Method for extracting land utilization landmark boundary outline on remote sensing image
A remote sensing image and boundary extraction technology, applied in the direction of using re-radiation, instruments, measuring devices, etc., can solve problems such as limiting the scope of application
Inactive Publication Date: 2012-07-11
WUHAN UNIV
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[0003] The dynamic contour method is a common method for object extraction when guided by existing GIS data, but it usually needs to divide the foreground and background, that is, only a single object can be evolved, which limits the scope of application of this method
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[0038] The technical solution of the present invention can adopt computer software technology to realize the automatic operation process. The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and the flow chart of the embodiments.
[0039] see figure 1 , the method for extracting the boundary of land use and features on the remote sensing image provided by the embodiment of the present invention includes the following steps:
[0040] Step 1, register the remote sensing images with GIS data.
[0041]Embodiment realization step 1 comprises the following steps:
[0042] Ⅰ. Select control points on images and GIS land use maps;
[0043] Ⅱ. According to the relationship between the control points, the coordinate transformation equation is established according to the geometric model, and then the geometric correction is performed.
[0044] The geometric model of registration can adopt RST model, polynomi...
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The invention relates to a method for extracting land utilization landmark boundary outline on a remote sensing image. The method comprises the following steps of: registering the remote sensing image with GIS (Geographic Information System) data, and establishing a corresponding relationship between outline nodes and a grid by taking a land utilization object boundary in GIS as an initial value for extracting the land utilization landmark boundary outline on the image; making a statistics on region information of the image in the grid, and obtaining a light spectrum gray level information statistic in the grid; establishing a grid energy minimization function, and importing obtained attribute into the grid energy function; moving any mode, counting whether the total grid energy can be reduced by position change of local nodes, changing the positions of the nodes if the total grid energy can be reduced by the position change of the local nodes, or keeping the positions of the nodes unchanged; and checking a distance between every two nodes, inserting a new node between the nodes which meets certain conditions, carrying out multistage evolution on the outline, and returning to the last step for continuous cycling before the cycle reaches certain conditions. The method disclosed by the invention realizes integrally optimal land utilization boundary characteristic extraction of the high-resolution remote sensing image on the basis of a dynamic outline method of minimum grid energy under the guidance of GIS data.
Description
technical field [0001] The invention belongs to the technical field of extraction of remote sensing features and relates to a method for extracting boundaries of land use features from remote sensing images. Background technique [0002] Automatic / semi-automatic extraction of ground objects from remote sensing images is one of the important contents of the application of remote sensing technology. It can assist workers in the identification of ground objects and targets, thereby avoiding a large number of tedious operations in manual extraction of ground objects; however, remote sensing images have a high degree of complexity. , these complexities such as lighting conditions, atmospheric transparency, texture changes of targets, and occlusions have caused difficulties in automatic target extraction from remote sensing images. The introduction of prior knowledge, especially past geographic information system (GIS) data can provide preset shape and location information for gro...
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Inventor 张晓东姚璜张煜
Owner WUHAN UNIV