CN108304766A - A method of based on high-definition remote sensing screening dangerous material stockyard - Google Patents

A method of based on high-definition remote sensing screening dangerous material stockyard Download PDF

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CN108304766A
CN108304766A CN201711312959.9A CN201711312959A CN108304766A CN 108304766 A CN108304766 A CN 108304766A CN 201711312959 A CN201711312959 A CN 201711312959A CN 108304766 A CN108304766 A CN 108304766A
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remote sensing
scale
image
point
dangerous material
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CN108304766B (en
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聂向军
齐越
董敏
冯云
王达川
左天立
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TRANSPORT PLANNING AND RESEARCH INSTITUTE MINISTRY OF TRANSPORT CHINA
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00Scenes; Scene-specific elements
    • G06V20/10Terrestrial scenes
    • G06V20/13Satellite images
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00Arrangements for image or video recognition or understanding
    • G06V10/40Extraction of image or video features
    • G06V10/44Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
    • G06V10/443Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components by matching or filtering
    • G06V10/449Biologically inspired filters, e.g. difference of Gaussians [DoG] or Gabor filters
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00Arrangements for image or video recognition or understanding
    • G06V10/70Arrangements for image or video recognition or understanding using pattern recognition or machine learning
    • G06V10/74Image or video pattern matching; Proximity measures in feature spaces
    • G06V10/75Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video features; Coarse-fine approaches, e.g. multi-scale approaches; using context analysis; Selection of dictionaries
    • G06V10/757Matching configurations of points or features

Abstract

The invention discloses a kind of methods based on high-definition remote sensing screening dangerous material stockyard, include the following steps:It is distinguished first by gray level co-occurrence matrixes, and target area is extracted according to the uniformity coefficient of gray scale;Secondly, it is used as the invariant features point of interest response extraction image local maximum and minimum point as image by carrying out convolution to scale parameter and directioin parameter in target area;Furthermore the matching of model and image is carried out by Hausdorff distances, and translation transformation is carried out by invariant features point and eliminates space error, matching is fitted to invariant features point;It finally passes sequentially through contrast characteristic's point to screen, obtains dangerous material stockyard;The substantive characteristics of remote sensing images is utilized, effective, reliable matching result can be generated, there is preferable fault-tolerant ability, situation that can be shielded to target part in image and image comprising multiple targets simultaneously is handled, it is suitable for the actual conditions in dangerous material stockyard, screening recognition efficiency is high.

Description

A method of based on high-definition remote sensing screening dangerous material stockyard
Technical field
It is specially a kind of that dangerous material stockyard is screened based on high-definition remote sensing the present invention relates to remote sensing recognition technical field Method.
Background technology
In traditional, compared with low resolution remote sensing image data, high-definition picture has following high-definition picture Several features:First, high-resolution remote sensing image is influenced by aerial image technology, and actual image data is for the light that utilizes It composes wave band to reduce, and with the reduction of spectral information, same object different images in image, foreign matter the phenomenon that composing with will largely exist, difference Ground object target is difficult to realize statistics extraction in image spectral domain;Secondly, with the raising of image resolution, in the same region Interior, the information obtaining ability of atural object will significantly increase, and at the same time, atural object classification will be more various in image, numerous Atural object in object is identified out is highly difficult;Finally, due to the atural object texture and shape that show in high resolution image Shape information is more obvious, in the past based in, the Spectral unmixing method of the remote sensing image of low resolution is difficult to be directly applied to high score It distinguishes in remote sensing image data interpretation.
And it is carried out by high-resolution remote sensing image in the method in dangerous material stockyard in identification harbour in remote sensing images Identification will be more difficult, this is because not having special spectrum feature and shape feature in dangerous material stockyard, can not establish effectively Identification database, therefore using traditional remote sensing images method computer it is effective identification in be hard to work.
Invention content
In order to overcome the shortcomings of that prior art, the present invention provide a kind of based on high-definition remote sensing screening dangerous material heap The method of field, is utilized the substantive characteristics of remote sensing images, can also be generated while having evaded correction calculation effective, reliable Matching result has preferable fault-tolerant ability, can be hidden simultaneously to target part in image and image comprising multiple targets The case where covering is handled, and is suitable for the actual conditions in dangerous material stockyard, screening recognition efficiency is high, can effectively solve the problem that background skill The problem of art proposes.
The technical solution adopted by the present invention to solve the technical problems is:One kind screening dangerous material based on high-definition remote sensing The method in stockyard, includes the following steps:
S100, target area is obtained based on textural characteristics, different textural characteristics and knot is distinguished by gray level co-occurrence matrixes Structure characteristic, and target area is extracted according to the uniformity coefficient of gray scale;
S200, feature point extraction is carried out by the method for scale-space, by scale parameter and side in target area Convolution, which is carried out, to parameter responds the invariant features point of extraction image local maximum and minimum point as image as interest;
S300, by translation vector eliminate invariant features point space error, by Hausdorff distance carry out model and The matching of image, and translation transformation is carried out by invariant features point and eliminates space error, matching is fitted to invariant features point;
S400, invariant features point library is established, remote sensing features point is screened one by one, matched inconvenient characteristic point will be fitted Sequence composition invariant features point library successively, and pass sequentially through contrast characteristic's point and screen, obtain dangerous material stockyard.
As a kind of preferred technical solution of the present invention, gray level co-occurrence matrixes distinguish different textural characteristics and structure feature Specific steps:
Setting the gray level that L indicates image local area, then gray level co-occurrence matrixes are expressed as the matrix of LxL in the region,
That is Pθ, d=[PI, j]LxL, wherein matrix element PijIt is θ to be expressed as direction in image local area, and distance is d, gray scale Value is respectively frequency of the pixel to appearance of i and j;
Co-occurrence matrix feature is extracted by statistical measurement by the frequency of appearance, obtains the grey scale change and line in the region Manage feature.
As a kind of preferred technical solution of the present invention, spatial frequency and location information are being extracted by gray level co-occurrence matrixes It filters progress textural characteristics by Gabor afterwards finely to extract, specific method is:
S101, set the functional form of Gabor filter as Wherein x, y are position coordinates, and j is space domain characteristic value, and w is concussion frequency, σxAnd σyFiltering is indicated respectively Standard deviation of the device in the directions x and the directions y;
S102, scale parameter u and directioin parameter v is added, then filter function is:
guv(x, y)=a-uG (x ', y '), wherein u, v are integer, a > 1,
And derivative
DerivativeWherein K is total direction number;
S103, m scale is carried out by filter function input image I (x, y), the Gabor in n direction is converted, and right The feature of unified scale different directions is averaged to obtain m textural characteristics subband to get the characteristic vector tieed up to a m as shadow Texture feature information X={ the x of each pixel (x, y) as in1, x2..., xm}。
As a kind of preferred technical solution of the present invention, in step s 200, the specific algorithm of scale-space method is:
S201, the standard deviation Gauss equation for corresponding to different scale is set as L (u, v, σ)=G (u, v, σ) * I (u, v), wherein U is scale parameter, and v is directioin parameter, and σ is scale, and G (u, v, σ) is two-dimensional Gaussian function, and I (u, v) is the ruler of remote sensing images Degree-directivity function;
S202, two-dimensional Gaussian function is calculated
S203, scale-directivity function I (u, the v)=L (u, v, σ) for setting remote sensing images carry out cycle calculations, until scale σ Equal to parameter value, and the reference value of scale σ is 1.6.【Technique study P19】
It should be carried out two-way as a kind of preferred technical solution of the present invention when carrying out the calculating of scale-space method It calculates.
As a kind of preferred technical solution of the present invention, the Hausdor distances are specifically defined as:Set two remote sensing Characteristic point A={ a1, a2..., apAnd B={ b1, b2..., bq, then Hausdor distance be H (A, B)=max (h (A, B), h (B, A)), wherein| | | | it is distance measure.
As a kind of preferred technical solution of the present invention, in Hausdor distances calculate, acceleration strategy, which may be used, to be had It is calculated in the range of limit.
As a kind of preferred technical solution of the present invention, in step S300, invariant features point carries out the tool of translation transformation Body step is:
Two S301, setting feature point set A={ a1, a2..., apAnd B={ b1, b2..., bq, and feature point set is taken to make For the reference set of range conversion;
S302, settingIt is characterized the distance map of point set A, sets D 'It is characterized the distance map of point set B, then there are asked relative to each other when translation transformation between A and B Take Hausdor distances;
S303, the ratio of defined feature point set A and feature point set B or the ratio of feature point set B and feature point set A are Threshold value is converted, and it is F (x, y) to set the distances of the opposite Hausdor between A and B, during carrying out translation transformation so that F It is effective translation transformation that the change threshold that (x, y) is minimized, which is less than 1,.
As a kind of preferred technical solution of the present invention, after composition invariant features point library, specific screening step is such as Shown in lower:
S401, setting time coefficient are γ1, cloud amount coefficient is γ2, resolution rate coefficient is γ3, wherein 0≤γ≤1, and γ123=1;
S402, remote sensing image weighted value be γ=γ112233, wherein λ1、λ2And λ3It is respectively corresponding The weight of coefficient;
S403, the weighted value that the record per data is calculated according to the weighted value of above-mentioned remote sensing image, and to all remote sensing Data are screened, and the maximum data of weighted value are charged to filter record collection.
As a kind of preferred technical solution of the present invention, duplicate removal processing is carried out to the filter record collection of acquisition, is obtained new Result set is retrieved and judges data that filter record is concentrated whether in result set, there is no result set is then added, until completing The retrieval of all data.
Compared with prior art, the beneficial effects of the invention are as follows:Present invention utilizes the substantive characteristics of remote sensing images, can Overcome image to change the influence brought in imaging process conditional, the application of correcting algorithm can be overcome, evades the fortune of correction It calculates, effective, reliable matching result can also be generated while having evaded correction calculation, to smaller in high-definition picture Labour, which influences insensitive that is, smaller disturbance, not to be influenced to carry out in screening process, this is just effectively directly neglected on source Data are slightly interfered, there is preferable fault-tolerant ability, it can on the basis of retaining legacy data characteristic by the comparison of characteristic point It is handled with situation shielded to target part in image and image comprising multiple targets simultaneously, is suitable for dangerous material heap Actual conditions, not complicated data calculation process, whole process is simple and direct, and it is conventional screening calculation amount that calculating process, which takes, 30%-50%, screening recognition efficiency be well improved.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
Embodiment:
As shown in Figure 1, the present invention provides a kind of methods based on high-definition remote sensing screening dangerous material stockyard, including such as Lower step:
Step S100, textural characteristics are based on and obtain target area, different textural characteristics are distinguished by gray level co-occurrence matrixes And architectural characteristic, and target area is extracted according to the uniformity coefficient of gray scale.
Step S101, setting L indicates the gray level of image local area, then gray level co-occurrence matrixes are expressed as in the region The matrix of LxL,
That is Pθ, d=[PI, j]LxL, wherein matrix element PijIt is θ to be expressed as direction in image local area, and distance is d, gray scale Value is respectively frequency of the pixel to appearance of i and j;
Co-occurrence matrix feature is extracted by statistical measurement by the frequency of appearance, obtains the grey scale change and line in the region Manage feature.For example, if intensity profile is uneven in region, the value of the main focusing element of matrix can be bigger.
In the present embodiment, it is also necessary to attention, due in the processing procedure of gray level co-occurrence matrixes, the ash in region Degree is random distribution, and similar frequency will be presented in the element in co-occurrence matrix, and this frequency will in high-definition picture Will produce it is serious obscure interference, need to carry out fine processing, be convenient for identification and utilization of the subsequent step to textural characteristics, logical It is finely extracted, is had by Gabor filtering progress textural characteristics after crossing gray level co-occurrence matrixes extraction spatial frequency and location information The method of body is:
Step S101, set the functional form of Gabor filter as Wherein x, y are position coordinates, and j is space domain characteristic value, and w is concussion frequency, σxAnd σyRespectively Standard deviation of the expression filter in the directions x and the directions y;
Step S102, scale parameter u and directioin parameter v is added, then filter function is:
guv(x, y)=a-uG (x ', y '), wherein u, v are integer, a > 1,
And derivative
DerivativeWherein K is total direction number;
Step S103, by filter function input image I (x, y) carry out m scale, the Gabor transformation in n direction, And it is averaged to obtain m textural characteristics subband to the feature of unified scale different directions to get the characteristic vector work tieed up to a m For the texture feature information X={ x of each pixel (x, y) in image1, x2..., xm}。
Step S200, feature point extraction is carried out by the method for scale-space, by scale parameter in target area Convolution, which is carried out, with directioin parameter responds the invariant features of extraction image local maximum and minimum point as image as interest Point.
The extraction of feature based point is due to detecting characteristic point in the target area, having operational efficiency high, extract feature The advantages that abundant, convenient for the application in high-resolution remote sensing image.
In step s 200, the specific algorithm of scale-space method is:
Step S201, set the standard deviation Gauss equation of corresponding different scale as L (u, v, σ)=G (u, v, σ) * I (u, V), wherein u is scale parameter, and v is directioin parameter, and σ is scale, and G (u, v, σ) is two-dimensional Gaussian function, and I (u, v) is remote sensing figure Scale-directivity function of picture;
Step S202, two-dimensional Gaussian function is calculated
Step S203, scale-directivity function I (u, the v)=L (u, v, σ) for setting remote sensing images carries out cycle calculations, until ruler It spends σ and is equal to parameter value, and the reference value of scale σ is 1.6.
Step S300, the space error that invariant features point is eliminated by translation vector is carried out by Hausdorff distances The matching of model and image, and translation transformation is carried out by invariant features point and eliminates space error, invariant features point is intended Close matching.
The Hausdor distances are specifically defined as:Set two remote sensing features point A={ a1, a2..., apAnd B= {b1, b2..., bq, then Hausdor distances are H (A, B)=max (h (A, B), h (B, A)), wherein| | | | it is distance measure.
By above-mentioned definition it is found that Hausdor distances have weighed the whole matching degree of point set A and point set B, it is not suitable for Therefore the subset of the subset and point set B of point set A when carrying out Hausdor distance calculating, that is, is carrying out scale-sky Between method calculating when, two-way calculating should be carried out, using two-way Hausdor distances overcome subset cannot participate in calculate lack It falls into, realizes comprehensive covering, the consistency matching of subset can be realized while point set is matched.
And among the above, the matching of model and image is carried out using the Hausdor distances of two-way part, this is the spy by image What point determined, because image generally comprises multiple targets, and target in the picture is there may be the shielded situation in part, into The two-way calculating of row can carry out the feature points of matched image section and model part by being arranged, and then overcome respectively The above problem.
In step S300, invariant features point carry out translation transformation the specific steps are:
Step S301, two feature point set A={ a are set1, a2..., apAnd B={ b1, b2..., bq, and take characteristic point Collect the reference set as range conversion;
Step S302, it setsIt is characterized the distance map of point set A, sets D 'It is characterized the distance map of point set B, then there are asked relative to each other when translation transformation between A and B Take Hausdor distances;
Step S303, the ratio of the ratio of defined feature point set A and feature point set B or feature point set B and feature point set A To convert threshold value, and sets the distances of the opposite Hausdor between A and B and make during carrying out translation transformation for F (x, y) It is effective translation transformation to obtain the change threshold that F (x, y) is minimized to be less than 1.
During carrying out translation transformation, by above-mentioned it is found that not all above-mentioned transformation is meaningful, Therefore it can be calculated in the range that translation collects very limited by acceleration strategy.
Step S400, invariant features point library is established, remote sensing features point is screened one by one, will be fitted matched inconvenient special Sequence forms invariant features point library to sign point successively, and passes sequentially through contrast characteristic's point and screen, and obtains dangerous material stockyard.
After composition invariant features point library, specific screening step is as follows:
Step S401, setting time coefficient is γ1, cloud amount coefficient is γ2, resolution rate coefficient is γ3, wherein 0≤γ≤ 1, and γ123=1;
Step S402, the weighted value of remote sensing image is γ=γ112233, wherein λ1、λ2And λ3Respectively The weight of coefficient of correspondence;
Step S403, the weighted value of the record per data is calculated according to the weighted value of above-mentioned remote sensing image, and to all Remotely-sensed data is screened, and the maximum data of weighted value are charged to filter record collection.
In above-mentioned screening step, it is necessary first to according to the condition of retrieval, such as resolving range, geographic area and Time range etc. retrieves satisfactory all remote sensing image data record sets, and weight system is determined further according to actual demand Number carries out above-mentioned steps.
Duplicate removal processing is carried out to the filter record collection of acquisition, obtains new result set, retrieve and judges that filter record is concentrated Data whether in result set, there is no result set is then added, until completing the retrieval of all data.
In conclusion the main characteristic of the invention lies in that:
(1) substantive characteristics of remote sensing images is utilized, image can be overcome to change the shadow brought in imaging process conditional It rings, the application of correcting algorithm can be overcome, evaded the operation of correction, can also have been generated while having evaded correction calculation Effect, reliable matching result;
(2) influencing insensitive that is, smaller disturbance to labour smaller in high-definition picture does not influence to screen It is carried out in journey, this just effectively directly ignores interference data on source, has preferable fault-tolerant ability;
It (3), can be simultaneously to including multiple targets on the basis of retaining legacy data characteristic by the comparison of characteristic point Image and image in the shielded situation of target part handled, be suitable for the actual conditions in dangerous material stockyard;
(4) not complicated data calculation process, whole process is simple and direct, and it is conventional screening calculation amount that calculating process, which takes, 30%-50%, screening recognition efficiency are well improved.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.

Claims (10)

1. a kind of method based on high-definition remote sensing screening dangerous material stockyard, which is characterized in that include the following steps:
S100, target area is obtained based on textural characteristics, distinguishes different textural characteristics by gray level co-occurrence matrixes and structure is special Property, and target area is extracted according to the uniformity coefficient of gray scale;
S200, feature point extraction is carried out by the method for scale-space, by scale parameter and direction ginseng in target area Number carries out convolution and responds the invariant features point of extraction image local maximum and minimum point as image as interest;
S300, the space error that invariant features point is eliminated by translation vector carry out model and image by Hausdorff distances Matching, and by invariant features point carry out translation transformation eliminate space error, matching is fitted to invariant features point;
S400, invariant features point library is established, remote sensing features point is screened one by one, matched inconvenient characteristic point will be fitted successively Sequence composition invariant features point library, and pass sequentially through contrast characteristic's point and screen, obtain dangerous material stockyard.
2. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 1, which is characterized in that Gray level co-occurrence matrixes distinguish the specific steps of different textural characteristics and structure feature:
Setting the gray level that L indicates image local area, then gray level co-occurrence matrixes are expressed as the matrix of LxL in the region,
That is Pθ, d=[PI, j]LxL, wherein matrix element PijIt is θ to be expressed as direction in image local area, and distance is d, gray value point Not Wei i and j pixel to the frequency of appearance;
Co-occurrence matrix feature is extracted by statistical measurement by the frequency of appearance, obtains the grey scale change in the region and texture spy Sign.
3. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 2, which is characterized in that Progress textural characteristics are filtered after extracting spatial frequency and location information by gray level co-occurrence matrixes by Gabor finely to extract, Specific method is:
S101, set the functional form of Gabor filter as Wherein x, y are position coordinates, and j is space domain characteristic value, and w is concussion frequency, σxAnd σyFiltering is indicated respectively Standard deviation of the device in the directions x and the directions y;
S102, scale parameter u and directioin parameter v is added, then filter function is:
guv(x, y)=a-uG (x ', y '), wherein u, v are integer, a > 1,
And derivative
DerivativeWherein K is total direction number;
S103, by filter function input image I (x, y) carry out m scale, the Gabor transformation in n direction, and to uniformly The feature of scale different directions is averaged to obtain m textural characteristics subband to get the characteristic vector tieed up to a m as in image Texture feature information X={ the x of each pixel (x, y)1, x2..., xm}。
4. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 1, which is characterized in that In step s 200, the specific algorithm of scale-space method is:
S201, the standard deviation Gauss equation for setting corresponding different scale are as L (u, v, σ)=G (u, v, σ) * I (u, v), wherein u Scale parameter, v are directioin parameter, and σ is scale, and G (u, v, σ) is two-dimensional Gaussian function, and I (u, v) is scale-side of remote sensing images To function;
S202, two-dimensional Gaussian function is calculated
S203, scale-directivity function I (u, the v)=L (u, v, σ) for setting remote sensing images carry out cycle calculations, until scale σ is equal to Parameter value, and the reference value of scale σ is 1.6.
5. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 4, which is characterized in that When carrying out the calculating of scale-space method, two-way calculating should be carried out.
6. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 1, which is characterized in that The Hausdor distances are specifically defined as:Set two remote sensing features point A={ a1, a2..., apAnd B={ b1, b2..., bq, then Hausdor distances are H (A, B)=max (h (A, B), h (B, A)), wherein h (A, B)=maxa∈Aminb∈B| | a-b | |, | | | | it is distance measure.
7. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 6, which is characterized in that In Hausdor distances calculate, acceleration strategy may be used and calculated in limited range.
8. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 1, which is characterized in that In step S300, invariant features point carry out translation transformation the specific steps are:
Two S301, setting feature point set A={ a1, a2..., apAnd B={ b1, b2..., bq, and take feature point set be used as away from Reference set from transformation;
S302, setting D [x, y]=mina∈A| | (x, y)-a | | it is characterized the distance map of point set A, sets D, [x, y]=minb∈B|| (x, y)-b | | it is characterized the distance map of point set B, then there are seek Hausdor distances when translation transformation relative to each other between A and B;
S303, the ratio of defined feature point set A and feature point set B or the ratio of feature point set B and feature point set A are transformation threshold Value, and it is F (x, y) to set the distances of the opposite Hausdor between A and B, during carrying out translation transformation so that F (x, y) It is effective translation transformation that the change threshold being minimized, which is less than 1,.
9. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 8, which is characterized in that After composition invariant features point library, specific screening step is as follows:
S401, setting time coefficient are γ1, cloud amount coefficient is γ2, resolution rate coefficient is γ3, wherein 0≤γ≤1, and γ123=1;
S402, remote sensing image weighted value be γ=γ112233, wherein λ1、λ2And λ3Respectively coefficient of correspondence Weight;
S403, the weighted value that the record per data is calculated according to the weighted value of above-mentioned remote sensing image, and to all remotely-sensed datas It is screened, the maximum data of weighted value is charged into filter record collection.
10. a kind of method based on high-definition remote sensing screening dangerous material stockyard according to claim 1, feature exist In carrying out duplicate removal processing to the filter record collection of acquisition, obtain new result set, retrieve and judge the data that filter record is concentrated Whether in result set, there is no result set is then added, until completing the retrieval of all data.
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