Head-Up Display Perspective Tiling for Distortion Correction
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Solution Overview
Problem
Existing display systems in vehicles, such as head-up displays, face challenges in presenting undistorted images due to the curvature of optical elements and non-vertical viewing angles, leading to suboptimal driver information visibility and safety.
Innovation Solution
A method involving the division of rendered or captured image content into tiles, which undergo perspective transformation and are then reassembled to correct distortions, allowing for modular and efficient processing, reducing computational load and enhancing frame rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image content is transformed as a whole by a graphics module, then the transformation can compensate for distortion caused by curved optical elements and windshield, but the transformation is computationally intensive and reduces frame rates
Solution Approach 1:
The patent divides the image content into multiple tiles before transformation. Each tile is transformed separately by the graphics module, which reduces the computational complexity compared to transforming the entire image as a single unit. This segmentation approach maintains the necessary distortion correction while enabling parallel processing of multiple smaller tiles, thereby improving frame rates.
2Manufacturing precision
If the transformation is adapted to changes in beam path by adjusting the projection surface position, then the image can remain undistorted, but the transformation parameters must be continuously recalculated
Solution Approach 1:
The patent pre-calculates transformation parameters for multiple possible beam path configurations and stores them in a lookup table. When the beam path changes, the system quickly retrieves the appropriate pre-calculated parameters instead of performing time-consuming real-time recalculation. This preliminary preparation maintains image undistortion while significantly reducing the time penalty associated with adaptation.
3Productivity
If the image content is divided into tiles for separate transformation, then the computational load is reduced and frame rates improve, but the processing complexity increases
Solution Approach 1:
The patent introduces a tile management intermediary layer that handles the division, transformation, and reassembly of image tiles. This intermediary structure organizes the complex processing into manageable stages: tiling the original image, transforming each tile independently using standardized parameters, and reassembling the transformed tiles into the final corrected image. This modular approach reduces overall processing complexity while maintaining high frame rates.
Data Source
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AI summary
The invention relates to a method, a head-up display and a display system for the perspective transformation and outputting of rendered or captured image content as well as to a corresponding vehicle comprising a head-up display or display system of said type. In the perspective transformation and outputting method, the image content to be displayed is subdivided into a plurality of tiles, and the individual tiles are each transformed in perspective using perspective transformation. The individual tiles that have been transformed in perspective are then combined to form a transformed image content, and the image content transformed in perspective is projected onto a projection area of the head-up display or displayed on a display unit.