AU2021104957A4 - Large-field-of-view high-resolution terahertz wave digital holographic imaging method and system - Google Patents
Large-field-of-view high-resolution terahertz wave digital holographic imaging method and system Download PDFInfo
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- 238000011084 recovery Methods 0.000 claims description 3
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
- G03H1/0866—Digital holographic imaging, i.e. synthesizing holobjects from holograms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H2001/0208—Individual components other than the hologram
- G03H2001/0216—Optical components
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2226/00—Electro-optic or electronic components relating to digital holography
- G03H2226/11—Electro-optic recording means, e.g. CCD, pyroelectric sensors
Abstract
The present invention discloses a large-field-of-view and high-resolution Terahertz
wave coaxial digital holographic imaging method and system. The method includes a
recording process for movement and scanning of a detector, a sub-hologram synthesis
and reconstruction process, a recording process for movement and scanning of a
sample, and a sub-field-of-view image mosaic process,wherein (1) in the recording
process for movement and scanning of the detector, a detector two-dimensional
translation stage moves in a rectangular raster scanning order, so that a Terahertz
wave detector performs two-dimensional movement in a plane perpendicular to the
direction of a Terahertz wave;(2) in the sub-hologram synthesis and reconstruction
process, recorded sub-holograms are subjected to a mosaic operation, and a composite
hologram is subjected toa diffraction propagation reconstruction algorithm to obtain a
complex amplitude image; (3) in the recording process for movement and scanning of
the sample, a sample two-dimensional translation stage moves in the rectangular
raster scanning order, so that the sample performs two-dimensional movement in the
plane perpendicular to the direction of the Terahertz wave, and sample information in
a corresponding field-of-view is obtained; and (4) in the sub-field-of-view image
mosaic process, image mosaic operation is performedaccording to a movement order,
a final result, namely, a composite field-of-view complex amplitude image is
obtained.
- 14-
Recording process for movement
and scanning of a detector
Sub-hologram synthesis and
reconstruction process
Recording process for movement
and scanning of a sample
Sub-field-of-view image mosaic
process
Fig. 1
-Fig. 2
0 *0 0**-15
Fig. 2
-15-
Description
Recording process for movement and scanning of a detector
Sub-hologram synthesis and reconstruction process
Recording process for movement and scanning of a sample
Sub-field-of-view image mosaic process
Fig. 1
-Fig. 2
0*0 0**-15
Fig. 2
[0001] The present invention relates to a large-field-of-view high-resolution Terahertz wave digital holographic imaging method and system, and particularly to a
large-field-of-view high-resolution continuous Terahertz wave coaxial digital
holographic imaging method and system.
[0002] Terahertz wave is between infrared rays and microwaves in an electromagnetic spectral band, and itscharacteristics are in the transition stagebetween
the infrared rays and the microwaves, so Terahertz wave is considered to have broad
applications in the field of imaging. Terahertz DigitalHolography, which is a coherent
diffraction imaging method based on a Terahertz wave source, can effectively obtain
the amplitude and phase distribution of a target sample under the illumination of the
Terahertz wave. It can meet the requirements of non-destructive imaging detection,
and is applicable to the fields of anti-terrorism security inspection, medical diagnosis,
petroleum geological exploration, etc. According to the interference angles of the
Terahertz wave, it can be roughly divided into two imaging structures that are a
coaxialstructure and an off-axisstructure. Because the coaxial structure is relatively
simple, and has low requirement for the coherence of the Terahertz wave source and
high bandwidth utilizationof a detector, it becomes an important structure in a
Terahertz wave digital holographic imaging system.
[0003] The present invention is directed to provide a large-field-of-view
high-resolution continuous Terahertz wave coaxial digital holographic imaging
method and system, which are novel large-field-of-view high-resolution Terahertz
wave digital holographic imaging technology. The existing Terahertz wave coaxial
digital holographic imaging method has the following defectsofsmall numerical
aperture of the detector, insufficient ability to acquire high-frequency information, andgreat limitation toactual imaging resolution of the system.In order to ensure the energy of a reference light wave, the size of an object to be detected needs to be smaller than the diameter of a Terahertz light beam, which limits the types of samples to be detected, and the imaging field-of-view of the system cannot meet the specific requirements. By using the method proposed in the present invention, the field-of-view of the system can be effectively expanded, the imaging resolution can be improved, the problems of the limited field-of-view and the limited resolution in practical applications can be solved, the imaging requirements of specific samples can be met, and large-field-of-view and high-resolution Terahertz wave amplitude and phase imaging can be realized.
[0004] The invention is directed to provide a large-field-of-view
high-resolution Terahertz wave coaxial digital holographic imaging method and
system, which are used for expanding field-of-view of Terahertz wave digital
holographic imaging and improving imaging resolution.
[0005] The present invention is directed to provide a large-field-of-view
high-resolution Terahertz wave digital holographic imaging method and system, so as
to solve the problems of the existing method mentioned in the background. The
method provided in the present invention is a novel large-field-of-view
high-resolution Terahertz wave digital holographic imaging technology. The existing
Terahertz wave coaxial digital holographic imaging method has following
defectsofsmall numerical aperture of the detector, insufficient ability to acquire
high-frequency information, and great limitation toactual imaging resolution of the
system.In order to ensure the energy of a reference light wave, the size of an object to
be detected needs to be smaller than the diameter of a Terahertz light beam, which
limits the types of samples to be detected, and the imaging field-of-view of the system
cannot meet the specific requirements. By using the method proposed in the present
invention, the field-of-view of the system can be effectively expanded, the imaging
resolution can be improved, the problems of limited field-of-view and limited resolution in practical applications can be solved, the imaging requirements of specific samples can be met, and the large-field-of-viewhigh-resolution Terahertz wave amplitude and phase imaging can be realized.
[0006] According tothe large-field-of-view high-resolution Terahertz wave coaxial digital holographic imaging method provided by the present invention, a
sample two-dimensional translation stage and a detector two-dimensional translation
stage are sequentially moved according to an order shown in a rectangular raster
scanning order, wherein the purpose of moving the sample two-dimensional
translation stage is to expand the field-of-view and the purpose of moving the detector
two-dimensional translation stage is to improve the imaging resolution, and the
imaging method is characterized by comprising the following steps: a recording
process for movement and scanning of a detector, a sub-hologram synthesis and
reconstruction process, a recording process for movement and scanning of a sample,
and a sub-field-of-view image mosaic process.
[00071 (1) Recording process for movement and scanning of the
detector:placinga Terahertz wave detector on the detector two-dimensional translation
stage, which moves in the rectangular raster scanning order to allow the Terahertz
wave detector to perform two-dimensional movement in a plane perpendicular to the
direction of a Terahertz wave, wherein a transverse movement distance is set as di, the
number of movement is set as K, a longitudinal movement distance is set as d2, and
the number of movement is set as L; in a Terahertz wave coaxial digital holographic
imaging process, interfering a Terahertz object light wave modulated by the sample
and a transmitted Terahertz reference light wave to form a Terahertz sub-hologram,
recording the sub-hologram for each movement of the Terahertz wave detector,
wherein a total of K+L+1 sub-holograms are recorded; and then returning the
Terahertz wave detector to an initial position through the detector two-dimensional
translation stage.
[0008] (2) Sub-hologram synthesis reconstruction process:performinga mosaic
operation on the recorded K+L+1 sub-holograms according to a movement orderto
obtain a composite hologram H, and obtaining a reconstructed complex amplitude image R of the sample after the composite hologram H is subjected to a digital diffraction propagation reconstruction algorithm and a phase recovery reconstruction algorithm in a computer, whereinin the mosaic operation process of the sub-holograms, the number of overlapping pixels Px and Py of adjacent sub-holograms in a transverse direction and a longitudinal directionis calculated according to the following formulas:
P= (S- d)x T _ (S-d2 )xT
[0009] S S
[0010] where, S is an actual size of the Terahertz wave detectorand T is the number of pixels of the Terahertz wave detector.
[0011] (3) Recording process for movement and scanning of the
sample:placingthe sample to be detectedon a sample two-dimensional translation
stage, which moves in the rectangular raster scanning order to allow the sample to
perform the two-dimensional movement in the plane perpendicular to the direction of
the Terahertz wave;changing the illuminatedposition of the samplebythe Terahertz
wave, and obtaining sample information in a corresponding field-of-view, wherein the
transverse movement distance is set as d3 and the longitudinal movement distance is
set as d 4 ; and before each movement of the sample two-dimensional translation stage,
repeatedly performingboth of the recording process for movement and scanning of the
detector in step (1) and the sub-hologram synthesis reconstruction process in step
(2)to obtain a single sub-field-of-view reconstructed complex amplitude image R,
wherein M+1 sub-field-of-view reconstructed complex amplitude images R+1 can be
obtained by M times movement of the sample two-dimensional translation stage.
[0012] (4) Sub-field-of-view image mosaic process:performinga mosaic
operation on the M+1 sub-field-of-view reconstructed complex amplitude images
Rm+ obtained in step (3)according to the movement order to obtain a final result,
namely, a composite field-of-view complex amplitude image, whereininthe mosaic
operation process of the transverse and longitudinal sub-field-of-view images, the
number of overlapping pixels Ix and Iy of adjacent sub-field-of-view images is
calculated according to thefollowing formulas:
Kx d (KxdS-d 3 )xT _ SLd-d4 )xT
[00131 I, = L+1 S d=T (S+Lxd2 S S
[0014] According tothe method, in the recording process for movement and scanning of the detector, the values of the transverse movement distance di and the longitudinal movement distance d2need to be less than or equal to the actual size S of the Terahertz wave detector, and in the recording process for movement and scanning of the sample, the values of the transverse movement distance d3 and the longitudinal movement distance d4need to be less than or equal to the actual size S of the Terahertz wave detector.
[0015] The large-field-of-view high-resolution Terahertz wave coaxial digital holographic imaging systemprovided in the present invention is characterized byincluding: an avalanche diode Terahertz wave source 1, a Terahertz wave lens 2, a Terahertz wave lens 3, a sample two-dimensional translation stage 4, a sample 5, a detector two-dimensional translation stage 6, and a Terahertz wave pyroelectric detector 7, wherein the avalanche diode Terahertz wave source 1 is used for generating and outputting a Terahertz wave la, the Terahertz wave lens 2 and the Terahertz wave lens 3 constitute a beam expansion unit for expanding the beam diameter of the Terahertz wave while shaping the Terahertz wave into a parallel wave, the sample two-dimensional translation stage 4 is used for placingthe sample 5 and completing the two-dimensional movement in the recording process for movement and scanning of the sample, the detector two-dimensional translation stage 6 is used for placingthe Terahertz wave pyroelectric detector 7 and completing the two-dimensional movement in the recording process for movement and scanning of the detector, and the beam diameter of the Terahertz wave la which passes through the beam expansion unit formed by the Terahertz wave lens 2 and the Terahertz wave lens 3 needs to be larger than the diameter of a detection surface of the Terahertz wave pyroelectric detector 7.
[00161 Compared to the prior art, the present invention has the following beneficial effects:
[00171 the present invention discloses the large-field-of-view high-resolution Terahertz wave coaxial digital holographic imaging method and system, the Terahertz
wave high-resolution imaging is realized technically by acquiring more
high-frequency information through the detector movement translation stage,the
large-field-of-view imaging is realized by moving the sample to be detected by using
the sample two-dimensional translation stage, and the method and system havewide
practicability.
[0018] Fig. 1 is a flowchart of a large-field-of-view high-resolution Terahertz
wave coaxial digital holographic imaging method of a large-field-of-view
high-resolution Terahertz wave digital holographic imaging method and system
according to the present invention;
[0019] Fig. 2 is a schematic diagram of a rectangular raster scanning order
movement mode of a two-dimensional translation stage of a high-field-of-view
high-resolution Terahertz wave digital holographic imaging method and system
according to the present invention; and
[0020] Fig. 3 is a system schematic diagram of a large-field-of view
high-resolution Terahertz wave coaxial digital holographic imaging method of a
large-field-of-view high-resolution Terahertzwave digital holographic imaging
method and system according to the present invention.
[0021] In figures: 1. Avalanche diode Terahertz wave source; la. Terahertz
wave; 2. Terahertz wave lens; 3. Terahertz wave lens; 4. Sample two-dimensional
translation stage; 5. Sample; 6. Detector two-dimensional translation stage; and 7.
Terahertz wave pyroelectric detector.
[0022] The technical solutions in the embodiments of the invention will be
clearly and completely described below in combination with the drawings in the embodiments of the invention. It is apparent that the described embodiments are not all embodiments but only a part of embodiments of the invention.
[00231 In the description of the present invention, unless otherwise specified, "multiple" means two or more; the term "upper","lower", "left", "right", "inner", "outer", "front end", "back end", "head part", "tail part", etc. are based on the orientation or positional relationships shown in the figures, are merely to facilitate and simplify the description of the invention, and do not indicate or imply that the device or element referred to must have a particular orientation, or be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first", "second", "third", and the like are used for describing purposes only and are not to be construed as indicating or implying relative importance.
[0024] In the descriptions of the present invention, it should be noted that, unless otherwise definite specification and limitation, terms "mutually connect" and "connect" should be broadly understood. For example, the terms may refer to fixed
connection ormay also refer to detachable connection or integrated connection. The terms may refer to mechanical connection and may also refer to electrical connection. The terms may refer to direct mutual connection, or may also refer to indirect connection through intermedia. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art from the specific context.
[0025] With reference to Figs. 1-3, the present invention provides a technical solution characterized by includingthe following steps as shown in Fig. 1: a recording process for movement and scanning of a detector, a sub-hologram synthesis and reconstruction process, a recording process for movement and scanning of a sample, and a sub-field-of-view image mosaic process.
[0026] (1) Recording process for movement and scanning of a detector:a Terahertz wave detector is placedon a detector two-dimensional translation stage, which moves in a rectangular raster scanning order to allow the Terahertz wave detector to perform two-dimensional movement in a plane perpendicular to the direction of a Terahertz wave, whereina transverse movement distance is set to be 10 mm, and the number of movement is set to be 6, a longitudinal movement distance is set to be 10 mm, and the number of movement is 2; in a Terahertz wave coaxial digital holographic imaging process, a Terahertz object light wave modulated by the sample and a transmitted Terahertz reference light wave interfere to form a Terahertz sub-hologram, the sub-hologram is recorded for each movement of the Terahertz wave detector, and a total of 9 sub-holograms are recorded; and then the Terahertz wave detector returns to an initial position through the detector two-dimensional translation stage.
[00271 (2) Sub-hologram synthesis reconstruction process: a mosaic operation is performed on the recorded 9 sub-holograms according to a movement orderto obtain a composite hologram, and a reconstructed complex amplitude image of the sampleis obtained after the composite hologramis subjected to an angular spectrum diffraction propagation reconstruction algorithm and a phase recovery reconstruction algorithm in a computer; and in the mosaic operation process of the sub-holograms, there are 35 overlapping pixels of adjacent sub-holograms which are subjected to transverse and longitudinal image mosaic operation.
[0028] (3) Recording process for movement and scanning of the sample: the sample to be detected is placedon a sample two-dimensional translation stage, and the sample two-dimensional translation stagemoves in the rectangular raster scanning order, so that the sample performs the two-dimensional movement in the plane perpendicular to the direction of the Terahertz wave, the illuminated position ofthe sample by the Terahertz wave is changed, and sample information in the corresponding field-of-view is obtained, wherein the transverse movement distance is set to be 10 mm, and the longitudinal movement distance is set to be 10 mm; and before each movement of the sample two-dimensional translation stage, both of the recording process for movement and scanning of the detector and the sub-hologram synthesis reconstruction process are repeatedly performed to obtain a single sub-field-of-view reconstructed complex amplitude image, and 9 sub-field-of-view reconstructed complex amplitude images can be obtained by 8 times of movement of the sample two-dimensional translation stage.
[0029] (4) Sub-field-of-view image mosaic process: the 9 sub-field-of-view reconstructed complex amplitude images obtained in step (3) are subjected to mosaic operationaccording to the movement order to obtain a final result, namely a composite field-of-view complex amplitude image; and inthe mosaic operation process of the transverse and longitudinal sub-field-of-view images, there are 285 overlapping pixels of adjacent sub-field-of-view images.
[0030] The optical path composition of the imaging system of the present invention is shown in Fig. 3, an avalanche diode Terahertz source is used as a light source 1, itscentral wavelength is 3 mm, frequency is 0.1 THz, and output power in an experiment is about 80 mW; Teflon Terahertz lens 2(focal length: 75 mm) and Teflon Terahertz lens 3(focal length: 151 mm) are used to adjust the diameter of a Terahertz wave; a sample two-dimension translation stage 4 (model: KSA300-11-X, working range: 300 mm) and a detector two-dimension translation stage 6 (model: KSA300-11-X, working range:300 mm) are used to move the sample to be detected and the detector respectively; and a Terahertz detector 6 is a pyroelectric detector (PY-III-HR) with a pixel size of 160 pixels and a pixel interval of 80 m, and is used to acquire a Terahertz image. By using the large-field-of-view and high-resolution Terahertz wave coaxial digital holographic imaging method and system, the large-field-of-view high-resolution amplitude and phase distribution imaging of cypress leaf samples is completed.
[0031] Experimental results of typical exemplary embodiments of the present invention show that the imaging field-of-view can be expanded and the resolution can be improved by using the method proposed in the present invention. Although the present invention has been described in detail with reference to specific embodiments, the embodiments of the invention described herein are not intended to be elaboratedor to be limited to the specificforms disclosed. Rather, the embodiments chosen to illustrate the problems are chosen to enable those skilled in the art to practice the invention. Variations and modifications may be made without departing from the substantive scope of the invention as described and defined in the following claims.
Claims (3)
1. A large-field-of-view high-resolution Terahertz wave coaxial digital
holographic imaging method, characterized by comprising the following steps: a
recording process for movement and scanning of a detector, a sub-hologram synthesis
and reconstruction process, a recording process for movement and scanning of a
sample, and a sub-field-of-view image mosaic process;
(1) recording process for movement and scanning of a detector: placing a
Terahertz wave detectoron a detector two-dimensional translation stage, which
movesin a rectangular raster scanning order to allow the Terahertz wave detector to
perform two-dimensional movement in a plane perpendicular to the direction of a
Terahertz wave, wherein a transverse movement distance is set as di, the number of
movement is set as K, a longitudinal movement distance is set as d2, and the number
of movement is set as L; in a Terahertz wave coaxial digital holographic imaging
process, interfering a Terahertz object light wave modulated by the sample and a
transmitted Terahertz reference light wave to form a Terahertz sub-hologram,
recording the sub-hologram for each movement of the Terahertz wave detector,
wherein a total of K+L+1 sub-holograms are recorded; and then returning the
Terahertz wave detectorto an initial position through the detector two-dimensional
translation stage;
(2) Sub-hologram synthesis reconstruction process:performingmosaic
operation on the recorded K+L+1 sub-holograms according to a movement order to
obtain a composite hologram, performing a digital diffraction propagation
reconstruction algorithm and a phase recovery reconstruction algorithm on the
composite hologram in a computer to obtain a reconstructed complex amplitude
image R of the sample, wherein in the mosaic operation process of the sub-holograms,
the number of overlapping pixels Px and Py of adjacent sub-holograms in a transverse
direction and a longitudinal direction is calculated according to thefollowing
formulas:
(S-d)xT (S-d2)xT Py= PX- S ' PS ' S where, S is an actual size of the Terahertz wave detector, and T is the number
of pixels of the Terahertz wave detector;
(3) recording process for movement and scanning of the sample: placing the
sample to be detectedon a sample two-dimensional translation stage, which movesin
the rectangular raster scanning order to allow the sample to perform the
two-dimensional movement in the plane perpendicular to the direction of the
Terahertz wave, changing the illuminated position of the sample by the Terahertz
wave, and obtaining sample information in a corresponding field-of-view, wherein the
transverse movement distance is set as d3, and the longitudinal movement distance is
set as d 4 ; and before each movement of the sample two-dimensional translation stage,
repeatedly performingthe recording process for movement and scanning of the
detector in step (1) and the sub-hologram synthesis reconstruction process in step (2)
to obtain a single sub-field-of-view reconstructed complex amplitude image R, and
obtaining M+1 sub-field-of-view reconstructed complex amplitude images R+1by M
times of movement of the sample two-dimensional translation stage; and
(4) sub-field-of-view image mosaic process: performinga mosaic operation on
the M+1 sub-field-of-view reconstructed complex amplitude images RM+1 obtained
in step (3)according to the movement order to obtain a final result, namely, a
composite field-of-view complex amplitude image, wherein in the mosaic operation
process of the transverse and longitudinal sub-field-of-view images, the number of
overlapping pixels Ix and Iy of adjacent sub-field-of-view images is calculated
according to thefollowing formulas: Kx d I _ L+1S T _ (S+Lxd2 -d 4 )xT S S
2. The large-field-of-view high-resolution Terahertz wave coaxial digital
holographic imaging method according to claim 1, wherein in the recording process
for movement and scanning of the detector, the values of the transverse movement distance di and the longitudinal movement distance d2need to be less than or equal to the actual size S of the Terahertz wave detector, in the recording process for movement and scanning of the sample, the values of the transverse movement distance d3 and the longitudinal movement distance d4need to be less than or equal to the actual size S of the Terahertz wave detector.
3. The large-field-of-view high-resolution Terahertz wave coaxial digital holographic imaging method according to claim 1, characterized bycomprising: an avalanche diode Terahertz wave source (1), a Terahertz wave lens (2), a Terahertz wave lens (3), a sample two-dimensional translation stage (4), a sample (5), a detector two-dimensional translation stage (6), and a Terahertz wave pyroelectric detector (7), wherein the avalanche diode Terahertz wave source (1) is used for generating and outputting a Terahertz wave (la), the Terahertz wave lens (2) and the Terahertz wave lens (3) constitute a beam expansion unit for expanding abeam diameter of the Terahertz wave (la) while shaping the Terahertz wave into a parallel wave, the sample two-dimensional translation stage (4) is used for placingthe sample (5) and completing two-dimensional movement in the recording process for movement and scanning of the sample, and the detector two-dimensional translation stage (6) is used for placingthe Terahertz wave pyroelectric detector (7) and completing the two-dimensional movement in the recording process for movement and scanning of the detector, whereinthe beam diameter of the Terahertz wave (la) which passes through the beam expansion unit formed by the Terahertz wave lens(2) and the Terahertz wave lens (3)need to be larger than the diameter of a detection surface of the Terahertz wave pyroelectric detector (7).
Recording process for movement and scanning of a detector
Sub-hologram synthesis and reconstruction process 2021104957
Recording process for movement and scanning of a sample
Sub-field-of-view image mosaic process
Fig. 1
Fig. 2
Fig. 3
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| CN115097708A (en) * | 2022-05-13 | 2022-09-23 | 四川大学 | Method for expanding holographic display resolution based on optical diffraction neural network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115097708A (en) * | 2022-05-13 | 2022-09-23 | 四川大学 | Method for expanding holographic display resolution based on optical diffraction neural network |
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