CN111551955B - Bionic blocking ghost imaging method and system - Google Patents
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Abstract
The invention discloses a bionic blocking ghost imaging method and system, and belongs to the technical field of photoelectric imaging. The system comprises a light source, a collimation optical system, a light splitter, a spatial light modulator, a receiving optical system and an area array detector. The implementation method of the invention comprises the following steps: initializing parameters for generating bionic speckles and parameters for ghost imaging sampling; obtaining higher imaging quality through bionic speckle sampling; by partitioning the bionic speckles, the sampling times of ghost imaging can be reduced by adopting the bionic speckles with lower resolution; sampling a target by adopting block bionic speckles to obtain a measured value of each block; performing image reconstruction according to the block bionic speckles and the measured value; and splicing the reconstructed block images to obtain the whole reconstructed image, namely realizing the bionic block ghost imaging which takes both the imaging efficiency and the imaging quality into account. The invention combines the bionic speckle with the block ghost imaging, and effectively improves the ghost imaging efficiency under the condition of the same imaging quality compared with the traditional ghost imaging system.
Description
Technical Field
The invention relates to a bionic blocking ghost imaging method and a system, and belongs to the technical field of photoelectric imaging.
Background
Compared with the traditional optical imaging system, the ghost imaging is the biggest difference in that image reconstruction is performed by correlating light field intensity distribution information of a light source and total light intensity information of the light field after target modulation. The ghost imaging technology has the advantages of simple structure, strong anti-interference capability, imaging resolution exceeding diffraction limit and the like at present, and has been widely applied to the fields of two-dimensional and three-dimensional imaging, remote sensing, microscopic imaging and the like. The imaging efficiency of ghost imaging to realize high-quality imaging is not high, and although the imaging efficiency can be improved by reducing the sampling times, the imaging quality is reduced. It is still a challenge to compromise imaging efficiency and imaging quality.
A single-point detector or a barrel detector is adopted in a traditional ghost imaging system, each projection speckle corresponds to only one measured value, the bandwidth of data transmission is not fully occupied, and the real-time performance of the imaging system is limited to a great extent. By adopting the scheme of block parallel transmission, more data information can be obtained in the same time, so that the imaging efficiency of the imaging system is improved. In addition, with the development of the bionic technology, the imaging quality can be improved by applying the bionic projection speckle based on high-resolution at the center and low-resolution at the edge to ghost imaging. In view of the above, by utilizing the characteristics of the two, a bionic blocking ghost imaging method is provided and an imaging system is designed, so that a brand new technical approach is provided for real-time ghost imaging with high imaging quality and high resolution.
Disclosure of Invention
In order to solve the problem that the imaging efficiency and the imaging quality are difficult to be considered in the conventional ghost imaging method, the invention aims to provide a bionic blocking ghost imaging method and system, which can consider both the imaging efficiency and the imaging quality.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a bionic blocking ghost imaging method and a system, which initialize parameters for generating bionic speckles and parameters for ghost imaging sampling; generating a group of bionic speckles according to the set bionic speckle parameters, and obtaining higher imaging quality through bionic speckle sampling; by partitioning the bionic speckles, the sampling times of ghost imaging can be reduced by adopting the bionic speckles with lower resolution; sampling the target by adopting block bionic speckles to obtain a measured value of each block; performing image reconstruction according to the block bionic speckles and the measured value; and splicing the reconstructed block images to obtain the whole reconstructed image, namely realizing the bionic block ghost imaging which takes both the imaging efficiency and the imaging quality into account. The invention combines the bionic speckle and the block ghost imaging, and effectively improves the imaging efficiency of the ghost imaging system under the condition of the same imaging quality compared with the traditional ghost imaging system.
The invention discloses a bionic blocking ghost imaging method, which comprises the following steps:
initializing parameters for generating bionic speckles and parameters for ghost imaging sampling.
Step 1.1: initializing the parameters for generating the bionic speckles.
Setting the image resolution X, the block number N, the maximum value Q of the bionic speckle discrete angle, the maximum value K of the bionic speckle discrete ring number and the inner ring radius r of the bionic speckle0. The number N of the blocks is a square number.
Step 1.2: and initializing ghost imaging sampling parameters.
Setting the sampling ratio as a, the sampling times as A ═ X multiplied by a/N, and rounding A to get the integer.
And step two, generating a group of bionic speckles according to the bionic speckle parameters set in the step one, and obtaining higher imaging quality through sampling of the bionic speckles.
And C, generating A bionic speckles P according to the bionic speckle parameters set in the step I, wherein the bionic speckle calculation formula is shown as the formula (1).
Wherein: r iskRepresents the radius of the kth ring of speckle, (1+ sin (π/Q))/(1-sin (π/Q)) represents the augmentation factor ε, θqIs the degree of the q sector. The bionic speckle P is an image with a resolution of X × X.
And thirdly, partitioning the bionic speckles, and adopting speckles with lower resolution to reduce the sampling times of ghost imaging.
Performing N equal division on the bionic speckle P to obtain P1、p2、…、pNEach of piIs composed of
Of the matrix of (a). Here, the numbers are split and numbered in a way of first-row-after-column or first-row-after-row, wherein p1Speckle No. 1, pNSpeckle No. N.
After splitting A bionic speckles, pi＝{pi1,pi2,...,piA}(i＝1,2,…,N)。
And step four, sampling the target by adopting the block bionic speckles in the step three to obtain a measured value of each block.
The bionic speckles are projected to an object O to be imaged for sampling, and the object O and the bionic speckles are distinguished as O in the same way1、o2、…oN。
The light source is projected on the object O to be imaged, and the detector obtains the measured value y according to the formula (3)1、y2、…yN，yiIs the measured value of block sampling A times corresponding to the number i, yi＝{yi1,yi2,...,yiA}(i＝1,2,…,N)。
yi＝∫∫pi(x,y)×oi(x,y)dxdy,(i＝1,2...,N) (3)
And fifthly, reconstructing the image according to the blocked bionic speckles in the third step and the measured values in the fourth step.
piAnd yiCalculating the speckle with the number i and the measured value with the corresponding number by adopting a reconstruction algorithm to obtain a reconstructed image oi' the calculation formula is shown as formula (4) < o >i' is at a resolution of
And (4) an image.
And step six, splicing the reconstructed block images obtained in the step five to obtain the whole reconstructed image, namely realizing the bionic block ghost imaging which takes both the imaging efficiency and the imaging quality into consideration.
According to the mode of selecting and splitting speckles in the third step, the method is implementedi' image stitching is performed to obtain the whole reconstructed image O ', and O ' is an image with the resolution of X multiplied by X. The speckle splitting mode is first row and second row or first row and second row.
The invention also discloses a bionic block ghost imaging system which is used for realizing the bionic block ghost imaging method and comprises a light source, a collimation optical system, a beam splitter, a spatial light modulator, a receiving optical system and an area array detector.
The light source, the collimating optical system, the beam splitter and the spatial light modulator are sequentially positioned on the same light path; the light source, the collimating optical system and the beam splitter are used for generating area array light irradiating the spatial light modulator; the light source, the collimating optical system, the beam splitter and the spatial light modulator are used for generating speckles carrying known light field distribution information and projecting the speckles onto a target to be imaged; and the receiving optical system and the area array detector finish the collection of the total light intensity of the target reflected light. And the correlation arithmetic unit carries out reconstruction operation and block image splicing operation on the bionic speckle information and the information acquired by the area array detector.
The invention also discloses a working method of the bionic blocking ghost imaging system, which comprises the following steps: and (3) the light source emits a beam of light, the beam is split by the collimating optical system and the beam splitter and then is irradiated to the surface of the spatial light modulator, the spatial light modulator reflects the beam to a target according to the bionic speckle reflected beam generated by the calculation in the step two, the target reflected beam passes through the receiving optical system according to the step four and then reaches the area array detector, and the total light intensity of the target reflected light is received by the area array detector. After repeated measurement, cross-correlation operation is carried out on the bionic speckle information and the light intensity information collected by the area array detector according to the fifth step to obtain a reconstructed image of the target block, and the block images reconstructed according to the sixth step are spliced to obtain a whole reconstructed image, namely the bionic block ghost imaging which gives consideration to both imaging efficiency and imaging quality is realized.
Has the advantages that:
1. compared with the traditional ghost imaging system, the bionic blocking ghost imaging method and system disclosed by the invention have the advantages that the bionic visual mechanism is combined with the blocking ghost imaging method, the imaging efficiency is greatly improved under the condition of the same imaging quality, and the high-quality real-time imaging can be realized.
2. The invention discloses a bionic block ghost imaging method and a bionic block ghost imaging system.
Drawings
FIG. 1 is a schematic diagram of a biomimetic blocked ghost imaging system;
fig. 2 bionic speckle pattern (resolution 64 x 64);
FIG. 3 is a flow chart of a bionic block ghost imaging method;
FIG. 4 is a reconstructed image comparison (using a total variation reconstruction algorithm) of the bionic block ghost imaging and the traditional ghost imaging under the same sampling times;
fig. 5 shows the reconstruction efficiency comparison of the bionic block-ghost imaging with the conventional ghost imaging under the same PSNR (conventional ghost imaging time/bionic block-ghost imaging time).
Wherein: 1-an upper computer, 2-a light source, 3-a collimation optical system, 4-a diffraction optical element, 5-a spatial light modulator, 6-a target, 7-a receiving optical system, 8-an area array detector and 9-a collection card.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
In the bionic blocking ghost imaging method disclosed in this embodiment, an applied system structure is shown in fig. 1, and the specific implementation steps are as follows:
initializing parameters for generating bionic speckles and parameters for ghost imaging sampling. Initializing parameters for generating the bionic speckles, and setting an image resolution of 64 multiplied by 64, a block number of 16, a maximum value of a bionic speckle discrete angle of 24, a maximum value of a bionic speckle discrete ring number of 4 and a bionic speckle inner ring radius of 19.7; and initializing ghost imaging sampling parameters, wherein the sampling ratio is 0.1, and the sampling times are 26.
And step two, generating a group of bionic speckles according to the bionic speckle parameters set in the step one, and obtaining higher imaging quality through sampling of the bionic speckles.
And (4) generating 26 bionic speckle patterns P according to the bionic speckle parameters set in the step one, and loading the patterns P to a Digital Micromirror Device (DMD), wherein the bionic speckle calculation formula is shown as a formula (6).
Wherein: r iskRepresents the radius of the kth ring of speckle, (1+ sin (π/Q))/(1-sin (π/Q)) represents the augmentation factor ε, θqIs the degree of the q sector. The bionic speckle P is an image with a resolution of 64 × 64, as shown in fig. 2.
And thirdly, partitioning the bionic speckles, and adopting speckles with lower resolution to reduce the sampling times of ghost imaging.
Performing 16 equal divisions on the bionic speckle P to obtain P1、p2、…、p16Each of piIs a 16 x 16 matrix.
After splitting 26 bionic speckles, pi＝{pi1,pi2,…,pi26}(i＝1,2,…,16)。
And step four, sampling the target 6 by adopting the block bionic speckles in the step three to obtain a measured value of each block.
The light source 2 is collimated and split by a collimating lens and a DOE (diffractive optical element 4), the split light is projected to a DMD micro mirror surface to be modulated, and the modulated light is irradiated to a target 6O to be imaged to be sampled.
The array light irradiates on the object 6O to be imaged, and the CCD detector obtains a detection value y according to the formula (8)1、y2、…y16，yiIs the measured value y of the block sample number i corresponding to 26 timesi＝{yi1,yi2,…,yi26}(i＝1,2,…,16)。
yi＝∫∫pi(x,y)×oi(x,y)dxdy,(i＝1,2...,16) (8)
And fifthly, reconstructing the image according to the blocked bionic speckles in the third step and the measured values in the fourth step.
piAnd yiCalculating the speckle with the number i and the measured value with the corresponding number by adopting a TV (total variation) reconstruction algorithm to obtain a reconstructed image oi'，oi' is an image with a resolution of 16 × 16.
And step six, splicing the reconstructed block images obtained in the step five to obtain a whole reconstructed image, namely realizing the bionic block ghost imaging which takes both the imaging efficiency and the imaging quality into consideration.
According to the mode of selecting and splitting speckles in the third step, the method is implementedi' performing image stitching to obtain the whole reconstructed image O ', O ' is an image with the resolution of 64 × 64. The speckle splitting mode is first row and second row or first row and second row. The resulting reconstructed image O' is shown in fig. 4.
The system comprises a laser light source 2, a collimating optical system 3, a DOE, a DMD, a receiving optical system 7 and a CCD detector.
The laser light source 2, the collimating optical system 3, the DOE and the DMD are sequentially positioned on the same light path; the laser light source 2, the collimating optical system 3 and the DOE are used for generating area array light irradiating the DMD; the laser light source 2, the collimating optical system 3, the DOE and the DMD are used for generating speckles carrying known light field distribution information and projecting the speckles onto a target 6 to be imaged; the receiving optical system 7 and the CCD detector complete the collection of the total light intensity of the reflected light of the target 6. The computer carries out reconstruction operation and block image splicing operation on the bionic speckle information and the information acquired by the array detector 8.
The working method of the bionic blocking ghost imaging system disclosed by the embodiment comprises the following steps: the light source 2 emits a beam of light, the beam of light is split by the collimating optical system 3 and the beam splitter and then is irradiated to the surface of the spatial light modulator 5, the spatial light modulator 5 reflects the beam to the target 6 according to the bionic speckle reflected beam generated by the calculation in the step two, the reflected beam of the target 6 passes through the receiving optical system 7 to the area array detector 8 according to the step four, and the total light intensity of the reflected light of the target 6 is received by the area array detector 8. After repeated measurement, cross-correlation operation is carried out on the bionic speckle information and the light intensity information collected by the area array detector 8 according to the fifth step to obtain a reconstructed image of the target 6 blocks, and the block images reconstructed according to the sixth step are spliced to obtain a whole reconstructed image, namely the bionic blocked ghost imaging which gives consideration to both imaging efficiency and imaging quality is realized.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. A bionic blocking ghost imaging method is characterized in that: comprises the following steps of (a) carrying out,
initializing parameters for generating bionic speckles and parameters for ghost imaging sampling;
step two, generating a group of bionic speckles according to the bionic speckle parameters set in the step one, and obtaining higher imaging quality through bionic speckle sampling;
thirdly, partitioning the bionic speckles, and adopting speckles with lower resolution to reduce the sampling times of ghost imaging;
step four, sampling the target by adopting the block bionic speckles in the step three to obtain a measured value of each block;
fifthly, image reconstruction is carried out according to the blocked bionic speckles in the third step and the measured values in the fourth step;
step six, splicing the reconstructed block images obtained in the step five to obtain a whole reconstructed image, namely realizing the bionic block ghost imaging which takes both the imaging efficiency and the imaging quality into consideration;
the first implementation method comprises the following steps of,
step 1.1: initializing parameters for generating bionic speckles;
setting the image resolution X, the block number N, the maximum value Q of the bionic speckle discrete angle, the maximum value K of the bionic speckle discrete ring number and the inner ring radius r of the bionic speckle0(ii) a The number N of the blocks is a square number;
step 1.2: initializing ghost imaging sampling parameters;
setting a sampling ratio as a, wherein the sampling times are A ═ X × X × a/N, and A is rounded up and rounded;
the second step is realized by the method that,
generating A pieces of bionic speckles P according to the bionic speckle parameters set in the first step, wherein a bionic speckle calculation formula is shown in the formula;
wherein: r iskRepresents the radius of the kth ring of speckle, (1+ sin (π/Q))/(1-sin (π/Q)) represents the augmentation factor ε, θqIs the degree of the q sector; the bionic speckle P is an image with the resolution of X multiplied by X;
the third step is realized by the method that,
performing N equal division on the bionic speckle P to obtain P1、p2、…、pNEach of piIs composed of
A matrix of (a); here, the numbers are split and numbered in a way of first-row-after-column or first-row-after-row, wherein p1Speckle No. 1, pNSpeckle No. N;
after A bionic speckles are separated, pi＝{pi1,pi2,...,piA}(i＝1,2,…,N)；
The implementation method of the fourth step is that,
projecting the bionic speckle to an object O to be imaged for samplingO is distinguished from bionic speckle as O in the same way1、o2、…oN；
The light source is projected on an object O to be imaged, and the detector obtains a measured value y according to the formula1、y2、…yN，yiIs the measured value of block sampling A times corresponding to the number i, yi＝{yi1,yi2,...,yiA}(i＝1,2,…,N)；
yi＝∫∫pi(x,y)×oi(x,y)dxdy,(i＝1,2...,N) (3)
The fifth step is to realize that the method is that,
piand yiCalculating the speckle with the number i and the measured value with the corresponding number by adopting a reconstruction algorithm to obtain a reconstructed image oi', the calculation formula is shown as the formula, oi' is at a resolution of
An image;
the sixth implementation method comprises the following steps of,
according to the mode of selecting and splitting speckles in the third step, the method is implementediCarrying out image splicing to obtain a whole reconstructed image O ', wherein O' is an image with the resolution of X multiplied by X; the speckle splitting mode is first row and second row or first row and second row;
2. a bionic block ghost imaging system for implementing a bionic block ghost imaging method according to claim 1, characterized in that: the device comprises a light source (2), a collimation optical system (3), a light splitter, a spatial light modulator (5), a receiving optical system (7) and an area array detector (8);
the light source (2), the collimating optical system (3), the light splitter and the spatial light modulator (5) are sequentially positioned on the same light path; the light source (2), the collimating optical system (3) and the beam splitter are used for generating area array light irradiating the spatial light modulator (5); the light source (2), the collimating optical system (3), the beam splitter and the spatial light modulator (5) are used for generating speckles carrying known light field distribution information and projecting the speckles onto a target (6) to be imaged; the receiving optical system (7) and the area array detector (8) finish the collection of the total light intensity of the reflected light of the target (6); the correlation arithmetic unit carries out reconstruction operation and block image splicing operation on the bionic speckle information and the information collected by the area array detector (8);
the light source (2) emits a beam of light, the beam of light is split by the collimating optical system (3) and the beam splitter and then is irradiated to the surface of the spatial light modulator (5), the spatial light modulator (5) reflects the beam to the target (6) according to the bionic speckle reflected beam generated in the second step, the reflected beam of the target (6) passes through the receiving optical system (7) to the area array detector (8) according to the fourth step, and the total light intensity of the reflected light of the target (6) is received by the area array detector (8); after repeated measurement, cross-correlation operation is carried out on the bionic speckle information and the light intensity information collected by the area array detector (8) according to the fifth step to obtain a reconstructed image of the target (6) blocks, and the block images reconstructed according to the sixth step are spliced to obtain a whole reconstructed image, namely the bionic blocked ghost imaging which gives consideration to both imaging efficiency and imaging quality is realized.
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