Photogrammetric methods and devices related thereto

Abstract

The inventions herein relate generally to improvements in photogrammetry and devices suitable for obtaining such improvements. Some embodiments use only a single passive image-capture device to obtain overlapping 2D images, where such images at least partially overlap with regard to at least one object of interest in a scene. Such images can be processed using methods incorporating structure from motion algorithms. Accurate 3D digital representations of the at least one object of interest can be obtained. Substantially accurate measurements and other useful information regarding the at least one object of interest are obtainable from the methodology herein.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Application No. 62 / 066,925, filed Oct. 22, 2014, entitled “Photogrammetric Methods and Devices Related Thereto,” the disclosure of which is incorporated in its entirety by this reference.FIELD OF THE INVENTION[0002]The inventions herein relate generally to improvements in photogrammetry and devices suitable for obtaining such improvements.BACKGROUND OF THE INVENTION[0003]Photogrammetry is the science of obtaining measurements from photographs, especially for recovering the exact or nearly-exact positions of surface points. While photogrammetry is emerging as a robust, non-contact technique to obtain measurements of objects, scenes, landscapes, etc., there are limitations to existing methods, some of which, for example, are set forth in the following few paragraphs.[0004]Accurate three-dimensional (3D) digital representations of objects can be obtained using methods that utilize active-s...

AI Technical Summary

Benefits of technology

[0006]It is possible to obtain accurate measurements from photographs by using multiple images of an object of interest. When placed in a 3D context (i.e., “multiple view geometry”), the three-dimensional points from an object of interest can be estimated from measurements from two or more photographic images taken from different positions. Corresponding points are identified on each image. A line of sight (or ray) can be constructed from the camera location to the point on the object. Triangulation allows determination of the 3D location of the point both in relation to the object's orientation in space, as well as with regard to that point's orientation and / or position in relation to other points.

Problems solved by technology

While photogrammetry is emerging as a robust, non-contact technique to obtain measurements of objects, scenes, landscapes, etc., there are limitations to existing methods, some of which, for example, are set forth in the following few paragraphs.

While often providing accurate image data, it is nonetheless cumbersome for users to have to add a clamp-on or other type of peripheral equipment to their mobile devices.

Existing passive photogrammetry methods—that is, methods that do not use structured light, lasers or the like but which, for example, utilize images captured by a camera from which to derive measurements, etc. can also be problematic to use.

Such stereo images generally have insufficient parallax for high-quality measurement when used to obtain data regarding distant objects (e.g., objects more than a few (about one to about five) meters away from the cameras).

Both of these techniques for guiding the user can be used to provide accurate visualization of the object of interest but are nonetheless cumbersome and prone to user error.

This calibration process is time consuming, currently requiring the user to generate a chessboard marker comprising a minimum number of images taken from different angles and distances with respect to the image-capture device, whereby more images will provide more accurate calibration.

Among other things, there is no disclosure in the '024 patent that sufficient detail about individual objects present in the scene can be obtained to allow specific parameters of such objects to be resolved in order to obtain accurate 3D digital representations suitable to provide measurements or the like.

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