Image Processing Apparatus SVBRDF Texture Fidelity
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Solution Overview
Problem
Conventional image processing techniques for reproducing spatially varying bidirectional reflectance distribution function (SVBRDF) fail to accurately capture the reflection characteristics of materials like velvet and metal, leading to loss of texture fidelity in printed objects due to inadequate consideration of angular dependencies in reflectance changes.
Innovation Solution
An image processing apparatus that calculates statistical amounts of reflection characteristics for predetermined areas and generates arrangement data for printing materials on a recording medium, focusing on specific angular dependencies to enhance texture reproduction fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If whole optimization is performed to reduce the difference from SVBRDF regardless of elevation angle direction or azimuth angle direction, then the overall approximation error is reduced, but the characteristic reflectance change in the elevation angle direction is insufficiently reproduced due to the influence of reflectance in the azimuth angle direction
Solution Approach 1:
The patent segments the optimization process into two distinct stages: first optimizing for elevation angle direction to capture characteristic reflectance changes, then optimizing for azimuth angle direction. This segmentation allows each optimization to focus on specific angular characteristics rather than treating all directions equally, thereby preserving material texture features while achieving accurate SVBRDF approximation
Solution Approach 2:
The patent applies different optimization strategies to different angular directions based on their specific characteristics. The elevation angle optimization focuses on capturing characteristic reflectance changes essential for material identification, while the azimuth angle optimization handles the remaining variation. This local quality approach ensures that each direction is optimized according to its specific requirements rather than applying a uniform optimization method
2Reliability
If conventional SVBRDF reproduction techniques are used, then the reflection characteristics are reproduced, but the characteristic texture of target material is lost in the printed object
Solution Approach 1:
The patent performs preliminary optimization for elevation angle direction before azimuth angle optimization. By first establishing the characteristic reflectance profile in the elevation direction, the method ensures that essential material features are captured early in the process. This preliminary action prevents loss of characteristic texture that would occur if azimuth optimization were performed first or simultaneously without regard for elevation characteristics
Data Source
AI summary
An image processing apparatus includes an acquisition unit configured to acquire image data including reflection characteristics information indicating reflection characteristics of a material with respect to incident light; a calculation unit configured to calculate, from reflection characteristics indicated by the reflection characteristics information corresponding to each pixel included in an area of a predetermined size in an image indicated by the image data, a statistical amount indicating the reflection characteristics of the area with the predetermined size; and a generation unit configured to generate arrangement data representing an arrangement of a structure including a printing material on a recording medium, based on the statistical amount.