3D Measurement Device Using Two-Fold Rotational Symmetrical Patterned Light
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Solution Overview
Problem
Existing three-dimensional measurement methods using structured light require significant computational resources for template matching, especially when using random dot patterns, and lack flexibility in projecting unit design.
Innovation Solution
A three-dimensional measurement method employing a two-fold rotational symmetrical patterned light, where the pattern is projected onto a measurement target, allowing for efficient calculation of three-dimensional positions using a diffractive optical element or mask, and enabling flexible design of the projecting unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a random dot pattern is used for three-dimensional measurement, then the measurement can be performed with structured light, but the amount of computation required for template matching increases significantly
Solution Approach 1:
The patent changes the pattern parameter from a random dot pattern to a two-fold rotational symmetrical pattern. This parameter change maintains the structured light measurement capability while significantly reducing template matching computation, as the symmetrical structure allows for more efficient pattern recognition and matching algorithms.
Solution Approach 2:
The patent introduces a specific symmetrical structure (two-fold rotational symmetry) that breaks the randomness of the dot pattern. This structured asymmetry provides unique orientation information that reduces computational complexity while maintaining measurement precision, as the symmetrical properties can be exploited for faster pattern matching.
2Ease of manufacture
If a conventional projecting unit design is used, then the structure is simple, but the flexibility and adaptability of the measurement system is limited
Solution Approach 1:
The patent segments the projecting unit into a light source and a separate pattern generation component (mask or diffractive optical element). This segmentation allows independent optimization of each component, maintaining manufacturing simplicity while enabling flexible pattern design through different mask or DOE configurations.
Solution Approach 2:
The patent introduces a mask or diffractive optical element as an intermediary between the light source and the measurement target. This intermediary component enables flexible pattern projection without complicating the overall system, as it can be easily replaced or adjusted to change the projected pattern while keeping the light source and other components unchanged.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces computational complexity and enhances the flexibility of the projecting unit design, achieving more effective and precise three-dimensional measurements with improved precision, wide field of view, and lower costs compared to existing methods.
Implementation Method 1
employing a two-fold rotational symmetrical patterned light, where the pattern is projected onto a measurement target, allowing for efficient calculation of three-dimensional positions using a diffractive optical element or mask
Implementation Method 2
capturing means for capturing the measurement target onto which the patterned light is projected
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
A three-dimensional measurement apparatus includes: projecting means for projecting, onto a measurement target, patterned light having a two-dimensionally coded pattern in which a plurality of types of words each having a different two-dimensional structure and being distinguishable from each other are two-dimensionally arranged; capturing means for capturing the measurement target onto which the patterned light is projected; and calculating means for calculating a three-dimensional position of a target pixel of the image from an image captured by the capturing means, and the two-dimensionally coded pattern is two-fold symmetrical. The two-dimensionally coded pattern is a pattern in which a predetermined word is repeated in the column direction for each column. It is preferable that a word in the k-th column from one end is a word obtained by rotating a word in the k-th column from the other end by 180°. Also, it is preferable that the projecting means generates patterned light using a diffractive optical element.