TIRE SHAPE INSPECTION METHOD AND TIRE SHAPE INSPECTION APPARATUS
First Claim
1. A tire shape inspection method that inspects a sidewall surface of an inspection tire for shape defects by using an image of a sidewall surface of a sample tire having uneven marks in the sidewall surface thereof, the tire shape inspection method comprising:
- a teaching operation process includinga mask image generating step of detecting boundary lines which are contours of the uneven marks in a sample original image which is a two-dimensional image of the sidewall surface of the sample tire, and generating a mask image showing positions of the boundary lines, anda height offset image generating step of removing, from the sample original image, regions corresponding to the positions of the boundary lines shown in the mask image, and generating a height offset image by expressing heights of the remaining regions using one or a plurality of offset values; and
an inspection operation process includinga subtraction processing step of subtracting the height offset image from an inspection image which is a two-dimensional image of the sidewall surface of the inspection tire, and removing boundary regions shown by the mask image, anda shape defect detecting step of inspecting the sidewall surface of the inspection tire for shape defects on the basis of an unevenness-removed image obtained as a result of the subtraction processing step,wherein the height offset image generating step generates, in the sample original image, an offset profile that approximates a base surface which is a sidewall surface having no uneven marks, extracts the uneven marks from the sample original image on the basis of the generated offset profile, and sets heights of the extracted uneven marks as the offset values.
1 Assignment
0 Petitions
Accused Products
Abstract
A tire shape inspection method executes the following steps: first, as a teaching operation step, boundary lines of the bulge and dent marks are detected in a sample source image of a sample tire, a mask image is generated which denotes the boundary lines, regions are removed from the sample source image which correspond to the boundary lines which are denoted in the mask image, and a height offset image is generated which represents the heights of the remaining regions with one or more offset values. Next, as an inspection operation step, the height offset image is subtracted from an inspection image of the inspection tire, the boundary regions which the mask image represents are removed, and, on the basis of the obtained bulge/dent removal image, shape defects of the sidewall surfaces of the inspection tire are inspected.
-
Citations
10 Claims
-
1. A tire shape inspection method that inspects a sidewall surface of an inspection tire for shape defects by using an image of a sidewall surface of a sample tire having uneven marks in the sidewall surface thereof, the tire shape inspection method comprising:
-
a teaching operation process including a mask image generating step of detecting boundary lines which are contours of the uneven marks in a sample original image which is a two-dimensional image of the sidewall surface of the sample tire, and generating a mask image showing positions of the boundary lines, and a height offset image generating step of removing, from the sample original image, regions corresponding to the positions of the boundary lines shown in the mask image, and generating a height offset image by expressing heights of the remaining regions using one or a plurality of offset values; and an inspection operation process including a subtraction processing step of subtracting the height offset image from an inspection image which is a two-dimensional image of the sidewall surface of the inspection tire, and removing boundary regions shown by the mask image, and a shape defect detecting step of inspecting the sidewall surface of the inspection tire for shape defects on the basis of an unevenness-removed image obtained as a result of the subtraction processing step, wherein the height offset image generating step generates, in the sample original image, an offset profile that approximates a base surface which is a sidewall surface having no uneven marks, extracts the uneven marks from the sample original image on the basis of the generated offset profile, and sets heights of the extracted uneven marks as the offset values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A tire shape inspection apparatus that inspects a sidewall surface of an inspection tire for shape defects by using an image of a sidewall surface of a sample tire having uneven marks in the sidewall surface thereof, the tire shape inspection apparatus comprising:
-
image pickup means for picking up a two-dimensional image of the sidewall surface; mask image generating means for detecting boundary lines which are contours of the uneven marks in a sample original image which is a two-dimensional image of the sidewall surface of the sample tire, and generating a mask image showing positions of the boundary lines; height offset image generating means for removing, from the sample original image, regions corresponding to the positions of the boundary lines shown in the mask image, and generating a height offset image by expressing heights of the remaining regions using one or a plurality of offset values; subtraction processing means for subtracting the height offset image from an inspection image which is a two-dimensional image of the sidewall surface of the inspection tire, and removing boundary regions shown by the mask image; and shape defect detecting means for inspecting the sidewall surface of the inspection tire for shape defects on the basis of an unevenness-removed image obtained as a result of the subtraction processing step, wherein the plurality of offset values are heights of the uneven marks obtained by generating, in the sample original image, an offset profile that approximates a base surface which is a sidewall surface having no uneven marks, and extracting the uneven marks from the sample original image on the basis of the generated offset profile. - View Dependent Claims (10)
-
Specification