Glazed Object Rendering Using Hyperspectral Sky Reflection Matching
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Solution Overview
Problem
Current rendering methods for glazed facades struggle with accurately representing the outward appearance of glazed objects under varying daylight conditions and viewing angles, leading to inaccurate color representations due to discrepancies in lighting conditions and sky reflections, which can deceive customers.
Innovation Solution
A method using hyperspectral canopy hemispherical images of the real sky and synchronized images of glazed objects to create a physically based rendering system, allowing for accurate color matching and realistic rendering of glazed objects by calculating color differences in a given color space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual color adjustment steps are used to match building material colors to calibrated photographs, then color accuracy is improved, but the complexity of the rendering process increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing color profiles of building materials under various lighting conditions before the actual rendering process. This allows the rendering system to directly retrieve and apply appropriate color values without requiring manual adjustment steps during the rendering process, thereby maintaining color accuracy while reducing process complexity
Solution Approach 2:
The patent introduces an intermediary color profile database that mediates between the lighting conditions and the final rendered colors. This intermediary layer automatically matches lighting conditions with corresponding color profiles, eliminating the need for manual color adjustment while ensuring accurate color representation
2Reliability
If reference photographs are used to adjust color and brightness of building materials, then realistic rendering is improved, but the reliability decreases when lighting conditions vary between photograph capture and rendering
Solution Approach 1:
The patent applies parameter changes by using lighting condition parameters (such as illuminant type, intensity, and spectral power distribution) to dynamically select and adjust color profiles. Instead of relying on static reference photographs, the system changes color parameters based on the actual lighting conditions in the rendering scene, ensuring both reliability and color accuracy across varying conditions
Solution Approach 2:
The patent introduces dynamics by making the color adjustment process adaptive rather than static. The system continuously adjusts material colors based on the lighting conditions present in the rendered scene, allowing the rendering to maintain consistency and accuracy regardless of when or under what conditions the reference photographs were captured
3Measurement precision
If hyperspectral canopy hemispherical images are used to capture real sky conditions, then the accuracy of sky reflection rendering is improved, but the complexity of data processing increases
Solution Approach 1:
The patent applies taking out by extracting only the essential sky reflection characteristics from the hyperspectral canopy hemispherical images. Instead of processing the entire hyperspectral data cube, the system extracts key parameters such as sky radiance distribution and spectral composition, which are then used to illuminate the rendered scene. This extraction approach maintains sky reflection accuracy while significantly reducing data processing complexity
Data Source
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.