US 2022/0009296 A1Published application

Tire surface image display method, and image processing device employed for image display thereof

AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

InventorsJumpei FUKUDA, Yasuhiro MATSUSHITA

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Abstract

A method for displaying an image of a surface of a tire includes: taking an image of a surface of a tire formed with a mark having a protrusion and a recess; acquiring waveform data from the taken image of the surface; creating a histogram from the waveform data; determining, based on the histogram, a first bin threshold to distinguish a surface luminance of the protrusion of the mark, and a second bin threshold to distinguish a surface luminance of the recess of the mark; and displaying the image of the surface of the tire including the mark on a screen by representing a region equal to or higher than the first bin threshold, a region lower than the first bin threshold and higher than the second bin threshold, and a region equal to or lower than the second bin threshold in the histogram in three attributes of color.

Claims20

Dependent claims

A method for displaying an image of a surface of a tire, comprising:

an image taking step of taking an image of a surface of a tire formed with a mark having a protrusion and a recess;
a waveform data acquisition step of acquiring, from the taken image of the surface, waveform data representing a relation between a specific position on the surface of the tire and a surface luminance at the specific position of the surface;
a histogram creation step of creating, from the waveform data, a histogram representing a relation between bins for surface luminance each set at a predetermined interval and respective frequencies in the bins;
a bin threshold determination step of determining, based on the histogram, a first bin threshold to separate a surface luminance of the protrusion of the mark from a surface luminance of the surface other than the protrusion, and a second bin threshold to separate a surface luminance of the recess of the mark from a surface luminance of the surface other than the recess;
and
an image display step of displaying the image of the surface of the tire including the mark on a screen by representing a region equal to or higher than the first bin threshold, a region lower than the first bin threshold and higher than the second bin threshold, and a region equal to or lower than the second bin threshold in the histogram in at least one of hue, saturation, and value.

3 more elements

An image processing device for displaying an image of a surface of a tire, comprising:

a waveform data acquisition part which acquires, from an image of a surface of a tire taken by an image taking part, waveform data representing a relation between a specific position on the surface of the tire and a surface luminance at the specific position, the surface being formed with a mark having a protrusion and a recess;
a histogram creation part which creates, from the waveform data, a histogram representing a relation between bins for surface luminance each set at a predetermined interval and respective frequencies in the bins;
a bin threshold determination part which determines, based on the histogram, a first bin threshold to separate a surface luminance of the protrusion of the mark from a surface luminance of the surface other than the protrusion, and a second bin threshold to separate a surface luminance of the recess of the mark from a surface luminance of the surface other than the recess;
and
an image display part which displays the image of the surface of the tire including the mark on a screen by representing a region equal to or higher than the first bin threshold, a region lower than the first bin threshold and higher than the second bin threshold, and a region equal to or lower than the second bin threshold in the histogram in at least one of hue, saturation, and value.

2 more elements

Dependencies are inferred from the claim text.