A method of target drop measurement based on building outline features

A technology of contour features and measurement methods, which is applied in the directions of measuring devices, photo interpretation, image analysis, etc., can solve the problems of relying on the marking points outside the ground, the difficulty of laying out the marking points, and the time-consuming preparation period, so as to reduce the difficulty of field construction, The effect of shortening the calculation time of the landing point and improving the efficiency of equipment use

Active Publication Date: 2022-08-09
中国人民解放军63660部队
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Problems solved by technology

[0005] The purpose of the present invention is to provide a target drop point measurement method based on building outline features to solve the technical problem that the drop point measurement of the external field environment is too dependent on the marker points outside the ground, and the layout of the marker points is difficult and the preparation period takes a long time.

Method used

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  • A method of target drop measurement based on building outline features
  • A method of target drop measurement based on building outline features
  • A method of target drop measurement based on building outline features

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Embodiment 1

[0067] In this example, the building is 36m long, 16m wide, the target length is Lm, the camera focal length is 50mm, the camera resolution is 1280×1024, the pixel size is 14μm, the camera frame rate is 500Hz, the flight platform is about 300m away from the expected landing point, and the target The falling velocity is about v m / s (part of the data is inconvenient to give, and is represented by letters). Implement the method disclosed by the present invention according to the following steps:

[0068] (1) If figure 1 , before the task starts, use the RTK inker to measure the coordinates of the three contour points of the building and the coordinates of the expected drop point to obtain the point coordinates, and the elevation of the selected contour measurement point is as close to the expected drop point elevation as possible;

[0069] (2) Using the field of view calculation formula, the camera field of view can be obtained as about 107m×86m, which can completely cover the t...

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Abstract

The invention relates to the technical field of drop point measurement, and provides a target drop point measurement method based on building outline features, which uses an RTK inker to measure building outline point coordinates and predicted drop point coordinates; Immediately stop the recording after the fire appears, and calculate the number of backward images n according to the movement time of the target in the camera's field of view and the frame rate of the camera; screen the target detection range by the frame difference method; combine the Otsu threshold segmentation algorithm to process the differential image , manually screen in sequence, select the key frame image of the moment when the target passes through the roof, and click on the image to select the position of the building outline point and the actual landing point of the target; The coordinates of the landing point; use the coordinate axis rotation formula to obtain the target landing point data in the shooting coordinate system. The present invention only needs to measure part of the existing contour points before the test, and does not need to carry out the work of marking point layout, which effectively reduces the difficulty of field construction.

Description

technical field [0001] The invention relates to the technical field of drop point measurement, in particular to a target drop point measurement method based on building outline features. Background technique [0002] The drop point offset is an important parameter to evaluate the performance of the equipment. In the drop point measurement test, the drop point offset data is an important reference index for judging the success of the test. [0003] At present, there are mainly two common landing point measurement methods. One is to complete the landing point measurement based on the binocular intersection of the ground field of view. In this method, the camera is arranged on the ground, and the marking points are arranged on the facade of the building and combined with the checkerboard. Complete the internal and external calibration of the camera, obtain the structural parameters, geometric position and attitude information of the camera, fit the falling trajectory through se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/136G06T7/70G01C11/04G01C25/00
CPCG06T7/0002G06T7/136G06T7/70G01C11/04G01C25/00
Inventor 赵梓年张永栋谷俊豪田野叶虎
Owner 中国人民解放军63660部队
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