CN112346141A - Terahertz image and visible light image mapping fusion method and system - Google Patents
Terahertz image and visible light image mapping fusion method and system Download PDFInfo
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- 238000007500 overflow downdraw method Methods 0.000 title description 3
- 239000011159 matrix material Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000007689 inspection Methods 0.000 claims abstract description 20
- 230000004927 fusion Effects 0.000 claims abstract description 11
- 238000003491 array Methods 0.000 claims description 10
- 238000003384 imaging method Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 5
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- G01V8/00—Prospecting or detecting by optical means
- G01V8/005—Prospecting or detecting by optical means operating with millimetre waves, e.g. measuring the black losey radiation
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention provides a method and a system for mapping and fusing a terahertz image and a visible light image, wherein the method comprises the following steps: obtaining a visible light image and a first terahertz image of a target; obtaining the distance from the target to a security check instrument; selecting a single mapping matrix closest to the target from preset single mapping matrix groups with different distances; mapping the first terahertz image through the selected single mapping matrix to obtain a second terahertz image; finding a target contour in the second terahertz image to generate a mask image; and overlapping the second terahertz image and the mask image onto the visible light image to complete fusion. According to the method, the terahertz image and the visible light image are processed through the single mapping matrix fusion, so that the hidden object inspection sensory degree of security personnel can be improved, the position of suspicious contraband can be accurately positioned, and the security inspection efficiency is improved. Meanwhile, compared with a complex algorithm in the prior art, the method is simple and efficient, and the real-time performance of the original system is not influenced.
Description
Technical Field
The invention relates to a terahertz imaging technology, in particular to a terahertz image and visible light image mapping fusion method and system.
Background
The millimeter wave/terahertz security inspection technology is a novel human body security inspection technology which is started in recent years and can perform non-contact security inspection on a human body by utilizing millimeter wave/terahertz waves. However, due to the imaging characteristics of the terahertz image, the appearance features of the detected person are seriously lost. Although the hidden objects are not easy to detect in the visible light image, the visible light image contains abundant appearance features, and if the hidden object information of the terahertz image is fused with the appearance information of the visible light image, the applicability of the terahertz security check instrument is stronger. However, most of the existing millimeter wave/terahertz security inspection equipment separately and independently display the visible light image and the terahertz image without information fusion, and reduces the hidden object inspection sensory feeling of security inspection personnel to a certain extent.
In addition, since the mounting positions and the view angles of the terahertz security inspection instrument and the camera are not consistent, the sizes, the proportions and the image contents of the images obtained by the terahertz security inspection instrument and the camera are not completely consistent, and therefore, the terahertz security inspection instrument and the camera need to be corrected to be similar as much as possible. In the prior art, methods for performing space-time mapping by using algorithms exist, but the methods are complex and large in calculation amount, so that the detection has time delay.
Disclosure of Invention
The invention aims to provide a simple and efficient mapping and fusing method and system for a terahertz image and a visible light image.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
According to an aspect of the invention, a terahertz image and visible light image mapping and fusing method is provided, which comprises the following steps: obtaining a visible light image and a first terahertz image of a target; obtaining the distance from the target to a security check instrument; selecting a single mapping matrix closest to the target from preset single mapping matrix groups with different distances; mapping the first terahertz image through the selected single mapping matrix to obtain a second terahertz image; finding a target contour in the second terahertz image to generate a mask image; and overlapping the second terahertz image and the mask image onto the visible light image to complete fusion.
In an embodiment, the method for obtaining the preset different distance single mapping matrix set includes: the method comprises the steps that bright point arrays are arranged at different distances and comprise at least 4 bright points, terahertz images and light images of the bright point arrays at different distances are collected, and a single mapping matrix of each distance is obtained through calculation.
In one embodiment, the disposing the bright spot arrays at different distances in the method includes: and arranging a bright spot array at a first distance within the optimal imaging distance range of the current security inspection instrument.
In one embodiment, the optimal imaging distance range in the method is 1.7 m-3.2 m from the security inspection instrument.
In one embodiment, the first distance in the method is between 5cm and 20 cm.
In an embodiment, said first distance in the method is 10 cm.
In one embodiment, the bright spot array in the method comprises 14 to 16 bright spots.
In one embodiment, the bright spots in the method are located in the same plane.
According to another aspect of the invention, a terahertz image and visible light image mapping and fusing system is also provided, which comprises a terahertz security check instrument for acquiring a first terahertz image of a target; the optical camera is used for collecting a visible light image of a target; the distance measuring instrument is used for measuring the distance from the target to the security check instrument; the memory is used for storing the first terahertz image, the visible light image and the distance from the target to the security check instrument; the processor is used for selecting a single mapping matrix closest to the target from preset single mapping matrix groups with different distances; mapping the first terahertz image through the selected single mapping matrix to obtain a second terahertz image; finding a target contour in the second terahertz image to generate a mask image; and overlapping the second terahertz image and the mask image onto the visible light image to complete fusion.
The embodiment of the invention has the beneficial effects that: the terahertz image and the visible light image are processed through the single mapping matrix fusion, so that the hidden object inspection sensory degree of security personnel can be improved, the position of suspicious contraband can be accurately positioned, and the security inspection efficiency is improved. Meanwhile, compared with a complex algorithm in the prior art, the method is simple and efficient, and the real-time performance of the original system is not influenced. Only one distance meter needs to be added to the original system on the basis of hardware, and the reconstruction cost is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
FIG. 1 is a flow chart of a method embodiment of the present invention;
FIG. 2 is a schematic diagram of the operation of an embodiment of the system of the present invention;
wherein: 201-terahertz security check instrument; 202-a variable light camera; 203-a range finder; 204-target.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
As shown in fig. 1, the embodiment discloses a method for mapping and fusing a terahertz image and a visible light image, which includes the following steps:
wherein the target includes both the person and the suspicious contraband on the person. The visible light image is a video image file which is usually acquired by a camera, and the first terahertz image is a terahertz video image file which is acquired by a terahertz security check instrument.
102, obtaining the distance from a target to a security check instrument;
it is to be noted that this distance should be obtained simultaneously with the visible light image and the first terahertz image of the target.
103, selecting a single mapping matrix closest to the target from preset single mapping matrix groups with different distances;
that is, a plurality of single-mapping matrices are stored in advance, and each single-mapping matrix corresponds to one distance. And selecting a single mapping matrix closest to the target according to the distance from the target to the security check instrument.
for example, the processing result (target detection information, concealed object shape information) on the terahertz image at a certain distance is copied to a black blank image having a size completely consistent with that of the image, and the image is mapped to an image having a size consistent with that of the visible light image by using the single-mapping matrix at the certain distance.
105, finding a target contour in the second terahertz image to generate a mask image;
because the image obtained by mapping in step 104 only contains the content copied from the terahertz image, the target profile of the image is very easy to find, and after the profile information is found, a mask image can be generated, the size of the mask image is consistent with that of the visible light image, the target position is black, and the rest positions are white, namely, a black-and-white image with black positions except the position of the mapping target and white positions except the position of the mapping target is obtained;
and step 106, superposing the second terahertz image and the mask image on the visible light image to complete fusion. Namely, the visible light image, the mapping result image (i.e., the second terahertz image) obtained in step 104, and the mask image obtained in step 105 are used as input to perform the superposition operation, so as to obtain the final result image.
According to the method, the terahertz image is corrected through the single-mapping matrix, the size, the proportion, the visual angle and the like of the terahertz image are similar to those of the visible light image as much as possible, and therefore superposition and fusion of the terahertz image and the visible light image can be achieved. According to the difference of the target distance, the single mapping matrix closest to the target is selected from the preset single mapping matrix group for mapping, and the error caused by the distance influence can be reduced to the maximum extent.
Further, in the above method, the predetermined different distance single mapping matrix set is obtained by: the method comprises the steps of arranging bright spot arrays at different distances, wherein the bright spot arrays comprise at least 4 bright spots, collecting terahertz images and light images of the bright spot arrays at all distances, calculating to obtain a single mapping matrix of each distance, and storing the single mapping matrix of each distance.
Preferably, in order to obtain a better imaging effect, the bright spot arrays can be arranged at equal intervals within the optimal imaging distance range of the current security inspection instrument. The optimum imaging distance range is usually 1.7m to 3.2m from the security inspection apparatus, and therefore in this embodiment, calibration tools are placed at regular intervals in the range of 1.7m to 3.2m from the security inspection apparatus, and 14 incandescent bulbs are provided as bright spots on the calibration tools. Compared with 4 bright spots, the mapping accuracy of the single mapping matrix can be improved by 14-16 bright spots. These incandescent lamps should be located in the same plane as much as possible to reduce sampling errors. In addition, the bright spots of the bulbs should be in the central parts of the visible light and terahertz images as much as possible so as to conveniently find the positions of the spots.
The separation distance may be set as required, and is usually between 5cm and 20 cm. The smaller the separation distance, the higher the mapping accuracy, but the larger the calculation amount. Considering the speed and stride of the person, in the embodiment, the sampling interval is 10cm, so that 16 groups of sampling are totally obtained in the range of 1.7m to 3.2m, and 16 corresponding single mapping matrixes are obtained.
As shown in fig. 2, another embodiment of the present invention further provides a system for mapping and fusing a terahertz image and a visible light image, including: the terahertz security check instrument 201 is used for acquiring a first terahertz image of a target; an optical camera 202 for collecting a visible light image of the target; a distance meter 203 for measuring the distance from the target to the security check device; the memory is used for storing the first terahertz image, the visible light image and the distance from the target to the security check instrument; the processor is used for selecting a single mapping matrix closest to the target from preset single mapping matrix groups with different distances; mapping the first terahertz image through the selected single mapping matrix to obtain a second terahertz image; finding a target contour in the second terahertz image to generate a mask image; and overlapping the second terahertz image and the mask image onto the visible light image to complete fusion.
Usually, the terahertz security check instrument is provided with a computer host, so that the memory and the processor of the terahertz security check instrument can be directly adopted. Therefore, only a distance meter needs to be additionally arranged on the existing terahertz system on the hardware of the system, and the modification cost is low.
When the distance D of the target 204 is measured by the distance meter 203, the distance D is compared with the distance of each single mapping matrix, and the closest single mapping matrix (for example, A in the figure) is selected6) And performing mapping calculation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only a preferred example of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (9)
1. A terahertz image and visible light image mapping and fusing method is characterized by comprising the following steps:
obtaining a visible light image and a first terahertz image of a target;
obtaining the distance from the target to a security check instrument;
selecting a single mapping matrix closest to the target from preset single mapping matrix groups with different distances;
mapping the first terahertz image through the selected single mapping matrix to obtain a second terahertz image;
finding a target contour in the second terahertz image to generate a mask image;
and overlapping the second terahertz image and the mask image onto the visible light image to complete fusion.
2. The terahertz image and visible light image mapping and fusing method as claimed in claim 1, wherein the preset different distance single mapping matrix set is obtained by: the method comprises the steps that bright point arrays are arranged at different distances and comprise at least 4 bright points, terahertz images and light images of the bright point arrays at different distances are collected, and a single mapping matrix of each distance is obtained through calculation.
3. The terahertz image and visible light image mapping and fusing method as claimed in claim 2, wherein the disposing of the bright spot arrays at different distances comprises: and arranging a bright spot array at a first distance within the optimal imaging distance range of the current security inspection instrument.
4. The terahertz image and visible light image mapping and fusing method as claimed in claim 3, wherein the optimal imaging distance range is 1.7 m-3.2 m from a security inspection instrument.
5. The terahertz image and visible light image mapping and fusing method according to claim 4, wherein the first distance is 5 cm-20 cm.
6. The terahertz image and visible light image mapping and fusing method according to claim 5, wherein the first distance is 10 cm.
7. The terahertz image and visible light image mapping and fusing method as claimed in claim 2, wherein the bright spot array comprises 14-16 bright spots.
8. The terahertz image and visible light image mapping and fusing method according to claim 7, wherein the bright spots are located on the same plane.
9. A terahertz image and visible light image mapping and fusing system is characterized by comprising:
the terahertz security check instrument is used for acquiring a first terahertz image of a target;
the optical camera is used for collecting a visible light image of a target;
the distance measuring instrument is used for measuring the distance from the target to the security check instrument;
the memory is used for storing the first terahertz image, the visible light image and the distance from the target to the security check instrument;
the processor is used for selecting a single mapping matrix closest to the target from preset single mapping matrix groups with different distances; mapping the first terahertz image through the selected single mapping matrix to obtain a second terahertz image; finding a target contour in the second terahertz image to generate a mask image; and overlapping the second terahertz image and the mask image onto the visible light image to complete fusion.
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| CN116818704A (en) * | 2023-03-09 | 2023-09-29 | 苏州荣视软件技术有限公司 | High-precision full-automatic detection method, equipment and medium for semiconductor flaw AI |
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