Patent ID: 7962303
Filing Date: 2011-06-14
Classification: B62D,G01B,G01N,G06T

Abstract:
1. A distortion evaluating apparatus for evaluating distortion based on three-dimensional measurement data obtained from a measurement object surface, the apparatus comprising: a quadratic differential component configured for effecting a quadratic differential operation on two-dimensional measurement data of a cross section of the measurement object surface indicative of unevenness therein, thus obtaining curvature data for each one of a plurality of cross sections over the measurement object surface three-dimensionally; a permissible range setting component configured for setting a permissible range for said curvature data, based on range of an upper limit value and a lower limit value from a reference value; a distortion data extracting component configured for extracting a portion of said curvature data of the plurality of cross sections, over the measurement object surface three-dimensionally, exceeding said set permissible range as distortion data indicative of the distortion in the cross section; a distortion length extracting component configured for extracting the length of a specific distorted region based on three-dimensional distortion data; a distortion volume extracting component configured for extracting the volume of said specific distorted region based on the three-dimensional distortion data; and a distortion degree evaluating component configured for evaluating the degree of distortion in the specific distorted region present in the measurement object surface by using the combination of the length and the volume of the specific distorted region as distortion evaluation data and comparing evaluation reference data and the distortion evaluation data with each other.