3D Tire Model X-Ray Inspection Depth Recovery
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Solution Overview
Problem
Existing X-ray inspection systems for tires fail to accurately determine the location and distance of tire components like steel belts or cords due to the projection of three-dimensional objects onto two-dimensional images, leading to loss of depth information and inability to freely select measurement points, resulting in systematic measurement errors.
Innovation Solution
A method using a three-dimensional model of the tire to allocate pixels from two-dimensional X-ray line images to their corresponding locations in space, allowing for measurement along any desired section, including outside the calibration plane, and enabling accurate determination of distances and displacements between tire components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide-angle X-ray tube and U-shaped detector array are used to capture tire images, then the coverage area increases, but depth information and position accuracy are lost due to projection onto 2D images
Solution Approach 1:
The patent introduces a third dimension by creating a 3D model of the tire that corresponds to the 2D X-ray images. This 3D model contains depth information and allows measurement points to be selected in three-dimensional space, thereby recovering the depth information that was lost during the 2D projection process while maintaining the broad coverage capability of the wide-angle X-ray system
2Measurement precision
If geometric calibration is used to convert image coordinates to physical variables, then position information can be determined, but measurement points are constrained to a calibration plane and cannot be freely selected
Solution Approach 1:
The patent extends the measurement capability from a 2D calibration plane to a 3D space by introducing a 3D model of the tire. This model allows measurement points to be selected anywhere on the tire surface in three-dimensional space, not just on a fixed calibration plane, thereby providing both accurate position determination and free selection of measurement points
3Reliability
If X-ray line images are used for inspection, then the inspection system can visualize tire components, but systematic measurement errors occur due to complex imaging geometry
Solution Approach 1:
The patent introduces a 3D model as an intermediary between the 2D X-ray images and the physical tire. This 3D model serves as a mediator that translates image coordinates to accurate 3D positions, eliminating systematic measurement errors caused by the complex imaging geometry while preserving the visualization capability of the X-ray system
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 allows for precise measurement of horizontal and vertical distances, belt widths, and paired distances between cords, significantly reducing systematic measurement errors and enabling a broader range of measurement tasks with improved accuracy.
Implementation Method 1
Tires are X-rayed for checking with X-rays in order to visualize the belts or cords located in the tires
Data Source
AI summary
A method for checking the location of elements in a tire in an X-ray inspection system. The X-ray inspection system has an X-ray tube, a linear X-ray detector and a manipulator. The method includes: using a three-dimensional model of the tire, in which potential locations of the elements in the tire are described; recording two-dimensional X-ray line images of the tire elements consisting of pixels, which are described by a vector from the X-ray tube through the element to the X-ray detector; allocation of the pixels of an element from the two-dimensional X-ray line image to the three-dimensional model of the tire, in that the intersection point of a straight line through the X-ray tube with the vector of the pixel from the two-dimensional X-ray line image is assigned with the potential location of the element of the three-dimensional model as a point in the space for the pixel.