Digital close range photogrammetry method

Abstract

The invention belongs to the photography measurement field, in particular to a digital close-range photogrammetry, which comprises the steps: a rotary multiple reference line convergent photography can be implemented by a camera; the close-range shooting data can be processed so as to obtain precision data, which comprises the steps: the inner orientation element initial value is obtained; the matching and turning point is in full automatic; the matching method is that the inner image strip matching is implemented with the adjacent image strip matching crossways; a measuring area free net is built; the point measurement is controlled; the beam method balancing or self-checking beam method balancing is implemented; a dense matching can be implemented according to the precision close shot data so as to generate the three-dimensional point cloud; the three-dimensional visualization measurement analysis can be implemented based on the three-dimensional point cloud. The digital close-range photogrammetry has the advantages that: the field reference point quantity can be reduced and the field workload can be lowered by taking the obtained image from the rotary multiple reference line convergent photography as a whole to implement balancing; the matching precision and speed can be improved through the rotary multiple reference line convergent photography and corresponding matching craft, furthermore, the digital close-range photogrammetry can support full automatic process to the close-range image.

Description

technical field [0001] The invention belongs to the field of photogrammetry, in particular to a digital close-range photogrammetry method. Background technique [0002] Photogrammetry is a measurement work that uses photographic image information to determine the size, shape, nature, spatial position and relationship of objects. Among them, close-range photogrammetry generally belongs to the category of ground photogrammetry, and the shooting distance is generally within 100 meters. Measuring cameras and non-measuring cameras can be used, but non-measuring cameras usually need to be verified by a special laboratory. Although Digital Photogrammetry Workstation (DPW) has been widely used in close-range photogrammetry, there is no breakthrough in its theory. At present, the theoretical basis of most close-range photogrammetry methods is still based on the single-model operation method of direct linear transformation (DLT-Direct Linear Transformation), that is, the photography ...

AI Technical Summary

Problems solved by technology

However, due to the correlation between the direct linear transformation unknowns (11 unknowns), it often leads to the instability of the solution

Moreover, DLT has high requirements on the distribution of control points. When the distribution of control points is not ideal, ill-conditioned solutions are prone to occur, which affects the accuracy of the object-space solution of the undetermined points.

At the same time, this operation method requires a large number of field control points, which has low precision, low work efficiency and high labor intensity in actual engineering applications.

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