FIELD: measuring.
SUBSTANCE: invention relates to optical measurements of three-dimensional coordinates of objects in space, in particular to photo- and videogrammetry. Method of measuring spatial coordinates of points of an object with high longitudinal rigidity consists in the fact that reference points are placed on the surface of the object. Group of basic reference points is selected in the areas of the expected minimum deformation. Further, the initial three-dimensional coordinates of the reference points are determined, when the object is loaded, its image is fixed, on which the two-dimensional coordinates of the images of all reference points are determined, the desired three-dimensional coordinates of all reference points are found, wherein predicted values of three-dimensional coordinates of reference points are successively determined using preset geometrical connections and initial three-dimensional coordinates of reference points and/or found three-dimensional coordinates of reference points following basic reference points; predicted values of three-dimensional coordinates of each reference point are determined. Then, the three-dimensional coordinates are refined and the refinement result is taken as the resultant coordinates of the current reference point, wherein the direction vector v to the reference point centre in the coordinate system of the recording camera is calculated, pixel coordinates for the predicted mark from the reference point and the corresponding guide vector vpred are estimated, the angle δϕ between vectors vpred and v is calculated taking into account its sign, spatial coordinates correction vector ΔM is generated taking into account this angle and refined is the predicted spatial coordinate of the reference point by the formula M=Mpred+ΔM.
EFFECT: development of a procedure for updating predicted three-dimensional coordinates of a point, which is performed once in each cycle of measuring spatial coordinates, which does not include enumeration of all its possible positions inside the spatial element of the volume.
1 cl, 1 dwg
