CN113031421A - Phase information training set generation method and device, terminal equipment and storage medium - Google Patents

Abstract

The application provides a method and a device for generating a phase information training set, a terminal device and a storage medium, wherein the method comprises the following steps: emitting a laser beam to perform polarization splitting to obtain first polarized light and second polarized light; loading a preset phase diagram in the spatial light modulator, and injecting the first polarized light into the spatial light modulator for light modulation to obtain modulated light; the second polarized light and the modulated light are emitted into the quarter-wave plate and the polarization group, and the direction of the optical axis of the quarter-wave plate and the direction of the transmission axis of the polarizer are adjusted; controlling the quarter-wave plate and the polarization group to perform polarization interference on input light, and acquiring an optical signal to obtain an interference fringe pattern; and performing phase recovery on the interference fringe pattern to obtain a phase recovery pattern, and storing the interference fringe pattern and the phase recovery pattern to obtain a phase information training set. According to the invention, through loading the preset phase diagram and designing the phase recovery of the interference fringe diagram, the interference fringe diagram and the corresponding phase recovery diagram can be obtained so as to generate the phase information training set, and the training set generation efficiency is high.

Description

Method, device, terminal device and storage medium for generating phase information training set

technical field

The invention belongs to the field of phase imaging, and in particular relates to a method, device, terminal device and storage medium for generating a phase information training set.

Background technique

The traditional image acquisition equipment can only record the intensity information of the light field and cannot directly obtain the phase information. In the process of recovering the phase information by the traditional phase shift method, an accurate phase shift is required between the interferograms, which makes it easier to recover the phase information. Affected by the environment, the recovered phase map is inaccurate. Therefore, the phase information recovery method based on deep learning emerges as the times require.

Deep learning, as a method for machine learning of the inherent laws and representation levels of sample data, has promoted the development of artificial intelligence-related technologies. When applying deep learning methods for phase recovery, sufficient interference fringe patterns and corresponding phase maps are required as training sets. However, in the existing process of phase recovery based on deep learning, it is necessary to manually take images of the actual sample to obtain the corresponding interference fringe pattern as the phase information training set, which leads to cumbersome manual operations and reduces the Generation efficiency of training sets with phase information.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a method, device, terminal device and storage medium for generating a phase information training set, aiming to solve the problem of the training set caused by using manual photography to obtain the training set in the existing phase information training set generation process. Generate inefficiencies.

In a first aspect, an embodiment of the present application provides a method for generating a phase information training set, the method comprising:

Sending a laser beam for polarization splitting to obtain a first polarized light and a second polarized light;

Loading a preset phase map in the spatial light modulator, and injecting the first polarized light into the spatial light modulator;

controlling the spatial light modulator to perform light modulation to obtain modulated light;

The second polarized light and the modulated light are injected into the quarter-wave plate and the polarization group, and the direction of the optical axis of the quarter-wave plate and the transmission axis of the polarizer in the polarization group are adjusted direction;

Controlling the adjusted quarter-wave plate and the polarization group to perform polarization interference on the input light, and collecting the optical signal of the output light after the interference to obtain a plurality of interference fringe patterns;

Phase recovery is performed on the interference fringe pattern to obtain a phase recovery diagram, and the interference fringe pattern and the phase recovery diagram are stored to obtain a phase information training set.

Compared with the prior art, the embodiment of the present application has the beneficial effect that: by loading the design of the preset phase map in the spatial light modulator, the interference fringe pattern containing the required sample phase information can be obtained without an actual object , by adjusting the direction of the optical axis of the quarter-wave plate, the direction of the transmission axis of the polarizer in the polarization group and the design of phase recovery of the interference fringe pattern, multiple interference fringe patterns and corresponding The phase recovery map is used to generate the phase information training set, which prevents the phenomenon of low generation efficiency caused by the use of artificial shooting to generate the training set.

Further, injecting the second polarized light and the modulated light into a quarter-wave plate and a polarization group includes:

inputting the modulated light into an imaging lens for imaging, and combining the modulated light and the second polarized light transmitted by the imaging lens to obtain a combined beam;

The combined beam is input to the quarter wave plate and the polarization group.

Further, inputting the combined beam into the quarter-wave plate and the polarization group includes:

The combined beam is input into the quarter-wave plate, and the angle between the fast axis direction of the quarter-wave plate and the two linearly polarized lights in the combined beam is adjusted to 45° °;

The two linearly polarized lights in the combined beams are controlled to become circularly polarized lights after passing through the quarter-wave plate.

Further, the polarizing group includes four polarizers, and the light transmission axis directions of the four polarizers are corresponding to 0°, 45°, 90° and 135° with the horizontal axis, so that the resultant obtained after the polarization interference is obtained. The interference fringe patterns are 0 phase shift fringe pattern, π/2 phase shift fringe pattern, π phase shift fringe pattern and π3/2 phase shift fringe pattern.

Further, storing the interference fringe pattern and the phase recovery pattern to obtain a phase information training set, including:

The 0-phase shift fringe pattern and all the phase recovery patterns are stored correspondingly to obtain the phase information training set.

Further, the injecting the first polarized light into the spatial light modulator includes:

The first polarized light and the second polarized light are respectively subjected to beam expansion and collimation processing, and the processed first polarized light is injected into the spatial light modulator.

Further, the polarized light splitting of the emitted laser beam includes:

Controlling the laser to emit the laser beam, and inputting the laser beam into a filter for filtering;

inputting the filtered laser beam into a half-wave plate, and injecting the laser beam after being transmitted by the half-wave plate into a polarization beam splitter;

The polarizing beam splitter is controlled to split the emitted laser beam.

In a second aspect, an embodiment of the present application provides an apparatus for generating a phase information training set, including:

The polarization beam splitting module is used for emitting a laser beam for polarization splitting to obtain the first polarized light and the second polarized light;

a light modulation module, configured to load a preset phase map in the spatial light modulator, inject the first polarized light into the spatial light modulator, and control the spatial light modulator to perform light modulation to obtain modulated light;

an optical axis adjustment module for injecting the second polarized light and the modulated light into a quarter-wave plate and a polarization group, and adjusting the direction of the optical axis of the quarter-wave plate and the polarization group The direction of the transmission axis of the middle polarizer;

a polarization interference module, used for controlling the adjusted quarter-wave plate and the polarization group to perform polarization interference on the input light, and collecting the optical signal of the output light after the interference to obtain multiple interference fringe patterns;

The training set storage module is used for performing phase recovery on the interference fringe pattern to obtain a phase recovery picture, and storing the interference fringe pattern and the phase recovery picture to obtain a phase information training set.

In a third aspect, an embodiment of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, when the processor executes the computer program Implement the method as above.

In a fourth aspect, an embodiment of the present application provides a storage medium, where the storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

In a fifth aspect, an embodiment of the present application provides a computer program product that, when the computer program product runs on a terminal device, enables the terminal device to execute the method for generating a phase information training set according to any one of the first aspects above.

It can be understood that, for the beneficial effects of the second aspect to the fifth aspect, reference may be made to the relevant description in the first aspect, which is not repeated here.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art.

1 is a flowchart of a method for generating a phase information training set provided by the first embodiment of the present application;

2 is a flowchart of a method for generating a phase information training set provided by the second embodiment of the present application;

3 is a schematic structural diagram of an apparatus for generating a phase information training set provided by a third embodiment of the present application;

4 is a schematic structural diagram of an apparatus for generating a phase information training set provided by a fourth embodiment of the present application;

FIG. 5 is a schematic structural diagram of a terminal device provided by a fifth embodiment of the present application.

Detailed ways

In the following description, for the purpose of illustration rather than limitation, specific details such as a specific system structure and technology are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

It is to be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described feature, integer, step, operation, element and/or component, but does not exclude one or more other The presence or addition of features, integers, steps, operations, elements, components and/or sets thereof.

It will also be understood that, as used in this specification and the appended claims, the term "and/or" refers to and including any and all possible combinations of one or more of the associated listed items.

As used in the specification of this application and the appended claims, the term "if" may be contextually interpreted as "when" or "once" or "in response to determining" or "in response to detecting ". Similarly, the phrases "if it is determined" or "if the [described condition or event] is detected" may be interpreted, depending on the context, to mean "once it is determined" or "in response to the determination" or "once the [described condition or event] is detected. ]" or "in response to detection of the [described condition or event]".

In addition, in the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the description, and should not be construed as indicating or implying relative importance.

References in this specification to "one embodiment" or "some embodiments" and the like mean that a particular feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in other embodiments," etc. in various places in this specification are not necessarily All refer to the same embodiment, but mean "one or more but not all embodiments" unless specifically emphasized otherwise. The terms "including", "including", "having" and their variants mean "including but not limited to" unless specifically emphasized otherwise.

Example 1

Please refer to FIG. 1 , which is a flowchart of a method for generating a phase information training set provided by the first embodiment of the present application, including the steps:

Step S10, emitting a laser beam to perform polarization splitting to obtain a first polarized light and a second polarized light;

Among them, the single-frequency laser can be used to transmit the laser beam. Since the laser beam emitted by the single-frequency laser has the advantages of monochromaticity, good directionality, coherence, and constant phase difference, therefore, the single-frequency laser emits The laser beam is suitable to generate interference fringes in the training set of phase information.

In this step, the laser beam is divided into two polarized beams by designing polarized beam splitting. Specifically, in this step, a multilayer film structure can be coated on the inclined surface of the right angle prism, and then Glue into a cube structure, using the property that the transmittance of P polarized light is 1 and the transmittance of S polarized light is less than 1 when light is incident at Brewster angle, after the laser beam passes through the multilayer film structure at Brewster angle for many times, Two linearly polarized lights with perpendicular polarization directions are obtained, one is used as the first polarized light, and the other is used as the second polarized light.

Step S20, loading a preset phase map in the spatial light modulator, injecting the first polarized light into the spatial light modulator, and controlling the spatial light modulator to perform light modulation to obtain modulated light;

Among them, because the spatial light modulator can modulate a certain parameter of the light field through liquid crystal molecules, for example, by modulating the amplitude of the light field, modulating the phase by the refractive index, modulating the polarization state by the rotation of the polarization plane, or realizing incoherent to coherent light Therefore, in this step, the first polarized light is modulated by controlling the loading of a preset phase map in the spatial light modulator, so that the first polarized light is modulated. The output modulated light carries the phase information of the loaded preset phase map.

Preferably, the quantity and phase information of the preset phase map can be set according to requirements, and the model of the spatial light modulator can also be selected according to requirements, for example, a 1536x1536 pure phase ultra-high-speed liquid crystal spatial light modulator or a 1920x1152 pure phase Liquid crystal spatial light modulator, etc.

Step S30, inject the second polarized light and the modulated light into the quarter-wave plate and the polarization group, and adjust the direction of the optical axis of the quarter-wave plate and the polarization of the polarizer in the polarization group. Transmitting axis direction;

Preferably, the assembly positions of the polarizers in the polarizing group can be assembled and fixed by splicing with the vertical plane, that is, the side walls between adjacent polarizers are connected.

Step S40, controlling the adjusted quarter-wave plate and the polarization group to perform polarization interference on the input light, and collecting the optical signal of the output light after the interference, to obtain multiple interference fringe patterns;

Wherein, by controlling the adjusted quarter-wave plate and the polarization group to perform polarization interference design on the input light, the phase in the incident second polarized light and the modulated light can be effectively adjusted. After the information is polarized and phase shifted, and based on the collection of the optical signal, multiple interference fringe patterns with different phase information are obtained.

Specifically, in this step, the optical signal may be collected by means of a camera, and the corresponding interference fringe image may be recorded based on the collection result of the optical signal. The model of the camera can be selected according to requirements, for example, a CMOS camera can be used to collect the optical signal.

Step S50, performing phase recovery on the interference fringe pattern to obtain a phase recovery diagram, and storing the interference fringe pattern and the phase recovery diagram to obtain a phase information training set;

Among them, the interference fringe pattern can be phase-recovered by adopting the phase shift method to obtain the corresponding phase recovery pattern, and the phase information training set can be obtained by storing the interference fringe pattern and the corresponding phase recovery pattern, and by storing the interference fringe pattern and the corresponding phase recovery pattern The phase information training set is input into a neural network model for model training. When the neural network model converges and passes the test, the neural network model can be applied to the recovery of phase information.

In this embodiment, by loading the design of the preset phase map in the spatial light modulator, the interference fringe pattern containing the required sample phase information can be obtained without an actual object, and by adjusting the quarter-wave plate The direction of the optical axis, the direction of the light transmission axis of the polarizer in the polarization group, and the design of phase recovery for the interference fringe pattern can obtain multiple interference fringe patterns and corresponding phase recovery patterns to generate a phase information training set, preventing It solves the phenomenon of low generation efficiency caused by the use of artificial shooting to generate training sets.

Embodiment 2

Please refer to FIG. 2 , which is a flowchart of a method for generating a phase information training set provided by the second embodiment of the present application, including the steps:

Step S11, controlling the laser to emit a laser beam, and inputting the laser beam into a filter for filtering processing;

Among them, the filter adopts a neutral density filter, and the neutral density filter plays a non-selective filtering role, and the ability to reduce light of various wavelengths is equal and uniform, which is convenient for targeting The intensity of the laser beam is controlled to prevent overexposure.

Step S21, inputting the filtered laser beam into the half-wave plate, and injecting the laser beam transmitted by the half-wave plate into the polarization beam splitter;

Specifically, for example, if the angle between the vibration surface and the fast axis (or slow axis) of the wave plate is θ when the linearly polarized light is incident, then the vibration surface of the transmitted linearly polarized light rotates toward the fast axis (or slow axis) Through the 2θ angle, it can be used in conjunction with the subsequent polarization beam splitter to control the intensity ratio of the two beams of polarized light.

Step S31, controlling the polarization beam splitter to split the emitted laser beam to obtain the first polarized light and the second polarized light;

Wherein, the obtained first polarized light and the second polarized light are both linearly polarized light, the first polarized light is object light, and the second polarized light is reference light.

Step S41, performing beam expansion and collimation processing on the first polarized light and the second polarized light respectively;

Wherein, by performing beam expansion processing on the first polarized light and the second polarized light, the beam diameter and divergence angle of the first polarized light and the second polarized light can be effectively adjusted. It is collimated with the second polarized light, so that the first polarized light and the second polarized light can be effectively expanded and then irradiated in the form of parallel light, thereby effectively improving the space between the first polarized light and the space. Stability of beam transport between light modulators.

Step S51, loading a preset phase map in the spatial light modulator, injecting the first polarized light into the spatial light modulator, and controlling the spatial light modulator to perform light modulation to obtain modulated light;

Among them, because the spatial light modulator can modulate a certain parameter of the light field through liquid crystal molecules, for example, by modulating the amplitude of the light field, modulating the phase by the refractive index, modulating the polarization state by the rotation of the polarization plane, or realizing incoherent to coherent light Therefore, in this step, the first polarized light is modulated by controlling the loading of a preset phase map in the spatial light modulator, so that the first polarized light is modulated. The output modulated light carries the phase information of the loaded preset phase map.

Step S61, input the modulated light into the imaging lens for imaging, and combine the modulated light transmitted by the imaging lens and the second polarized light to obtain the combined beam;

The design of imaging the modulated light effectively facilitates the user to view the modulated light, and facilitates the adjustment of the clarity of the subsequent interference fringe pattern;

Preferably, in this step, a beam combiner can be used to perform beam combining processing between the modulated light and the second polarized light, thereby effectively improving the beam transmission stability of the modulated light and the second polarized light.

Step S71, inputting the combined beam into the quarter-wave plate, and adjusting the direction of the fast axis of the quarter-wave plate and the input directions of the two linearly polarized lights in the combined beam to 45°;

Step S81, the two linearly polarized lights in the combined beams become circularly polarized lights after passing through the quarter-wave plate;

Wherein, the modulated light and the second polarized light in the combined beam are circularly polarized light by passing the combined beam through the design of the quarter-wave plate.

Step S91, inject the combined beam into the polarization group, and adjust the direction of the light transmission axis of the polarizer in the polarization group;

Preferably, in this embodiment, the polarizing group includes four polarizers, and the directions of the light transmission axes of the four polarizers are 0°, 45°, 90°, and 135° with respect to the horizontal axis, so that the polarizations interfere with each other. The obtained interference fringe pattern is a 0 phase shift fringe pattern, a π/2 phase shift fringe pattern, a π phase shift fringe pattern and a π3/2 phase shift fringe pattern.

Step S101, controlling the adjusted quarter-wave plate and the polarization group to perform polarization interference on the input light, and collecting the optical signal of the output light after the interference, to obtain a plurality of interference fringe patterns;

Wherein, the optical signal can be collected by using a camera, and the corresponding interference fringe image can be recorded based on the collection result of the optical signal. The model of the camera can be selected according to requirements, for example, a CMOS camera can be used to collect the optical signal.

四分之一波片和偏振片组的琼斯矩阵分别为

和

则偏振片的后光场的琼斯向量和光强分布分别为：Specifically, in this embodiment, the Jones vector of the light field in front of the quarter-wave plate is

The Jones matrices of the quarter-wave plate and the polarizer group are respectively

and

Then the Jones vector and light intensity distribution of the back light field of the polarizer are:

Among them, a and b represent the amplitudes of the second polarized light and the first polarized light respectively, and the square of the amplitude is the light intensity. Therefore, in this step, different θ angles can be used to obtain interferograms with different phase shifts.

In this embodiment, the light transmission axis directions of the four polarizers in the polarizing group correspond to 0°, 45°, 90° and 135° with respect to the horizontal axis, that is, the setting directions of the light transmission axes of the four polarizers are 0°, 45°, 90° and 135° with respect to the horizontal axis. π/4, π/2, π3/4, therefore, the corresponding interference fringe pattern is:

Step S111, performing phase recovery on the interference fringe pattern to obtain a phase recovery pattern, and correspondingly storing the 0-phase shift fringe pattern and all phase recovery patterns to obtain a phase information training set;

Wherein, the phase recovery of the interference fringe pattern can be performed by adopting a four-step phase shift method, so as to obtain a corresponding phase recovery pattern.

使用四步相移法恢复相位即可得到相应的相位图T_n，其中n＝1，2，3…k，并通过将0相移量干涉条纹图和所有所述相位恢复图对应存储至神经网络中，即可作为相位信息训练集。Specifically, in this embodiment, the camera can obtain four interference fringe patterns with phase shifts of 0, π/2, π, and π3/2, respectively, after shooting once.

The corresponding phase map T _n can be obtained by recovering the phase using the four-step phase shifting method, where n=1, 2, 3... In the network, it can be used as the phase information training set.

In this embodiment, by loading the design of the preset phase map in the spatial light modulator, the interference fringe pattern containing the required sample phase information can be obtained without an actual object, and by adjusting the quarter-wave plate The direction of the optical axis, the direction of the light transmission axis of the polarizer in the polarization group, and the design of phase recovery for the interference fringe pattern can obtain multiple interference fringe patterns and corresponding phase recovery patterns to generate a phase information training set, preventing In order to avoid the phenomenon of low generation efficiency caused by the use of artificial photography to generate the training set, this embodiment uses the spatial light modulator to load the simulated phase object into the object optical path to obtain the interference fringe pattern, without interferometric measurement on the actual sample. Simple, time-consuming, easy to control, and eliminates the influence of the optical properties of the sample on the interference results, making the measurement results more accurate. The influence of factors such as environmental vibration, airflow, and background light on the interference results enables the phase information to be accurately recovered from the four phase shift maps, so that the generated phase information training set has high accuracy.

Embodiment 3

Corresponding to the method for generating a phase information training set described in the above embodiments, FIG. 3 shows a schematic structural diagram of an apparatus for generating a phase information training set provided by the third embodiment of the present application. Example relevant part.

3, the device includes: a single-frequency laser 1, a neutral density filter 2 located at the output end of the single-frequency laser 1, a half-wave plate 3 located at the transmission end of the neutral density filter 2, The polarizing beam splitting element 4 at the transmission end of the half-wave plate 3 , the plane mirror 5 and the first beam expanding collimation system 6 respectively disposed at the beam output end of the polarization beam splitting element 4 , and the second beam expanding and collimating system 6 disposed at the reflection end of the plane reflecting mirror 5 The beam expander collimation system 7, the first beam splitter 8 arranged at the output end of the first beam expander collimation system 6, the spatial light modulator 9 and the imaging lens 10 arranged at the output end of the first beam splitter 8, The second beam splitter 11 at the output end of the second beam expander and collimation system 7 , the quarter wave plate 12 at the output end of the second beam splitter 11 , and the polarization beam at the transmission end of the quarter wave plate 12 The film group 13 and the camera 14 arranged at the light output end of the polarizer group 13 .

Specifically, in this embodiment:

Single frequency laser 1, used to emit laser beam to neutral density filter 2;

The neutral density filter 2 is used to non-selectively filter the laser beam emitted by the single-frequency laser 1 to prevent the laser beam from being overexposed;

The polarization beam splitting element 4 is used for polarization splitting the laser beam, so that the laser beam is divided into two linearly polarized lights with vertical polarization directions, the first polarized light is the object light, and the second polarized light is the reference light;

The half-wave plate 3 is used to change the light intensity ratio between the object light and the reference light, so as to obtain interference fringes with higher contrast;

The plane mirror 5 is used to refract the second polarized light, so that the second polarized light is injected into the second beam expansion and collimation system 7;

The first beam expansion and collimation system 6 and the second beam expansion and collimation system 7 are respectively used to perform beam expansion and collimation processing on the object light and the reference light;

The first beam splitter 8 is used to divide a beam of light into two beams of light or multiple beams of light, and can also be used as a beam combiner. In this embodiment, it is used to change the optical path of the output light of the spatial light modulator 9;

The spatial light modulator 9 is used to load the required preset phase map, and modulate the incident light (object light), so that the output modulated light has the phase information of the preset phase map;

The imaging lens 10 is used to image the light (modulated light) reflected by the spatial light modulator 9, so that the camera 14 can detect a clear image;

The second beam splitter 11 is used to divide a beam of light into two beams or multiple beams of light, and can also be used as a beam combiner. In this embodiment, it is used to combine the modulated light output by the spatial light modulator 9 and the reference light into a a beam of light;

The quarter-wave plate 12 is used to convert the two linearly polarized beams of the passing combined beams into circularly polarized beams;

The polarizing plate group 13 is used in conjunction with the quarter-wave plate 12 to perform polarization interference on the input light, so that the output light has different phase shifts;

The camera 14 is used to collect the optical signal of the light after the polarization interference of the polarizer group 13, and obtain the interference fringe pattern of the phase object with different phase shifts;

The specific operation steps of this embodiment are as follows:

Step 1: The laser emitted by the single-frequency laser 1 is split into two linearly polarized beams after being split by the polarization beam splitting element 4, one beam is reflected by the plane mirror 5 as a reference beam, and the other beam is modulated by the spatial light modulator 9. as object light;

和

且偏振方向互相垂直。Among them, the complex amplitudes are

and

And the polarization directions are perpendicular to each other.

Step 2: set the fast axis of the quarter-wave plate 12 to form 45° with the x-axis, and the direction of the light transmission axis of the polarizer in the polarizer group 13 to form an angle of θ with the x-axis;

四分之一波片和偏振片组的琼斯矩阵分别为

和

则偏振片的后光场的琼斯向量和光强分布分别为：Among them, the Jones vector of the light field in front of the quarter-wave plate is

The Jones matrices of the quarter-wave plate and the polarizer group are respectively

and

Then the Jones vector and light intensity distribution of the back light field of the polarizer are:

Among them, a and b represent the amplitudes of the second polarized light and the first polarized light respectively, and the square of the amplitude is the light intensity. Therefore, in this step, different θ angles can be used to obtain interferograms with different phase shifts.

Step 3: set the direction of the polarizer light transmission axis of the polarizer group 13 to be 0, π/4, π/2, and π3/4;

Among them, the corresponding obtained interference fringe pattern is:

In step 4, the interference fringe pattern is collected by the camera 14, phase recovery is performed on the interference fringe pattern to obtain a phase recovery pattern, and the 0-phase shift fringe pattern and all the phase recovery patterns are stored correspondingly to obtain the phase recovery pattern. Information training set;

使用四步相移法恢复相位即可得到相应的相位图T_n，其中n＝1，2，3…k，并通过将0相移量干涉条纹图和所有所述相位恢复图对应存储至神经网络中，即可作为相位信息训练集。Among them, the camera 14 can obtain four interference fringe patterns with phase shifts of 0, π/2, π, and π3/2, respectively, by taking one shot.

The corresponding phase map T _n can be obtained by recovering the phase using the four-step phase shifting method, where n=1, 2, 3... In the network, it can be used as the phase information training set.

In this embodiment, by using the spatial light modulator 9 to load the simulated phase object into the object optical path to obtain the interference fringe pattern, there is no need to perform interferometric measurement on the actual sample, the operation is simple, the time consumption is short, the control is easy, and the sample itself is eliminated. The influence of optical properties on the interference results makes the measurement results more accurate, and through the design of co-channel interference between the modulated light and the second polarized light, the influence of environmental vibration, airflow, background light and other factors on the interference results is effectively suppressed , so that the phase information can be accurately recovered from the four phase shift maps, so that the generated phase information training set has high accuracy.

Embodiment 4

Corresponding to the method for generating a phase information training set described in the above embodiments, FIG. 4 shows a schematic structural diagram of an apparatus 100 for generating a phase information training set provided in the fourth embodiment of the present application. Apply for the relevant part of the example.

Referring to Figure 4, the device includes:

The polarization beam splitting module 101 is used for emitting a laser beam to perform polarization splitting to obtain a first polarized light and a second polarized light.

In addition, the polarization beam splitting module 101 is also used for: controlling the laser to emit the laser beam, and inputting the laser beam into a filter for filtering processing; inputting the filtered laser beam into a half wave The laser beam transmitted by the half-wave plate is injected into a polarizing beam splitter; the polarizing beam splitter is controlled to split the emitted laser beam, wherein by adjusting the half-wave The direction of the optical axis of the sheet can control the ratio of the light intensity of the two linearly polarized lights.

The light modulation module 102 is configured to load a preset phase map in the spatial light modulator, inject the first polarized light into the spatial light modulator, and control the spatial light modulator to perform light modulation to obtain modulation Light.

The light modulation module 102 is further configured to: perform beam expansion and collimation processing on the first polarized light and the second polarized light respectively, and inject the processed first polarized light into the space light modulator.

The optical axis adjustment module 103 is used to inject the second polarized light and the modulated light into the quarter-wave plate and the polarization group, and adjust the direction of the optical axis of the quarter-wave plate and the polarization The direction of the transmission axis of the polarizers in the group.

Wherein, the optical axis adjustment module 103 is further configured to: input the combined beam into the quarter-wave plate, and combine the fast axis direction of the quarter-wave plate with the combined beam The included angle between the two linearly polarized lights is adjusted to 45°; the two linearly polarized lights in the combined beams are controlled to become circularly polarized light after passing through the quarter-wave plate.

The polarization interference module 104 is used for: inputting the modulated light into an imaging lens for imaging, and combining the modulated light and the second polarized light transmitted by the imaging lens to obtain a combined beam; The combined beam is input to the quarter wave plate and the polarization group.

Preferably, the polarization interference module 104 is further configured to: control the adjusted quarter-wave plate and the polarization group to perform polarization interference on the input light, and collect the optical signal of the combined beam after the interference, Obtain multiple interference fringe patterns.

In this embodiment, the polarization group includes four polarizers, and the light transmission axis directions of the four polarizers are 0°, 45°, 90°, and 135° with respect to the horizontal axis, so that after polarization interference, the The interference fringe pattern is a 0 phase shift fringe pattern, a π/2 phase shift fringe pattern, a π phase shift fringe pattern and a π3/2 phase shift fringe pattern.

The training set storage module 105 is configured to perform phase recovery on the interference fringe pattern to obtain a phase recovery diagram, and store the interference fringe pattern and the phase recovery diagram to obtain a phase information training set.

Wherein, the training set storage module 105 is further configured to store the 0-phase shift fringe pattern and all the phase recovery patterns correspondingly to obtain the phase information training set.

In this embodiment, by loading the design of the preset phase map in the spatial light modulator, the interference fringe pattern containing the required sample phase information can be obtained without an actual object, and by adjusting the quarter-wave plate The direction of the optical axis, the direction of the light transmission axis of the polarizer in the polarization group, and the design of phase recovery for the interference fringe pattern can obtain multiple interference fringe patterns and corresponding phase recovery patterns to generate a phase information training set, preventing It solves the phenomenon of low generation efficiency caused by the use of artificial shooting to generate training sets.

It should be noted that the information exchange, execution process and other contents between the above-mentioned devices/modules are based on the same concept as the method embodiments of the present application. For specific functions and technical effects, please refer to the method embodiments section. It is not repeated here.

FIG. 5 is a schematic structural diagram of a terminal device 106 according to a fifth embodiment of the present application. As shown in FIG. 5 , the terminal device 106 in this embodiment includes: at least one processor 107 (only one processor is shown in FIG. 5 ), a memory 108 , and a memory 108 that is stored in the memory 108 and can be processed in the at least one processor The computer program 109 running on the processor 107, when the processor 107 executes the computer program 109, implements the steps in any of the foregoing method embodiments.

The terminal device 106 may be a computing device such as a desktop computer, a notebook, a palmtop computer, and a cloud server. The terminal device may include, but is not limited to, the processor 107 and the memory 108 . Those skilled in the art can understand that FIG. 5 is only an example of the terminal device 106, and does not constitute a limitation on the terminal device 106, and may include more or less components than the one shown, or combine some components, or different components , for example, may also include input and output devices, network access devices, and the like.

The so-called processor 107 may be a central processing unit (Central Processing Unit, CPU), and the processor 107 may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuits) , ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 108 may be an internal storage unit of the terminal device 106 in some embodiments, such as a hard disk or a memory of the terminal device 106 . In other embodiments, the memory 108 may also be an external storage device of the terminal device 106, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital Secure Digital, SD) card, flash memory card (Flash Card), etc. Further, the memory 108 may also include both an internal storage unit of the terminal device 106 and an external storage device. The memory 108 is used to store an operating system, an application program, a boot loader (Boot Loader), data, and other programs, such as program codes of the computer program, and the like. The memory 108 may also be used to temporarily store data that has been or will be output.

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. Module completion, that is, dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit, and the above-mentioned integrated units may adopt hardware. It can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present application. For the specific working process of the units and modules in the above-mentioned system, reference may be made to the corresponding process in the foregoing method embodiments, which will not be repeated here.

An embodiment of the present application also provides a network device, the network device includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, the processor executing The computer program implements the steps in any of the foregoing method embodiments.

Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the steps in the foregoing method embodiments can be implemented.

The embodiments of the present application provide a computer program product, when the computer program product runs on a mobile terminal, the steps in the foregoing method embodiments can be implemented when the mobile terminal executes the computer program product.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program to instruct the relevant hardware. The computer program can be stored in a computer-readable storage medium, and the computer program When executed by the processor, the steps of the above-mentioned various method embodiments may be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, and the like. The computer-readable medium may include at least: any entity or device capable of carrying computer program codes to the photographing device/terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), electrical carrier signal, telecommunication signal, and software distribution medium. For example, U disk, mobile hard disk, disk or CD, etc. In some jurisdictions, under legislation and patent practice, computer readable media may not be electrical carrier signals and telecommunications signals.

In the foregoing embodiments, the description of each embodiment has its own emphasis. For parts that are not described or described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the embodiments provided in this application, it should be understood that the disclosed apparatus/network device and method may be implemented in other manners. For example, the apparatus/network device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units. Or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above-mentioned embodiments, those of ordinary skill in the art should understand that: it can still be used for the above-mentioned implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the application, and should be included in the within the scope of protection of this application.

Claims (10)

1. A method for generating a phase information training set, wherein the method comprises: Sending a laser beam for polarization splitting to obtain a first polarized light and a second polarized light; Loading a preset phase map in the spatial light modulator, and injecting the first polarized light into the spatial light modulator; controlling the spatial light modulator to perform light modulation to obtain modulated light; The second polarized light and the modulated light are injected into the quarter-wave plate and the polarization group, and the direction of the optical axis of the quarter-wave plate and the transmission axis of the polarizer in the polarization group are adjusted direction; Controlling the adjusted quarter-wave plate and the polarization group to perform polarization interference on the input light, and collecting the optical signal of the output light after the interference to obtain a plurality of interference fringe patterns; Phase recovery is performed on the interference fringe pattern to obtain a phase recovery diagram, and the interference fringe pattern and the phase recovery diagram are stored to obtain a phase information training set. 2. The method for generating a phase information training set according to claim 1, wherein the injecting the second polarized light and the modulated light into a quarter-wave plate and a polarization group comprises: inputting the modulated light into an imaging lens for imaging, and combining the modulated light and the second polarized light transmitted by the imaging lens to obtain a combined beam; The combined beam is input to the quarter wave plate and the polarization group. 3. The method for generating a phase information training set according to claim 2, wherein the inputting the combined beam into the quarter-wave plate and the polarization group comprises: The combined beam is input into the quarter-wave plate, and the angle between the fast axis direction of the quarter-wave plate and the two linearly polarized lights in the combined beam is adjusted to 45° °; The two linearly polarized lights in the combined beams are controlled to become circularly polarized lights after passing through the quarter-wave plate. 4. The method for generating a phase information training set according to claim 1, wherein the polarization group comprises four polarizers, and the light transmission axis directions of the four polarizers are corresponding to the horizontal axis at 0°, 45°, 90° and 135°, so that the interference fringe patterns obtained after polarization interference are 0 phase shift fringe patterns, π/2 phase shift fringe patterns, π phase shift fringe patterns and π3/2 phase shift fringe patterns. 5. The method for generating a phase information training set according to claim 4, wherein the storing the interference fringe diagram and the phase recovery diagram to obtain a phase information training set, comprising: The 0-phase shift fringe pattern and all the phase recovery patterns are stored correspondingly to obtain the phase information training set. 6. The method for generating a phase information training set according to claim 1, wherein the injecting the first polarized light into the spatial light modulator comprises: The first polarized light and the second polarized light are respectively subjected to beam expansion and collimation processing, and the processed first polarized light is injected into the spatial light modulator. 7. The method for generating a phase information training set according to claim 1, wherein the emitting laser beam for polarization splitting comprises: Controlling the laser to emit the laser beam, and inputting the laser beam into a filter for filtering; inputting the filtered laser beam into a half-wave plate, and injecting the laser beam after being transmitted by the half-wave plate into a polarization beam splitter; The polarizing beam splitter is controlled to split the emitted laser beam. 8. An apparatus for generating a phase information training set, comprising: The polarization beam splitting module is used for emitting a laser beam for polarization splitting to obtain the first polarized light and the second polarized light; a light modulation module, configured to load a preset phase map in the spatial light modulator, inject the first polarized light into the spatial light modulator, and control the spatial light modulator to perform light modulation to obtain modulated light; an optical axis adjustment module for injecting the second polarized light and the modulated light into a quarter-wave plate and a polarization group, and adjusting the direction of the optical axis of the quarter-wave plate and the polarization group The direction of the transmission axis of the middle polarizer; a polarization interference module, used for controlling the adjusted quarter-wave plate and the polarization group to perform polarization interference on the input light, and collecting the optical signal of the output light after the interference to obtain multiple interference fringe patterns; The training set storage module is used for performing phase recovery on the interference fringe pattern to obtain a phase recovery picture, and storing the interference fringe pattern and the phase recovery picture to obtain a phase information training set. 9. A terminal device, comprising a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor implements the computer program as claimed in the claims when executing the computer program The method of any one of 1 to 7. 10 . A storage medium storing a computer program, wherein the computer program implements the method according to any one of claims 1 to 7 when the computer program is executed by a processor. 11 .

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