Stereoscopic Display Disparity Correction for Depth Distortion
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Solution Overview
Problem
Current stereoscopic display technologies fail to correct distortion errors caused by the accommodation effect, leading to perceived depth discrepancies and distorted 3D perceptions, where objects appear elongated or flattened due to over- or under-estimation of depth.
Innovation Solution
A method and device that determine a rendered roundness factor table based on observer distance and object disparities, applying a disparity transform to modify object disparity values, ensuring a perceived roundness factor of unity for accurate depth perception, using a pinhole camera model and 3D creation software to correct stereoscopic distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stereoscopic display uses standard disparity rendering, then 3D content can be displayed, but depth perception distortion occurs due to accommodation effect
Solution Approach 1:
The invention changes the disparity parameters dynamically based on depth information. By adjusting disparity values according to object depth and viewer distance, the system compensates for accommodation-induced distortion, ensuring that perceived depth matches actual depth while maintaining comfortable viewing conditions.
Solution Approach 2:
The invention replaces the natural but flawed accommodation-convergence coupling mechanism with a computational model. Using the pinhole camera model and roundness factor calculations, the system mathematically determines corrected disparity values, substituting physiological coordination with algorithmic adjustment to eliminate depth distortion.
2Measurement precision
If disparity values are increased to enhance depth perception, then depth magnitude improves, but distortion errors increase due to accommodation effect
Solution Approach 1:
The invention dynamically adjusts disparity parameters based on depth distance and viewer position. By calculating optimal disparity values that account for accommodation effects, the system enhances depth perception magnitude while simultaneously maintaining depth rendering accuracy, avoiding the trade-off between the two.
Solution Approach 2:
The invention uses the roundness factor as a feedback mechanism to evaluate and correct disparity rendering. By continuously assessing whether rendered objects maintain their intended geometric properties (roundness factor of 1.0), the system adjusts disparity values to achieve both strong depth perception and accurate depth representation.
3Manufacturing precision
If stereoscopic content is rendered with high fidelity, then depth accuracy improves, but computational complexity increases due to roundness factor calculations
Solution Approach 1:
The invention transforms the complex problem of depth distortion correction into a series of manageable parameter adjustments. By using the pinhole camera model to calculate roundness factors and deriving correction multipliers from these factors, the system achieves high rendering fidelity through systematic parameter changes rather than complex iterative optimization.
Solution Approach 2:
The invention performs preliminary calculations of roundness factors and correction multipliers during content rendering or preprocessing. By pre-computing these correction parameters, the system reduces real-time computational complexity while maintaining high rendering fidelity, as the correction values can be applied directly without repeated complex calculations.
Data Source
AI summary
The invention concerns a method and a device for correcting distortion errors in a 3D content viewed by an observer on a screen. The method comprises the step of determining a rendered roundness factor (rrf) of a pinhole model projected cylinder, estimating a rendered roundness factor table depending on the defined distance of the observer to the screen and the disparity values of objects of the image, determining for the observer a disparity transform function (TD) as a function of the estimated rendered roundness factor table and modifying the object disparity values using the disparity transform so that a perceived roundness factor of one is provided.