Patent ID: 7400702

Claim:
A tire inspection method for acquiring an image inside of a tire arranged between an electromagnetic radiation source and a camera at an opposed position said electromagnetic radiation source and inspecting an arrangement of a belt cord inside of said tire based on the acquired image; said method comprising steps of: arranging said electromagnetic radiation source at a first position apart from said tire, irradiating electromagnetic radiation rays from said electromagnetic radiation source to first and second points on said tire, respectively, and acquiring first and second coordinates on said camera, said first and second coordinates corresponding to said first and second points, respectively; moving said electromagnetic radiation source from said first position to a second position along with an axial direction, irradiating the electromagnetic radiation rays from said electromagnetic radiation source to said first and second points, respectively, and acquiring third and fourth coordinates on said camera, said third and fourth coordinates corresponding to said first and second points, respectively; finding a coordinate of said first point by finding an intersection of a straight line connected between said first point and said first coordinate and a straight line connected between said second point and said third coordinate, and finding a coordinate of said second point by finding an intersection of a straight line connected between said first position and said second coordinate and a straight line connected between said second position and said fourth coordinate; calculating a real distance between said first point and said second point based on the coordinates of said first and second points; and transforming a length between said first point and said second point on said image into a real distance between said first point and said second point.