Pattern Light Control for Real-Time Object Positioning
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Solution Overview
Problem
Conventional measurement methods require multiple imaging operations to acquire information about the environment and object features, making them inefficient for real-time position and orientation measurements of objects.
Innovation Solution
A measurement device that simultaneously acquires image features and distance images by adjusting the pattern light characteristics based on the distribution characteristics of the object's image features, using a combination of pattern light for image feature extraction and distance measurement, allowing for real-time position and orientation calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple imaging operations are used to acquire environment information and object features, then measurement completeness is improved, but measurement time increases
Solution Approach 1:
The patent combines image feature extraction and distance measurement into a single imaging operation by projecting composite pattern light that contains both coding information for depth calculation and texture information for feature extraction, eliminating the need for separate imaging operations and reducing measurement time while maintaining completeness
Solution Approach 2:
The projected pattern light serves multiple functions simultaneously: it enables distance measurement through coding pattern recognition, provides texture information for image feature extraction, and illuminates the object for environmental matching, allowing one imaging operation to accomplish multiple measurement goals
2Ease of operation
If uniform illumination light is used, then image feature extraction is simplified, but distance measurement capability is reduced
Solution Approach 1:
The illumination light has different local characteristics: certain regions contain coding patterns for distance measurement while other regions provide uniform texture information for feature extraction, allowing each region to be optimized for its specific measurement function
Solution Approach 2:
The illumination light is constructed as a composite pattern combining coding patterns (for distance measurement) and uniform texture patterns (for feature extraction), similar to composite materials that combine different properties to achieve multiple functions simultaneously
3Measurement precision
If pattern light for distance measurement is used, then depth information is improved, but image feature extraction becomes difficult
Solution Approach 1:
The pattern light is segmented into different functional components: coding patterns for depth measurement and uniform texture patterns for feature extraction, with each segment serving its specific purpose without interfering with the other
Solution Approach 2:
The pattern light combines coding patterns and uniform texture patterns in a composite structure, allowing both depth information and image feature information to be extracted from the same illumination without one compromising the other
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
Enables efficient and accurate real-time measurement of object position and orientation by combining image feature extraction and distance data in a single imaging operation, matching the actual environmental conditions.
Implementation Method 1
measuring the reflected light when the measurement object is irradiated with the illumination light
Data Source
AI summary
A measurement device includes a pattern light characteristic setting unit configured to set illumination light having a pattern light characteristic to be projected onto a measurement object, a reflected light measurement unit configured to measure reflected light when the measurement object is irradiated with the illumination light on, an image feature extraction unit configured to extract from the measured reflected light an image feature based on a physical characteristic of the measurement object, a feature distribution calculation unit configured to calculate a distribution characteristic for each local region of the image feature, and a pattern light control unit configured to control the pattern light characteristic of the illumination light, which includes a pattern light characteristic for distance measurement and a pattern light characteristic for image feature extraction, based on the calculated distribution characteristic for each local region.