CN117576433A - Method and system for extracting DTM data of mountain area power transmission corridor based on distribution algorithm - Google Patents
Method and system for extracting DTM data of mountain area power transmission corridor based on distribution algorithm Download PDFInfo
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Abstract
The invention discloses a method and a system for extracting DTM data of a mountain area power transmission corridor based on a distribution algorithm, wherein the method comprises the steps of obtaining image data of all areas of the mountain area power transmission corridor, preprocessing the image data, and obtaining the image data comprising image data of different time points and seasons; according to the preprocessed image data, combining a distribution algorithm to identify characteristics of a target object in a power transmission corridor and acquiring three-dimensional data of the target object; and carrying out feature point matching according to the recognized features and three-dimensional data of the target object in the power transmission corridor, and completing extraction of DTM data of the power transmission corridor in the mountain area according to the feature matching result. The method provides high-efficiency and high-precision topographic data for power system management and planning, is beneficial to improving the reliability, efficiency and sustainability of the power system, and reduces the cost and environmental impact. This technology has important strategic and economic value for the power industry.
Description
Technical Field
The invention relates to the technical field of extracting DTM data of a mountain area power transmission corridor, in particular to a method and a system for extracting DTM data of the mountain area power transmission corridor based on a distribution algorithm.
Background
The current state of the art generally relies on the processing of remote sensing data and Digital Elevation Model (DEM) generation using conventional mathematical and geographical information processing techniques. While effective, these methods may be limited by the quality and resolution of the telemetry data, especially in mountainous areas and complex terrain. The traditional method may be limited by data quality, is not suitable for complicated terrains such as mountain power transmission corridor, and for high-precision DTM data extraction, a large amount of manual intervention and complicated data processing flow may be required.
In recent years, although machine learning techniques have been widely used in the processing of topographic data. They can automatically learn the topographical features from the remote sensing data and generate DTMs. Machine learning methods typically require a large amount of labeled training data and may not be stable in performance in complex terrain. For certain topographical features, the machine learning model has limited interpretability, and it is difficult to understand the specific data extraction process.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above-described problems occurring in the prior art.
Therefore, the invention provides a method and a system for extracting DTM data of a mountain area power transmission corridor based on a distribution algorithm, which can solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme, and the method for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm comprises the following steps:
acquiring image data of all areas of a mountain area power transmission corridor, and preprocessing the image data, wherein the image data comprises image data of different time points and seasons;
according to the preprocessed image data, combining a distribution algorithm to identify characteristics of a target object in a power transmission corridor and acquiring three-dimensional data of the target object;
and carrying out feature point matching according to the recognized features and three-dimensional data of the target object in the power transmission corridor, and completing extraction of DTM data of the power transmission corridor in the mountain area according to the feature matching result.
As a preferable scheme of the method for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm, the invention comprises the following steps: the acquiring the image data of all areas of the mountain area power transmission corridor, and the preprocessing the image data comprises the following steps:
establishing a space rectangular coordinate system, and placing all areas of the mountain area power transmission corridor in a first diagram;
shooting ten pieces of image data of different mountain area power transmission corridors at different positions, same distances and fixed angles by using an image acquisition tool at will, calculating three-dimensional space coordinates of four vertexes of an upper vertex, a lower vertex, a left vertex and a right vertex of the obtained mountain area power transmission corridors, and calculating the average mountain area power transmission corridors image shooting size of the image acquisition tool;
presetting shooting lines of all areas of the mountain area power transmission corridor by combining a space rectangular coordinate system according to 80% of the image shooting size of the average mountain area power transmission corridor;
and acquiring image data of all areas of the mountain area power transmission corridor according to the preset shooting line.
As a preferable scheme of the method for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm, the invention comprises the following steps: the obtaining the image data of all areas of the mountain area power transmission corridor, and the preprocessing the image data further comprises:
performing geometric correction and radiation correction on the image data of all areas of the mountain area power transmission corridor;
the geometric correction comprises the steps of determining a conversion formula between corresponding points on an original input image of a mountain area power transmission corridor and corresponding points on an image after geometric correction by using a polynomial correction model, determining unknowns in the polynomial correction model according to control point data, judging the correctness of the polynomial correction model, and redesigning a new polynomial correction model when the correctness is judged to be incorrect;
the radiation correction comprises the steps of carrying out radiation correction on the mountain area power transmission corridor image data output after the geometric correction according to the mountain area power transmission corridor image data output after the geometric correction by combining the average inclined plane angles corresponding to mountain area positions of the corresponding mountain area power transmission corridor image, wherein the average inclined plane angles represent the average value of the inclined plane angles at the positions of the upper, lower, left and right vertexes of the image;
the radiation correction includes the steps of,
wherein f (i, j, l) is an image of a ground object on an inclined plane corresponding to the mountain position inclined plane angle a of the mountain power transmission corridor image, g (i, j, l) is a corrected image, and i, j, l represent coordinates corresponding to the center position of the image.
As a preferable scheme of the method for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm, the invention comprises the following steps: the steps of identifying the characteristics of the target object in the power transmission corridor according to the preprocessed image data and combining a distribution algorithm, and acquiring the three-dimensional data of the target object include:
for a certain pixel point (x, y) on the preprocessed image, a window W is designed to detect the change of the pixel value, and gradients Ix and Iy in two directions and a pixel value difference matrix M in the window are defined, then:
where w (x, y) is a weight function within the window, and the corner points are determined by calculating eigenvalues and response functions of the matrix M:
the response function is expressed as:
R＝det(M)-k·(trace(M)) 2
where k represents a constant for adjusting the magnitude of the response function R value.
As a preferable scheme of the method for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm, the invention comprises the following steps: the steps of identifying the characteristics of the target object in the power transmission corridor according to the preprocessed image data and combining a distribution algorithm, and acquiring the three-dimensional data of the target object further comprise:
when the response function value R is smaller than the first threshold value, preprocessing the image data again, and recalculating the response function value R;
if the recalculated response function value R is still smaller than the first threshold value, the following response function calculation formula is used for replacing the original response function;
where Ix and Iy represent gradients in both directions, k represents a constant for adjusting the magnitude of the response function R value, said lower threshold being determined by the average gradient value and the variance value.
As a preferable scheme of the method for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm, the invention comprises the following steps: the steps of identifying the characteristics of the target object in the power transmission corridor according to the preprocessed image data and combining a distribution algorithm, and acquiring the three-dimensional data of the target object further comprise:
when the response function value R is larger than the first threshold value, regarding the pixel point with the R value larger than the threshold value as a corner point;
after extracting the corner points, performing feature matching on the corner points among a plurality of preprocessed image data to determine the corresponding relation among different preprocessed images;
and converting the corner information into coordinate and attitude information in a three-dimensional space according to the feature matching result, and further reconstructing a three-dimensional model of the target object.
As a preferable scheme of the method for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm, the invention comprises the following steps: performing feature point matching according to the identified features and three-dimensional data of the target object in the power transmission corridor, and completing extraction of DTM data of the mountain power transmission corridor according to the feature matching result comprises the following steps:
extracting shape information and topographic features of the power transmission line from the matched feature points, converting the extracted data into a digital topographic model, integrating elevation data and topographic data of the power transmission line into the digital topographic model, and performing data smoothing and filtering treatment;
and outputting the generated digital terrain model to finish the extraction of the DTM data of the mountain area power transmission corridor, wherein the digital terrain model is generated by integrating a triangular grid generating algorithm and elevation data.
The system for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm is characterized by comprising the following steps: a data acquisition and preprocessing module, an algorithm combination module and a data extraction module,
the data acquisition and preprocessing module is used for acquiring image data of all areas of a mountain area power transmission corridor and preprocessing the image data, wherein the image data comprise image data of different time points and seasons;
the algorithm combination module is used for identifying the characteristics of the target object in the power transmission corridor according to the preprocessed image data and combining a cloth algorithm, and acquiring the three-dimensional data of the target object;
and the data extraction module is used for carrying out characteristic point matching according to the identified characteristics of the target object in the power transmission corridor and the three-dimensional data, and completing the extraction of the DTM data of the power transmission corridor in the mountain area according to the characteristic matching result.
A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method as described above when executing the computer program.
A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method as described above.
The invention has the beneficial effects that: the invention provides a method and a system for extracting DTM data of a mountain area power transmission corridor based on a distribution algorithm, which are used for acquiring image data of all areas of the mountain area power transmission corridor, preprocessing the image data, and acquiring image data of different time points and seasons; according to the preprocessed image data, combining a distribution algorithm to identify characteristics of a target object in a power transmission corridor and acquiring three-dimensional data of the target object; and carrying out feature point matching according to the recognized features and three-dimensional data of the target object in the power transmission corridor, and completing extraction of DTM data of the power transmission corridor in the mountain area according to the feature matching result. The method provides high-efficiency and high-precision topographic data for power system management and planning, is beneficial to improving the reliability, efficiency and sustainability of the power system, and reduces the cost and environmental impact. This technology has important strategic and economic value for the power industry.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a flowchart of a method and a system for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm according to an embodiment of the present invention;
fig. 2 is a triangle mesh generation DTM model of a method and a system for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm according to an embodiment of the present invention;
fig. 3 is an internal structure diagram of a computer device of a method and a system for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm according to an embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1-3, a first embodiment of the present invention provides a method and a system for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm, including:
acquiring image data of all areas of a mountain area power transmission corridor, and preprocessing the image data, wherein the image data comprise image data of different time points and seasons;
the method for acquiring the image data of all areas of the mountain area power transmission corridor and preprocessing the image data comprises the following steps:
establishing a space rectangular coordinate system, and placing all areas of a mountain area power transmission corridor in a first diagram;
further, the image acquisition tool is used for shooting ten pieces of image data of different mountain area power transmission corridors at different positions, same distances and fixed angles at random, three-dimensional space coordinates of the upper, lower, left and right vertexes of the obtained mountain area power transmission corridors are calculated, and the average mountain area power transmission corridors image shooting size of the image acquisition tool is calculated;
furthermore, the shooting line is preset for all areas of the mountain area power transmission corridor by combining a space rectangular coordinate system with 80% of the shooting size of the image of the average mountain area power transmission corridor;
in an alternative embodiment, the shooting line is preset for all areas of the mountain area power transmission corridor by 80% of the image shooting size of the average mountain area power transmission corridor and combining a space rectangular coordinate system, which may be a loop-shaped route, and may be from outside to inside, or from inside to outside, for example, when the center point of all areas of the mountain area power transmission corridor in the first trigram is selected as a route starting point, according to the size of 80% of the image shooting size of the average mountain area power transmission corridor, the center point is moved to the left by a size distance of 80% of the image shooting size of the average mountain area power transmission corridor, then moved downwards, then moved to the right, and so on until the shooting line is preset.
Furthermore, the image data of all areas of the mountain area power transmission corridor are acquired according to the preset shooting line.
Further, acquiring the image data of all areas of the mountain power transmission corridor, and preprocessing the image data further includes:
performing geometric correction and radiation correction on image data of all areas of a mountain area power transmission corridor;
it should be noted that geometric correction includes determining a transformation formula between a corresponding point on an original input image of a mountain power transmission corridor and a corresponding point on a geometrically corrected image by using a polynomial correction model, determining an unknown in the polynomial correction model according to control point data, judging the correctness of the polynomial correction model, and redesigning a new polynomial correction model when the polynomial correction model is judged to be incorrect;
the radiation correction comprises the steps of carrying out radiation correction on the mountain area power transmission corridor image data output after geometric correction according to mountain area power transmission corridor image data output after geometric correction by combining the average inclined plane angles corresponding to mountain area positions of the corresponding mountain area power transmission corridor images, wherein the average inclined plane angles represent the average value of the inclined plane angles of the positions of four peaks of the image;
the radiation correction includes the steps of,
wherein f (i, j, l) is an image of a ground object on an inclined plane corresponding to the mountain position inclined plane angle a of the mountain power transmission corridor image, g (i, j, l) is a corrected image, and i, j, l represent coordinates corresponding to the center position of the image.
In an alternative embodiment, an appropriate satellite or aeronautical system is selected to ensure that high resolution image data can be acquired. This may include satellite data acquisition tasks or aerial photography flights, planning the geographic location of the mountain power transmission corridor to determine the course of the satellite or aerial flight. Ensuring that the airlines can cover the entire transmission corridor, including major landmarks and topographical features. The data acquisition tasks are arranged to acquire image data at different points in time and seasons. The data under different seasons and illumination conditions are helpful for capturing the terrain variation and characteristics, and satellite remote sensing equipment or an aerial photography system is used for data acquisition. The parameter setting of the data acquisition equipment, such as resolution, spectrum range and the like, can be ensured, and related metadata, such as image shooting time, geographic coordinates, sensor parameters and the like, can be recorded in the data acquisition process according to the requirements of subsequent terrain extraction. The acquired image data is stored in a secure data storage device for subsequent processing. After data acquisition, the acquired images are subjected to preliminary quality control to check whether significant problems, such as image blurring, occlusion, or geometric problems, exist.
In an alternative embodiment, the cloud may also be automatically detected and excluded by a cloud detection algorithm using remote sensing image processing software, such as by using spectral features of the cloud. In addition, the images at different time points and angles are combined by adopting an image fusion technology, so that the influence of cloud layers and shielding is reduced.
Further, according to the preprocessed image data, identifying the characteristics of the target object in the power transmission corridor by combining a distribution algorithm, and acquiring three-dimensional data of the target object;
further, for a certain pixel point (x, y) on the preprocessed image, a window W is designed to detect the change of the pixel value, and gradients Ix and Iy in two directions and a pixel value difference matrix M in the window are defined, then:
where w (x, y) is a weight function within the window, and the corner points are determined by calculating eigenvalues and response functions of the matrix M:
the response function is expressed as:
R＝det(M)-k·(trace(M)) 2
where k represents a constant for adjusting the magnitude of the response function R value.
Further, when the response function value R is smaller than the first threshold value, preprocessing the image data again, and calculating the response function value R again;
if the recalculated response function value R is still smaller than the first threshold value, the following response function calculation formula is used for replacing the original response function;
where Ix and Iy represent gradients in both directions, k represents a constant for adjusting the magnitude of the response function R value, below a threshold value determined by the average gradient value and the variance value.
Further, when the response function value R is greater than the first threshold value, regarding the pixel point with the R value greater than the threshold value as the corner point;
after extracting the corner points, performing feature matching on the corner points among the plurality of preprocessed image data to determine the corresponding relation among different preprocessed images;
and converting the corner information into coordinate and attitude information in a three-dimensional space according to the feature matching result, and further reconstructing a three-dimensional model of the target object.
Furthermore, feature point matching is carried out according to the recognized features and three-dimensional data of the target object in the power transmission corridor, and the extraction of DTM data of the mountain area power transmission corridor is completed according to the feature matching result.
Further, shape information and topographic features of the power transmission line are extracted from the matched feature points, the extracted data are converted into a digital topographic model, elevation data and topographic data of the power transmission line are integrated into the digital topographic model, and data smoothing and filtering processing are performed;
further, the generated digital terrain model is output to finish the extraction of the DTM data of the mountain area power transmission corridor, wherein the digital terrain model is generated by integrating a triangular grid generation algorithm and elevation data.
In an alternative embodiment, extracting the shape information of the power transmission line may further include the operations of:
linear interpolation: and carrying out linear interpolation among points by utilizing the three-dimensional coordinate data of the known characteristic points of the power transmission line so as to reconstruct the path of the power transmission line. Linear interpolation techniques can generate smooth curves or line segments between known points.
Curve fitting: and obtaining a smooth curve of the power transmission line by fitting coordinate data of known characteristic points by using curve fitting technology, such as polynomial fitting or spline interpolation. These methods may provide more accurate line trajectories.
In an alternative embodiment, the topographic feature extraction may further comprise the operations of:
ground elevation information: and extracting the ground elevation information by combining the three-dimensional coordinate information by utilizing the characteristic points or the fitted paths on the power transmission line. This helps to know the fluctuation of the region where the transmission line is located.
And (3) ground gradient analysis: based on the extracted terrain elevation information, the slope and inclination of the terrain are calculated. This can be calculated by calculating the difference in elevation of adjacent feature points.
Relief assessment: and according to the elevation information and gradient analysis of the terrain, evaluating the fluctuation condition of the power transmission line along the terrain to determine the influence of the terrain on the power transmission line, such as a potential risk area or an area needing to be supported in a strengthening way.
In an alternative embodiment, the terrain impact assessment and risk analysis may further comprise the operations of:
terrain impact analysis: based on the extracted topographic feature information, analyzing the influence of topography on the power transmission line, including topography fluctuation, gradient, possible obstacles and the like
Risk assessment: and evaluating potential risks of the terrain to the stability and the safety of the power transmission line according to the terrain analysis result, and determining precaution or reinforcing measures to be taken.
In an alternative embodiment, the surface measurement data may be matched with the generated DTM data to establish a correspondence between them. This typically involves finding common landmarks and feature points to ensure accuracy of data matching. The generated DTM data is corrected so as to be consistent with the ground measurement data. This may include elevation adjustments, line position corrections, and updates of topographical features. A data consistency check is performed to ensure consistency between the surface measurement data and DTM data. Check if there is a mismatch or discrepancy and solve the problem. The calibrated DTM data is evaluated for accuracy to determine its accuracy. This may include an error analysis between the calibrated DTM data and the surface measurement data.
Still further, DTM data may be exported to power system management and planning tools for use in subsequent power transmission line design, planning, and maintenance. DTM data is delivered to the associated power system management, planning and maintenance team, typically via a network transmission or storage medium.
In a preferred embodiment, a system for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm includes: a data acquisition and preprocessing module, an algorithm combination module and a data extraction module,
the data acquisition and preprocessing module is used for acquiring image data of all areas of the mountain area power transmission corridor and preprocessing the image data, wherein the image data comprise image data of different time points and seasons;
the algorithm combining module is used for combining the distribution algorithm to identify the characteristics of the target object in the power transmission corridor according to the preprocessed image data and acquiring the three-dimensional data of the target object;
and the data extraction module is used for carrying out characteristic point matching according to the identified characteristics and three-dimensional data of the target object in the power transmission corridor and completing the extraction of DTM data of the power transmission corridor in the mountain area according to the characteristic matching result.
The above unit modules may be embedded in hardware or independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above units.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 3. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program, when executed by a processor, implements a method of extracting DTM data for a mountain power transmission corridor based on a distribution algorithm. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring image data of all areas of a mountain area power transmission corridor, and preprocessing the image data, wherein the image data comprise image data of different time points and seasons;
according to the preprocessed image data, combining a distribution algorithm to identify characteristics of a target object in a power transmission corridor and acquiring three-dimensional data of the target object;
and carrying out feature point matching according to the recognized features and three-dimensional data of the target object in the power transmission corridor, and completing extraction of DTM data of the power transmission corridor in the mountain area according to the feature matching result.
Example 2
Referring to fig. 2, for one embodiment of the present invention, a method and a system for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm are provided, and in order to verify the beneficial effects of the present invention, scientific demonstration is performed through experiments.
The purpose of the experiment is as follows: and verifying the accuracy and reliability of the DTM data extracted from the mountain area power transmission corridor based on a distribution algorithm.
The experimental steps are as follows:
1. selecting all areas of a mountain area power transmission corridor, and acquiring image data of different time points and seasons;
2. preprocessing image data, including denoising, enhancing and other operations;
3. identifying characteristics of a target object in a power transmission corridor by adopting a distribution algorithm, and acquiring three-dimensional data of the target object;
4. performing feature point matching according to the identified features of the target object in the power transmission corridor and the three-dimensional data;
5. according to the feature matching result, extracting DTM data of the mountain area power transmission corridor;
6. and comparing the extracted DTM data with ground measurement data to evaluate accuracy.
Experimental results:
by comparing the extracted DTM data with ground measurement data, the error rate is found to be lower than 5%, and the accuracy and reliability of extracting the DTM data of the mountain area power transmission corridor based on a distribution algorithm are proved.
The purpose of the experiment is as follows: and verifying the efficiency of extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm.
The experimental steps are as follows:
1. selecting mountain area power transmission corridor areas with different sizes, and acquiring image data;
2. extracting DTM data by using a cloth algorithm according to the method of example 1;
3. the time required to extract DTM data is recorded.
Experimental results:
by comparing the time required by the power transmission corridor areas with different sizes, the time required by extracting the DTM data is found to be correspondingly increased along with the increase of the area, but compared with the traditional method, the efficiency of extracting the DTM data of the mountain power transmission corridor based on a distribution algorithm is remarkably improved.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The solutions in the embodiments of the present application may be implemented in various computer languages, for example, object-oriented programming language Java, and an transliterated scripting language JavaScript, etc.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. The method for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm is characterized by comprising the following steps of:
acquiring image data of all areas of a mountain area power transmission corridor, and preprocessing the image data, wherein the image data comprises image data of different time points and seasons;
according to the preprocessed image data, combining a distribution algorithm to identify characteristics of a target object in a power transmission corridor and acquiring three-dimensional data of the target object;
and carrying out feature point matching according to the recognized features and three-dimensional data of the target object in the power transmission corridor, and completing extraction of DTM data of the power transmission corridor in the mountain area according to the feature matching result.
2. The method for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm as claimed in claim 1, wherein said acquiring image data of the entire area of the mountain power transmission corridor and preprocessing said image data includes:
establishing a space rectangular coordinate system, and placing all areas of the mountain area power transmission corridor in a first diagram;
shooting ten pieces of image data of different mountain area power transmission corridors at different positions, same distances and fixed angles by using an image acquisition tool at will, calculating three-dimensional space coordinates of four vertexes of an upper vertex, a lower vertex, a left vertex and a right vertex of the obtained mountain area power transmission corridors, and calculating the average mountain area power transmission corridors image shooting size of the image acquisition tool;
presetting shooting lines of all areas of the mountain area power transmission corridor by combining a space rectangular coordinate system according to 80% of the image shooting size of the average mountain area power transmission corridor;
and acquiring image data of all areas of the mountain area power transmission corridor according to the preset shooting line.
3. The method for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm as claimed in claim 2, wherein said acquiring image data of the entire area of the mountain power transmission corridor and preprocessing said image data further comprises:
performing geometric correction and radiation correction on the image data of all areas of the mountain area power transmission corridor;
the geometric correction comprises the steps of determining a conversion formula between corresponding points on an original input image of a mountain area power transmission corridor and corresponding points on an image after geometric correction by using a polynomial correction model, determining unknowns in the polynomial correction model according to control point data, judging the correctness of the polynomial correction model, and redesigning a new polynomial correction model when the correctness is judged to be incorrect;
the radiation correction comprises the steps of carrying out radiation correction on the mountain area power transmission corridor image data output after the geometric correction according to the mountain area power transmission corridor image data output after the geometric correction by combining the average inclined plane angles corresponding to mountain area positions of the corresponding mountain area power transmission corridor image, wherein the average inclined plane angles represent the average value of the inclined plane angles at the positions of the upper, lower, left and right vertexes of the image;
the radiation correction includes the steps of,
wherein f (i, j, l) is an image of a ground object on an inclined plane corresponding to the mountain position inclined plane angle a of the mountain power transmission corridor image, g (i, j, l) is a corrected image, and i, j, l represent coordinates corresponding to the center position of the image.
4. A method for extracting DTM data of a power transmission corridor in a mountain area based on a distribution algorithm as claimed in claim 3, wherein said identifying the characteristics of the object in the power transmission corridor in combination with the distribution algorithm based on the preprocessed image data, and acquiring the three-dimensional data of the object comprises:
for a certain pixel point (x, y) on the preprocessed image, a window W is designed to detect the change of the pixel value, and gradients Ix and Iy in two directions and a pixel value difference matrix M in the window are defined, then:
where w (x, y) is a weight function within the window, and the corner points are determined by calculating eigenvalues and response functions of the matrix M:
the response function is expressed as:
R＝det(M)-k·(trace(M)) 2
where k represents a constant for adjusting the magnitude of the response function R value.
5. The method for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm as claimed in claim 4, wherein said identifying the characteristics of the object in the power transmission corridor in combination with the distribution algorithm based on the preprocessed image data, and acquiring the three-dimensional data of the object further comprises:
when the response function value R is smaller than the first threshold value, preprocessing the image data again, and recalculating the response function value R;
if the recalculated response function value R is still smaller than the first threshold value, the following response function calculation formula is used for replacing the original response function;
where Ix and Iy represent gradients in both directions, k represents a constant for adjusting the magnitude of the response function R value, said lower threshold being determined by the average gradient value and the variance value.
6. The method for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm as claimed in claim 5, wherein said identifying the characteristics of the object in the power transmission corridor in combination with the distribution algorithm based on the preprocessed image data, and acquiring the three-dimensional data of the object further comprises:
when the response function value R is larger than the first threshold value, regarding the pixel point with the R value larger than the threshold value as a corner point;
after extracting the corner points, performing feature matching on the corner points among a plurality of preprocessed image data to determine the corresponding relation among different preprocessed images;
and converting the corner information into coordinate and attitude information in a three-dimensional space according to the feature matching result, and further reconstructing a three-dimensional model of the target object.
7. The method for extracting DTM data of a mountain power transmission corridor based on a distribution algorithm according to claim 6, wherein the performing feature point matching according to the identified features of the object in the power transmission corridor and the three-dimensional data, and performing extraction of DTM data of the mountain power transmission corridor according to the feature matching result comprises:
extracting shape information and topographic features of the power transmission line from the matched feature points, converting the extracted data into a digital topographic model, integrating elevation data and topographic data of the power transmission line into the digital topographic model, and performing data smoothing and filtering treatment;
and outputting the generated digital terrain model to finish the extraction of the DTM data of the mountain area power transmission corridor, wherein the digital terrain model is generated by integrating a triangular grid generating algorithm and elevation data.
8. The system for extracting the DTM data of the mountain area power transmission corridor based on the distribution algorithm is characterized by comprising the following steps: a data acquisition and preprocessing module, an algorithm combination module and a data extraction module,
the data acquisition and preprocessing module is used for acquiring image data of all areas of a mountain area power transmission corridor and preprocessing the image data, wherein the image data comprise image data of different time points and seasons;
the algorithm combination module is used for identifying the characteristics of the target object in the power transmission corridor according to the preprocessed image data and combining a cloth algorithm, and acquiring the three-dimensional data of the target object;
and the data extraction module is used for carrying out characteristic point matching according to the identified characteristics of the target object in the power transmission corridor and the three-dimensional data, and completing the extraction of the DTM data of the power transmission corridor in the mountain area according to the characteristic matching result.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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