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Single-image space resection numerical calculation method

A technique of resection and numerical calculation, which is applied in complex mathematical operations, photo interpretation, etc., can solve the problems of inaccurate calculation results, slow calculation speed, poor stability, etc., and achieve simple calculation process, accurate calculation results and fast calculation speed Effect

Pending Publication Date: 2021-06-01
CHINESE ACAD OF SURVEYING & MAPPING
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AI Technical Summary

Problems solved by technology

However, the traditional single-image space resection calculation depends on the initial value, and the calculation process of the outer orientation element of the photo is relatively complicated, and there are problems such as slow calculation speed, inaccurate calculation results, and poor stability.

Method used

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  • Single-image space resection numerical calculation method
  • Single-image space resection numerical calculation method
  • Single-image space resection numerical calculation method

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Experimental program
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Embodiment

[0088] refer to figure 1 and figure 2 , a single image space resection numerical calculation method, comprising the following steps:

[0089] Select three control points that are not on the same straight line from the photo, namely point A, point B and point C; the three control points and the shooting point S form a pyramid and three shooting rays, and the three control points are in the three The image points on the photographic rays are a, b and c respectively; according to the principle that the apex angles of the three photographic rays are equal between the corresponding rays in the image space and the object space, a quadratic equation in three variables is constructed;

[0090] For ternary quadratic equations, use singular value decomposition to obtain three singular values. If there is a solution in the space resection, one of the three singular values ​​is zero, and the signs of the other two are opposite. Two groups of free variables t are obtained. Solution: Cal...

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Abstract

The invention provides a single-image space resection numerical calculation method, which comprises the following steps of: selecting three control points which are not on the same straight line from an image film, and constructing a ternary quadratic equation set according to the principle that vertex angles among corresponding light rays of three photographing light rays in an image space and an object space are equal; solving the undetermined values of the six exterior orientation elements in two steps, so that the position and attitude information of the shooting center of the shot image at the shooting moment can be determined. According to the method, the exterior orientation elements of the picture can be accurately estimated without providing any initial value, and the method is suitable for vertical photography, large-dip-angle photography and the like, and has the advantages of relatively simple and convenient calculation process, high calculation speed, accurate calculation result, stability, reliability and the like.

Description

technical field [0001] The invention relates to the technical field of photogrammetry, in particular to a single image space resection numerical calculation method. Background technique [0002] Spatial resection refers to the method of using three or more control points that are not on a straight line on the aerial photograph to calculate the outer orientation elements of the photograph according to the collinear equation. One of the basic theories, its goal is to determine the outer orientation elements of the camera through the global control points in the shooting space. The principle of spatial resection is the collinear conditional equation of the image. A camera with known internal parameters is used to capture several global control points with known coordinates in space, and then the collinear conditional constraint equation is established by combining the coordinates of the image point and the coordinates of the control point, namely It can solve the external para...

Claims

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Application Information

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IPC IPC(8): G06F17/12G06F17/16G01C11/04
CPCG06F17/12G06F17/16G01C11/04
Inventor 许彪孙钰珊王庆栋崔斌董友强王保前韩晓霞
Owner CHINESE ACAD OF SURVEYING & MAPPING
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