Patent ID: 8243290
Filing Date: 2012-08-14
Classification: B82Y,G01Q

Abstract:
1. A base point setting method for using a mapping analysis processing apparatus setting a base point to use surface analysis data, at a three-dimensional measurement surface which has an X-axis and a Y-axis in an X-Y plane with respect to a target surface and a measurement value axis Z extending perpendicularly to the X-Y plane at the intersection of the X-axis and the Y-axis and which specifies one measured value Z (x, y) for a position (x, y) on the target surface, the base point setting method comprising the steps of: setting parameters d and e such that the bottom of a hemisphere or semi-spheroid figure C [z≧0, f(x, y)=c{1−(x−d) subtracting the height of the figure C from a measured value Z at each position of the bottom of the figure C, and expressing the minimum value of the differences as l obtaining the height of the figure C at the position (x shifting the figure C throughout in a range in which the bottom of the figure C contains the position (x expressing the maximum value of the sums as L wherein the parameter a is the X dimension of the hemisphere or semi-spheroid of the figure C in the X-Y plane; the parameter b is the Y dimension of the hemisphere or semi-spheroid of the figure C in the X-Y plane; the parameter c is adjusted in accordance with the shape of the surface of profile of the hemisphere or semi-spheroid of the figure C along the axis Z; the parameters d and e represent the center of the bottom of the hemisphere or semi-spheroid of the figure C in the X-Y plane; and the mapping analysis processing apparatus processes these steps.