CN109471198A - A kind of complete polarization millimeter wave/terahertz detection meter, the pattern recognition device including it and its method - Google Patents
A kind of complete polarization millimeter wave/terahertz detection meter, the pattern recognition device including it and its method Download PDFInfo
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- CN109471198A CN109471198A CN201811654363.1A CN201811654363A CN109471198A CN 109471198 A CN109471198 A CN 109471198A CN 201811654363 A CN201811654363 A CN 201811654363A CN 109471198 A CN109471198 A CN 109471198A
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- 230000010287 polarization Effects 0.000 title claims abstract description 226
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 30
- 238000003909 pattern recognition Methods 0.000 title claims description 10
- 238000002156 mixing Methods 0.000 claims abstract description 59
- 230000003321 amplification Effects 0.000 claims abstract description 39
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 39
- 238000001914 filtration Methods 0.000 claims abstract description 35
- 230000010355 oscillation Effects 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000012549 training Methods 0.000 claims description 30
- 238000012545 processing Methods 0.000 claims description 23
- 238000013528 artificial neural network Methods 0.000 claims description 11
- 230000004927 fusion Effects 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
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- 238000003384 imaging method Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/24—Classification techniques
- G06F18/241—Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches
- G06F18/2413—Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches based on distances to training or reference patterns
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V2201/00—Indexing scheme relating to image or video recognition or understanding
- G06V2201/05—Recognition of patterns representing particular kinds of hidden objects, e.g. weapons, explosives, drugs
Abstract
This application provides a kind of complete polarization millimeter wave/terahertz detection meters, comprising: receiving antenna is configured as receiving millimeter wave/terahertz wave signal from checked object；Polarization separator is configured as the received millimeter wave of institute/terahertz wave signal carrying out polarization separation, forms horizontal polarization signals and vertical polarization signal；Horizontal channel portion and vertical channel portion are configured as accordingly being mixed the horizontal polarization signals or the vertical polarization signal with local oscillation signal wherein each channel part includes: frequency mixer；Intermediate frequency filtering enlarging section is configured as carrying out low noise amplification, filtering, power amplification to mixing gained signal；And complex correlator, it is configured as carrying out multiple correlation operation, and output level polarized signal, vertical polarization signal and multiple correlation operation signal according to the amplified signal of intermediate frequency filtering.
Description
Technical field
The present invention relates to safety check instrument field of image recognition, it is more particularly related to a kind of complete polarization millimeter wave/too
Dress is imaged in Hertzion radiation surveymeter, the safety check instrument that image recognition is carried out using the complete polarization millimeter wave/terahertz emission surveymeter
It sets and method.
Background technique
In the millimeter wave based on focal plane imaging/terahertz imaging safety check apparatus, direct detection radiometer is generallyd use
Or superhet indirect detection radiometer to carry out safety check to the concealment object of human body and its carrying.But due to it is existing this two
The reason of pyramidal horn antenna used on kind radiometer, it can only all detect single polarization information.Due to human body and its carrying
The radiation characteristic of concealment object there is more complicated polarization characteristic, with human body/object geometry and internal medium
Dielectric constant and the spatial distribution state of temperature have relationship, so if detected using single polarized radiation meter,
Then a large amount of polarization informations of different concealment objects will be lost, and only have for the receiving efficiency maximum of the frequency spectrum of object radiation
50%, concealment object cannot be accurately identified when thereby resulting in safety check.
Further, since the low-noise amplifier in current complete polarization radiometer is suitable for detecting the radiation of 200GHz
Therefore limitation when millimeter wave/THz wave frequency is greater than 200GHz, cannot carry out accurately image and identification to object.
Summary of the invention
According to the first aspect of the invention, a kind of complete polarization millimeter wave/terahertz detection meter is provided, may include: to connect
Antenna is received, can be configured as and receive millimeter wave/terahertz wave signal from checked object；Polarization separator can be matched
It is set to and the received millimeter wave of institute/terahertz wave signal is subjected to polarization separation, form horizontal polarization signals and vertical polarization signal；
Horizontal channel portion and vertical channel portion can be configured as accordingly wherein each channel part includes: frequency mixer by the level
Polarized signal or the vertical polarization signal are mixed with local oscillation signal；Intermediate frequency filtering enlarging section can be configured as to mixed
Frequency gained signal carries out low noise amplification, filtering, power amplification；And complex correlator, it can be configured as according to through low noise
The signal obtained after amplification, filtering, power amplification carries out multiple correlation operation, and output level polarized signal, vertical polarization signal
And multiple correlation operation signal.
According in a first aspect, intermediate frequency filtering enlarging section may include intermediate frequency low-noise amplifier, can be configured as pair
Mixing gained signal carries out intermediate frequency low noise amplification.
According in a first aspect, intermediate frequency filtering enlarging section may include intermediate-frequency filter, can be configured as to through low noise
The amplified signal of sound carries out intermediate frequency filtering.
According in a first aspect, intermediate frequency filtering enlarging section can also include IF power amplifier, can be configured as pair
Signal after intermediate frequency filtering carries out EF power amplification.
According to first aspect, wherein the multiple correlation operation signal may include left-hand circular polarization signal and dextrorotation entelechy
Change signal.
According to a second aspect of the present application, a kind of complete polarization millimeter wave/terahertz detection method is provided, the method can
To include the following steps: to receive millimeter wave/terahertz wave signal from checked object；By the received millimeter wave/Terahertz of institute
Wave signal carries out polarization separation, forms horizontal polarization signals and vertical polarization signal；Accordingly by the horizontal polarization signals or
The vertical polarization signal is mixed with local oscillation signal；Signal after mixing carries out intermediate frequency filtering amplification；And according to intermediate frequency
Signal after filter and amplification carries out multiple correlation operation, and output level polarized signal, vertical polarization signal and multiple correlation operation
Signal.
According to second aspect, wherein it may include: to described mixed that signal obtained by described pair of mixing, which carries out intermediate frequency filtering amplification,
Signal after frequency carries out intermediate frequency low noise amplification.
According to second aspect, wherein it can also include: to intermediate frequency that signal obtained by described pair of mixing, which carries out intermediate frequency filtering amplification,
Signal after low noise amplification carries out intermediate frequency filtering.
According to second aspect, wherein it can also include: to intermediate frequency that signal obtained by described pair of mixing, which carries out intermediate frequency filtering amplification,
Filtered signal carries out EF power amplification.
According to second aspect, wherein the multiple correlation operation signal may include left-hand circular polarization signal and dextrorotation entelechy
Change signal.
According to the third aspect of the application, a kind of pattern recognition device is provided, may include: condenser lens, be configured
To receive millimeter wave/terahertz wave signal from checked object；The millimeter wave of the complete polarization according to first aspect/Terahertz
Surveymeter, is configured as millimeter wave/terahertz wave signal described in complete polarization, obtain horizontal polarization signals, vertical polarization signal, with
And multiple correlation operation signal；Signal processor, be configured as according to the horizontal polarization signals, the vertical polarization signal, with
And the multiple correlation operation signal forms blending image；Neural network recognizer is configured as: continuously according to the blending image
It is trained study, obtains the training pattern of continuous renewal；And image recognition is carried out based on the training pattern；And image
Display is configured as showing identified image.
According to the third aspect, the signal processor be can be additionally configured to: based on the horizontal polarization signals, it is described hang down
Straight polarized signal and the multiple correlation operation image formation go out multiple images；Determine whether described multiple images are complete
Image, wherein if described multiple images are complete images, described image is fused to fusion figure by the signal processor
Picture；And if described multiple images are not complete images, the signal processor abandons this group of image.
According to the third aspect, the neural network recognizer can be configured as based on described multiple images and described melt
It closes image and is constantly trained study.
According to the third aspect, wherein if carrying out image recognition based on the training pattern may include: the fusion figure
As being greater than first threshold with the matching degree of the training pattern, then it is assumed that the blending image is identified；If the fusion
The matching degree of image and the training pattern is less than or equal to first threshold, then it is assumed that and the blending image cannot be identified,
Then abandon this group of image.
According to the third aspect, wherein when the matching degree of the blending image and the training pattern is less than or equal to the
When one threshold value, the signal processor be based on next group of horizontal polarization signals, vertical polarization signal and multiple correlation operation signal into
Row identification, until the number that such identifying processing continuously performs is greater than second threshold.
According to the third aspect, wherein the first threshold can be 90%.
According to the third aspect, wherein the second threshold can be 50.
According to the third aspect, wherein when the identifying processing continuously performs number greater than the second threshold, check institute
State complete polarization radiating curtain whether failure or by strong jamming.
According to the fourth aspect of the application, a kind of image-recognizing method is provided, may comprise steps of: focusing projection
Millimeter wave/terahertz wave signal from checked object；Millimeter wave/terahertz wave signal described in complete polarization obtains horizontal polarization
Signal, vertical polarization signal and multiple correlation operation signal；Signal processor, be configured as according to the horizontal polarization signals,
The vertical polarization signal and the multiple correlation operation signal form blending image；Neural network recognizer is configured as:
Study is continuously trained according to the blending image, obtains the training pattern of continuous renewal；And it is based on the training pattern
Carry out image recognition；And image display, it is configured as showing identified image.
According to fourth aspect, the method can also include: to be believed based on the horizontal polarization signals, the vertical polarization
Number and the multiple correlation operation image formation go out multiple images；Determine whether described multiple images are complete images,
In, if described multiple images are complete images, described image is fused to blending image by the signal processor；And
If described multiple images are not complete images, the signal processor abandons this group of image.
According to fourth aspect, the method can also include: continuous based on described multiple images and the blending image
It is trained study.
According to fourth aspect, wherein if carrying out image recognition based on the training pattern may include: the fusion figure
As being greater than first threshold with the matching degree of the training pattern, then it is assumed that the blending image is identified；If the fusion
The matching degree of image and the training pattern is less than or equal to first threshold, then it is assumed that and the blending image cannot be identified,
Then abandon this group of image.
According to fourth aspect, wherein when the matching degree of the blending image and the training pattern is less than or equal to the
When one threshold value, identified based on next group of horizontal polarization signals, vertical polarization signal and multiple correlation operation signal, until
Until the number that such identifying processing continuously performs is greater than second threshold.
According to fourth aspect, wherein the first threshold can be 90%.
According to fourth aspect, wherein the second threshold can be 50.
According to fourth aspect, wherein when the number that the identifying processing continuously performs is greater than the second threshold, check
Whether break down or be interfered when millimeter wave/THz wave described in complete polarization.
According to the 5th of the application aspect, provide a kind of computer program product, can from downloaded and/or
It is recorded on the medium that can be read by computer and/or can be executed by processor, the computer program product includes using
In the program code instruction of the method according to second aspect or fourth aspect of realization.
According to the 5th of the application the aspect, a kind of non-transitory computer-readable medium is provided, including record is on it
And the computer program product that can be run by processor, the computer program product includes for realizing according to second aspect
Or the program code instruction of method described in fourth aspect.
Various aspects based on the application, the precision identified to checked object significantly improve, and institute knows at for image
The resolution ratio of other image significantly improves, up to millimeter rank.
Detailed description of the invention
Fig. 1 shows complete polarization millimeter wave/terahertz emission surveymeter block diagram according to prior art.
Fig. 2 a shows the schematic block diagram of complete polarization millimeter wave/terahertz emission surveymeter according to an embodiment of the present invention.
Fig. 2 b shows the detailed example frame of complete polarization millimeter wave/terahertz emission surveymeter according to an embodiment of the present invention
Figure.
Fig. 3, which is shown, according to an embodiment of the present invention utilizes complete polarization millimeter wave/terahertz emission surveymeter to carry out image
The block diagram of the safety check instrument device of identification.
Fig. 4 shows complete polarization millimeter wave according to an embodiment of the present invention/terahertz detection meter 1 and forms complete polarization signal
Flow chart.
Fig. 5 shows utilization according to an embodiment of the present invention complete polarization millimeter wave/Terahertz according to an embodiment of the present invention
The flow chart of surveymeter progress image recognition.
Fig. 6 shows the flow chart according to an embodiment of the present invention for carrying out image co-registration process.
Fig. 7 shows utilization according to an embodiment of the present invention complete polarization millimeter wave/Terahertz according to an embodiment of the present invention
Another exemplary flow chart of surveymeter progress image recognition.
Specific embodiment
Specific embodiments of the present invention are described more fully below, it should be noted that the embodiments described herein is served only for illustrating
Illustrate, is not intended to restrict the invention.In the following description, in order to provide a thorough understanding of the present invention, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that: this hair need not be carried out using these specific details
It is bright.In other instances, in order to avoid obscuring the present invention, well known circuit, material or method are not specifically described.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
: a particular feature, structure, or characteristic described in conjunction with this embodiment or example is comprised at least one embodiment of the invention.
Therefore, the phrase " in one embodiment ", " in embodiment ", " example " occurred in each place of the whole instruction
Or " example " is not necessarily all referring to the same embodiment or example.Furthermore, it is possible in any suitable combination and/or sub-portfolio will be specific
Feature, structure or characteristic combine in one or more embodiment or examples.In addition, those of ordinary skill in the art should manage
Solution, attached drawing is provided to the purpose of explanation provided herein, and attached drawing is not necessarily drawn to scale.It should be appreciated that working as
When claiming element " being couple to " or " being connected to " another element, it, which can be, is directly coupled or connected another element or can deposit
In intermediary element.On the contrary, intermediary element is not present when claiming element " being directly coupled to " or " being directly connected to " another element.
Identical appended drawing reference indicates identical element.Term "and/or" used herein includes the item that one or more correlations are listed
Any and all combinations of purpose.
By blackbody radiation theory it is found that millimeter wave/THz wave of target emanation is a kind of noncoherent millimeter wave/terahertz
Hereby wave has complicated polarization characteristic, therefore can be obtained by the polarization information in target object radiation signal more
Information about target.When being detected with traditional single polarization radiometer to a variety of different objects, due to different objects
Between may have similar characteristic, therefore can not will not jljl when single polarization radiometer collects the similar radiation information
Body distinguishes.
Therefore, joined by using 4 Stokes of complete polarization millimeter wave/terahertz emission surveymeter detection checked object
Number, can significantly improve the accuracy identified to checked object.However, as shown in Figure 1, complete polarization millimeter used at present
In wave/terahertz emission surveymeter, in horizontal polarization channel and vertical polarization channel, low-noise amplifier be placed in frequency mixer it
Before, and the frequency range that low-noise amplifier is applicable at present is 200GHz or less.Therefore, complete polarization millimeter used at present
The case where frequency that wave/terahertz emission surveymeter is only applicable to the signal that polarization separator receives is less than 200GHz, and work as
When the frequency for the signal that polarization separator receives is greater than 200GHz, existing complete polarization millimeter wave/terahertz emission surveymeter
Then no longer it is applicable in.
Based on this, present applicant proposes a kind of complete polarization millimeter wave suitable for any frequency range/terahertz emissions to visit
Survey meter.
Fig. 2 a shows the outline frame of complete polarization millimeter wave/terahertz emission surveymeter 100 according to an embodiment of the present invention
Figure.
As shown in Figure 2 a, the complete polarization millimeter wave/terahertz emission surveymeter 100 and Fig. 1 of embodiment according to the present invention
In the millimeter wave of complete polarization according to prior art/terahertz emission surveymeter the difference is that horizontal polarization channel part and
Vertical polarization channel part and intermediate frequency filtering enlarging section.It will be described in detail below about the difference, and for ability
The other well known component of field technique personnel is not described in detail, in case unnecessary obscure design of the invention.
Horizontal polarization channel part/vertical polarization channel part in complete polarization millimeter wave/terahertz emission surveymeter 100 can be with
Including frequency mixer.
As complete polarization millimeter wave/terahertz emission surveymeter in the prior art, frequency mixer is configured as to pass through
The horizontal polarization signals that polarization separator is isolated/vertical polarization signal is mixed with the local oscillation signal separated by power splitter.
Here, function, the attribute etc. of frequency mixer is no longer described in detail.
In the present embodiment, the horizontal polarization signals to polarize out/vertical polarization signal enters horizontal polarization channel part/vertical
It after POLARIZATION CHANNEL portion, is mixed first via frequency mixer with local oscillation signal, the complete polarization of the prior art can be overcome completely
Millimeter wave/terahertz emission surveymeter is in the case where the horizontal polarization signals to polarize out/vertical polarization signal is greater than 200GHz
Not applicable problem.This is because the polarized signal that can will be greater than 200GHz is mixed down tens MHz via the processing of frequency mixer
To the signal of 100GHz.
May be used also horizontal polarization channel part/vertical polarization channel part in complete polarization millimeter wave/terahertz emission surveymeter 100
To include intermediate frequency filtering enlarging section, it is configured as optimizing the lower signal of frequency after mixing.The optimization may include
Signal after amplification mixing, and the signal after mixing is denoised.
Fig. 2 b shows the detailed example frame of complete polarization millimeter wave/terahertz emission surveymeter according to an embodiment of the present invention
Figure.
As shown in Figure 2 b, intermediate frequency filtering enlarging section may include intermediate frequency low-noise amplifier, be configured as to after mixing
Resulting signal carries out intermediate frequency low noise amplification.
Intermediate frequency filtering enlarging section may include intermediate-frequency filter, be configured as carrying out the signal after intermediate frequency low noise amplification
Intermediate frequency filtering.
Intermediate frequency filtering enlarging section may include IF power amplifier, be configured as in the progress of intermediate frequency filtered signal
Frequency power amplification.
Although intermediate frequency low-noise amplifier, intermediate-frequency filter and IF power amplifier are described and are shown in the application
Out to be sequentially connected, it should be appreciated to those skilled in the art that can realize this in the case where lacking one of them
Application, or can set-up mode in a different order realize the application.
Based on the horizontal channel portion and vertical channel portion, Yi Jizhong in complete polarization millimeter wave/terahertz emission surveymeter 100
The configuration in frequency filter and amplification portion, complex correlator can with the horizontal polarization signals (Th) of output low noise, vertical polarization signal (Tv),
Left-hand circular polarization signal (T3) and right-handed circular polarization signal (T4), so as to promote the more accurately figure to checked object
As being identified.
It follows that in the case where configuration as Fig. 2 a and Fig. 2 b, complete polarization millimeter according to an embodiment of the present invention
Wave/terahertz emission surveymeter not only can be adapted for horizontal polarization signals/vertical polarization signal of any frequency, but also can
It is final to obtain complete polarization signal more resulting than the millimeter wave of complete polarization shown in Fig. 1/terahertz emission surveymeter preferably full pole
Change signal, is more advantageous to and more accurately identifies image.
Fig. 3 shows utilization according to an embodiment of the present invention complete polarization millimeter wave according to the present invention/terahertz emission and visits
Survey the block diagram that meter carries out the safety check instrument device of image recognition.As shown in figure 3, safety check instrument device according to the embodiment may include gathering
Focus lens 3, complete polarization radiometer array 4, signal processor 5, neural network recognizer 6 and image display 7.
Condenser lens 3 can be configured as continuously receive from be subjected to safety check object (for example, human body 1 and its carry
Object) millimeter wave/THz wave 2, and the millimeter wave/THz wave 2 received is focused on into complete polarization radiometer array
For the detection of complete polarization radiometer array 4 on 4.Millimeter wave/THz wave can be the millimeter due to checked object spontaneous radiation
Wave/THz wave, or can be the millimeter wave/terahertz for being radiated on checked object and reflecting via millimeter wave/THz source
Hereby wave.When millimeter wave/THz wave is millimeter wave/THz wave of reflection, millimeter wave/THz source quantity can be one
It is a or multiple.
Complete polarization radiometer array 4 may include one or more complete polarization millimeter wave/Terahertz spokes according to the present invention
Penetrate surveymeter 100, included complete polarization millimeter wave/terahertz emission surveymeter can be arranged to linear array or face array
Form.
100 complete polarization millimeter wave of complete polarization millimeter wave/terahertz emission surveymeter/100 signal of terahertz emission surveymeter
Processing unit 5 can be configured as: the horizontal polarization signals Th exported via complete polarization radiometer array 4, vertical polarization are believed
Number Tv, left-hand circular polarization signal T3 and right-handed circular polarization signal T4 are combined (for example, will be via complete polarization radiometer battle array
Th, Tv, T3, T4 phase that column 4 export, which sum it up, subtracts each other), the signal after being then based on Th, Tv, T3, T4 and combination enters image
Fusion.
Optionally, in order to further obtain the blending image of good quality, signal processor be can be additionally configured to: to water
Flat polarized signal Th, vertical polarization signal Tv, left-hand circular polarization signal T3 and right-handed circular polarization signal T4 are carried out at denoising
Reason；Feature extraction is carried out to each signal after denoising, and they are registrated；By the horizontal polarization signals after registration
Th, vertical polarization signal Tv, left-hand circular polarization signal T3 and right-handed circular polarization signal T4 are combined, and obtain combination signal.
In addition, being generated at signal processor when only checked object is completely within the field range of condenser lens 3
Blending image is just available.For example, when except the arm of checked object being in visual field, the fusion of generation at signal processor
The image that arm is lacked in image, the image recognition carried out based on such blending image cause to carry at missing inspection arm
Concealment object risk.Therefore, signal processor can be additionally configured to: respectively believe horizontal polarization signals Th, vertical polarization
Number Tv, left-hand circular polarization signal T3, right-handed circular polarization signal T4 and combination signal are imaged, in each image of determination
Checked object image it is whether complete, if in each image the image of checked object be it is complete, utilize data fusion
Method be based on horizontal polarization signals Th, vertical polarization signal Tv, left-hand circular polarization signal T3, right-handed circular polarization signal T4 and
It combines signal and carries out data fusion formation blending image；If the image of checked object is imperfect (for example, certain in each image
The image of arm is not shown), then abandon this group of horizontal polarization signals Th, vertical polarization signal Tv, left-hand circular polarization signal T3, the right side
Hand circular polarization signal T4 and combination signal.
In addition, when signal processor is digital signal processor, due to the level exported from complete polarization radiometer array 4
Polarized signal Th, vertical polarization signal Tv, left-hand circular polarization signal T3 and right-handed circular polarization signal T4 are analog signal,
Therefore, analog-digital converter can be set before signal processor, has been configured as the mould that will be exported via complete polarization radiometer array 4
Quasi- signal is converted to digital signal.
In addition, when the level of received horizontal polarization signals and vertical polarization signal be able to carry out less than analog-digital converter
Analog signal amplifier can be set when the level of analog-to-digital conversion, before analog-digital converter, for by horizontal polarization signals and
The level of vertical polarization signal is amplified to the level that analog-digital converter is able to carry out analog-to-digital conversion.
Neural network recognizer 6 can be configured as: blending image is only received from signal processor 5 or based on combination before
Then each image and blending image formed by polarized signal after polarized signal, combination instruct the received image of institute
Practice study, forms training pattern；The image received is matched with training pattern, if matching rate is all larger than first threshold
(for example, 90%), then it is assumed that received image is available, sends the picture signal matched to image display 7 to carry out
It has been shown that, if matching rate is less than first threshold, then it is assumed that the received effective image of institute sends notification signal to signal processor,
Indication signal processor 5 continues to send image to neural network recognizer 6, and thus neural network recognizer 6 repeats reception
And matching process.
Such matching process can execute multiple (for example, 50 times).When this repetitive process is more than second threshold, mind
It sends and notifies to complete polarization radiometer array 4 through network recognizer 6, to check whether complete polarization radiometer array 4 is disturbed
Or there are problems.
Image display 7 can be configured as from neural network recognizer 6 and receive the image of successful match to be shown.
Fig. 4 shows complete polarization millimeter wave according to an embodiment of the present invention/terahertz detection meter 1 and forms complete polarization signal
Flow chart.
At step 41, millimeter wave/THz wave of the object from human body and its carrying is received.
At step 42, received millimeter wave/THz wave is subjected to polarization separation, obtains horizontal polarization signals and vertical
Polarized signal.
Horizontal polarization signals or vertical polarization signal are mixed with local oscillator respectively at step 43, after being mixed
Signal.
At step 44, intermediate frequency low noise amplification is carried out to mixing gained signal.
At step 45, intermediate frequency filtering is carried out to the signal after intermediate frequency low noise amplification.
At step 46, EF power amplification is carried out to the signal after intermediate frequency filtering.
At step 47, multiple correlation operation is carried out according to the amplified horizontal polarization signals of intermediate frequency and vertical polarization signal,
Output level polarized signal Th, vertical polarization signal Tv, left-hand circular polarization signal T3 and right-handed circular polarization signal T4.
Fig. 5, which is shown, according to an embodiment of the present invention utilizes complete polarization millimeter wave/terahertz detection meter 1 to carry out image recognition
Flow chart.
At step 51, millimeter wave/THz wave from checked object is received.
The processing at step 52 place is that the millimeter wave of complete polarization shown in Fig. 4/terahertz detection meter 1 forms complete polarization letter
Number flow chart.As a result, via step 52, horizontal polarization signals Th, vertical polarization signal Tv, left-hand circular polarization letter can be obtained
Number T3 and right-handed circular polarization signal T4.
At step 53, the horizontal polarization signals Th, the vertical polarization signal Tv, left-hand circular polarization that will be obtained at step 52
Signal T3 and right-handed circular polarization signal T4 are combined, and are imaged based on the signal after combination front signal and combination,
Formed each image is subjected to image co-registration, generates blending image.
In addition, step 53 place may include multiple steps, this will be described in detail with reference to Fig. 6.
Optionally, when the processing carried out at step 53 is the processing carried out for digital signal, in step 52 and 53
Between may include step 523-1, Th, Tv, T3 and T4 for generating via step 52 are converted into number at step 523-1
Word signal.
Optionally, when via step 52 processed Th, Tv, T3 and T4 be not enough at step 523-1 carry out modulus
It can also include step 523-2 between step 52 and step 523-1, at step 523-2, being used for will be via step when conversion
52 Th, Tv, T3 and T4 generated carry out analog signal amplification.
At step 54, according to based on each image formed by the polarized signal before combination and the polarized signal after combination,
And blending image is trained study, obtains training pattern, and the object in image is identified based on training pattern.
Wherein, when being identified, step 55 can be executed.At step 55, it can will be believed based on the polarization before combination
Number and combination after polarized signal formed by each image and blending image matched with training pattern.If matching rate
Greater than first threshold (for example, being more than or equal to 90%), then processing proceeds to step 56, shows each image (packet of successful match
Each image and blending image formed by the polarized signal after polarized signal and combination before including based on combination).If matching
Rate is less than first threshold, then abandons this group of image, processing returns to step 53 place, continue to next group of Th, Tv, T3 and T4
Carry out the processing of step 53 to step 55.
Fig. 6 shows the example flow diagram of image co-registration step 53 according to an embodiment of the present invention.
It may include multiple steps in step 53.Wherein, at step 531, to by step 52 or optional step
Horizontal polarization signals Th, vertical polarization signal Tv, left-hand circular polarization signal T3 and the dextrorotation entelechy that 523-1/523-2 is obtained
Change signal T4 denoised, feature extraction and registration process.
At step 532, Th, Tv, T3, T4 after registration are combined (for example, addition and subtraction obtain addition
Signal and subtraction signal).
At step 533, based on before registration Th, Tv, T3, T4 and combination signal multiple images are imaged out.
At step 534, determine whether each image formed at step 533 is complete image.If not complete
Whole image, then abandon this group of signal, and processing is returned to step 531, at step 531 again to next group of Th, Tv,
T3, T4 carry out above-mentioned 531 to 534 processing.If it is complete image, then processing proceeds to step 535, is melted using data
Conjunction method generates blending image according to each image, the polarized signal after polarized signal and combination before thus obtaining based on combination
The multiple images and blending image of generation.
It whether is complete image by each image of determination, it is possible to prevente effectively from being made since human body is not fully irradiated
The consequence not being imaged at belongings.
Fig. 7, which is shown, according to an embodiment of the present invention utilizes complete polarization millimeter wave/terahertz detection meter 1 to carry out image recognition
Another exemplary flow chart.
In this example, step 51-56 is described by reference to Fig. 5, is not repeated to describe herein, to cause not
It is necessary fuzzy.
In this example, as previously mentioned, processing proceeds to step 57 in the unsuccessful situation of matching at step 55,
Increase by 1 with counting how many times (since 0).When increase by 1 after matching times count still less than be equal to second threshold (for example, 50
It is secondary) when, continue step 53-55, and processing proceeds to step 56 in successful match, shows each image of successful match.
Matching times after increasing by 1, which count, is greater than second threshold successful match not yet, then processing proceeds to step 58 place,
It checks at complete polarization radiating curtain 4 with the presence or absence of failure or by strong jamming.When there are failure or by strongly disturbing situation
Under, after checking and repair failure or avoiding interference, continue step 51.
Although showing multiple components in above each block diagram, it should be appreciated to those skilled in the art that can lack
Few one or more components will realize the embodiment of the present invention in the case where the combination of certain components.
Although each step is described above according to sequence shown in the drawings, those skilled in the art are answered
Work as understanding, each step can execute in a different order, or can be in one or more in no above-mentioned steps
The embodiment of the present invention is realized in the case where a step.
According to foregoing teachings it is appreciated that the electronic building brick of one or more system or equipment can include but is not limited to
A few processing unit, memory and the communication bus that the various components including memory are couple to processing unit
Or communication device.System or equipment may include or accessible various device-readable mediums.System storage may include easy
The device-readable storage medium of the property lost and/or nonvolatile memory form is (for example, read-only memory (ROM) and/or random
It accesses memory (RAM)).By way of example, and not limitation, system storage can also include operating system, using journey
Sequence, other program modules and program data.
Embodiment can be implemented as system, method or program product.Therefore, embodiment can using full hardware embodiment or
Person includes the form of the embodiment of software (including firmware, resident software, microcode etc.), they may be collectively referred to herein as
Circuit, " module " or " system ".In addition, embodiment can be taken is embodied at least the one of device-readable program code on it
The form of the program product embodied in a device-readable medium.
The combination of device-readable storage medium can be used.In the context of this document, device-readable storage medium
(" storage medium ") can be any tangible non-signal medium, may include or stores by being configured to by instruction execution system
System, device or equipment use or the program of program code composition in connection.For the purpose of this disclosure, storage medium
Or equipment should be interpreted non-transitory, i.e., do not include signal or propagation medium.
The disclosure is presented for the purpose of illustration and description, but is not intended to exhaustion or limitation.It is many modification and
Variation will be apparent those of ordinary skill in the art.Selection and description embodiment so as to principle of specification and practical application,
And make the skilled artisan will appreciate that having this public affairs of the various modifications for being suitable for desired special-purpose
The various embodiments opened.
Claims (28)
1. a kind of complete polarization millimeter wave/terahertz detection meter, comprising:
Receiving antenna is configured as receiving millimeter wave/terahertz wave signal from checked object；
Polarization separator is configured as the received millimeter wave of institute/terahertz wave signal carrying out polarization separation, forms horizontal polarization
Signal and vertical polarization signal；
Horizontal channel portion and vertical channel portion, wherein each channel part includes:
Frequency mixer is configured as accordingly mixing the horizontal polarization signals or the vertical polarization signal with local oscillation signal
Frequently；
Intermediate frequency filtering enlarging section is configured as carrying out low noise amplification, filtering, power amplification to mixing gained signal；And
Complex correlator is configured as carrying out multiple correlation fortune according to through signal obtained from low noise amplification, filtering, power amplification
It calculates, and output level polarized signal, vertical polarization signal and multiple correlation operation signal.
2. complete polarization millimeter wave/terahertz detection meter according to claim 1, the intermediate frequency filtering enlarging section include:
Intermediate frequency low-noise amplifier is configured as carrying out intermediate frequency low noise amplification to mixing gained signal.
3. complete polarization millimeter wave/terahertz detection meter according to claim 2, the intermediate frequency filtering enlarging section further include:
Intermediate-frequency filter is configured as carrying out intermediate frequency filtering to the signal after low noise amplification.
4. complete polarization millimeter wave/terahertz detection meter according to claim 3, the intermediate frequency filtering enlarging section further include:
IF power amplifier is configured as carrying out EF power amplification to the filtered signal of intermediate frequency.
5. complete polarization millimeter wave/terahertz detection meter according to claim 1, wherein the multiple correlation operation signal packet
Include left-hand circular polarization signal and right-handed circular polarization signal.
6. a kind of complete polarization millimeter wave/terahertz detection method, described method includes following steps:
Receive millimeter wave/terahertz wave signal from checked object；
The received millimeter wave of institute/terahertz wave signal is subjected to polarization separation, forms horizontal polarization signals and vertical polarization signal；
Accordingly the horizontal polarization signals or the vertical polarization signal are mixed with local oscillation signal；
Intermediate frequency filtering amplification is carried out to the signal of mixing gained signal；And
Carry out multiple correlation operation according to the amplified signal of intermediate frequency filtering, and output level polarized signal, vertical polarization signal with
And multiple correlation operation signal.
7. complete polarization millimeter wave/terahertz detection method according to claim 6, wherein
It includes: to carry out intermediate frequency low noise amplification to mixing gained signal that signal obtained by described pair of mixing, which carries out intermediate frequency filtering amplification,.
8. complete polarization millimeter wave/terahertz detection method according to claim 7, during signal obtained by described pair of mixing carries out
Frequency filter and amplification further include: intermediate frequency filtering is carried out to the signal after intermediate frequency low noise amplification.
9. complete polarization millimeter wave/terahertz detection method according to claim 8, during signal obtained by described pair of mixing carries out
Frequency filter and amplification includes further include: carries out EF power amplification to the filtered signal of intermediate frequency.
10. complete polarization millimeter wave/terahertz detection method according to claim 6, wherein the multiple correlation operation signal
Including left-hand circular polarization signal and right-handed circular polarization signal.
11. a kind of pattern recognition device, comprising:
Condenser lens is configured as receiving millimeter wave/terahertz wave signal from checked object；
Complete polarization millimeter wave/terahertz detection meter according to any one of claims 1-5, is configured as described in complete polarization
Millimeter wave/terahertz wave signal obtains horizontal polarization signals, vertical polarization signal and multiple correlation operation signal；
Signal processor is configured as being transported according to the horizontal polarization signals, the vertical polarization signal and the multiple correlation
It calculates signal and forms blending image；
Neural network recognizer is configured as:
Study is continuously trained according to the blending image, obtains the training pattern of continuous renewal；And
Image recognition is carried out based on the training pattern；And
Image display is configured as showing identified image.
12. pattern recognition device according to claim 11, the signal processor is also configured to
Go out multiple figures based on the horizontal polarization signals, the vertical polarization signal and the multiple correlation operation image formation
Picture；
Determine whether described multiple images are complete images, wherein
If described multiple images are complete images, described image is fused to blending image by the signal processor；With
And
If described multiple images are not complete images, the signal processor abandons this group of image.
13. pattern recognition device according to claim 12, the neural network recognizer is configured as based on described more
A image and the blending image are constantly trained study.
14. pattern recognition device according to claim 11, in which:
Carrying out image recognition based on the training pattern includes:
If the matching degree of the blending image and the training pattern is greater than first threshold, then it is assumed that the blending image quilt
Identification；
If the matching degree of the blending image and the training pattern is less than or equal to first threshold, then it is assumed that the fusion
Image cannot be identified, then abandon this group of image.
15. pattern recognition device according to claim 14, in which:
When the matching degree of the blending image and the training pattern is less than or equal to first threshold, the signal processor
It is identified based on next group of horizontal polarization signals, vertical polarization signal and multiple correlation operation signal, until at such identification
The number continuously performed is managed greater than until second threshold.
16. pattern recognition device according to claim 15, wherein the first threshold is 90%.
17. pattern recognition device according to claim 15, wherein the second threshold is 50.
18. pattern recognition device according to claim 15, wherein when the identifying processing continuously performs number greater than institute
When stating second threshold, check the complete polarization radiating curtain whether failure or by strong jamming.
19. a kind of image-recognizing method, comprising:
Focus millimeter wave/terahertz wave signal of the projection from checked object；
Millimeter wave/terahertz wave signal described in complete polarization obtains horizontal polarization signals, vertical polarization signal and multiple correlation fortune
Calculate signal；
Signal processor is configured as being transported according to the horizontal polarization signals, the vertical polarization signal and the multiple correlation
It calculates signal and forms blending image；
Neural network recognizer is configured as:
Study is continuously trained according to the blending image, obtains the training pattern of continuous renewal；And
Image recognition is carried out based on the training pattern；And
Image display is configured as showing identified image.
20. according to the method for claim 19, further includes:
Go out multiple figures based on the horizontal polarization signals, the vertical polarization signal and the multiple correlation operation image formation
Picture；
Determine whether described multiple images are complete images, wherein
If described multiple images are complete images, described image is fused to blending image by the signal processor；With
And
If described multiple images are not complete images, the signal processor abandons this group of image.
21. according to the method for claim 20, further includes: based on described multiple images and the blending image constantly into
Row training study.
22. according to the method for claim 17, in which:
Carrying out image recognition based on the training pattern includes:
If the matching degree of the blending image and the training pattern is greater than first threshold, then it is assumed that the blending image quilt
Identification；
If the matching degree of the blending image and the training pattern is less than or equal to first threshold, then it is assumed that the fusion
Image cannot be identified, then abandon this group of image.
23. according to the method for claim 22, in which:
It is horizontal based on next group when the matching degree of the blending image and the training pattern is less than or equal to first threshold
Polarized signal, vertical polarization signal and multiple correlation operation signal are identified, until what such identifying processing continuously performed
Until number is greater than second threshold.
24. according to the method for claim 23, wherein the first threshold is 90%.
25. according to the method for claim 23, wherein the second threshold is 50.
26. according to the method for claim 23, wherein when the number that the identifying processing continuously performs is greater than described second
When threshold value, whether breaks down or be interfered when checking millimeter wave/THz wave described in complete polarization.
27. a kind of computer program product from downloaded and/or can be recorded in the medium that can be read by computer
It is upper and/or can be executed by processor, the computer program product include for realizing according to claim 6 to 10 or 19 to
The program code instruction of method described in any one of 26.
28. a kind of non-transitory computer-readable medium, including recording the computer journey that can be run on it and by processor
Sequence product, the computer program product include for realizing according to any one of claim 6 to 10 or 19 to 26
The program code instruction of method.
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