Multi-Layer 3D Display Calibration via Homography Matrix
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Solution Overview
Problem
Multi-layer three-dimensional (3D) displays face challenges in accurately calibrating the geometric relationships between display layers, leading to position errors and suboptimal visual effects.
Innovation Solution
A method and apparatus that utilize image capturing and homography calculation to determine the geometric relations between display layers by displaying a first image, capturing it with an image capturer, and calculating a homography matrix to correct positions and adjust display render parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-layer 3D display is constructed with multiple display layers, then three-dimensional visual effects are achieved, but position errors between layers occur leading to calibration difficulties
Solution Approach 1:
The patent replaces mechanical alignment methods with a computational vision approach. An image capturer captures images of displayed content, and homography calculation algorithms compute the geometric transformation matrices that describe the spatial relationships between layers. This substitution of mechanical measurement with optical capture and mathematical computation enables precise calibration without physical contact or complex mechanical fixtures.
Solution Approach 2:
The patent uses image copying to establish geometric relationships. The image capturer captures images of the displayed content on different layers, creating digital copies of the visual information. By analyzing the homography between these captured images, the system infers the spatial transformation between layers without needing direct physical measurement of the layers themselves.
2Measurement precision
If traditional calibration methods are used for multi-layer displays, then calibration process is simple, but measurement precision of geometric relations is insufficient
Solution Approach 1:
The patent introduces an intermediary calibration target with known geometric features (such as chessboard patterns or specific markers) that mediates between the display layers and the image capturer. This intermediary provides reference points that can be easily detected and used to compute homography matrices, simplifying the calibration process while achieving high measurement precision without requiring complex direct measurement systems.
Solution Approach 2:
The patent replaces complex mechanical measurement devices with a software-based homography calculation system. By using image processing algorithms to compute transformation matrices from captured images, the system achieves high measurement precision without requiring sophisticated mechanical measurement equipment, thereby reducing device complexity while improving accuracy.
3Reliability
If position correction is performed without accurate geometric calibration, then calibration time is reduced, but visual fidelity deteriorates
Solution Approach 1:
The patent performs preliminary geometric calibration by computing homography matrices between all display layers before actual content rendering. This preliminary action establishes accurate spatial relationships in advance, allowing the system to compensate for layer misalignments during normal operation. By doing the calibration work beforehand, the system achieves high visual fidelity without requiring time-consuming real-time adjustments during content display.
Solution Approach 2:
The patent replaces time-consuming manual alignment procedures with automated homography calculation and coordinate transformation algorithms. The system automatically computes the geometric relationships between layers and applies correction transformations to rendered content, achieving high visual fidelity through software-based correction rather than manual mechanical adjustment, thereby reducing calibration time while maintaining reliability.
Data Source
AI summary
Provided is an apparatus and method for calibrating a multi-layer three-dimensional (3D) display (MLD) that may control a 3D display including a plurality of display layers to display a first image on one of the plurality of display layers, acquire a second image by capturing the first image, calculate a homography between the display layer and an image capturer based on the first image and the second image, and calculate geometric relations of the display layer with respect to the image capturer based on the calculated homography.