augmented reality image light corresponding to the pre-compensated image information for augmented reality, and the plurality of reflective units transfer the pre-compensated augmented reality image light to the pupil of the user by reflecting the pre-compensated augmented reality image light.