Color Support Distortion Correction for Head Mount Displays
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Solution Overview
Problem
Head mount displays experience color shift due to lens distortion, leading to distorted images and color inaccuracies, particularly when displaying white pixels as RGB colors are shifted, affecting the quality of the observed image.
Innovation Solution
An image signal processing apparatus with multiple color support distortion correcting units that correct color distortion based on lens distortion characteristics, generating correction images by adjusting pixel values and applying correction reference signals to minimize color shift, and incorporating high-pass reduction processing to mitigate false light effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lens distortion correction is applied to each color channel independently, then color accuracy is improved, but color shift between different colors occurs due to different distortion characteristics
Solution Approach 1:
The patent divides the distortion correction process into separate processing paths for different color channels (R, G, B). Each color channel has its own distortion correction unit that applies specific distortion characteristics measured for that color, allowing independent optimization of correction for each wavelength while maintaining overall color accuracy.
Solution Approach 2:
The patent measures and stores different distortion characteristics (parameters) for each color channel (R, G, B) at multiple positions across the display panel. During operation, the appropriate distortion parameters are selected and applied based on the pixel position and color channel, enabling precise correction that accounts for wavelength-dependent distortion variations.
2Manufacturing precision
If distortion correction processing is performed for each color channel separately, then color-specific distortion is corrected, but processing complexity and computation time increase
Solution Approach 1:
The patent performs distortion characteristic measurements for each color channel in advance and stores the results in lookup tables or memory structures organized by pixel position and color channel. During actual display operation, the pre-measured distortion characteristics are retrieved and applied directly, avoiding the need for real-time calculation and reducing processing complexity while maintaining correction accuracy.
3Reliability
If multiple distortion correction units are used for different colors, then color shift is reduced, but device structure becomes more complex
Solution Approach 1:
The patent implements a universal distortion correction architecture where multiple distortion correction units share common functional components such as the display panel interface, control logic, and memory structure. Each color channel's distortion correction is achieved through software or configurable hardware parameters rather than completely separate physical systems, reducing overall device complexity while maintaining the ability to correct color-specific distortion.
Data Source
AI summary
Provided is an image signal processing apparatus including multiple color support distortion correcting units receiving a color signal of a correction target image, performing image distortion correction of a color based on a lens distortion characteristic and generating a correction image supporting the color. Each of the multiple color support distortion correcting units performs processing of receiving a reference signal indicating a pixel position in an input image applied to calculate a pixel value of an output correction image, and setting a pixel value of the pixel position indicated by the reference signal in the input image as an output pixel value.