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1. (US20180328820) Method and apparatus for checking tyres for vehicle wheels

Office : United States of America
Application Number: 15776775 Application Date: 29.11.2016
Publication Number: 20180328820 Publication Date: 15.11.2018
Grant Number: 10175147 Grant Date: 08.01.2019
Publication Kind : B2
Prior PCT appl.: Application Number:PCTIB2016057184 ; Publication Number: Click to see the data
IPC:
G06K 9/32
G01M 17/02
G06T 7/66
G06T 7/70
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
K
RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
9
Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
20
Image acquisition
32
Aligning or centering of the image pick-up or image-field
G PHYSICS
01
MEASURING; TESTING
M
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
17
Testing of vehicles
007
of wheeled or endless-tracked vehicles
02
of tyres
[IPC code unknown for G06T 7/66][IPC code unknown for G06T 7/70]
CPC:
G01M 17/027
G06T 2207/10004
G06T 2207/30172
G06T 7/66
G06T 7/70
Applicants: PIRELLI TYRE S.P.A.
Inventors: Vincenzo Boffa
Luca Tersi
Valeriano Ballardini
Agents: Steinfl + Bruno LLP
Priority Data: UB2015A6028 30.11.2015 IT
Title: (EN) Method and apparatus for checking tyres for vehicle wheels
Abstract: front page image
(EN)

Method and apparatus for checking tires for vehicle wheels. A tire to be checked is fed to a checking station. A sidewall of the tire lies on a supporting portion of a rotating table. The supporting portion lies on a plane while the rotating table has a rotation axis perpendicular to the plane. A centring operation is carried out to align, in the plane, the rotation axis of the tire with the rotation axis of the rotating table. The centring operation includes identification, in the plane, of the rotation axis of the tire by: a) acquisition of an image of the tire laid on the supporting portion of the rotating table; b) definition, in the acquired image, of a number of analysis directions intersecting at one selected central point; c) for each analysis direction: c1) definition, in the acquired image, of a number of potential axes of symmetry, perpendicular to the analysis direction; c2) calculation of a level of symmetry of the image with respect to each potential axis of symmetry, where the level of symmetry is indicative of the probability that the center of the tire is on the respective potential axis of symmetry; c3) determination of a probability distribution indicative of a variation of the level of symmetry along the analysis direction; d) determination of a center of the tire on the basis of a cumulative probability distribution obtained through a combination of the probability distributions calculated for the analysis directions; e) identification of the rotation axis of the tire in an axis that passes through the determined center and perpendicular to the plane.


Also published as:
KR1020180088843EP3384267CN109073511BR112018010396WO/2017/093892