3D Display Motion Parallax Control via High-Pass Filtering
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Solution Overview
Problem
Existing 3D visualization methods, particularly those using image warping techniques for interactive motion parallax, suffer from image distortion and quality degradation due to viewpoint changes, especially when the viewer moves, leading to re-occlusion issues and holes in the synthesized image.
Innovation Solution
A display apparatus that receives 3D visual information and positional data from a viewer, applies high-pass filtering to the positional data to differentiate between intended and unintended movements, and renders a default image when the viewer is stationary, minimizing distortion and maintaining image quality by clipping and analyzing content for optimal filtering and clipping limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If image warping techniques are used for interactive motion parallax, then the perspective viewpoints become adaptive to the viewer's head position, but the images get distorted and quality degrades
Solution Approach 1:
The patent changes the parameter being used for viewpoint adaptation from absolute head position to head movement velocity. By filtering the positional signal through a high-pass filter, the system responds to changes in position (movement) rather than absolute position, thereby maintaining image quality while still providing adaptive viewpoints during active viewing
Solution Approach 2:
The patent introduces dynamic behavior by making the viewpoint adaptation dependent on the temporal derivative of head position (velocity). The system dynamically adjusts between static default rendering and dynamic warping-based rendering based on whether the viewer is moving or stationary, optimizing both adaptability and image quality
2Adaptability or versatility
If viewpoint offset is increased for large head movements, then interactive motion parallax is maintained, but distortion and image degradation become severe
Solution Approach 1:
The patent changes the control parameter from absolute position to velocity, which naturally limits the viewpoint offset to only when necessary (during movement). This prevents severe distortion that would occur with large static viewpoint offsets while maintaining adaptivity during actual head movements
3Adaptability or versatility
If the system continuously renders adaptive viewpoints, then interactive motion parallax is maintained, but processing resources are consumed even when the viewer is stationary
Solution Approach 1:
The patent implements periodic action by alternating between default rendering (when velocity is zero) and warping-based rendering (when velocity is non-zero). This pulsed approach to adaptive rendering consumes processing energy only when necessary, rather than continuously
Solution Approach 2:
The patent extracts the essential information needed for adaptive rendering (head movement velocity) from the continuous positional signal, and uses only this extracted information to trigger rendering updates, avoiding unnecessary processing when the viewer is stationary
Data Source
AI summary
A display apparatus (100) for displaying an output image on basis of 3D visual information is disclosed. The display apparatus (100) comprises: first receiving means (101) for receiving a first signal (3DV) representing the 3D visual information; second receiving means (116) for receiving a second signal (P) representing positional information of a viewer of the output image, as function of time; filtering means (122) for high-pass filtering the second signal (P), resulting in a third signal (PF); rendering means (118) for rendering the output image on basis of the first signal (3DV) and the third signal (PF); and display means (112) for displaying the output image.