Perspective-Correct Rendering for Tilted Multi-Display Arrays
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Solution Overview
Problem
Perspective distortion occurs when rendering images on multiple displays, especially when peripheral displays are tilted, leading to an unsatisfying user experience due to image stretching and blurring, and existing solutions like using multiple GPUs increase hardware costs and complexity.
Innovation Solution
A method and apparatus for rendering perspective-correct images on multiple tilted displays by creating a common viewport for central and peripheral monitors, calculating scene data, rasterizing geometric primitives, and adjusting bitmaps based on the tilt angle to correct perspective distortion, using a single pass through a geometry engine to generate a projection that accounts for the tilt and distance from the camera.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple displays are arranged horizontally to widen field of view, then the field of view is expanded, but perspective distortion is greatly amplified
Solution Approach 1:
The rendering process is segmented into multiple passes: a first pass generates a preliminary image without perspective correction, and a second pass applies perspective correction specifically to peripheral regions. This segmentation allows the system to maintain wide field of view while correcting distortion in specific areas where it matters most.
Solution Approach 2:
Perspective correction is applied selectively to different regions of the display with different intensities. Peripheral regions that exhibit more distortion receive stronger correction, while central regions receive minimal or no correction. This local quality approach ensures distortion correction where needed without degrading image quality in regions that already display well.
2Manufacturing precision
If a discreet graphics processing unit is used for each display to correct perspective distortion, then image quality is improved, but hardware cost and complexity increase
Solution Approach 1:
Multiple rendering operations are merged into a single unified rendering process. Instead of using separate GPUs for each display, the invention combines perspective correction rendering with standard rendering into one integrated process that operates on a single GPU, reducing hardware requirements while maintaining image quality.
Solution Approach 2:
The invention creates a corrected version of the image by copying and transforming the preliminary rendered image. A perspective correction transform is applied to generate a corrected image that compensates for distortion, allowing high-quality output without requiring additional expensive hardware.
3Ease of operation
If peripheral displays are tilted inward to enhance user immersion, then user experience is improved, but perspective distortion is further exacerbated
Solution Approach 1:
The rendering system performs preliminary perspective correction calculations based on the known tilt angles of peripheral displays. By pre-calculating the appropriate perspective transforms according to the display geometry, the system can compensate for the tilted configuration before rendering, ensuring that images appear correct even when displays are tilted to enhance immersion.
Data Source
AI summary
Techniques for rendering images on multiple tilted displays concurrently to mitigate perspective distortion are disclosed herein. According to one described approach, viewports are assigned to a center monitor and two peripheral monitors. Scene data for the viewports is calculated, and geometric primitives are generated for the viewports based on the scene data. Image transformation is performed based on a modified perspective value to modify geometry of the geometric primitives based on tilt angles of the displays, and the geometric primitives are rasterized using the modified geometry.