Speckled Calibration Artifact for Photogrammetry Scanners
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Solution Overview
Problem
Conventional calibration artifacts lack visual texture, making them unsuitable for calibrating and certifying photogrammetry-based scanners, which require textured objects for accurate measurement.
Innovation Solution
A speckled calibration artifact with a geometric solid surface, such as a sphere, coated with a randomly applied contrasting color pattern to create a visually textured surface, enabling precise calibration and certification of metrology equipment, including photogrammetry-based scanners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional calibration artifacts (metallic or white ceramic) are used, then manufacturing precision and durability are improved, but visual texture is lost making them unsuitable for photogrammetry-based scanners
Solution Approach 1:
The calibration artifact combines a white ceramic base material with a speckled coating layer consisting of black and white particles. This composite structure provides both the durability and precision of ceramic materials and the visual texture required for photogrammetry-based scanning, resolving the contradiction between manufacturing precision and visual texture.
Solution Approach 2:
The artifact surface is modified by applying a speckled pattern of contrasting colors (black and white) to the white ceramic base. This color variation creates the necessary visual texture for photogrammetry scanners while maintaining the underlying ceramic material's precision and durability properties.
2Measurement precision
If polished metallic surfaces are used for touch probing equipment, then surface smoothness and measurement accuracy are improved, but visual texture for photogrammetry scanning is lost
Solution Approach 1:
The artifact uses a composite structure with white ceramic material providing the precise geometric form and a speckled coating providing visual texture. This allows the artifact to serve both touch probing applications (requiring smooth precision surfaces) and photogrammetry scanning (requiring visual texture).
Solution Approach 2:
The speckled coating is applied to the surface of the precision ceramic artifact, creating local visual texture variation while maintaining the overall geometric precision and smoothness required for measurement applications. Different regions of the artifact maintain different properties: the bulk material provides precision while the surface coating provides texture.
Data Source
AI summary
A speckled calibration artifact to calibrate metrology equipment is disclosed. A particular embodiment includes a geometric solid having a smooth outer surface of a solid base color; and a speckled contrasting color applied on the outer surface of the geometric solid in a randomly speckled pattern enabling portions of the solid base color and portions of the contrasting color to be visible on the smooth outer surface of the geometric solid.