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RPC model forward transform method

A forward transformation and model technology, applied in the field of RPC model forward transformation, can solve the problem that iteration does not necessarily converge in the application of RPC model, and achieve the effect of overcoming the difficulty of convergence, improving reliability and realizing convenience.

Inactive Publication Date: 2008-01-09
WUHAN UNIV
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Problems solved by technology

[0026] The purpose of the present invention is to solve the deficiencies of the existing technology, and propose a brand-new forward transformation method based on the inverse transformation of the RPC model, which solves the bottleneck problem in the application of the RPC model that the iteration of the forward transformation of the current RPC model does not necessarily converge.

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Embodiment Construction

[0045] The present invention introduces the RPC model inverse transformation result into the RPC model forward transformation process for iterative transformation, which can be completed by computer programs during specific implementation, and the process can be seen in the accompanying drawings. The positive change process of the RPC model of the present invention comprises the following steps,

[0046] Step 1, set the elevation value D hei and RPC model parameters, set the latitude and longitude coordinates of the center point as (D lat_off ,D lon_off ), side length is D lat_scale and D lon_scale The ground rectangular area of ​​, where the latitude and longitude coordinates of the four corner points are

[0047] (D lat_off +D lat_scale / 2.0,D lon_off +D lon_scale / 2.0);

[0048] (D lat_off -D lat_scale / 2.0,D lon_off +D lon_scale / 2.0);

[0049] (D lat_off +D lat_scale / 2.0,D lon_off -D lon_scale / 2.0);

[0050] (D lat_off -D lat_scale / 2.0,D lon_off -...

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Abstract

This method leads the result of the counter conversion to the conversion process to iteratively convert. It includes steps of: (1) setting the altitude and the RPC model parameters, setting the land rectangle area (LRA); (2) calculating the pixel coordinate of four angle points and the center point of LRA; (3) calculating the simulation conversion coefficient; (4) calculating the near longitude / latitude coordinate (LC) corresponding with the test image point coordinate (IPC); (5) calculating the theory IPC and the remained difference (RD); (6) if RD is within the preset value (PV), outputting the near LC as the LC corresponding with the test IPC; (7) otherwise, regulating LRA, returning to iteration until RD is within PV. This scheme ensures to obtain accurate land point position under the limited condition presented by the image producer. It possesses significant meaning in the remote sensing image application area.

Description

technical field [0001] The invention belongs to the technical field of photography and imaging, and in particular relates to an RPC model forward transformation method. Background technique [0002] Since the rigorous imaging geometric model has high positioning accuracy, it has always been the first choice for photogrammetry. Satellite remote sensing image processing often requires the use of strict imaging geometric models. However, although some high-performance sensor systems have been commercialized, because the key technical parameters such as satellite platforms and payloads are the technical secrets of aerospace powers, the core information of high-resolution sensors and satellite orbit parameters have not been made public, such as IKONOS, etc. Satellites cannot be processed with strict imaging geometric models; at the same time, the diversification of sensor imaging methods also requires the generalization of the model for photogrammetry software, so that it is not ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/50G06T17/05
Inventor 张过刘佳莹马洪超
Owner WUHAN UNIV
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