Structured Light Source Array for Self-Calibration and Dense Projection
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Solution Overview
Problem
Calibration of structured light systems is complex and costly, requiring frequent recalibration throughout the product's life cycle, which affects the precision and accuracy of the system's output.
Innovation Solution
A light source for structured light systems comprising a plurality of light source elements arranged in an array, capable of operating in two modes: calibration mode, where only a part of the light source elements are driven, and normal mode, where the rest are driven, allowing for automatic partial recalibration without external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all light source elements are driven in normal mode for dense structured light reconstruction, then measurement precision is improved, but device complexity increases for calibration
Solution Approach 1:
The light source array is segmented into multiple independently controllable light source elements that can be selectively driven. The driving circuit includes multiple sub-driving circuits that can independently control different subsets of light source elements, enabling separate calibration patterns and normal operation patterns without requiring external calibration devices.
Solution Approach 2:
The system dynamically switches between different operational modes by controlling which light source elements are active. In calibration mode, only specific light source elements are driven to create simplified calibration patterns, while in normal mode, all light source elements are driven for dense structured light reconstruction, allowing adaptive adjustment of system complexity.
2Measurement precision
If calibration is performed throughout the product life cycle to maintain precision, then measurement precision is maintained, but loss of time and productivity increase
Solution Approach 1:
The system performs self-calibration by using its own light source elements to generate calibration patterns. The light source array can autonomously switch between calibration mode and normal operation mode, eliminating the need for external calibration devices and reducing calibration time while maintaining precision throughout the product life cycle.
Solution Approach 2:
The system incorporates calibration capability directly into the light source design, allowing calibration to be performed quickly using pre-defined patterns generated by specific light source elements. This preliminary preparation of calibration functionality enables rapid recalibration when needed without extensive setup time.
3Device complexity
If a single projector is used for both calibration and normal operation, then device complexity is reduced, but adaptability decreases for different operating modes
Solution Approach 1:
The single projector is designed with multi-functionality, where the same light source array serves both calibration and normal operation functions. The driving circuit includes multiple sub-driving circuits that can selectively activate different light source elements to generate different patterns, enabling one device to perform multiple functions without requiring separate calibration and operation projectors.
Solution Approach 2:
The projector dynamically adapts its operation by switching between different subsets of light source elements. The system can configure which light source elements are active based on the operational mode, providing flexibility in pattern generation while maintaining a single, simplified projector structure.
Data Source
AI summary
A light source for structured light, comprising a plurality of light source elements arranged in an array, wherein the light source elements are configured to be driven in the following two modes: —a calibration mode, wherein only a part of light source elements are adapted to be driven; and —a normal mode, wherein the rest of the light source elements are adapted to be driven.