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Real-time positioning method and device based on on-board control point library and storage medium

A technology of real-time positioning and control points, applied in geographic information databases, image data processing, special data processing applications, etc., can solve the problems of complex remote sensing application mode processing process, restrictions on the efficient and fast application of remote sensing data, and many links involved. Achieve the effect of solving the limited resources on the star, reducing the amount of data, and improving the processing speed

Pending Publication Date: 2021-03-16
中科星图空间技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing process of this remote sensing application mode that relies solely on ground processing is complex, involving many links, and the processing time can be several days or weeks, which seriously restricts the efficient and rapid application of remote sensing data.

Method used

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  • Real-time positioning method and device based on on-board control point library and storage medium
  • Real-time positioning method and device based on on-board control point library and storage medium
  • Real-time positioning method and device based on on-board control point library and storage medium

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Experimental program
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Effect test

Embodiment 1

[0044] The real-time positioning method based on the on-board control point library described in this embodiment includes reading the reference image data and extracting image feature points; processing the extracted feature point information and high-precision position information of feature points into control points; According to the range of longitude and latitude, it is stored in the database, and the control point database table of different regions is formed to form a control point library; according to the latitude and longitude range of the image to be matched, the control point data of the corresponding area is searched in the control point library, and then the control point is transferred using the matching algorithm. Stab on the image to be matched; optimize the geometric positioning model and image positioning based on the control point data after piercing.

[0045] Among them, such as figure 1 As shown, the construction process of the control point library speci...

Embodiment 2

[0072] On the basis of Embodiment 1, in another embodiment of the present disclosure, the on-orbit real-time high-precision positioning processing method based on the on-board control point library includes:

[0073] Image four-corner point coordinate calculation and initial RPC fitting: The image four-corner point coordinate calculation is mainly based on auxiliary data such as attitude, track, and travel time internal and external orientation elements, which are calculated using a single-chip positioning model, and then the input image is gridded according to a certain grid spacing , and then use the single-chip positioning model to calculate the coordinate information of each grid point, and finally fit the initial RPC parameters. The entire algorithm flow is as follows Figure 5 shown.

[0074] Such as Figure 6 Shown is an input image; Figure 7 It is the execution result of the algorithm for calculating the coordinates of the four corners of the image and fitting the i...

Embodiment 3

[0140] On the basis of Embodiment 2, in another specific embodiment of the present disclosure, image orthorectification processing is implemented by using an MPI-based multi-task distribution parallel processing mechanism.

[0141] The main steps of image orthorectification are as follows:

[0142] ① Calculation of output image range

[0143] Calculate the latitude and longitude coordinates of the four corner points of the output image according to the pixel coordinates (row and column numbers) of the four corner points of the input image and the refined RPC parameter information, and judge the maximum and minimum values ​​of the longitude and latitude of the output image in the longitude direction and latitude direction to obtain MaxLon, MinLon, MaxLat, MinLat, such as Figure 9 According to the specified resolution PixelSpacing, the length and width range of the output image can be calculated.

[0144] DstImgWidth=(MaxLon-MinLon) / PixelSpacing;

[0145] DstImgHeight=(MaxLa...

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Abstract

The invention discloses a real-time positioning method and device based on an on-board control point library and a storage medium, and belongs to the field of image information processing. The methodis characterized by comprising the following steps: reading reference image data and extracting image feature points; processing the extracted feature point information and the feature point high-precision position information into control points; dividing and storing the control points into a database according to longitude and latitude ranges to form control point database tables of different regions to form a control point library; searching control point data of a corresponding area in a control point library according to the longitude and latitude range of the to-be-matched image, and then using a matching algorithm to prick the control points to the to-be-matched image; and performing geometric positioning model optimization and image positioning based on the control point data afterthorn rotation. Image matching is carried out based on an on-board control point library, the problem that a super-large base map needs to be stored in traditional image matching is effectively avoided, meanwhile, time consumed for loading a reference image through a program and time consumed for extracting feature points of the reference image are saved, and the matching efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of image information processing, and in particular relates to a real-time positioning method, device and storage medium based on an on-board control point library. Background technique [0002] With the rapid development of the application scale of satellite remote sensing, the extensive expansion of the application field and the significant improvement of the application level, the application of satellite remote sensing is changing from scientific research and experimental applications mainly for scientific research and technical experiments to directly serving economic and social development and national security. Industrialization and large-scale application transformation. This transformation has put forward higher and higher requirements for the rapid response and high timeliness application of satellite remote sensing. If the timeliness requirements of traditional satellite remote sensing applications can be m...

Claims

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Application Information

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IPC IPC(8): G06T7/73G06F16/29G06T5/00
CPCG06T7/73G06F16/29G06T2207/10032G06T2207/20016G06T5/80
Inventor 王重阳王一张桂滨马亚斌胡国军吴琳雍宝虎许凯波赵莹芝杨彦通
Owner 中科星图空间技术有限公司
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