CN106124413A - A kind of device improving THz wave compressed sensing image quality based on double image element - Google Patents
A kind of device improving THz wave compressed sensing image quality based on double image element Download PDFInfo
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Abstract
The invention discloses a kind of device improving THz wave compressed sensing image quality based on double image element, including: realizing the mask plate of transmission and reflection, first, second terahertz wave detector model is identical simultaneously；The THz wave carrying imaging object information is modulated through mask plate, and mask plate is placed in parallel in the optical path with imaging object；First, second terahertz wave detector receives the terahertz emission through mask plate transmission and reflection respectively；The most corresponding phase adduction of the radiant intensity array first, second terahertz wave detector received processes, and obtains the transmission after normalization and reflected radiation array；Intensity in transmission array after normalization is corresponding with reflex strength array subtracts each other and processes, and be inhibited the output pulsation test data with external interference；Test data input compressed sensing recovery routine i.e. can obtain reconstructing image.The present invention the most at utmost reduces external condition impact in the sample phase of Terahertz compressed sensing imaging, improves image quality.
Description
Technical field
The present invention relates to THz wave field of detecting, particularly relate to a kind of raising THz wave compression sense based on double image element
Know the device of image quality.
Background technology
(Terahertz is called for short THz, 1THz=10 to Terahertz12Hz) radiation refer to frequency from 0.1THz to 10THz, accordingly
Wavelength from 3 millimeters to 30 microns, the electromagnetic spectrum region that spectral range is comparatively wide between millimeter wave and infrared light.Terahertz
Hereby radiating specific position residing in electromagnetic spectrum and impart its a series of special character, this makes Terahertz Technology permissible
It is applied to the directions such as biomedical detection, substance characteristics research, safety check.THz wave correlation technique achieved past 20 years
Very fast development, wherein THz wave imaging achieves a series of achievement especially as one of its study hotspot.Along with THz wave
The continuous maturation of imaging technique, point by point scanning formula and the speed of array imaging, sensitivity and spatial resolution gradually promote.So
And the slow problem the most relatively low with array image sensitivity of point by point scanning formula image taking speed is the most preferably solved, terahertz
Hereby imaging field is to quickly and have highly sensitive formation method and have urgent demand.
Compressed sensing is that one makes full use of the openness or compressible brand-new signals collecting of signal, encoding and decoding theory,
The sampling of signal can be realized under sample rate is much smaller than Shannon-nyquist sampling theorem.2006, Rice Univ USA ground
Having made first item imaging based on compressed sensing model machine, be referred to as " single pixel camera ", it only utilizes a detector with regard to energy
Enough realize the collection of two dimensional image signal.THz wave imaging based on compressed sensing is a kind of can be before ensureing sensitivity
Put and effectively reduce sample rate, improve the novel THz imaging technology of image taking speed.Common compressed sensing imaging process is
To cover imaging object after THz wave homogenization, the THz wave through imaging object carries object information, then Terahertz
Radiating and modulated by the mask matrix on mask plate, detector receives the intensity after modulation or phase information.
In order to obtain imaging object global information accurately, terahertz emission is needed to cover imaging object uniformly, but
The general Gaussian distributed of terahertz emission.The homogenization device of terahertz wave band is deficient, although expands and can cause radiation profiles
Relatively uniform, but still cannot preferably meet the requirement of radiation homogenization.If with terahertz emission imaging pockety,
This is equivalent to the addition of a radiation profiles matrix on imaging object, and Gauss distribution is difficult to sparse, so imaging knot
Fruit will not be simple imaging object and the superposing of radiation profiles, but there will be the error even mistake of reconstruction.
Additionally, the stability in the terahertz emission source of present stage need to improve further, it is difficult to meet long-time measurement
Requirement, and the undulatory property in terahertz emission source and Terahertz heat-sensitive eye be affected by the external environment produce temperature drift
Moving, the probability that imaging results can be caused to produce error increases severely or directly produces bigger error.
Currently, by improve recovery algorithms from incomplete or by the sampled signal of sound pollution recover the side of original signal
Method, also achieves certain effect, but this approach preferably can only recover with certain probability interference is little under certain condition
Go out signal.So present stage urgent need is a kind of just can eliminate or reduce noise and the side of other impact in the signal sampling stage
Method.
Summary of the invention
The invention provides a kind of device improving THz wave compressed sensing image quality based on double image element, the present invention
Overcoming the deficiency of the existing method of sampling, the sample phase in THz wave compressed sensing imaging the most at utmost reduces extraneous bar
Part affects, and improves image quality, described below:
A kind of device improving THz wave compressed sensing image quality based on double image element, described device includes: terahertz
Hereby ripple condenser lens, described device also includes:
Realize transmission and the mask plate of reflection, the first terahertz wave detector and the second terahertz wave detector simultaneously,
The model of described first terahertz wave detector and described second terahertz wave detector is identical, described Terahertz
Ripple condenser lens is arranged between described mask plate and described first terahertz wave detector；
Carry the THz wave of imaging object information and modulate through described mask plate and by described mask plate, described in cover
Template is placed in parallel in the optical path with imaging object；
Described first terahertz wave detector and described second terahertz wave detector receive respectively through described mask
Plate transmission and the terahertz emission of reflection；
Radiant intensity array that described first terahertz wave detector is received, visit with described second THz wave respectively
Survey the radiant intensity array correspondence phase adduction process that device receives, obtain the transmission after normalization and reflected radiation array；
Intensity in transmission array after normalization is corresponding with reflex strength array subtracts each other and processes, be inhibited output pulsation with
The test data of external interference；
I.e. can obtain reconstructing image by test data input compressed sensing recovery routine.
The technical scheme that the present invention provides provides the benefit that:
1, transmission and the terahertz emission of reflection after two-way detector receives modulation respectively, compared to single channel detector, etc.
It is same as improve modulation depth, it is possible to increase Signal-to-Noise, improves the quality recovering image；
2, use two same model detectors to carry out the collection of transmission and reflected radiation simultaneously, radiation can be effectively reduced
The impact on imaging data of the undulatory property in source, improves the accuracy that image recovers；
3, radiant intensity transmission received is subtracted each other with the radiant intensity that reflection detects, it is possible to reduce between neighbor
Uneven and the impact of other external disturbance (such as temperature, vibration etc.) of radiation profiles, improves the quality recovering image.
4, the present invention uses two-way detector to gather the transmission in THz wave compressed sensing imaging and reflected radiation simultaneously,
There is the advantage that device is simple, data process simply, noise suppression effect is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device improving THz wave compressed sensing image quality based on double image element；
Fig. 2 is imaging object figure (a) and contrast effect figure (b and c).
In accompanying drawing, what each parts represented is listed as follows:
1: the mask plate of transmission and reflection can be realized simultaneously；2: THz wave condenser lens；
3: the first terahertz wave detector；4: the second terahertz wave detector.
Wherein, the model of first terahertz wave detector the 3, second terahertz wave detector 4 is identical.
Mask plate 1 part B of getting the bid represents that THz wave can pass through, and the radiation of transmission is converged by THz wave condenser lens 2
Gather the first terahertz wave detector 4；
Mask plate 1 part A of getting the bid represents anti-to Terahertz wave height (polishing or surface gold-plating process), the Terahertz spoke of reflection
Penetrate and received by the second terahertz wave detector 4.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is made further
Ground describes in detail.
Embodiment 1
See Fig. 1, a kind of device improving THz wave compressed sensing image quality based on double image element, including: permissible
Realize the mask plate 1 of transmission and reflection, THz wave condenser lens the 2, first terahertz wave detector 3 and the second terahertz simultaneously
Hereby wave detector 4.
Wherein, the model of the first terahertz wave detector 3 and the second terahertz wave detector 4 is identical, and THz wave gathers
Focus lens 2 is arranged between mask plate 1 and the first terahertz wave detector 3.
When implementing, THz source produces THz wave output, THz wave incident imaging object at an angle
1, the THz wave carrying imaging object information is modulated through mask plate 1 masked plate 1, and mask plate 1 and imaging object exist
Light path is placed in parallel.
First terahertz wave detector 3 and the second terahertz wave detector 4 receive through mask plate 1 transmission respectively with anti-
The terahertz emission penetrated, the radiation the first terahertz wave detector 3 and the second terahertz wave detector 4 collected respectively is strong
Degree summation, just can eliminate the fluctuation influence on RT of radiation source to its normalization.
The radiant intensity correspondence that first terahertz wave detector 3 and the second terahertz wave detector 4 receive is subtracted each other,
Can reduce the uneven impact caused of radiation intensity distribution, simultaneously can largely Removing Random No and background noise.
Wherein, mask plate 1 can realize transmission and the reflection of THz wave simultaneously.On metal mask plate 1, the part of hollow out can
To realize the transmission of THz wave, non-openwork part is polished or gold-plated process, increases the reflectance to THz wave.Total
The radiant intensity of transmission and reflection substantially convergence 1:1.
Radiant intensity array that first terahertz wave detector 3 of final transmission end is received, respectively with reflection end
The radiant intensity array correspondence that two terahertz wave detector 4 receive is added one by one, and being added the array obtained is different time
Through the radiation overall strength of imaging object, in the case of output not fluctuation, in this array, each element all should be equal.Existing
Its element is all taken advantage of a coefficient make it the most equal, i.e. obtains normalized overall strength, then obtain the transmission after normalization and
Reflected radiation array, has i.e. obtained the measurement data after eliminating radiation source output pulsation.
Intensity in transmission array after normalization is corresponding with reflex strength array subtracts each other, can reduce radiation profiles uneven and
The impact of outside noise.Then will make the array input recovery algorithms that difference obtains, the output pulsation that can be inhibited is done with the external world
The recovery image disturbed.
Wherein, intensity in transmission array mentioned above addition corresponding with reflex strength array, intensity in transmission array and reflection
Intensity array correspondence is subtracted each other, normalized step and recovery algorithms are all known to one of skill in the art, and the present invention implements
The part relating to software is not made any improvement by example, has simply directly used those softwares.
In sum, the dress improving Terahertz compressed sensing image quality based on double image element that the embodiment of the present invention provides
Put, it is possible to reduce the external environment condition impact on Terahertz compressed sensing imaging results in sample phase, be effectively improved image quality.
Embodiment 2
Below in conjunction with Fig. 1, the scheme in embodiment 1, operation principle are introduced further, described below:
The purpose of the embodiment of the present invention is to provide a kind of undulatory property and noise reducing radiation source in data acquisition phase
Device to THz wave compressed sensing Imaging.
THz source produces THz wave output, and THz wave, after imaging object, carries imaging object information
THz wave is modulated through mask plate 1 (can realize transmission and reflection) masked plate 1 simultaneously, and mask plate 1 is with certain angle
Degree (30 °～75 °) is placed on THz wave path, and the concrete angle of inclination of mask plate 1 is determined by the size of imaging object, and
Mask plate 1 is placed in parallel in the optical path with imaging object.
First terahertz wave detector the 3, second terahertz wave detector 4 of two same model receives respectively through mask
Plate 1 transmission (through THz wave condenser lens 2) and the terahertz emission intensity of reflection, change mask matrix, obtain different
Modulate and receive the terahertz emission intensity of correspondence.
Wherein, the theoretical model (known to one of skill in the art) of compressed sensing imaging is: Y=AX, A are mask square
Battle array, X is imaging object, and the unstability of radiation source shows as U, and noise is N.The measured value Y ' obtained during actual experiment=
UAX+N.The impact on measuring of the unstability of radiation source is of overall importance, is equivalent to take advantage of a coefficient before mask matrix A.
The noise that external environment produces acts directly on and simply allows the output intensity of detector create fluctuation on detector.If ignoring this
The impact of a little factors, directly by A-1Y ' goes to recover X, it is clear that obtain is inaccurate X.
According to two same model detectors acquisition of transmission and the terahertz emission of reflection respectively, the first of transmission end is too
The radiation Y that Hertz wave detector 3 collects1=U1AX+N1, the radiation that reflection end the second terahertz wave detector 4 detects is
Y2=U2AX+N2, N1And N2For noise jamming.
In mask matrix transmissive part (B) and can not transmissive portion (A) and must be the size of matrix, so transmission
The spoke that the radiant intensity that first terahertz wave detector 3 of end detects detects with reflection end the second terahertz wave detector 4
The summation penetrating intensity is the radiation amount through imaging object.
If radiation source output is stable, then transmission end and the radiant intensity of reflection end and always a definite value.Array Y1And Y2Ask
With obtain (Y1+Y2), seek normalization coefficient α, make α (Y1+Y2) it is a steady state value, the most i.e. eliminate the undulatory property of radiation source
Impact on measurement data.
Because the model of first terahertz wave detector the 3, second terahertz wave detector 4 is identical, and is in identical survey
In amount environment, so the size that affects that it is produced by external interference is equal, N1=N2.By the Y after normalization1And Y2Differ from,
The noise impact on measuring can be eliminated.
In sum, the dress improving Terahertz compressed sensing image quality based on double image element that the embodiment of the present invention provides
Putting, overcome the deficiency of existing sampling, the sample phase in Terahertz compressed sensing imaging the most at utmost reduces external condition
Impact, improves image quality.
Embodiment 3
Below in conjunction with Fig. 2, the device in embodiment 1 and 2 is carried out feasibility checking, described below:
This experimental simulation recovery image of obtaining at next road detector of noise situations, mentions with the embodiment of the present invention
The terahertz emission of detection transmission and reflection recovers the image obtained simultaneously, as shown in Figure 2.
Wherein, figure a is imaging object, the letter " H " of specially 20 × 20.Figure b shows under the random noise of 2%,
Zhi Yong mono-road detector acquisition of transmission radiates the image then recovered, its Y-PSNR (peak signal to noise
Ratio, PSNR) it is 5.95, image cannot identification.Figure c is shown that under the random noise of 2%, with two-way detector (first
Terahertz wave detector the 3, second terahertz wave detector 4) image that then recovers of the radiation of acquisition of transmission and reflection respectively,
Its PSNR is 23.1.It can be seen that image overall contrast is significantly increased, edge svelteness.First terahertz wave detector
3, the result that the second terahertz wave detector 4 obtains is not only the simple superposition of two restoration results, but goes up largely
Inhibit noise, farthest remain the information of imaging object.
By above-mentioned test, can directly verify the feasibility of device in the embodiment of the present invention 1 and 2, meet reality
Multiple needs in application, improve image quality.
The embodiment of the present invention is to the model of each device in addition to doing specified otherwise, and the model of other devices does not limits,
As long as the device of above-mentioned functions can be completed.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment
Sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (1)
1. the device improving THz wave compressed sensing image quality based on double image element, it is characterised in that described device
Including: THz wave condenser lens, it is characterised in that described device also includes:
Realize transmission and the mask plate of reflection, the first terahertz wave detector and the second terahertz wave detector simultaneously.
The model of described first terahertz wave detector and described second terahertz wave detector is identical, and described THz wave gathers
Focus lens is arranged between described mask plate and described first terahertz wave detector；
Carry the THz wave of imaging object information and modulate through described mask plate and by described mask plate, described mask plate
It is placed in parallel in the optical path with imaging object；
Described first terahertz wave detector and described second terahertz wave detector receive through described mask plate saturating respectively
The terahertz emission penetrated and reflect；
Radiant intensity array that described first terahertz wave detector is received, respectively with described second terahertz wave detector
The radiant intensity array correspondence phase adduction received processes, and obtains the transmission after normalization and reflected radiation array；
Intensity in transmission array after normalization is corresponding with reflex strength array subtracts each other and processes, and the output pulsation that is inhibited is with extraneous
The test data of interference
I.e. can obtain reconstructing image by test data input compressed sensing recovery routine.
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| CN106840109A (en) * | 2017-01-20 | 2017-06-13 | 长沙全度影像科技有限公司 | A kind of single pixel imaging hardware system based on difference |
| CN107831144A (en) * | 2017-10-20 | 2018-03-23 | 上海理工大学 | Optical filter transmitance detection method based on the imaging of compressed sensing association in time |
| CN107831144B (en) * | 2017-10-20 | 2020-02-21 | 上海理工大学 | Optical filter transmittance detection method based on compressed sensing time correlation imaging |
| CN111971548A (en) * | 2018-02-07 | 2020-11-20 | 蒂希韦 | Terahertz reflection imaging system |
| CN111971548B (en) * | 2018-02-07 | 2023-12-22 | 蒂希韦 | Terahertz reflection imaging system |
| CN108267418A (en) * | 2018-03-30 | 2018-07-10 | 北京农业信息技术研究中心 | Interior Seed form acquisition methods and device based on terahertz tomographic technology |
| CN108267418B (en) * | 2018-03-30 | 2023-12-05 | 北京农业信息技术研究中心 | Terahertz chromatography technology-based seed internal morphology acquisition method and device |
| CN110213467A (en) * | 2019-05-27 | 2019-09-06 | 中国科学院国家空间科学中心 | The multiple dimensioned modulation compressed sensing imaging system of one kind and its imaging method |
| CN110213467B (en) * | 2019-05-27 | 2020-10-23 | 中国科学院国家空间科学中心 | Multi-scale modulation compressed sensing imaging system and imaging method thereof |
| CN111510578B (en) * | 2020-03-31 | 2021-07-09 | 天津大学 | JPEG compressed image reconstruction method based on reinforcement learning |
| CN111510578A (en) * | 2020-03-31 | 2020-08-07 | 天津大学 | JPEG compressed image reconstruction method based on reinforcement learning |
| CN111579521B (en) * | 2020-05-06 | 2021-10-15 | 中国科学院沈阳自动化研究所 | Terahertz compression imaging optimization method and system based on data selection |
| CN111579521A (en) * | 2020-05-06 | 2020-08-25 | 中国科学院沈阳自动化研究所 | Terahertz compression imaging optimization method and system based on data selection |
| CN111812672A (en) * | 2020-07-31 | 2020-10-23 | 广东工业大学 | Image reconstruction method and reflective terahertz ghost imaging system |
| CN111812672B (en) * | 2020-07-31 | 2023-02-10 | 广东工业大学 | Image reconstruction method and reflective terahertz ghost imaging system |
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