Optical Position Recognition for 3D Object Measurement
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Solution Overview
Problem
Conventional three-dimensional measurement systems face limitations in correlating data from multiple measurements of large objects due to a small field of view, requiring mechanical or optical registration techniques that are not always optimal, and calibration patterns are not sufficient for accurate position recognition.
Innovation Solution
The system employs optical position recognition techniques to correlate measurement data by using an optical coding pattern with unique features, allowing partial image data to determine spatial characteristics and orientation, enabling the creation of composite three-dimensional representations of objects even when the field of view is smaller than the object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional mechanical registration techniques are used to correlate data from multiple measurements, then the system can obtain composite three-dimensional representations of large objects, but the object holder can only be placed in predetermined locations that are not optimal for acquiring three-dimensional data
Solution Approach 1:
The patent replaces mechanical registration techniques with optical position recognition. Instead of using a mechanical grid system that constrains object holder positions to predetermined locations, the system uses an optical camera to capture images of optical markers attached to the object holder. The positions and orientations are determined through image processing and coordinate transformations, allowing flexible positioning while maintaining measurement precision.
2Reliability
If conventional optical registration techniques are used with reference position markers, then frame data can be correlated, but the camera must continuously view the reference markers which may be obscured by the object during measurements
Solution Approach 1:
The patent attaches optical markers to the bottom surface of the object holder, placing them in a different spatial dimension relative to the measurement process. The camera captures images of these markers through the transparent slide from below, allowing the markers to remain visible and accessible for position recognition without being obscured by the object being measured on top of the holder.
3Manufacturing precision
If the measuring field is smaller than the object volume, then detailed measurements can be obtained, but multiple measurements of different portions are required and the data must be correlated
Solution Approach 1:
The patent introduces optical markers as intermediary reference elements that facilitate data correlation. These markers provide known spatial coordinates that serve as common reference points across multiple measurement frames. By tracking the positions and orientations of these markers in different views, the system can accurately correlate measurement data from multiple portions of the object without requiring complex registration procedures.
Data Source
AI summary
A system, apparatus, method, and computer program product for evaluating an object disposed on an upper surface of an object holder. At least one first frame representing a captured portion of the object is acquired, while the object holder is positioned at each of multiple locations. At least one second frame representing a captured portion of at least one other surface of the object holder is acquired, while the object holder is positioned at each of the locations. At least one spatial characteristic associated with the captured portion of the object is determined based on at least one of the acquired frames. Values of multiple optical markers captured in each second frame are determined, where at least two of the optical markers have different characteristics. At least one of coordinates associated with the values and an orientation of the captured portion of the at least one other surface are determined.