Wind Turbine Blade Imaging With 3D Reprojection Alignment
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Solution Overview
Problem
Existing camera-based inspection techniques for wind turbine rotor blades suffer from limited accuracy in image stitching, leading to significant errors in defect localization due to the large size and varying angles of the blades, resulting in costly delays during maintenance.
Innovation Solution
A method involving the use of camera metadata to generate a three-dimensional model of the rotor blade, followed by re-projecting images onto a common scale and angle using homograph matrices, allowing precise alignment and defect localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional image stitching techniques are used to capture the entire rotor blade surface, then the field of view can cover the large blade area, but the accuracy of defect localization deteriorates due to accumulated stitching errors
Solution Approach 1:
The patent creates a digital 3D copy of the rotor blade using point cloud data derived from camera metadata and geometric models. This virtual replica allows for precise defect localization without relying on error-prone image stitching, as the 3D model provides an accurate spatial reference framework that preserves dimensional relationships across the entire blade surface.
Solution Approach 2:
The patent transitions from 2D image stitching to 3D spatial modeling by utilizing camera position, orientation, and focal length metadata to construct a three-dimensional point cloud representation of the rotor blade. This dimensional elevation eliminates stitching errors by working in the spatial domain where geometric relationships are inherently preserved.
2Ease of operation
If a single camera position is used to image the rotor blade, then the imaging system is simpler to operate, but the resolution deteriorates because the camera must be far away to include the entire blade
Solution Approach 1:
The patent divides the rotor blade imaging task into multiple segments captured from different camera positions and angles. Each image captures a specific portion of the blade with high resolution, and the camera metadata (position, orientation, focal length) for each segment is stored and used to construct a comprehensive 3D model that integrates all segments accurately.
Solution Approach 2:
The patent replaces the mechanical complexity of moving the camera with automated metadata tracking and computational processing. The camera remains relatively stationary or moves along a defined path, while its position and orientation are continuously recorded by sensors (GPS, accelerometers, gyroscopes). This substitution of mechanical precision with computational processing simplifies the imaging system operation while maintaining high resolution through multi-position capture.
3Area of stationary object
If multiple images are captured from different angles to cover the entire rotor blade surface, then the coverage area improves, but the complexity of aligning and stitching images increases
Solution Approach 1:
The patent introduces a 3D point cloud model as an intermediary between multiple captured images and the final composite view. Instead of directly stitching 2D images, the system converts image data into 3D spatial points using camera metadata, then reconstructs the blade surface in three-dimensional space. This intermediary representation automatically handles alignment and perspective corrections, significantly reducing processing complexity compared to traditional image stitching methods.
Data Source
AI summary
A method of imaging a wind turbine rotor blade is provided, which method includes the steps of controlling a camera to capture a plurality of images, each image showing a part of the rotor blade surface; augmenting each image with geometry metadata; generating a three-dimensional model of the rotor blade from the image metadata; and re-projecting the images on the basis of the three-dimensional model to obtain a composite re-projection image of the rotor blade. Also provided is a wind turbine rotor blade imaging arrangement.