IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0197656
(2005-08-04)
|
등록번호 |
US-7257996
(2007-08-21)
|
발명자
/ 주소 |
- Hassler,Ulf
- Schmitt,Peter
- Kostka,Guenther
|
출원인 / 주소 |
- Fraunhofer Gesellschaft zur Foerderung der angewandten Forschung e.V.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
14 |
초록
▼
A surface of a body includes a structure bounded by edges and a substantially edge-free unevenness. The structure is considered a quality impairment and the unevenness a potential quality impairment. A device includes a means for generating a height representation of the surface including the struct
A surface of a body includes a structure bounded by edges and a substantially edge-free unevenness. The structure is considered a quality impairment and the unevenness a potential quality impairment. A device includes a means for generating a height representation of the surface including the structure and the unevenness. A means for calculating a variation representation calculates the variation for every point of the height so that a high variation is obtained at a boundary of the structure and a low variation is obtained at a boundary of the unevenness. A means for detecting regions that potentially affect quality detects when a variation magnitude is smaller than a predetermined variation threshold value. These regions are examined to exclude uncritical regions and to determine the actual number of regions that affect quality. Quality control is performed on vehicle tires having structures such as inscriptions, and which also have bulges or constrictions that are substantially edge-free and uneven.
대표청구항
▼
What is claimed is: 1. An apparatus for positioning a defective location of a tire at a predetermined rotation position of a mechanical rotation axis, on which the tire is mounted, comprising: a defect location detector for detecting a defect location of the tire by determining coordinates of the d
What is claimed is: 1. An apparatus for positioning a defective location of a tire at a predetermined rotation position of a mechanical rotation axis, on which the tire is mounted, comprising: a defect location detector for detecting a defect location of the tire by determining coordinates of the defect location, wherein the tire is turned about the mechanical rotation axis; a rotation detector connected to the defect location detector for detecting angular rotation coordinates of the tire before, after or during the rotation of the tire about the mechanical rotation axis, so that a direct relation between the coordinates of the defect location and the detected angular rotation coordinates is present; and a turner connected to said rotation detector for turning the tire about the mechanical rotation axis across an angular range which depends on the angular rotation coordinates of the tire and the coordinates of the defect location, so that the defect location of the tire is arranged at the predetermined rotation position of the mechanical rotation axis. 2. The apparatus of claim 1, in which the tire has a surface comprising a structure bounded by edges and a substantially edge-free unevenness, wherein the structure does not constitute a quality impairment, and wherein the unevenness constitutes a potential quality impairment, the defect location detector comprising: a height representation generator for generating a height representation of the surface, wherein the height representation of the surface includes the structure and the unevenness; a calculator for calculating a variation representation from the height representation, wherein the variation representation includes variations of a height representation, so that at a boundary of the structure a high variation is obtained, wherein at a boundary of the unevenness a low variation is obtained; and a region detector for detecting regions of the height representation comprising a variation whose magnitude is smaller than a predetermined variation threshold value, wherein the variation threshold value is lower than the high variation and greater than the low variation, so that potentially quality-affecting regions are obtained. 3. The apparatus according to claim 2, wherein the region detector is arranged to obtain only such regions as potentially quality-affecting whose height is larger than a predetermined detection threshold value. 4. The apparatus according to claim 2, further comprising: an examiner for examining the potentially quality-affecting regions of the height representation regarding a height or depth and/or area in order to detect a quality-affecting unevenness. 5. The apparatus according to claim 2, wherein the surface is torus-shaped and comprises a doming and, if applicable, a side wobble, wherein the means for generating a height representation of the surface comprises: a generator for generating a three-dimensional representation of the surface; a provider for providing a reference representation of the surface, wherein the reference representation reflects the surface without the structure and the unevenness; and a subtracter for subtracting the reference representation from the three-dimensional representation to obtain a planar height representation of the surface of the body. 6. The apparatus according to claim 4, wherein the examiner comprises: a filter for non-linear two-dimensional filtering of the potentially quality-affecting regions to detect artifacts or small regions as not being quality-affecting. 7. The apparatus according to claim 4, wherein the examiner is arranged to determine the areas of the potentially quality-affecting regions and to compare the determined areas to at least one predetermined area threshold, to classify the potentially quality-affecting ranges as not being quality-affecting, whose areas are smaller than the predetermined area threshold. 8. The apparatus according to claim 7, in which a predetermined area threshold for elevations and a predetermined area threshold for depressions is provided. 9. The apparatus according to claim 4, wherein the examiner is arranged to determine a proportional part of adjacent pixels for a potentially quality-affecting range, which comprises a variation which is in its magnitude larger or equal to the predetermined variation threshold value, and wherein the examiner is further arranged to compare the proportional part to a predetermined edge threshold value, wherein potentially quality-affecting regions with a proportional part larger than the edge threshold value are classified as not being quality-affecting. 10. The apparatus according to claim 4, wherein the examiner is further arranged to compare potentially quality-affecting regions to a predetermined height threshold value to classify the regions whose height is smaller than the predetermined height threshold value as not being quality-affecting regions. 11. The apparatus according to claim 4, wherein the examiner is arranged to calculate the areas of potentially quality-affecting regions and to classify the potentially quality-affecting regions as quality-affecting regions whose area is larger than a predetermined area threshold value. 12. The apparatus according to claim 5, wherein the provider for providing a reference representation is arranged to perform a long-range non-linear filtering of a three-dimensional representation of the body. 13. The apparatus according to claim 12, wherein the provider for providing a reference representation is arranged to eliminate in an iteration the potentially quality-affecting regions from the three-dimensional representation of the object, to obtain an incomplete three-dimensional representation and to interpolate the incomplete three-dimensional representation or to fit the same by an analytical function to obtain the reference representation of the surface. 14. The apparatus according to claim 2, wherein the height representation is an planar height representation. 15. The apparatus according to claim 2, wherein the height representation is a contour line of a track on the surface and wherein a potentially quality-affecting region is a section of the contour line. 16. The apparatus according to claim 2, wherein the structure comprises an inscription on the tire and the substantially edge-free unevenness includes a bulge or a constriction. 17. The apparatus according to claim 2, wherein the height representation generator for generating a height representation is further arranged to eliminate generated pixel artifacts in an image of the surface. 18. A method for positioning a defective location of a tire at a predetermined rotation position of a mechanical rotation axis, on which the tire is mourned, comprising the following steps: detecting a defect location of the tire by determining coordinates of the defect location while the tire is turned around its mechanical rotation axis; determining angular rotation coordinates of the tire before, after or during the rotation of the tire about the mechanical rotation axis during the step of detecting, so that a direct relation between the coordinates of the defect location and the determined angular rotation coordinates is present; and turning the tire about the mechanical rotation axis over an angular range using the angular rotation coordinates of the tire and the coordinates of the defect location, so that the defect location of the tire is arranged at the predetermined rotation position of the mechanical rotation axis.
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