Line Scan Camera Structured Light Surface Measurement
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Solution Overview
Problem
Existing 3D measurement technologies face challenges with precision and speed when measuring large surfaces, particularly due to the need for multiple stop-and-go operations, which lead to delays, increased wear, and systematic measurement errors, especially in industrial applications with oscillating surfaces.
Innovation Solution
The method employs line scan cameras with structured illumination, allowing for continuous scanning and reconstruction of surfaces by analyzing chronological and spatial image data, enabling efficient measurement of structured and unstructured surfaces, including those with texture, and is suitable for continuous processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple measurement captures are performed one after another using matrix camera systems, then larger surfaces can be measured, but measurement time increases significantly due to stop-and-go operations
Solution Approach 1:
The patent implements continuous scanning measurement where the line scan camera moves continuously across the measurement object without stopping. The structured light pattern is projected continuously and the camera captures image lines continuously, eliminating the stop-and-go operations inherent in matrix camera systems. This allows measurement of large surfaces in a single continuous pass, dramatically reducing measurement time while maintaining the ability to capture large areas.
Solution Approach 2:
The patent segments the measurement process into sequential line scans rather than requiring complete frame captures. By using a line scan camera that captures one line at a time and stitching these lines together, the system can measure large surfaces by dividing them into multiple scan lines acquired in rapid succession, avoiding the need to stop between measurements.
2Measurement precision
If stop-and-go operations are used for each measurement capture, then measurement precision can be maintained, but mechanical wear increases and service life decreases
Solution Approach 1:
The continuous scanning operation eliminates repeated starting and stopping of mechanical components. The line scan camera and structured light system operate continuously throughout the measurement process, reducing mechanical wear on motors, bearings, and other moving parts. This increases the service life and reliability of the measurement system while maintaining precision through continuous stable operation.
3Area of stationary object
If multiple measurement captures are performed sequentially, then large surfaces can be covered, but downtime between captures increases
Solution Approach 1:
The system performs measurement without interruption by continuously scanning across the entire measurement area. The line scan camera moves continuously while capturing image lines that are buffered and processed, eliminating downtime between captures. This significantly improves productivity and measurement efficiency while still covering large surfaces.
4Measurement precision
If structured light with multiple patterns is used for high precision measurement, then measurement precision improves, but measurement time increases due to integration and reading time
Solution Approach 1:
The patent segments the structured light pattern into multiple vertical stripes that can be captured in a single continuous scan. Rather than requiring multiple complete frame captures with different patterns, the system projects striped patterns and captures them line-by-line in rapid succession, reducing integration time while maintaining precision through the segmented stripe analysis.
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 significantly reduces measurement time, minimizes downtime, and enhances precision, making it suitable for high-speed and high-precision imaging of large surfaces, including those with oscillations, and is more durable than traditional matrix camera systems.
Implementation Method 1
The surface is illuminated by structured light. The captured images are analyzed chronologically and/or spatially
Data Source
AI summary
The invention relates to a method for capturing images of a preferably structured surface of an object, using at least one line-scan camera for scanning the surface, wherein the surface is illuminated in a structured manner and wherein for reconstruction of the surface a time-oriented evaluation and/or spatial evaluation of acquired images is effected optionally taking into account a relative movement between the line-scan camera and the surface. Said method is carried out by a device for capturing images of a preferably structured surface of an object.