Patent ID: 11060861

Abstract:
A method of measuring an uneven shape on a three-dimensional curved surface for measuring an uneven shape present on a three-dimensional curved surface of a measurement object and finer than the three-dimensional curved surface, the method comprising: a surface shape data acquiring step of acquiring three-dimensional surface shape data representative of a surface shape of the measurement object; a dividing step of extracting data of a divided portion representative of a surface contour shape of the divided portion from the three-dimensional surface shape data, for each of the divided portions acquired by dividing a surface of the measurement object in a certain dividing direction at regular intervals by a multiplicity of straight lines orthogonal to the dividing direction; a curve equation setting step of obtaining a curve equation approximating the entire area of the surface contour shape represented by the data of the divided portion for each of the divided portions; a difference calculation step of calculating a difference between the data of the divided portion and the curve equation for the entire area of the divided portion for each of the divided portions; and a difference combining step of combining two-dimensional data of the difference calculated for the entire area of the divided portion for each of the divided portions in the dividing direction to generate three-dimensional shape data representative of the uneven shape.