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Close-range photogrammetry target positioning method and system with known camera station position

A technology of close-range photography and target positioning, applied in the direction of photo interpretation, etc., can solve the problems of complex data processing, slow operation progress, heavy workload, etc.

Active Publication Date: 2021-08-31
WUHAN UNIV
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Problems solved by technology

[0004] This method has a heavy workload, slow work progress, and more complicated post-data processing. The unknowns to be solved include the three-dimensional coordinates of the target point and the position and attitude of the camera (6 external orientation elements) when each photo is taken. Solved by Bundle Block Adjustment

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  • Close-range photogrammetry target positioning method and system with known camera station position
  • Close-range photogrammetry target positioning method and system with known camera station position
  • Close-range photogrammetry target positioning method and system with known camera station position

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Embodiment Construction

[0069] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0070] like figure 1 As shown, the embodiment of the present invention provides a close-range photogrammetry target positioning method with a known photographic position, which can realize target positioning without image control points, including the following steps:

[0071] Step 1. Obtain the three-dimensional coordinates of the camera station position;

[0072] During specific implementation, the three-dimensional coordinates of the shooting station during image shooting can be obtained through existing measurement methods.

[0073] The preferred implementation method adopted in the embodiment is to connect the photogrammetry camera and three total reflection prisms with a rigid body to ensure that the relative distance between the camera and the three prisms remains unchanged. The geometric distance of the prism is cal...

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Abstract

The invention provides a close-range photogrammetry target positioning method and a close-range photogrammetry target positioning system with a known photographing position. The method comprises the following steps: acquiring a three-dimensional coordinate of a camera station position, namely measuring and acquiring the three-dimensional coordinate of the camera station during image shooting; measuring two-dimensional coordinates of the shot target point image on the image; introducing a unit quaternion to construct a rotation matrix from an image space to an object space; obtaining an initial value of an object space three-dimensional coordinate in a relative orientation manner, carrying out differential calculation on a rotation matrix constructed by the unit quaternion, and establishing an error equation about the unit quaternion; and establishing a unit quaternion constraint condition equation and block adjustment with limited conditions, including performing iterative calculation by using an indirect adjustment method with limited conditions, and solving three-dimensional coordinates of a target point. According to the method, image control points do not need to be arranged, solving of unknown numbers of photography bases during block adjustment is reduced, the method is simple and easy to implement, the measurement speed is high, the operation time is shortened, and the measurement operation efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of photogrammetry and visual measurement geometric positioning, in particular to a method and system for locating a close-range photogrammetric target with a known camera station position. Background technique [0002] Obtaining the geometric position of the target is one of the key problems in photogrammetry and vision measurement. Its principle is mainly to use the camera to obtain the image of the measured object, and obtain the geometric and position information of the object after processing. The main advantages are non-contact, fast speed, simultaneous acquisition of many observation objects, and high precision. . It has been applied in many fields such as topographic survey, industrial survey, urban three-dimensional modeling, archaeology (ancient cultural relics, ancient buildings, etc.), biomedicine, etc. But its main defect is that the measurement targets constructed only by images are relative i...

Claims

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Application Information

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IPC IPC(8): G01C11/28G01C11/08
CPCG01C11/28G01C11/08
Inventor 付建红孟庆祥
Owner WUHAN UNIV
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