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Large-breadth digital aerial surveying camera image splicing method based on DLT (Direct Linear Transformation) coefficients

A large-format, aerial camera technology, applied in the field of aerial photogrammetry, can solve the problems of unfavorable large-scale data splicing processing and large amount of calculation, and achieve the effect of fast processing, simple splicing method, and avoiding data calculation processing

Active Publication Date: 2013-10-23
CHINA TOPRS TECH
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Problems solved by technology

Existing platform calibration parameters need to calculate the rotation matrix through image plane transformation, so the amount of calculation is large, which is not conducive to large-scale data splicing processing

Method used

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  • Large-breadth digital aerial surveying camera image splicing method based on DLT (Direct Linear Transformation) coefficients
  • Large-breadth digital aerial surveying camera image splicing method based on DLT (Direct Linear Transformation) coefficients
  • Large-breadth digital aerial surveying camera image splicing method based on DLT (Direct Linear Transformation) coefficients

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Embodiment Construction

[0018] The present invention will be described in further detail below through specific implementation examples and in conjunction with the accompanying drawings.

[0019] see figure 1 , the embodiment of the present invention provides an image stitching method based on DLT coefficient large format digital aerial camera, comprising the following steps:

[0020] Step S100, exposing at the same time to obtain four sub-images;

[0021] Step S200, matching the connection points of the four sub-images in the cross-shaped overlapping area, and calculating the outer orientation element of each sub-image according to the connection points between the sub-images and the platform calibration initial value of each sub-image;

[0022] Step S300, according to the outer orientation elements of the four sub-images exposed at the same time, determine the relative positional relationship of the four cameras, and calculate the calibration parameters of the DLT platform according to the relativ...

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Abstract

The invention discloses a large-breadth digital aerial surveying camera image splicing method based on DLT (Direct Linear Transformation) coefficients. The method is mainly used for splicing sub-images of a large-breadth digital aerial surveying camera into a virtual image and comprises the following steps: exposing at the same moment to obtain four sub-images; carrying out connection point matching on the four sub-images in a cross-shaped overlapping region; calculating to obtain an outer orientation element of each sub-image according to connection points among the sub-images and an initial platform checking parameter of each sub-image; determining a relative position relation of four cameras according to the outer orientation elements of the four sub-images which are exposed at the same moment; calculating a DLT platform checking parameter according to the relative position relation; generating a spliced virtual image by the sub-images according to the DLT platform checking parameter. According to the large-breadth digital aerial surveying camera image splicing method based on the DLT coefficients, disclosed by the invention, the complicated data operation processing is avoided, so that the splicing method is simple and is good for the image splicing method to rapidly process.

Description

technical field [0001] The invention relates to the technical field of aerial photogrammetry, in particular to an image splicing method for a large-format digital aerial camera based on DLT coefficients. Background technique [0002] A practical digital aerial camera requires both high resolution and large format coverage. However, in the case of a certain image size, there is an inverse relationship between the spatial resolution of the image and the ground coverage, and an effective way to solve the contradiction between the two is to increase the image size. The small image format digital aerial camera has a small image size and a large amount of data, which increases the workload of post-processing, and the base-to-height ratio is small, which reduces the elevation accuracy. Compared with the single-array digital aerial camera, under the same aerial photography conditions (flight height and overlapping degree), the image size becomes larger, the baseline is elongated, t...

Claims

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Application Information

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IPC IPC(8): G01C11/04
Inventor 李英成刘晓龙丁晓波朱祥娥齐艳青
Owner CHINA TOPRS TECH
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