Abstract: A method for correcting annular rotating body's surface shape data in correcting three-dimensional shape data on annular rotating body's surface, a reference line is set along the surface to detect the annular rotating body, and then reference equiangular division points are set. The circumferential length of reference line is calculated from distance between adjacent reference equiangular division points, and a plurality of reference equidistant division points, which divide reference line into equal lengths, are set on reference line. Then interpolation points for correction of data on surface to be detected of annular rotating body are set at positions a preset distance apart in radial direction of rotating body from the reference equidistant division points. Three-dimensional shape data at interpolation points are calculated using the three-dimensional data to be corrected.

Abstract: A method and apparatus for accurately detecting the shape of a tire side by performing an image processing of removing a knurled region from the tire side. An actual image of a tire side having a knurled region obtained by a light-section method is Fourier-transformed into a Fourier-transformed image by a Fourier-transformed image creating unit of an image processing means. Cross-shaped peaks appearing discretely at predefined frequency intervals on a straight line in the Fourier-transformed image are identified as peaks attributable to the knurled region by a knurled component identifying unit. The cross-shaped peaks are removed from the Fourier-transformed image by a knurl component removing unit, and the Fourier-transformed image from which the peaks are removed is inverse-Fourier-transformed into an actual image by an inverse-Fourier-transforming unit. And the acceptability of the shape of the tire side is determined using the actual image.

Abstract: A method and apparatus for accurately detecting the shape of a tire side by performing an image processing of removing a knurled region from the tire side. An actual image of a tire side having a knurled region obtained by a light-section method is Fourier-transformed into a Fourier-transformed image by a Fourier-transformed image creating unit of an image processing means. Cross-shaped peaks appearing discretely at predefined frequency intervals on a straight line in the Fourier-transformed image are identified as peaks attributable to the knurled region by a knurled component identifying unit. The cross-shaped peaks are removed from the Fourier-transformed image by a knurl component removing unit, and the Fourier-transformed image from which the peaks are removed is inverse-Fourier-transformed into an actual image by an inverse-Fourier-transforming unit. And the acceptability of the shape of the tire side is determined using the actual image.