Projector-Space Compensation Filters for Screen Mottling
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Solution Overview
Problem
Visual displays in simulators suffer from brightness variations (mottling) due to non-uniform paint thickness and optical properties, which can distract users when high contrast is achieved, necessitating a method to adjust projected image brightness.
Innovation Solution
A method involving a processor that receives a captured image, applies a spatial frequency filter, determines a projector-space compensation filter to adjust brightness, and outputs it for projection, using a camera and projector to correct brightness inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optimized paint coating processes are used to produce better overall display contrast, then display contrast is improved, but mottling becomes visible and distracts users
Solution Approach 1:
The patent applies preliminary action by capturing an image of the screen with a camera, processing it through spatial frequency filtering to identify mottling patterns, and pre-computing a compensation filter before projection. This allows the system to anticipate and correct brightness variations before they affect the user experience during actual operation.
Solution Approach 2:
The patent converts the harmful effect of visible mottling into a benefit by using the captured screen image to generate a compensation filter. The spatial frequency analysis identifies the mottling patterns, and the inverse filter is designed to counteract these specific patterns, transforming the problem of visible non-uniformity into a solvable signal processing task that improves overall display quality.
2Object-affected harmful factors
If traditional displays with lower contrast are used, then mottling is not distracting to users, but display quality and visual impact are reduced
Solution Approach 1:
The patent implements feedback by capturing the actual screen output with a camera, analyzing the captured image to detect brightness variations and mottling patterns, and using this information to generate a compensation filter. This closed-loop approach allows the system to adapt to the specific characteristics of the display screen and correct issues in real-time, enabling high contrast displays without the distracting effects of mottling.
3Manufacturing precision
If robotic painting arms are used to ensure consistent paint application, then paint uniformity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical approach of using robotic painting arms with a digital signal processing solution. Instead of relying on complex mechanical systems to achieve paint uniformity, the system captures the screen image, applies spatial frequency filtering to identify non-uniformities, and generates a computational compensation filter. This substitutes mechanical precision requirements with algorithmic correction, simplifying the manufacturing process while achieving the same goal of uniform display appearance.
Data Source
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AI summary
A method for generating a digital filter for adjusting a brightness of a screen, the method being executed by a processor, the method comprising: receiving a captured image of a screen on which a reference image is projected by a projector, the captured image being captured by a camera; applying a spatial frequency filter to the captured image, thereby obtaining a spatially filtered image; determining a projector-space compensation filter based on the spatially filtered image, the projector-space compensation filter being configured for adjusting a brightness of the acquired image; and outputting the projector-space compensation filter.