CN114494035A - Method for eliminating interference of strong scattering bright target in millimeter wave human body imaging - Google Patents
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Abstract
The invention provides a method for eliminating interference of a strong scattering bright target in millimeter wave human body imaging, which comprises three-dimensional image reconstruction processing, three-dimensional image filtering, human body contour extraction and generation of a two-dimensional visual image, utilizes the characteristic that the imaging result of a dihedral angle or a dihedral angle formed by natural structures of human bones, skins and the like is not on the surface of the human body contour, and realizes the elimination of strong bright points and strong bright lines by extracting the contour data of the human body surface. The invention can greatly reduce strong bright spots and strong bright lines in the two-dimensional millimeter wave visual image of the human body, so that the image texture is uniform, the uniform characteristic of the skin surface of the human body is reflected more truly, the influence of the strong bright spots and the strong bright lines on the judgment of suspicious articles is avoided, the accuracy of identifying the suspicious articles on the skin surface of the human body by workers through human eyes or artificial intelligence is higher, the time waste caused by uncertain workers or misjudgment of the suspicious articles is reduced, and the passing efficiency of the security inspection equipment is improved.
Description
Technical Field
The invention relates to the technical field of measurement and testing, in particular to a method for eliminating strong scattering bright target interference in millimeter wave human body imaging.
Background
In recent years, the variety of articles causing harm is more and more, and the traditional human body security inspection means cannot meet the current safety requirement. The traditional hand-held metal detector and the metal detection door can only detect metal contraband carried by human body, and can not be used for non-metal contraband such as plastic bombs and ceramic cutters; although the X-ray security inspection equipment can penetrate through clothes to image all prohibited articles, the X-ray security inspection equipment has certain threat to human health and is not an optimal human security inspection means. The existing millimeter wave three-dimensional imaging technology can realize the imaging of a human body by penetrating clothes, and is an effective method for replacing the traditional human body security inspection means.
The millimeter wave three-dimensional imaging technology transmits broadband millimeter wave signals at a plurality of spatial positions to irradiate a human body target, receives and collects echo signals reflected by the human body target, and obtains a three-dimensional millimeter wave human body image of the human body through three-dimensional image reconstruction processing. In order to adapt to the visual habits of people or for automatic detection processing of suspicious objects based on artificial intelligence, a distance-to-maximum value or distance-to-sum mode is usually adopted to project a three-dimensional image to a two-dimensional space so as to obtain a two-dimensional millimeter wave visual image of a human body. However, natural structures such as bones and skins of a human body often form dihedral angles or trihedral angles, which easily cause strong bright spots or strong bright lines in a two-dimensional millimeter wave visual image of the human body, and seriously interfere with the screening effect of dangerous goods carried by the human body.
Disclosure of Invention
The invention provides a method for eliminating interference of strong bright spots or strong bright lines in millimeter wave three-dimensional imaging, which utilizes the characteristic that the imaging result of dihedral angles or dihedral angles formed by natural structures of human bones, skins and the like is not on the surface of a human body contour to eliminate the strong bright spots and the strong bright lines by extracting the contour data of the human body surface.
The invention provides a method for eliminating strong scattering bright target interference in millimeter wave human body imaging, which comprises the following steps:
s1, three-dimensional image reconstruction processing: the millimeter wave three-dimensional imaging equipment is used for acquiring human body target echo data, and the three-dimensional holographic imaging algorithm is used for processing the human body target echo data to obtain a three-dimensional imaging result SijkWherein i is more than or equal to 1 and less than or equal to Ny，1≤j≤Nx，1≤k≤Nz，NyNumber of imaging points in y-direction for three-dimensional imaging results, NxNumber of imaging points in x-direction for three-dimensional imaging results, NzThe number of imaging points in the z direction from the three-dimensional imaging result is obtained, the y direction is the vertical direction, and the x direction is the horizontal direction;
s2, three-dimensional image filtering: results of three-dimensional imaging SijkFiltering and normalizing to obtain a normalized human body three-dimensional imaging result S'ijk；
S3, extracting the human body contour: establishing a human body contour two-dimensional interpolation model matrix RmnTo normalized human body three-dimensional imaging result S'ijkTo the maximum value ρ'ijCarrying out two-dimensional interpolation to obtain the estimated human body contour position
Results of three-dimensional imaging SijkThe middle position is
And optimizing to obtain human body contour data
S4, generating a two-dimensional visual image: extracting a three-dimensional imaging result SijkA middle distance of
To obtain a two-dimensional visual image
And (5) finishing the interference elimination of the strong scattering bright target.
The invention relates to a method for eliminating interference of a strong scattering bright target in millimeter wave human body imaging, which is a preferable mode, in step S1, human body target echo data is human body target front echo data and/or human body target back echo data;
the three-dimensional imaging result is a front three-dimensional imaging result and/or a back three-dimensional imaging result.
The invention relates to a method for eliminating strong scattering bright target interference in millimeter wave human body imaging, which is a preferable mode, and in the step S2, the filtering method comprises the following steps: median filtering and smooth filtering, wherein the median filtering is used for filtering out the three-dimensional imaging result SijkThe flat filtering is used for filtering the three-dimensional imaging result SijkRandom noise and speckle noise in (1).
The invention relates to a method for eliminating strong scattering bright target interference in millimeter wave human body imaging, which is a preferable mode, and the step S3 comprises the following steps:
s31, establishing a human body contour two-dimensional interpolation model matrix RmnWherein M is 1. ltoreq. m.ltoreq.alphayNy，1≤n≤N＝αxNxM is the number of points of the two-dimensional interpolation model in the y direction, alphayIs an interpolation coefficient in the vertical direction, alphayLess than 1, N is the point number of the two-dimensional interpolation model in the x direction, alphaxAs interpolation coefficient in the horizontal direction, alphax＜1；
S32, and carrying out three-dimensional imaging on the normalized human body'ijkDistance direction taking maximum value rho'ijRecord the maximum value ρ'ijAnd for the maximum value ρ'ijTwo-dimensional interpolation is carried out to obtain an initial value
Wherein T is iteration times, T is more than or equal to 0 and less than or equal to T；
S33, comparing the initial value
Two-dimensional interpolation is carried out to obtain the estimated human body contour position
S34, and taking human body three-dimensional imaging result SijkMiddle position
As an objective function, calculating the objective function
S35, judgment
If true, the matrix is retained, if so
The current value of the middle element; if not, the matrix is not retained
The current value of the middle element; change matrix
Returns to step S32 until the matrix is reached
All the elements in the list are calculated;
and S36, returning to the step S32 until the iteration time T is T times, and finishing optimization to obtain the human body contour data
The invention relates to a hairA method for eliminating interference of strong scattering bright target in meter wave human body imaging is that in step S31, a human body contour two-dimensional interpolation model matrix R is used as an optimal modemnThe value range is as follows: r is more than or equal to 1mn≤Nz。
The invention relates to a method for eliminating strong scattering bright target interference in millimeter wave human body imaging, which is characterized in that in a preferred mode, in step S34, an objective function
Comprises the following steps:
the invention relates to a method for eliminating interference of strong scattering bright targets in millimeter wave human body imaging, which is an optimal mode, and in step S4, a two-dimensional visual image is taken as a preferred mode
Comprises the following steps:
the invention has the following advantages:
the invention can greatly reduce strong bright spots and strong bright lines in the two-dimensional millimeter wave visual image of the human body, so that the image texture is uniform, the uniform characteristic of the skin surface of the human body is reflected more truly, the influence of the strong bright spots and the strong bright lines on the judgment of suspicious articles is avoided, the accuracy of identifying the suspicious articles on the skin surface of the human body by workers through human eyes or artificial intelligence is higher, the time waste caused by uncertain workers or misjudgment of the suspicious articles is reduced, and the passing efficiency of the security inspection equipment is improved.
Drawings
FIG. 1 is a flow chart of a method for eliminating interference of a strong scattering bright target in millimeter wave human body imaging;
FIG. 2 is a two-dimensional millimeter wave visual diagram of a human back surface of a strong scattering bright target interference cancellation method in millimeter wave human imaging;
FIG. 3 is a horizontal x-distance z sectional view of bright spots in a three-dimensional imaging result of a human body by a method for eliminating interference of a strong scattering bright target in millimeter wave human body imaging;
FIG. 4 is a schematic diagram of human body contour data of a method for eliminating strong scattering bright target interference in millimeter wave human body imaging;
fig. 5 is a two-dimensional visual diagram of a method for eliminating interference of a strong scattering bright target in millimeter wave human body imaging.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, a method for eliminating interference of a strong scattering bright target in millimeter wave human body imaging includes the following steps:
s1, three-dimensional image reconstruction processing: the millimeter wave three-dimensional imaging equipment is used for acquiring human body target echo data, and the three-dimensional holographic imaging algorithm is used for processing the human body target echo data to obtain a three-dimensional imaging result SijkWherein i is more than or equal to 1 and less than or equal to Ny，1≤j≤Nx，1≤k≤Nz，NyNumber of imaging points in y-direction for three-dimensional imaging results, NxNumber of imaging points in x-direction for three-dimensional imaging results, NzImaging points in the z direction of the three-dimensional imaging result, wherein the y direction is the vertical direction, and the x direction is the horizontal direction;
the human body target echo data are human body target front echo data and/or human body target back echo data, and the three-dimensional imaging result is a front three-dimensional imaging result and/or a back three-dimensional imaging result.
S2, three-dimensional image filtering: results of three-dimensional imaging SijkFiltering and normalizing to obtain a normalized human body three-dimensional imaging result S'ijk；
The filtering method comprises the following steps: a median filtering and a smoothing filtering are performed,median filtering for filtering three-dimensional imaging result SijkThe flat filtering is used for filtering the three-dimensional imaging result SijkRandom noise and speckle noise in (1);
s3, extracting the human body contour: establishing a human body contour two-dimensional interpolation model matrix RmnTo normalized human body three-dimensional imaging result S'ijkTo the maximum value ρ'ijCarrying out two-dimensional interpolation to obtain the estimated human body contour position
Results of three-dimensional imaging SijkThe middle position is
And optimizing to obtain human body contour data
S31, establishing a human body contour two-dimensional interpolation model matrix RmnWherein M is not less than 1 and not more than M is not more than alphayNy，1≤n≤N＝αxNxM is the number of points of the two-dimensional interpolation model in the y direction, alphayIs an interpolation coefficient in the vertical direction, alphayLess than 1, N is the point number of the two-dimensional interpolation model in the x direction, alphaxAs interpolation coefficient in the horizontal direction, alphax＜1；
Human body contour two-dimensional interpolation model matrix RmnThe value range is as follows: r is more than or equal to 1mn≤Nz；
S32, and carrying out three-dimensional imaging on the normalized human body'ijkDistance direction taking maximum value rho'ijRecord the maximum value ρ'ijAnd for the maximum value ρ'ijTwo-dimensional interpolation is carried out to obtain an initial value
Wherein T is iteration times, and T is more than or equal to 0 and less than or equal to T;
s33, comparing the initial value
Two-dimensional interpolation is carried out to obtain the estimated human body contour position
S34, and taking human body three-dimensional imaging result SijkMiddle position
As an objective function, calculating the objective function
Objective function
Comprises the following steps:
s35, judgment
If true, the matrix is retained, if so
The current value of the middle element; if not, the matrix is not retained
The current value of the middle element; change matrix
Returns to step S32 until the matrix is reached
All the elements in the list are calculated;
and S36, returning to the step S32 until the iteration time T is T times, and finishing the optimization to obtain the human body contour data when T is T +1
S4, generating a two-dimensional visual image: extracting a three-dimensional imaging result SijkA middle distance of
To obtain a two-dimensional visual image
Two-dimensional visual image
Comprises the following steps:
Example 2
As shown in fig. 1, a method for eliminating strong scattering bright target interference in millimeter wave human body imaging includes the following steps:
1. three-dimensional image reconstruction processing
The method comprises the steps of obtaining echo data of the front side (back side) of a human body target by using millimeter wave three-dimensional imaging equipment, processing the original echo data by using a three-dimensional holographic imaging algorithm, obtaining the amplitude of a processing result, and obtaining a three-dimensional imaging result S of the front side (back side) of the human body targetijkWherein i is more than or equal to 1 and less than or equal to Ny，1≤j≤Nx，1≤k≤Nz，NyNumber of imaging points in vertical y-direction for three-dimensional imaging results, NxNumber of imaging points in horizontal x-direction for three-dimensional imaging results, NzAnd imaging points in the distance direction z are the three-dimensional imaging result.
2. Three-dimensional image filtering
(1) Filtering salt and pepper noise in the three-dimensional imaging result by adopting a median filtering method;
(2) filtering random noise and speckle noise in the three-dimensional imaging result by adopting a smoothing filtering method;
(3) normalizing the filtered three-dimensional imaging result to obtain a normalized human body three-dimensional imaging result S'ijk。
3. Human body contour extraction
(1) Establishing a human body contour two-dimensional interpolation model matrix RmnWherein M is not less than 1 and not more than M is not more than alphayNy，1≤n≤N＝αxNxM is the number of points of the two-dimensional interpolation model in the vertical y direction, alphayLess than 1 is the interpolation coefficient in the vertical direction, N is the number of points of the two-dimensional interpolation model in the horizontal x direction, alphax< 1 is the interpolation coefficient in the horizontal direction. The value range of the matrix element of the two-dimensional interpolation model is 1-Rmn≤Nz；
(2) Three-dimensional imaging result S 'of filtered human body'ijkThe distance direction is taken as the maximum value, and the position rho 'of the maximum value is recorded'ij. To rho'ijTwo-dimensional interpolation is carried out to obtain an initial value
(3) To pair
Two-dimensional interpolation is carried out to obtain the estimated human body contour position
(3) With human three-dimensional imaging results SijkMiddle position
As an objective function, calculating the objective function
(4) Change matrix
Is performed with step (2) (3), if
The current value of the element is retained.
(5) Repeating the steps (2), (3) and (4) T times, wherein T is the number of searching times. Obtaining the contour data of the human body after the optimization is finished
4. Generating two-dimensional visual images
Extracting the three-dimensional imaging result of the human body, wherein the distance is
To obtain a two-dimensional image of the human target
As shown in fig. 2, the two-dimensional millimeter wave visual image of the back of the human body is shown, and the left and right bright spots and bright lines in the white dotted frame in the image are the imaging results of the three-face angle (bright spot) and the two-face angle (bright line) formed by natural structures such as bones and skins of the human body.
As shown in FIG. 3, the horizontal x-distance z section of the bright spot is shown in the three-dimensional imaging result of the human body, and the imaging result of the bright spot is not at the same distance (within the contour surface of the human body) as the contour surface of the human body. In the figure, white dotted lines indicate the positions of three-dimensional imaging results of the human body at different horizontal x positions and the maximum positions of the distance z.
As shown in FIG. 4, the white dotted line is the human body contour data obtained by the method of the present invention
Fig. 5 shows a two-dimensional visual image generated by the method of the present invention, in which the left and right bright points and bright lines in the white dotted frame of the image are removed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A strong scattering bright target interference elimination method in millimeter wave human body imaging is characterized in that: the method comprises the following steps:
s1, three-dimensional image reconstruction processing: the method comprises the steps of obtaining human body target echo data by using millimeter wave three-dimensional imaging equipment, and processing the human body target echo data by using a three-dimensional holographic imaging algorithm to obtain a three-dimensional imaging result SijkWherein i is more than or equal to 1 and less than or equal to Ny，1≤j≤Nx，1≤k≤Nz，NyNumber of imaging points in y-direction for three-dimensional imaging results, NxNumber of imaging points in x-direction for three-dimensional imaging results, NzThe number of imaging points in the z direction from the three-dimensional imaging result is obtained, the y direction is the vertical direction, and the x direction is the horizontal direction;
s2, filtering the three-dimensional image: imaging the three-dimensional result SijkFiltering and normalizing to obtain a normalized human body three-dimensional imaging result S'ijk；
S3, extracting the human body contour: establishing a human body contour two-dimensional interpolation model matrix Rmn(iii) three-dimensional imaging of the normalized human body result S'ijkTo the maximum value ρ'ijCarrying out two-dimensional interpolation to obtain the estimated human body contour position
Imaging the three-dimensional result SijkThe middle position is
And optimizing to obtain human body contour data
S4, generating a two-dimensional visual image: extracting the three-dimensional imaging result SijkA middle distance of
To obtain a two-dimensional visual image
And (5) finishing the interference elimination of the strong scattering bright target.
2. The method for eliminating the interference of the strong scattering bright target in the millimeter wave human body imaging according to claim 1, wherein the method comprises the following steps: in step S1, the human body target echo data is human body target front echo data and/or human body target back echo data;
the three-dimensional imaging result is a front three-dimensional imaging result and/or a back three-dimensional imaging result.
3. The method for eliminating the interference of the strong scattering bright target in the millimeter wave human body imaging according to claim 1, wherein the method comprises the following steps: in step S2, the filtering method includes: median filtering and smooth filtering, wherein the median filtering is used for filtering the three-dimensional imaging result SijkThe smoothing filtering is used for filtering the three-dimensional imaging result SijkRandom noise and speckle noise in (1).
4. The method for eliminating the interference of the strong scattering bright target in the millimeter wave human body imaging according to claim 1, wherein the method comprises the following steps: step S3 includes the following steps:
s31, establishing the human body contour two-dimensional interpolation model matrix RmnWherein M is not less than 1 and not more than MαyNy，1≤n≤N＝αxNxM is the number of points of the two-dimensional interpolation model in the y direction, alphayIs an interpolation coefficient in the vertical direction, alphayN is the number of points of the two-dimensional interpolation model in the x direction, alphaxAs interpolation coefficient in the horizontal direction, alphax＜1；
S32, carrying out three-dimensional imaging on the normalized human body'ijkDistance direction taking maximum value rho'ijRecord the maximum value ρ'ijAnd for the maximum value ρ'ijTwo-dimensional interpolation is carried out to obtain an initial value
Wherein T is iteration times, and T is more than or equal to 0 and less than or equal to T;
s33, comparing the initial value
Performing two-dimensional interpolation to obtain the estimated human body contour position
S34, and taking human body three-dimensional imaging result SijkMiddle position
As an objective function, calculating the objective function
S35, judgment
If true, the matrix is retained, if so
The current value of the element in (1); if not, the matrix is not retained
The current value of the middle element; change matrix
Returns to step S32 until the matrix is reached
All the elements in the list are calculated;
and S36, returning to the step S32 until the iteration time T is T times, and finishing optimization to obtain the human body contour data
5. The method for eliminating interference of the strong scattering bright target in the millimeter wave human body imaging according to claim 4, wherein the method comprises the following steps:
in step S31, the human body contour two-dimensional interpolation model matrix RmnThe value range is as follows: r is more than or equal to 1mn≤Nz。
6. The method for eliminating interference of the strong scattering bright target in the millimeter wave human body imaging according to claim 4, wherein the method comprises the following steps: in step S34, an objective function
Comprises the following steps:
7. the millimeter wave human body imaging of claim 1The method for eliminating the interference of the strong scattering bright target is characterized by comprising the following steps: in step S4, the two-dimensional visual image
Comprises the following steps:
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