CN110864817B - Non-interference quantitative phase imaging method based on single-pixel detector - Google Patents
Non-interference quantitative phase imaging method based on single-pixel detector Download PDFInfo
- Publication number
- CN110864817B CN110864817B CN201911157438.XA CN201911157438A CN110864817B CN 110864817 B CN110864817 B CN 110864817B CN 201911157438 A CN201911157438 A CN 201911157438A CN 110864817 B CN110864817 B CN 110864817B
- Authority
- CN
- China
- Prior art keywords
- phase
- light
- modulation
- amplitude
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000005286 illumination Methods 0.000 claims abstract description 15
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 7
- 230000001427 coherent effect Effects 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 4
- 238000005305 interferometry Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 4
- 230000010363 phase shift Effects 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 210000001525 retina Anatomy 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
A non-interference quantitative phase imaging method based on a single-pixel detector comprises two processes of light field modulation detection and calculation demodulation; the light field modulation detection uses monochromatic plane light as a detection light source, and uses a pure phase type spatial light modulator to respectively carry out phase type and amplitude type aperture coding on the incident plane light; the difference operation is carried out on the obtained intensity values in the calculation and demodulation process, a series of intensity signals are obtained, the real part or the imaginary part of the object can be recovered, and the real part or the imaginary part are combined to obtain complex optical field information so as to obtain object phase information. Independent phase and amplitude modulation is performed under monochromatic illumination, the dc component of the object in the far field is measured, its correlation is detected by modulating in phase and amplitude, respectively, the phase information of the object is obtained, and a constant phase shift is determined by the object itself. The importance of the invention is that the necessity of interferometry in quantitative phase imaging is eliminated, which means that the phase imaging method requires only spatial coherence of the illumination.
Description
Technical Field
The invention relates to a non-interference quantitative phase imaging method based on a single-pixel detector, and belongs to the field of precision optical measurement.
Background
The phase of the optical field contains important information but is naturally lost during normal imaging because the photodetector, including the human retina, responds only to power and not to the phase of light. In order to reveal phase information to extend the viewing capabilities, various phase imaging techniques have been developed. In general, these techniques can be divided into two categories: phase contrast imaging and Quantitative Phase Imaging (QPI). Although phase contrast imaging shows texture with phase inhomogeneities, QPI produces a linear quantitative mapping of the phase distribution, thus allowing the observer to have a more accurate picture of the phase object.
In phase imaging techniques, interferometry is of crucial importance. As early as 1873, Abbe (Abbe) has realized the importance of interference in phase imaging, and he has described microscope images as interference effects of diffraction phenomena. Zernik, following his thought, has designed phase contrast imaging based on the inherent interference of the internal structures of the object. In earlier QPI techniques, interferometry was performed by forcing the introduction of a reference beam. Quantitative measurements of phase are then obtained by phase shift or digital holographic methods.
In recent years, attempts have been made to remove interferometric measurements from QPI by methods such as "intensity equation transfer", fourier spectroscopy. An advantage of these non-interferometric QPIs that the experimental setup is simplified due to the removal of the reference beam, which is useful when the interferometer is difficult to set up.
Computed Ghost Imaging (CGI) is a single beam approach to classical ghost imaging, also interpreted as a computational form of second order correlation measurement. The CGI scans the spatial information of an object by performing a series of designed structured illumination and non-pixilated detection. The image is obtained from the correlation of the paired illumination structures and the non-pixilated signal. The CGI is also called a single pixel camera. In a conventional CGI for amplitude objects, a bucket detector is employed for non-pixilated detection to collect the total intensity. Since the bucket detection signal is only sensitive to amplitude, the phase object cannot be imaged by amplitude detection.
Disclosure of Invention
The invention aims to provide a non-interference quantitative phase imaging method based on a single-pixel detector, which has a simple process and only needs the spatial coherence of illumination.
The invention relates to a non-interference quantitative phase imaging method based on a single-pixel detector, which comprises two processes of light field modulation detection and calculation demodulation;
the process of light field modulation detection: using monochromatic plane light as a detection light source, and respectively carrying out phase type and amplitude type aperture coding on the incident plane light by using a pure-phase spatial light modulator, wherein the coding matrixes are differential Hadamard matrixes; loading a phase type grating on a spatial light modulator, enabling planar light to deflect to meet the modulation requirement of the spatial light modulator, performing spatial filtering through a 4f system, obtaining a phase type light spot and an amplitude type light spot on a rear focal plane of the 4f system, performing aperture coding on a phase object by using the light spots, applying a Fourier lens to perform Fourier transform on the object, and obtaining zero-order frequency intensity after the structured light and the object act by using a point detector;
and calculating a demodulation process: and carrying out differential operation on the obtained zero-order frequency intensity value, wherein a differential signal is the projection of the object on a differential aperture code, when the projected aperture code is enough to form a Hilbert inner product space, a series of intensity signals are obtained to be enough to recover the real part or the imaginary part of the object, a complex amplitude real part of the phase object is obtained by using phase type aperture code modulation and demodulation, a complex amplitude imaginary part of the phase object is obtained by using amplitude type aperture code modulation and demodulation, and complex light field information is obtained by combining the real part and the imaginary part to obtain object phase information.
The light field modulation detection process specifically comprises the following steps:
(1) the He-Ne laser is used as a coherent light source, a linear polarization type laser is selected, the polarization direction of coherent light is changed by rotating the angle of the laser so as to meet the modulation requirement of a spatial light modulator, and a spatial filter is used for filtering the laser light source so as to generate a single-mode collimation plane light beam.
(2) The method comprises the steps that a phase type spatial light modulator is used for modulating a plane light beam, in order to obtain a light field mode with high modulation efficiency, a blazed grating is loaded on a light modulator (SLM) to generate diffraction, the blazed grating is designed to be four pixels and one period (2 pi), and a phase mode is added on the basis of the blazed grating to obtain pure phase modulation and pure amplitude modulation; obtaining a phase hologram by adding the spot pattern to a blazed grating function; in amplitude modulation, the hologram is generated by multiplying a light spot pattern by a blazed grating function;
(3) the spatial filtering is carried out on the spatial light modulator by using a 4f system, the plane of the light modulator (SLM 1) modulated by a light field is arranged on the front focal plane of the 4f system, a spatial filtering square hole is arranged on a first-order frequency to filter the first-order frequency, and the plane of the light modulator (SLM 2) of a phase object is arranged on the rear focal plane of the 4f system;
(4) to obtain coherent superposition information, fourier transform is performed on the object (SLM 2 plane) using a lens to obtain: and detecting the zero-order frequency intensity of the object plane by using a point detector:
where N is the number of pixels, I (x, y) represents the illumination modulation, t (x, y) represents the complex field,
representing complex amplitude forms of the object, A (x, y) and
respectively corresponding to the amplitude and the phase of the object;
(5) the modulation of light is divided into two parts, namely binary phase modulation and binary amplitude modulation, and the zero-order frequency intensity S of pure phase modulation is obtainedpAnd pure amplitude modulated zero-order frequency intensity Sq(ii) a A differential measurement is introduced in the modulation, each illumination pattern is displayed by combining a pair of opposing (0s, 1s) patterns and taking the difference, the pure phase and pure amplitude modulated modulation modes respectively.
The calculation demodulation process specifically comprises the following steps:
(1) differentiating the obtained signals to obtain differential signals corresponding to pure phase modulation: sp'＝Sp+-Sp-And a differential signal S corresponding to a pure amplitude modulationq'＝Sq+-Sq-Then, respectively obtaining a real part Re (x, y) and an imaginary part Im (x, y) of the complex amplitude of the object by using a correlation operation formula;
(2) obtaining complex field information U (x, y) Re (x, y) + i.im (x, y) by using the obtained real part and imaginary part information, and obtaining the phase distribution of the wrapped object by taking the phase part of the complex amplitude
Wherein α is a fixed phase difference;
(3) and for continuous phase objects, recovering the continuous phase of the object by using a phase unwrapping algorithm.
In order to obtain phase information, the invention performs independent phase and amplitude modulation under monochromatic illumination, measures the dc component of the object in the far field, obtains phase information of the object by modulating in phase and amplitude, respectively, and detecting their correlation, and determines a constant phase shift from the object itself.
The importance of the invention is that the necessity of interferometry in quantitative phase imaging is eliminated, which fundamentally means that the phase imaging method only requires spatial coherence of the illumination, which property provides advantages for the phase imaging method when the illumination has low temporal coherence but spatial coherence.
Drawings
Fig. 1 is a schematic diagram of an experimental apparatus for light field modulation detection.
Fig. 2 is a schematic diagram of the pair phase type differential projection mode and the pair amplitude type differential projection mode. Wherein (a) and (b) are the ith pair of phase-type differential projection modes used, and (c) and (d) are the ith pair of amplitude-type differential projection modes. To obtain a 128 × 128 resolution complex amplitude image, 128 × 2 pairs of such projection patterns are required.
Fig. 3 is a diagram showing the recovery result of the phase object (convex lens). Wherein (a) is the recovery result without phase unwrapping, and (b) is the phase recovery result after unwrapping.
Detailed Description
The invention comprises two processes of light field modulation detection and calculation demodulation:
the process of light field modulation detection: monochromatic plane light is used as a detection light source, a spatial light modulator of a pure phase type is used for respectively carrying out phase type and amplitude type aperture coding on the incident plane light, and coding matrixes are differential Hadamard matrixes. In order to obtain an optical field mode with high modulation efficiency, a phase type grating is loaded on a spatial light modulator, plane light is deflected for a certain angle, spatial filtering is carried out through a 4f system, and good phase type light spots and amplitude type light spots are obtained on a back focal plane of the system. The light spot is used for carrying out aperture coding on a phase object, a Fourier lens is applied to carry out Fourier transform on the object, and a point detector is used for obtaining the zero-order frequency intensity after the structured light and the object act.
And calculating a demodulation process: and carrying out differential operation on the obtained intensity values, wherein differential signals are projections of the object on the differential aperture codes, and when the projected aperture codes are enough to form a Hilbert inner product space, a series of intensity signals are obtained to be enough to recover the real part or the imaginary part of the object.
Fig. 1 shows an experimental setup for light field modulation detection. Wherein a He-Ne laser and a beam expander (comprising an objective lens, a 25um pinhole and a collimator lens) are used to generate a collimated beam. Two SLMs are used to implement the light field modulation (SLM 1) and the phase object (SLM 2), respectively, which are placed in the front and back focal planes of a 4-f system made of Lens 1 and Lens 2. The filter square is placed in the fourier plane of the 4-f system for spatial filtering. Lens 3 transforms the object under structured light illumination to its far field and places a pinhole detector there. A pinhole detector consisting of a pinhole of 15um diameter and a photodiode is used to detect the zero-order intensity of the effective diffraction field.
The detailed procedure for light field modulation detection is as follows:
(1) binary phase objects and gray scale phase objects are imaged on a phase-only liquid crystal Spatial Light Modulator (SLM) and a lens. The experimental set-up is shown in figure 1. A linearly polarized He — Ne laser light with a wavelength of 633nm λ is expanded to generate a monochromatic plane wave.
(2) A liquid crystal spatial light modulator (SLM 1) with a resolution of 1920 x 1080 pixels is used for binary structured modulation of the phase and amplitude of the incident light. In the modulation, only 512 x 512 pixel regions of the SLM 1 are actually used. By merging the 4 x 4 pixel array into superpixels, the effective modulation and imaging resolution is 128 x 128 pixels.
(3) The 4-f system made of lens 1 and lens 2 images the structured pattern onto the window of the second SLM (SLM 2) used as phase object. To ensure efficient phase modulation, blazed grating holograms are employed on both SLMs to produce diffraction, and only the first order diffraction after the SLM is used. After the SLM 1, the first order diffractive illumination is selected by an aperture in the fourier plane of the 4-f system.
(4) For the SLM 2, spatial filtering is done through a fourier transform lens 3 and a pinhole in its back focal plane. A pixel detector (SPD) is placed directly behind the pinhole to record the signal. It should be emphasized that the pinhole is small enough so that it selects only the zeroth power of the effective diffraction field.
(5) In order to maximize the correlation efficiency, an orthogonal Hadamard matrix is selected as a projection matrix, and matrix elements +/-1 well meet the requirement of differential measurement in the method. As described above, each illumination pattern is displayed by combining a pair of opposing (0s, 1s) patterns and taking the difference thereof. For the present invention, 128 pixels will be used at a resolution of 128 by 128 pixels2The Hadamard matrix of order is derived for 32768 pairs of (0s, 1s) modulation modes. As shown in fig. 2. The same modulation sequence is performed independently in both phase and amplitude. In the phase modulation, the modulation amount is set to pi/2, so the actual modulation mode is (0s, pi/2 s). The phase hologram is obtained by adding the (0s, pi/2 s) mode and the blazed grating function. In amplitude modulation, the hologram is generated by multiplying a (0s, 1s) pattern by a blazed grating function.
Calculating demodulation: and differentiating the obtained signals to obtain a series of differential signals. And respectively obtaining a real part Re (x, y) and an imaginary part Im (x, y) of the complex amplitude of the object by using a correlation operation formula. Obtaining: and taking the phase part of the complex amplitude to obtain the phase distribution of the wrapped object. And then recovering the object phase by using a phase unwrapping algorithm.
The specific process of calculating the demodulation is as follows:
(1) differentiating the obtained signals to obtain differential signals corresponding to pure phase modulation: sp'＝Sp+-Sp-And a differential signal S corresponding to a pure amplitude modulationq'＝Sq+-Sq-. And then respectively obtaining the real part of the complex amplitude of the object by using a correlation operation formula: re (x, y) and imaginary part: im (x, y).
(2) Obtaining complex field information U (x, y) Re (x, y) + i.im (x, y) by using the obtained real part and imaginary part information, and obtaining the phase part of the complex amplitude to obtain the wrapped informationPhase distribution of living body
Where α is a fixed phase difference, and for a particular object, the value of α is fixed and does not affect the overall distribution of the phase.
(3) For continuous phase objects, a phase unwrapping algorithm may be used to recover the continuous phase of the object, as shown in fig. 3.
Claims (3)
1. A non-interference quantitative phase imaging method based on a single-pixel detector is characterized in that: the method comprises two processes of light field modulation detection and calculation demodulation;
the process of light field modulation detection: using monochromatic plane light as a detection light source, and respectively carrying out phase type and amplitude type aperture coding on the incident plane light by using a pure-phase spatial light modulator, wherein the coding matrixes are differential Hadamard matrixes; loading a phase type grating on a spatial light modulator, deflecting plane light to meet the modulation requirement of the spatial light modulator, performing spatial filtering on the spatial light modulator by using a 4f system, placing the light modulator plane modulated by a light field on a front focal plane of the 4f system, placing a spatial filtering square hole on a primary frequency to filter the primary frequency, and placing the light modulator plane of a phase object on a rear focal plane of the 4f system; obtaining a phase type light spot and an amplitude type light spot on a back focal plane of a 4f system, carrying out aperture coding on a phase object by using the light spots, applying a Fourier lens to carry out Fourier transform on the object, and obtaining zero-order frequency intensity after the structured light and the object act by using a point detector;
and calculating a demodulation process: and carrying out differential operation on the obtained zero-order frequency intensity value, wherein a differential signal is the projection of the object on a differential aperture code, when the projected aperture code is enough to form a Hilbert inner product space, a series of intensity signals are obtained to be enough to recover the real part or the imaginary part of the object, a complex amplitude real part of the phase object is obtained by using phase type aperture code modulation and demodulation, a complex amplitude imaginary part of the phase object is obtained by using amplitude type aperture code modulation and demodulation, and complex light field information is obtained by combining the real part and the imaginary part to obtain object phase information.
2. The method of claim 1, wherein the method comprises: the light field modulation detection process specifically comprises the following steps:
(1) using He-Ne laser as coherent light source, selecting linear polarization laser, changing the polarization direction of coherent light by rotating the angle of laser to meet the modulation requirement of spatial light modulator, filtering the laser light source by using spatial filter to generate single-mode collimation plane light beam;
(2) the method comprises the steps that a phase type spatial light modulator is used for modulating a plane light beam, in order to obtain a light field mode with high modulation efficiency, a blazed grating is loaded on the light modulator to generate diffraction, the blazed grating is designed into four pixels and one period, and then the phase mode is added on the basis of the blazed grating to obtain pure phase modulation and pure amplitude modulation; obtaining a phase hologram by adding the spot pattern to a blazed grating function; in amplitude modulation, the hologram is generated by multiplying a light spot pattern by a blazed grating function;
(3) the spatial filtering is carried out on the spatial light modulator by using a 4f system, the light modulator plane modulated by a light field is arranged on the front focal plane of the 4f system, a spatial filtering square hole is arranged on a first-order frequency to filter the first-order frequency, and the light modulator plane of a phase object is arranged on the rear focal plane of the 4f system;
(4) in order to obtain coherent superposition information, a lens is used for carrying out Fourier transform on an object to obtain: and detecting the zero-order frequency intensity of the object plane by using a point detector:
where N is the number of pixels, I (x, y) represents the illumination modulation, t (x, y) represents the complex field,
representing complex amplitude forms of the object, A (x, y) and
are respectively provided withAmplitude and phase of the corresponding object;
(5) the modulation of light is divided into two parts, namely binary phase modulation and binary amplitude modulation, and the zero-order frequency intensity S of pure phase modulation is obtainedpAnd pure amplitude modulated zero-order frequency intensity Sq(ii) a A differential measurement is introduced in the modulation, each illumination pattern is displayed by combining a pair of opposing (0s, 1s) patterns and taking the difference, the pure phase and pure amplitude modulated modulation modes respectively.
3. The method of claim 1, wherein the method comprises: the calculation demodulation process specifically comprises the following steps:
(1) differentiating the obtained signals to obtain differential signals corresponding to pure phase modulation: sp'＝Sp+-Sp-And a differential signal S corresponding to a pure amplitude modulationq'＝Sq+-Sq-Then, respectively obtaining a real part Re (x, y) and an imaginary part Im (x, y) of the complex amplitude of the object by using a correlation operation formula;
(2) obtaining complex field information U (x, y) Re (x, y) + i.im (x, y) by using the obtained real part and imaginary part information, and obtaining the phase distribution of the wrapped object by taking the phase part of the complex amplitude
Wherein α is a fixed phase difference;
(3) and for continuous phase objects, recovering the continuous phase of the object by using a phase unwrapping algorithm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911157438.XA CN110864817B (en) | 2019-11-22 | 2019-11-22 | Non-interference quantitative phase imaging method based on single-pixel detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911157438.XA CN110864817B (en) | 2019-11-22 | 2019-11-22 | Non-interference quantitative phase imaging method based on single-pixel detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110864817A CN110864817A (en) | 2020-03-06 |
| CN110864817B true CN110864817B (en) | 2021-02-12 |
Family
ID=69655983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911157438.XA Active CN110864817B (en) | 2019-11-22 | 2019-11-22 | Non-interference quantitative phase imaging method based on single-pixel detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110864817B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684463B (en) * | 2020-12-21 | 2024-03-26 | 武汉光目科技有限公司 | Area array sweep frequency measuring device and method |
| CN113834442A (en) * | 2021-09-23 | 2021-12-24 | 河北大学 | Coherent single-pixel imaging system and imaging method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2073198A1 (en) * | 2007-12-17 | 2009-06-24 | Kabushiki Kaisha Toshiba | Optical information recording apparatus and method |
| CN102109414A (en) * | 2010-12-15 | 2011-06-29 | 深圳大学 | Method and device for calibrating phase modulation of spatial light modulators by utilizing heterodyne interference |
| CN103105236A (en) * | 2013-01-18 | 2013-05-15 | 电子科技大学 | Method used for liquid crystal optical phase modulator phase detection |
| CN103916574A (en) * | 2012-12-28 | 2014-07-09 | 株式会社日立制作所 | Imaging device |
| CN107942523A (en) * | 2017-12-05 | 2018-04-20 | 安徽大学 | A kind of phase recovery system calculated based on light intensity transmission measurement |
| CN109035282A (en) * | 2018-08-02 | 2018-12-18 | 吉林工程技术师范学院 | The thresholding method of Hadamard coded modulation relevance imaging |
| CN109410153A (en) * | 2018-12-07 | 2019-03-01 | 哈尔滨工业大学 | Object phase restoration methods based on code aperture and spatial light modulator |
| CN109596227A (en) * | 2018-12-06 | 2019-04-09 | 浙江大学 | A kind of phase recovery detection system of the optical element intermediate frequency error of convolutional neural networks priori enhancing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4369762B2 (en) * | 2004-01-06 | 2009-11-25 | Ｔｄｋ株式会社 | Holographic recording method and holographic recording apparatus |
| JP4524708B2 (en) * | 2008-06-19 | 2010-08-18 | ソニー株式会社 | Playback device and playback method |
-
2019
- 2019-11-22 CN CN201911157438.XA patent/CN110864817B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2073198A1 (en) * | 2007-12-17 | 2009-06-24 | Kabushiki Kaisha Toshiba | Optical information recording apparatus and method |
| CN102109414A (en) * | 2010-12-15 | 2011-06-29 | 深圳大学 | Method and device for calibrating phase modulation of spatial light modulators by utilizing heterodyne interference |
| CN103916574A (en) * | 2012-12-28 | 2014-07-09 | 株式会社日立制作所 | Imaging device |
| CN103105236A (en) * | 2013-01-18 | 2013-05-15 | 电子科技大学 | Method used for liquid crystal optical phase modulator phase detection |
| CN107942523A (en) * | 2017-12-05 | 2018-04-20 | 安徽大学 | A kind of phase recovery system calculated based on light intensity transmission measurement |
| CN109035282A (en) * | 2018-08-02 | 2018-12-18 | 吉林工程技术师范学院 | The thresholding method of Hadamard coded modulation relevance imaging |
| CN109596227A (en) * | 2018-12-06 | 2019-04-09 | 浙江大学 | A kind of phase recovery detection system of the optical element intermediate frequency error of convolutional neural networks priori enhancing |
| CN109410153A (en) * | 2018-12-07 | 2019-03-01 | 哈尔滨工业大学 | Object phase restoration methods based on code aperture and spatial light modulator |
Non-Patent Citations (3)
| Title |
|---|
| Hayasaki.Phase imaging using a single-pixel camera.《OPTICAL MEASUREMENT SYSTEMS FOR INDUSTRIAL INSPECTION X》.2017, * |
| 基于光强传播方程的相位恢复;王潇;《光学学报》;20071231;全文 * |
| 完全多重网格法求解光强度传播方程的相位恢复方法;薛斌党;《光学学报》;20091231;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110864817A (en) | 2020-03-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Schnars et al. | Digital recording and numerical reconstruction of holograms | |
| JP5648193B2 (en) | Interference measuring apparatus and interference measuring method | |
| EP3677969B1 (en) | Holographic imaging device and data processing method therefor | |
| US20120044320A1 (en) | High resolution 3-D holographic camera | |
| EP1230576B1 (en) | System and method for recovering phase information of a wave front | |
| Kulkarni et al. | Optical measurement techniques–A push for digitization | |
| CN109709786B (en) | Super-resolution digital holographic imaging system and imaging method | |
| KR101899026B1 (en) | Digital Holographic Reconstruction Apparatus and Method Using Single Generated Phase Shifting Method | |
| CN110864817B (en) | Non-interference quantitative phase imaging method based on single-pixel detector | |
| Tiziani et al. | From speckle pattern photography to digital holographic interferometry | |
| CN105973164A (en) | Digital holographic microscopy method based on pixel polarizer array | |
| Kang | An effective method for reducing speckle noise in digital holography | |
| US20220113674A1 (en) | Differential holography | |
| Rodríguez-Zurita et al. | Single shot phase-shifting interferometry with q=±1 optical vortices and modulation of polarization | |
| Loomis et al. | High-speed phase recovery using chromatic transport of intensity computation in graphics processing units | |
| JP4921775B2 (en) | Recording medium deformation measuring apparatus, deformation amount analyzing apparatus, and recording medium deformation measuring method | |
| Bavigadda et al. | Vibration phase mapping using holographic optical element-based electronic speckle pattern interferometry | |
| CN110986828B (en) | Novel acquisition and display method for three-dimensional color data of real scene | |
| Osten | Active metrology by digital holography | |
| JP5258052B2 (en) | Shape measuring method and shape measuring device by phase shift method, complex amplitude measuring method and complex amplitude measuring device | |
| Zhang et al. | Incoherent frequency-selective phase coded holography and axial overlap information stripping | |
| Fu et al. | Deep learning-based binocular composite color fringe projection profilometry for fast 3D measurements | |
| US20230359147A1 (en) | Image reproduction device, hologram recording device, and digital holography device | |
| Psota et al. | Comprehensive time average digital holographic vibrometry | |
| Schnars et al. | CCD recording and numerical reconstruction of holograms and holographic interferograms |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |