Glazed Object Rendering Quality Using Hyperspectral Sky Images
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Solution Overview
Problem
Current rendering methods for glazed facades struggle with accurately rendering the outward appearance of glazed objects under varying daylight and viewing angles, as they fail to account for reflections from the sky and surrounding landscape, leading to inaccurate color matching and unrealistic variations.
Innovation Solution
A method using hyperspectral canopy hemispherical images of the real sky and synchronized images of the glazed object to create a physically based rendering model, allowing for accurate color difference assessment in a given color space, ensuring realistic rendering across different viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual color adjustment is performed to match reference photographs, then color accuracy may be improved, but the work complexity and time consumption increase significantly
Solution Approach 1:
The patent replaces manual mechanical color adjustment operations with an automated computer-based system. The system uses a camera to capture images of the glazed object under test conditions, automatically compares these images against reference images, and computes color differences using color space transformations. This substitution eliminates the need for manual visual assessment and adjustment, significantly reducing work complexity while maintaining or improving color accuracy through objective computational analysis.
2Quantity of substance
If reference photographs are taken at different times, then more reference data is available, but lighting conditions vary causing color inconsistencies
Solution Approach 1:
The patent addresses color inconsistencies from varying lighting conditions by implementing parameter normalization through color space transformation. The system transforms both reference images and test images into a standardized color space, applying color correction algorithms that compensate for differences in illumination conditions. This allows the system to reliably compare images taken at different times and lighting conditions, maintaining color consistency across multiple reference photographs without requiring them to be captured under identical conditions.
3Ease of operation
If color matching is performed without accounting for viewing angles, then the process is simpler, but rendering accuracy deteriorates for glazed surfaces
Solution Approach 1:
The patent segments the color assessment process into multiple viewing angle measurements. Instead of taking a single color measurement, the system captures images of the glazed object from multiple angles and performs separate color comparisons for each angle. This segmentation allows the system to account for the angle-dependent reflective properties of glazed surfaces, significantly improving rendering accuracy while maintaining process simplicity through automated multi-angle imaging and computation.
Data Source
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AI summary
A method for assessing the physically based simulation quality of a glazed objects, in particular glazing buildings or glazing vehicles. A hyperspectral canopy hemispherical image of a real sky at given daylight conditions and an image of glazed object, both synchronously acquired, are processed into a physically based rendering to evaluate the colour difference between glazing parts of a rendered representative glazed object and the glazed object of the provided image. An outstanding advantage is a realistic rendering of a glazed object by an accurate rendering of reflecting effects coming from the sky onto glazed parts whatever the viewing angles.