초록 ▼

A method and apparatus for determining the spatial coordinates of a workpiece including: a precisely formed jig; a planar light source; an electronic imaging device adapted to view the intersection of the planar light with the jig and the workpiece; a video digitizer for sampling and digitizing outp

A method and apparatus for determining the spatial coordinates of a workpiece including: a precisely formed jig; a planar light source; an electronic imaging device adapted to view the intersection of the planar light with the jig and the workpiece; a video digitizer for sampling and digitizing output signals from the imaging device and in particular reference pulse signals representative of said intersections; digital logic circuitry for algebraically summing video samples to determine the centroid or geometric mean of the reference pulses; and a computer for calculating calibration parameters based on knowledge of the form of the jig and scans of the jig, and applying those calibration parameters to scans of the workpiece to calculate spatial coordinates of the workpiece. A method of determining the centroid of a sensed pulse signal including the steps of integrating the signal over a selected interval including the pulse by analog or digital means, integrating the result of the first integration in like manner and dividing result of the second integration by the result of the first integration.

대표청구항 ▼

A method for determining spatial coordinates of a workpiece, comprising the steps of: (a) illuminating said workpiece and a jig with a planar source of light, said jig inherently defining a geometric figure; (b) storing the dimensions of the geometric figure inherent in said jig; (c) electronically

A method for determining spatial coordinates of a workpiece, comprising the steps of: (a) illuminating said workpiece and a jig with a planar source of light, said jig inherently defining a geometric figure; (b) storing the dimensions of the geometric figure inherent in said jig; (c) electronically viewing the intersections of the planar source of light and said workpiece and jig from a location spaced apart from said workpiece, jig and source of light, said viewing location being at a known distance from said jig, and at a known angle relative to said planar source of light; (d) scanning electronic images formed by said electronic viewing along a plurality of horizontal lines, each line including a reference pulse corresponding to the point at which the planar light intersects and illuminates said workpiece or jig; (e) determining the centroid of the reference pulse on selected scan lines; (f) calculating calibration parameters using the geometric figure inherent in said jig; and (g) calculating the spatial coordinates of the workpiece using the centroid of the reference pulses, said calibration parameters, and the known distance from the viewing point to the jig.