To provide a discrimination method allowing for smooth determination whether or not a vehicle is mounted with winter tires.SOLUTION: The winter tire discrimination method comprises: an irradiation step of irradiating a tread surface of a tire 1 of a vehicle which passes through a prescribed travel path, with a light beam in an oblique B direction from outside of a passage region of the tire; a photographing step of using a high sensitivity photographing apparatus 21 to photograph the tread surface of the tire which is irradiated with the light beam, from a side C opposite to the light beam in the radiation step with the passage region of the tire interposed between the light beam in the radiation step and the side C, thereby generating a visible image; an image processing step of generating a brightness image based on the visible image acquired in the photographing step, smoothing the generated brightness image thereby generating a smoothed image (brightness distribution image), removing unevenness from the brightness image by differentiation thereby generating a differential brightness image; a determination step of detecting a congestion region of sipe from the brightness distribution of the differential brightness image acquired in the image processing step, and determining that the tire which is a photographing source of the differential brightness image in which congestion of sipe is detected, as a winter tire; and a notification step of notifying a user of the determination result obtained in the determination step thereby determining a winter tire.SELECTED DRAWING: Figure 11
【課題】冬用タイヤを装着した車両か否かの判別を円滑にできる判別方法を提供する。【解決手段】予め定められた走行路を通過する車両のタイヤ1のトレッド面に対し、タイヤの通過領域外から、光線を斜めBに照射し、照射ステップで光線が照射されたタイヤのトレッド面を、照射ステップの光線とは、タイヤの通過領域を挟んで反対側Cから高感度撮影装置21で撮影し、可視画像を生成し、撮影ステップで得られた可視画像から輝度画像を生成し、生成された輝度画像を平滑化して、平滑化画像(輝度分布画像)を生成し、輝度画像から、平滑化画像を差分してムラを除去し、差分輝度画像を生成し、画像処理ステップで得られた差分輝度画像の輝度分布からサイプの密集領域を検出し、サイプの密集が検出された差分輝度画像の撮影元となったタイヤを冬用タイヤとして判定し、判定ステップによって得られた判定結果を通知することにより冬用タイヤを判別する。【選択図】図11
WINTER TIRE DISCRIMINATION METHOD
冬用タイヤの判別方法
2019-08-22
Patent
Elektronische Ressource
Japanisch
IPC: | G01N Untersuchen oder Analysieren von Stoffen durch Bestimmen ihrer chemischen oder physikalischen Eigenschaften , INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES / B60C VEHICLE TYRES , Fahrzeugreifen / G01B MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS , Messen der Länge, der Dicke oder ähnlicher linearer Abmessungen |
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