221 results about "Single exposure" patented technology

The invention provides a chip bonding wire three-dimensional measurement method and system based on an inner cavity reflection camera system, and relates to the technical field of three-dimensional measurement. The method comprises the following steps: performing one-time exposure imaging on a chip bonding wire to be detected through an inner cavity reflection camera system to obtain at least three mutually independent visual angle images in the same frame; performing brightness normalization compensation and geometric calibration on the visual angle image to obtain a visual angle data set with uniform brightness and correlation; pairing the view angle data sets in pairs, extracting parallax information by using a feature matching algorithm based on optical flow, and fusing multiple pairs of parallax to generate a lead three-dimensional point cloud; performing noise filtering and curved surface reconstruction on the three-dimensional point cloud to obtain a continuous three-dimensional grid model of a lead; and performing texture mapping on the three-dimensional grid model by adopting any visual angle in the visual angle image or the combination of the visual angles, and outputting a lead three-dimensional reconstruction result with textures. According to the invention, high-precision, large-depth-of-field and rapid three-dimensional measurement of the chip bonding wire is realized.

The invention discloses a snapshot type hyperspectral imaging industrial online sorting system which comprises a support assembly, an optical imaging assembly and a motion control assembly. The bracket assembly consists of a bottom plate, and an adjustable bracket and a fixed bracket which are fixed on the bottom plate; the optical imaging assembly comprises a lighting unit, an imaging objective lens and a snapshot type hyperspectral camera, and can synchronously obtain space image information of a measured object and spectral information of a continuous wave band in a single exposure process; the motion control assembly realizes automatic transmission of the measured object through the transmission platform; the data processing module is integrated with an image preprocessing unit, a spectral analysis unit and a spectral database, and is used for end-to-end closed-loop control from original hyperspectral data generation to sorting decision making; the system adopts a metasurface light splitting structure to realize real-time decoding, performs material or category identification by using a pre-trained classification model, and finally automatically generates a sorting decision signal according to an identification result to drive a motion control assembly to complete sorting operation.

An ophthalmic imaging system provides an automatic focus mechanism based on the difference of consecutive scan lines. The system also provides of user selection of a focus point within a fundus image. A neural network automatically identifies the optic nerve head in an FA or ICGA image, which may be used to determine fixation angle. The system also provides additional scan tables for multiple imaging modalities to accommodate photophobia patients and multi-spectrum imaging options.

The invention discloses a phase recovery method based on non-interference coding aperture holography, and belongs to the field of computational optical imaging. According to the technology, phase information of an object is directly extracted from a single hologram through a physically-driven numerical optimization framework in combination with Wiener inverse filtering and an improved G-S (Gerchberg-Saxton) algorithm. A frequency domain inverse filter is constructed based on system modeling of a point diffusion hologram, noise interference is effectively suppressed, meanwhile, a historical gradient acceleration strategy is provided, a convergence path is optimized by dynamically adjusting an iteration step length, and the calculation efficiency is improved. The technology has the core advantages that the limitation of a traditional interference light path is broken through, precise optical alignment or multi-time out-of-focus surface data acquisition is not needed, the system architecture is simplified, the environmental adaptability is enhanced, and quantitative phase distribution reconstruction of transparent and weak scattering samples can be realized through single exposure.

The invention discloses an intermediate infrared polarization spectrum imaging method and device. The method comprises the following steps: carrying out joint coding on an intermediate infrared light beam carrying to-be-measured target space, spectrum and polarization information by adopting an intermediate infrared polarization spectrum modulator consisting of metasurface units which are arranged in an array and have non-correlation response characteristics; projecting the coding light field to a two-dimensional detector array to generate a two-dimensional coding image under single exposure; and decoding the two-dimensional coding image through a reconstruction unit so as to reconstruct and obtain a space-spectrum-polarization four-dimensional data cube of the target to be measured. The problem that polarization information cannot be rapidly obtained in the prior art is solved, target full information can be obtained under single exposure, and the system has the advantages of being high in imaging speed, simple in structure, easy to miniaturize and the like.

The present disclosure provides a method, apparatus, medium and device for calculating the wafer layout of a wafer, belonging to the field of semiconductor technology. The method includes: based on the distribution array of each wafer, taking any wafer as a reference wafer, moving the wafer center in a preset area according to a first step length to determine the first coverage area after each movement, and determining the feasible area of the reference wafer according to the number of complete wafers in the coverage area; moving the wafer center in the feasible area according to a second step length to determine the second coverage area after each movement, and determining the maximum number of complete wafers in the coverage area; placing the reference wafer at different positions in the single-exposure area in turn according to the wafer position distribution pattern of the single-exposure area of the lithography machine to determine the minimum number of exposures for exposing all wafers; determining the positions of each wafer according to the maximum number and the minimum number of exposures to generate a wafer layout. The present disclosure can improve the accuracy and efficiency of calculating the maximum number of wafers.

The invention discloses a pipeline inner wall panoramic three-dimensional scanning device and a measuring method, and the device comprises a panoramic plane laser generator which comprises a point laser generator, an axicon, a laser focusing lens, a conical surface reflector and a transparent cylindrical support, and is used for transmitting a 360-degree panoramic plane laser beam to the inner wall of an object to be measured; according to the invention, single-exposure full-circumferential high-precision three-dimensional measurement is realized, and the device can synchronously obtain complete three-dimensional point cloud data of the circumference of the inner wall of the whole pipeline at the moment of single exposure through innovative combination of a panoramic annular imaging system and a panoramic planar laser projection technology; the method has the advantages that axial rotary scanning or multi-view data splicing required by a traditional method is avoided, measurement efficiency is improved, splicing accumulative errors are avoided, laser stripe image acquisition is complete and free of breakpoints, and completeness and accuracy of three-dimensional reconstruction data are guaranteed from the source.

The invention discloses an image acquisition method and device, equipment, a storage medium and a program product, and relates to the technical field of image acquisition. The method is used for an image acquisition device, and the image acquisition device comprises a light supplement lamp, a master camera, a slave camera and a controller. The method comprises the following steps: the controller sends a first exposure control signal to the main camera; under the condition that the first exposure control signal is received, the main camera performs periodic exposure; under the condition that single exposure is completed, the master camera sends a frame synchronization signal to the slave camera; under the condition that the frame synchronization signal is received, the slave camera performs exposure; the controller controls the light supplementing lamp to perform periodic light supplementing based on the exposure time of the camera, and the light supplementing time period of the light supplementing lamp covers the exposure time period of the camera; and the master camera and the slave camera transmit acquired image data to the controller.

The invention relates to the technical field of photoelectric detection, and particularly discloses a three-dimensional defect detection method and system based on compound color stripe projection, and the method comprises an upper computer control and processing module which is used for generating a compound color stripe pattern coded with phase difference information, and coordinating and controlling the synchronous operation of the whole system; the structured light projection module is used for receiving the composite color stripe pattern and projecting the composite color stripe pattern to the surface of a measured object at one time; the imaging module is used for receiving the composite colored light reflected after being modulated by the surface of the measured object and separating the composite colored light into monochromatic light signals with different colors for synchronous acquisition; the imaging module further comprises an active highlight suppression unit which is used for dynamically adjusting the polarization direction according to an instruction of the upper computer control and processing module so as to suppress highlight caused by specular reflection. Multiple groups of sine fringes with fixed phase differences are projected to the surface of a measured object at one time. And a plurality of deformed fringe patterns with phase displacement can be synchronously acquired under single exposure.

The invention discloses an all-solid-state snapshot full-Stokes parameter measurement and imaging enhancement sensor device. The all-solid-state snapshot full-Stokes parameter measurement and imaging enhancement sensor device comprises a micro-lens array module, a liquid crystal phase modulation module, a polarization wire grating array module and an image sensor module. The micro lens array module is composed of a plurality of micro lenses which are arranged in a two-dimensional mode, and incident light is focused on the photodiode of each pixel. The liquid crystal phase modulation module is composed of two high-speed liquid crystal variable phase delayers, and active phase modulation is carried out on the polarization state of incident light. Polarized light information in four polarization directions can be obtained only through single shooting in the polarization wire grating array module. The image sensor module calculates the full Stokes parametric polarization characteristics of the incident light. According to the invention, full-polarization information measurement of incident light can be realized only through single exposure, and a polarization enhancement mode is switched after measurement is completed, so that the imaging efficiency of the sensor in dark light scenes such as weak contrast target detection is greatly improved.

The invention discloses a monocular four-dimensional imaging device and method based on a metasurface. The monocular four-dimensional imaging device comprises an image sensor and an imaging optical system arranged in front of the image sensor. Wherein the imaging optical system comprises a metasurface, the metasurface is designed to simultaneously generate a self-acceleration Airy point spread function with depth-dependent lateral displacement for incident left-hand circularly polarized light and right-hand circularly polarized light, and the self-acceleration Airy point spread function can generate a self-acceleration Airy point spread function with depth-dependent lateral displacement under the condition that a mechanical moving part is not used. Carrying out polarization separation and focusing on the left-hand circularly polarized light and the right-hand circularly polarized light; the image sensor is used for recording a mixed image containing the left-hand circularly polarized light information and the right-hand circularly polarized light information at the same time through single exposure so as to obtain three-dimensional depth and polarization information of the metasurface, namely monocular four-dimensional imaging of the metasurface. The scene perception and understanding capability of a machine is greatly enhanced, and the method has unique advantages in the aspects of target identification, material discrimination, severe environment perception and the like.

The invention discloses a differential compression structured light illumination super-resolution imaging device based on time sequence multiplexing. The differential compression structured light illumination super-resolution imaging device is composed of a light source and beam expanding system, a structured light illumination imaging system, a coding aperture time domain compression imaging system, a time sequence control system and a data processing reconstruction system. According to the invention, the two digital micromirror devices are controlled through a time sequence, and wide-field and structured light compression imaging is realized respectively. In the wide-field mode, the two digital micromirror devices are switched to the total transmission mode, and fluorescence signals of the excitation sample are directly collected by the camera; in a structured light mode, the first digital micro-mirror device generates six time-varying stripe coding patterns, and dynamic space coding of the second digital micro-mirror device is combined, so that a camera obtains a compressed image through single exposure. Through differential processing of a wide field and a compressed image, background noise is suppressed, high-frequency information weight is enhanced, the bottleneck of high-frequency signal offset in traditional compressed imaging is broken through, image reconstruction quality is remarkably improved, and high-fidelity imaging of a high-speed dynamic scene is realized.

The invention discloses a surface topography measurement device and method based on polarization phase shift. The device comprises a laser module, a polarization beam splitting and interference module, a polarization beam combining and imaging module, a polarization image acquisition module and a control and reconstruction module. The laser module comprises a monochromatic tunable laser, an optical fiber collimating amplifier and a polarizer; the polarization beam splitting and interference module comprises a polarization beam splitting prism, a first quarter-wave plate, a plane mirror and a second quarter-wave plate; the polarization beam combining and imaging module comprises a polarization splitting prism, a third quarter-wave plate and a telecentric lens; the polarization image acquisition module comprises a micro-polarization array camera and an image processing unit, and the micro-polarization array camera synchronously acquires four polarization interference images through single exposure; and the control and reconstruction module obtains measurement data of the surface topography of the to-be-measured object through a phase unwrapping algorithm and three-dimensional topography reconstruction. According to the invention, high-precision, large-field-of-view, portable and high-efficiency field detection can be realized.

The invention relates to a metal workpiece surface image acquisition method and device based on multiple exposure. The acquisition method comprises the following steps: determining total exposure, and determining single exposure time and corresponding weight according to the total exposure; acquiring a surface image of the metal workpiece at each exposure time, and adjusting the surface image by using the corresponding weight; and combining a plurality of adjusted images to obtain a metal workpiece surface reflection-removed image. According to the method, a strategy of multiple times of irregular exposure is adopted, multiple times of short-time exposure is used for replacing one time of long-time exposure, a strong single light reflection area is avoided, light reflection is reduced, meanwhile, more image details are reserved, and the final image quality is improved.

The invention provides a photogrammetry control method and device based on a laser galvanometer and electronic equipment, and belongs to the technical field of photogrammetry, and the method comprises the steps: controlling the laser galvanometer to deflect according to a preset scanning path in a single exposure period of a camera, so as to form n laser gratings in a single frame image collected by the camera; extracting feature information of each laser grating from the single-frame image, wherein the feature information comprises pixel coordinates in a space coordinate system; and calculating three-dimensional coordinate points of the surface of the object to be measured according to the real-time deflection angles of the laser galvanometer when the laser galvanometer projects the laser gratings, the feature information of the laser gratings and pre-calibrated camera parameters, and summarizing to generate three-dimensional point cloud data. According to the invention, the precision of photogrammetry is improved.

The invention discloses a spectral space coding imaging system and method of a programmable diffractive optical element. The method comprises the following steps: S10, receiving a target scene light signal through a light field model and forming an optical image; s20, performing spatial spectrum joint modulation on the optical image by adopting a programmable diffractive optical element to obtain a coded light field; s30, projecting the coding light field to a detector and obtaining a two-dimensional coding image of primary exposure; and S40, inputting the two-dimensional coding image into a reconstruction module, combining modulation information of the programmable diffractive optical element, and performing decoding reconstruction by using a compressed sensing algorithm to obtain a high-resolution space image and spectral information of the scene. According to the invention, the limitation of the existing system on spatial / spectral resolution is broken through, the system structure is simplified, and the hardware programmability is improved; the imaging capability in a dynamic scene is improved; the signal-to-noise ratio and the penetrating power are improved; and balancing a physical model and a data driving method.

The invention discloses an ultrafast coherent modulation imaging device based on chirped pulse illumination, which can collect evolution information of intensity and phase along with time change in an ultrafast dynamic scene under the condition of single exposure. The device encodes an ultrafast scene by using the spectrum-time mapping characteristic of chirped pulses, realizes phase encoding through random phase modulation, then acquires an encoded diffraction pattern through a snapshot hyperspectral camera, and finally recovers space-time complex amplitude information of the ultrafast dynamic scene through a phase retrieval algorithm. The invention provides an imaging device capable of obtaining dozens of ultrafast time resolution complex amplitude images in single exposure, and the imaging dimension and the time resolution capability are remarkably improved. The device and method provided by the invention provide a new technical path for researching the ultrafast dynamic process, and have certain scientific research application potential and engineering popularization value.

According to the mid-infrared multispectral integrated imaging device system and method based on the metasurface, superatom phase distribution is designed through dispersion engineering, accurate matching is conducted through a particle swarm optimization algorithm, incident light of different wavelengths generates transverse dispersion on a focal plane, full-wave-band spectral imaging can be completed through single exposure, and a mechanical scanning device is not needed. The quadruple rotational symmetry structure of the metasurface ensures the consistent response to TE / TM polarized light, and significantly improves the adaptability of the system in a complex polarization environment. The average energy utilization rate of the metasurface exceeds 50%, the highest isolation degree of each pixel is 48, and the metasurface has the characteristics of high signal-to-noise ratio and low crosstalk. Compared with a traditional spectral imaging device, the spectral imaging device has the advantages of being high in speed, high in energy utilization rate, small in size, low in crosstalk and the like, is suitable for application scenes such as medical endoscopy, industrial online detection and unmanned aerial vehicle environment monitoring which have high requirements for real-time performance and portability, and provides an innovative solution for achieving a miniaturized spectral imaging system.

The invention discloses a wide-spectrum high-resolution hyperspectral video imaging method and device, and the method comprises the steps: carrying out the feature extraction of a plurality of wide-spectrum aliasing wide-spectrum hyperspectral video frames captured by a wide-spectrum hyperspectral sensor in single exposure imaging, and obtaining a hyperspectral output feature; the method comprises the following steps: extracting features for panchromatic video frames of the same scene captured by a panchromatic sensor to obtain panchromatic output features, splicing wide-band spectrum hyperspectral video frames and the panchromatic video frames, and extracting features to obtain space-spectrum features; fusing the hyperspectral output feature, the panchromatic output feature and the space-spectral feature to obtain a final coding feature; the encoded features are decoded to obtain a high resolution hyperspectral video frame. The method aims at recovering spectral information of more wavebands from aliasing spectrums, the problems of spectral aliasing and the like are solved through fusion imaging, and high-resolution hyperspectral videos are obtained.

The invention belongs to the technical field of astronomy, and provides a multi-channel synchronous polarization imager system which is used for a night astronomy observation scene. According to the system, through cooperative work of key components such as a relay optical system, a polarization calibration unit rotating wheel, a broadband optical filter, a zero polarization splitting prism, a super achromatic half-wave plate and a polarization splitting prism, celestial body polarization state synchronous measurement in a full view field is completed through one-time exposure. Wherein the relay optical system is responsible for collimation and imaging functions; the polarization calibration unit rotating wheel is used for polarization calibration; the zero-polarization splitting prism divides an incident light beam into a transmission light beam and a reflection light beam; the super achromatic half-wave plate and the polarization splitting prism are used for polarization modulation. The system solves the problem of dispersion effect during broadband measurement, improves the detection capability of a dark and weak target, and is suitable for high-precision synchronous polarization measurement of a large field of view.

The present invention discloses a fast structured light digital holographic measurement system and method, which relates to the field of micro-nano detection technology; in the present invention, structured light after polarization modulation is used to irradiate an object to be measured and then becomes object light. The object light and the reference light are combined and incident on a polarization beam splitter element. After passing through the polarization beam splitter element, multiple structured light digital holograms are formed. The structured light digital holograms are collected by a photodetector, and the photodetector can achieve synchronous collection of two structured light holograms with fixed phase shifts in a single exposure; the measurement method of the present invention introduces spatial phase shift during the measurement process, eliminates the time phase shift step, doubles the overall collection efficiency, and improves the real-time performance of the measurement.

The invention discloses a micro-lens array non-scanning type laser interference three-dimensional imaging method and device for a dynamic sample, and relates to the technical field of optical three-dimensional measurement and imaging, and the method comprises the steps: dividing laser into object light and reference light; irradiating a dynamic sample arranged at the focal plane of the micro-lens array with the object light after beam expansion, modulating the object light carrying sample information by the micro-lens array, and combining the modulated object light with the reference light in space to generate a composite interference field containing a plurality of sub-region interference patterns; recording a single-frame composite interferogram by an area array detector; and finally, reconstructing the three-dimensional morphology of the sample at the measurement moment through a phase extraction and unwrapping algorithm. By means of the mode, full-view-field three-dimensional information can be obtained through single exposure by means of the microlens array, mechanical scanning or multi-frame phase shifting is not needed, the problem of motion artifacts generated when a dynamic sample is measured through a traditional interference method is effectively solved, and high-speed and high-resolution three-dimensional imaging of the surface appearance of the dynamically-changed sample is achieved.

The invention discloses a camera time sequence control method, electronic equipment and a driver monitoring system, and relates to the technical field of artificial intelligence. The method is suitable for a camera of an image sensor, and the exposure starting time of photosensitive pixels in all rows or columns of the camera is sequentially staggered, and according to the single exposure duration, the effective imaging time and the periodic time sequence interval of the image sensor, the exposure starting time of the photosensitive pixels in all rows or columns is calculated. Under the condition that the total energy of infrared radiation received by each exposure pixel is the same, determining the light-emitting duration of the light-supplementing light source; according to the effective imaging time, the frame blanking time and the light-emitting duration, determining a light-emitting starting moment under the condition that the starting position of a light-emitting signal of the current frame image is located at the last time slice before the end of the previous frame image; and generating a control signal corresponding to the light supplementing light source according to the light emitting starting time and the light emitting duration. According to the invention, the problems of high cost and large image noise in related technologies can be solved, the cost can be effectively reduced, and the image effect can be optimized.

The application provides a method for obtaining a multispectral image through single exposure, an endoscope system and electronic equipment. The method comprises the following steps: obtaining an original image within a single exposure time, wherein the original image is obtained by sequentially imaging a light signal on a main light path of the endoscope system through a lens array and a continuous variable filter; dividing the original image into a plurality of sub-images corresponding to different channels in the lens array, wherein different sub-images correspond to different wave bands and different channel response coefficients; and performing normalization correction on the corresponding sub-images according to the wave bands and the channel response coefficients, so as to eliminate the response difference between different channels and obtain a sequence image of multiple wave bands. Through multiple parallel channels, a plurality of sub-images with different spectral responses are obtained within a single exposure, and the rapid acquisition of multispectral information of an endoscope is realized.

This invention discloses a flow field measurement method and system based on structured light coding and dual-view optical field imaging. The method includes calibrating the resolution and point spread function of the imaging system to generate orthogonal structured light fringes; constructing an excitation optical path to generate three orthogonal structured lights of different colors with a phase difference of 120°; acquiring the three phase structured light fringes within a single camera exposure time; constructing an experimental optical path for dual-view optical field imaging and reconstructing the optical field from the imaging results under the illumination of the three different phase structured lights; performing structured light super-resolution reconstruction on the optical field images under dual-view to obtain super-resolution images of particles in the Y and Z directions; superimposing the dual-view images of the super-resolution images to obtain a super-resolution three-dimensional particle distribution image; performing cross-correlation calculation on the super-resolution three-dimensional particle distribution image and post-processing the three-dimensional velocity vector field of the flow field.

The present application relates to the technical field of image collection. Disclosed are an image collection method, apparatus and device, and a storage medium and a program product. The method is applied to an image collection device, wherein the image collection device comprises a fill light lamp, a master camera, a slave camera and a controller. The method comprises: a controller sending a first exposure control signal to a master camera; when the first exposure control signal is received, the master camera performing exposure periodically; when single exposure is completed, the master camera sending a frame synchronization signal to a slave camera; when the frame synchronization signal is received, the slave camera performing exposure; on the basis of exposure moments of the master camera and the slave camera, the controller controlling a fill light lamp to fill light periodically, wherein a fill light time period of the fill light lamp covers exposure time periods of the master camera and the slave camera; and the master camera and the slave camera transmitting collected image data to the controller.

The embodiment of the invention relates to the technical field of image processing, in particular to an image fusion method, a chip, electronic equipment and a storage medium. The method comprises the following steps: in response to a shooting operation, acquiring a first raw image and a second raw image by a camera of the electronic equipment; the first raw image and the second raw image are acquired by the camera through one exposure process. That is to say, the camera can obtain the first raw image and the second raw image through a single-exposure multiple-reading mode. Next, the electronic device calculates an image light ratio through the pixel values of the pixel points of the first raw image and the pixel values of the pixel points of the second raw image. And the electronic device performs image fusion on the first raw image and the second raw image according to the image light ratio to obtain a fused raw image. Then, the electronic device displays the fused raw image. Through the method, the signal-to-noise ratio of the obtained fused image can be improved.

The invention discloses a multi-exposure offset method for improving PCB ink color difference and a medium. The multi-exposure offset method comprises the following steps: preparing a PCB substrate coated with ink; determining the power ratio of a plurality of lasers in the laser direct imaging equipment; an exposure parameter set corresponding to the multiple exposure modes is established, the exposure parameter set at least comprises an exposure dose parameter and an exposure starting point offset parameter, and the total exposure dose of the multiple exposure modes is equivalent to the single exposure dose required for improving the chromatic aberration target; based on the exposure parameter set, the laser direct imaging equipment is controlled to execute at least two times of exposure operation on the same target pattern area on the PCB substrate, and the starting point positions of the exposure operation are different from one another. According to the invention, multiple exposure is carried out by setting different starting points for the same pattern area, so that the light path energy is dispersed and homogenized, the chromatic aberration in PCB ink exposure is efficiently compensated, and the product yield is improved.

The invention discloses a portable Raman spectrometer based on Hadamard transform. The portable Raman spectrometer comprises a light source module, a sample bin, an optical system module, a detection module, a signal processing module and a control unit, the light source module is used for generating an excitation light beam to induce a target sample to generate Raman scattering light; an optical signal acquisition path is reconstructed through a space-spectrum cooperative coding mechanism of a Hadamard coding disc, multi-channel parallel capture in a full-spectrum range is realized in single exposure, and the luminous flux limitation of a traditional light splitting technology is fundamentally broken through; in combination with a dual optimization mechanism of dynamic weighting calculation, a closed-loop iteration model of noise suppression and weak signal enhancement is initiated, and signal-noise separation and fidelity reconstruction are realized on an algorithm level through real-time environmental noise analysis and Raman intensity gradient self-adaption.

The invention discloses a single frequency domain holographic ultrafast imaging system and method based on two-step phase shift. The ultrafast imaging system comprises a light source part used for generating linearly polarized femtosecond laser pulses; the chirp laser pulse part is connected with the light source part and is used for broadening the femtosecond laser pulse into a chirp laser pulse; the single two-step phase shift part is connected with the chirp laser pulse part and is used for splitting the chirp laser pulse into reference light and signal light and generating two groups of phase shift interferograms with fixed phase difference based on the reference light and the signal light; wherein the two groups of phase shift interferograms are generated at the same time under single exposure; and the spectral imaging part is connected with the single two-step phase shift part, and is used for recording the two groups of phase shift interferograms at the same time, and reconstructing the phase information of the sample through a preset phase reconstruction algorithm. Therefore, through optical system design, two groups of phase shift interferograms are simultaneously obtained through single exposure, time delay and phase errors caused by traditional step-by-step acquisition are avoided, and the method is suitable for observation of a femtosecond ultrafast dynamic process.