73 results about "Moiré pattern" patented technology

The embodiment of the invention provides a model training method and a focusing processing method, and relates to the technical field of terminals. The method includes training a focus model using moire-enhanced image data, and applying the model in a focus processing flow. When a user uses a terminal to shoot an electronic screen and moire patterns appear in an image, so that a traditional automatic focusing method is limited, the phase difference can be obtained through model reasoning, or the phase difference can be obtained based on laser ranging. Therefore, according to the obtained phase difference, the horse is adjusted to reach the corresponding position, focusing is achieved, picture focusing jitter in the terminal is avoided, and a user can shoot a clear image.

The invention relates to the technical field of intelligent design of optical lenses, and discloses a multi-series superposed complex periodic structure arrangement method and system.The method comprises the steps of normalized coordinate transformation, multiple sine wave superposition, an iterative function system, a Julia set algorithm, an LSystem grammar system, parameter adjustment, moire fringe fusion and the like; and a complex periodic structure with high complexity, adaptability resistance and natural morphological characteristics is generated. Advanced technologies such as logarithm uniform distribution wave number generation, a chaos game algorithm, linear mapping complex number conversion, a turn graph interpreter, multi-scale entropy complexity quantification and an Otsu automatic threshold method are adopted, and accurate parameterization control and manufacturing adaptation are achieved. The system comprises a coordinate transformation module, a wave interference calculation module, a fractal generation module, a complex power system module, an LSystem processing module, a parameter control module and a contour surface extraction module. According to the invention, a systematic solution can be provided for complex structure design of optical devices such as myopia prevention and control lenses.

Provided is an optical film requirement that does not use fine particles for light diffusion, is entirely composed of a transparent resin, and has a self-moire pattern that cannot be visually recognized by the naked eye, said optical film requirement having high front brightness without luminance unevenness on the light emission surface of a backlight when mounted on an edge-light backlight. A light-collecting auxiliary film inserted between the light emission surface of a light guide plate and the light incidence surface of a brightness enhancement film (BEF) in an edge-light backlight unit using discrete LED point light sources, the light-collecting auxiliary film being characterized by comprising: an optical waveguide layer comprising a light-transmitting base film, and a light-collecting layer comprising a light-transmitting base film, the light-collecting auxiliary film being interposed between the light emission surface of the light guide plate and the light incidence surface of the brightness enhancement film (BEF), the light-collecting auxiliary film being interposed between the light-emitting surface of the light guide plate and the light incidence surface of the brightness enhancement film (BEF); a light extraction layer that is formed on one surface of the optical waveguide layer and has a plurality of inverted rectangular pyramid-shaped unit recesses; and a light introduction layer formed on the other surface of the optical waveguide layer and having a plurality of unit triangular prisms extending in parallel in one direction, the light extraction layer constituting a light emission surface, and prism surfaces of the plurality of unit triangular prisms constituting the light introduction layer constituting a light incidence surface. The direction of the ridge lines of the plurality of unit recesses and the direction of the ridge lines of the plurality of unit triangular prisms intersect at an angle of 42 DEG to 48 DEG, and the light extraction layer, the optical waveguide layer, and the light introduction layer do not contain fine particles for light diffusion. The self-moire pattern generated by the plurality of unit recesses and the plurality of unit triangular prism lenses cannot be visually recognized by naked eyes.

The invention relates to the technical field of optical measurement, in particular to an optical measurement system and a measurement method thereof.The optical measurement system comprises a light source, a projection assembly, an imaging assembly and a receiving assembly, the projection assembly modulates light beams emitted by the light source through an optical mask, generates detection light carrying geometric patterns and projects the detection light to the surface of a sample to be measured; the detection light forms return light comprising reflected light and diffracted light on the surface of the to-be-detected sample, and the diffracted light is formed by diffraction of the detection light through a physical structure on the surface of the to-be-detected sample; the imaging assembly generates signal light carrying moire fringe information and diffracted light information by superposing the return light through a reference pattern structure; the receiving assembly comprises a filtering structure and a receiving module, diffraction light of the signal light is filtered out through the filtering structure to form target signal light, and the receiving module obtains defocus data based on the target signal light. According to the invention, diffracted light in signal light can be effectively filtered out, optical interference is avoided, and the accuracy of automatic focusing is improved.

A personalizable security document including a combination of two secure features, namely, a laser-engravable material embedded in a substrate of the security document and an embossed pattern formed in an outer surface of the substrate and overlapping the laser-engravable material. The combination of the laser-engravable material and the embossed pattern may result in a change in appearance of the embossed pattern when the security document is viewed at different observation angles. Security can be further enhanced by providing a watermark below the laser-engravable material. Further, by providing appropriate structures in the embossed pattern and the laser-engravable material, a personalized security document exhibiting a moiré effect can be obtained.

This utility model discloses an anti-glare glass and an electronic device. The anti-glare glass includes: at least one anti-glare surface; a groove array formed by multiple irregularly arranged grooves on the anti-glare surface; all grooves in the groove array have the same diameter, and the center distance between adjacent grooves is not exactly the same, and adjacent grooves share the same edge; the diameter of the grooves ranges from 15 to 150 μm, and the difference between the maximum and minimum diameter of the grooves is 3 to 70 μm; the depth of the grooves is the same; and the center distance between adjacent grooves is 15 to 120 μm. While possessing high anti-glare performance, it also eliminates flash points, moiré patterns, and rainbow patterns.

The invention relates to the field of optical display and material engineering, in particular to an optical film with a 3D light splitting function and a manufacturing method of the optical film. An optical film with a 3D light splitting function comprises a transparent optical base material and a microstructure layer integrally formed with the surface of the transparent optical base material, the microstructure layer comprises a cylindrical lens grating layer and a parallax barrier layer, and the cylindrical lens grating layer is integrally formed on the surface of the transparent optical base material. The cylindrical lens grating layer is of a micro-nano structure formed by a nano-scale grating and a micron-scale cylindrical micro-lens array; the parallax barrier layer is located on the side, away from the transparent optical base material, of the cylindrical lens grating layer. The optical film has excellent optical efficiency, wider visual angle, excellent brightness uniformity and excellent moire inhibition capability, has 2D / 3D switching, peep-proof and other functions, can adapt to light requirements of different scenes, can serve as a core display optical element to be directly integrated in various display devices, and has wide application prospects. And the application limitation of an externally-pasted protective film is broken.

This invention belongs to the field of optical film technology, specifically high-definition optical composite coating films and their preparation methods. This invention aims to solve the problem that existing optical composite films cannot simultaneously achieve both optical enhancement and viewing angle. This invention involves mixing a nano-conductive polymer, a silicone additive, and a diffusion liquid to obtain a diffusion layer coating liquid; dispersing PMMA-PS microspheres in the diffusion layer coating liquid to obtain a composite coating liquid; mixing a prism layer resin and nano-silica to obtain a prism layer coating liquid; coating the back of a PET substrate with the composite coating liquid and passing it through a microlens array to obtain a diffusion layer; coating the front of the substrate with the prism layer coating liquid to obtain a prism layer; and finally, after curing, attaching a PE protective film to one side of the prism layer to obtain the composite coating film product. The composite coating film prepared by this invention has excellent optical enhancement, a good viewing angle, and effectively suppresses moiré patterns.

The invention discloses an ultra-high-definition image moire removal method based on cross-band adaptive fusion and a terminal, which are applied to camera equipment in a camera shooting screen scene, and the method comprises the following steps: obtaining paired ultra-high-definition images polluted by moire and a moire-free ultra-high-definition image data set in different scenes; randomly dividing the data set into a training set and a test set, and preprocessing an ultra-high-definition image polluted by moire and an ultra-high-definition image without moire; training an ultra-high-definition image moire removal model based on cross-band adaptive fusion through the training set data to obtain a trained ultra-high-definition image moire removal model based on cross-band adaptive fusion; and inputting test set data into the trained ultra-high-definition image moire removal model based on the cross-band adaptive fusion to obtain an ultra-high-definition image after moire removal. According to the method, the complex moire patterns in the ultra-high-definition image can be effectively modeled, so that the clear image is recovered.

This application discloses a display panel and a display device for mitigating moiré patterns. The display panel includes: a display substrate and a touch conductive layer; the display substrate includes: a plurality of sub-pixel groups; the sub-pixel groups include: a plurality of sub-pixel opening regions arranged along a first direction, and non-opening regions; the touch conductive layer includes: a plurality of touch electrodes; the touch electrodes include: a plurality of hollowed-out regions arranged in an array, and non-hollowed-out regions located between the hollowed-out regions; the orthographic projections of the hollowed-out regions and the non-hollowed-out regions on the display substrate overlap with the sub-pixel groups; the hollowed-out regions include strip-shaped hollowed-out regions; the maximum width of the same sub-pixel opening regions located in different sub-pixel groups is not completely the same in the first direction, and / or, for regions corresponding to different sub-pixel groups, at least one of the following is not completely the same: the width of the hollowed-out region in the first direction, the width of the non-hollowed-out region between two adjacent hollowed-out regions in the first direction, and the angle between the extension direction of the strip-shaped hollowed-out region and the first direction.

A mask manufacturing method, an anti-glare mask, and a manufacturing method for an anti-glare product. The mask manufacturing method comprises: generating a base scatter plot having random characteristics; on the basis of the base scatter plot, drawing a Voronoi diagram; and clipping a pattern from the Voronoi diagram, and performing two instances of mirroring, edge trimming and arraying on the pattern, in order to obtain an anti-glare mask. The anti-glare mask is manufactured using the mask manufacturing method. The manufacturing method for an anti-glare product comprises steps such as coating, exposure, development, etching, and stripping. A base scatter plot having random characteristics is used to draw a Voronoi diagram, and steps such as pattern clipping, mirroring, edge trimming and arraying are then performed, such that an ultimately obtained anti-glare mask has an anti-glare effect. The manufacturing method avoids optical defects such as Moire patterns and reflected bright lines, so that the mask manufacturing precision is improved, and patterns on masks are also more uniform and delicate, thereby improving the quality and performance of the masks.

A display device (300) and a manufacturing method therefor, and an electronic product. In the display device (300), a display panel (100) comprises: a plurality of pixel units (110) arranged in an array, wherein the plurality of pixel units (110) are divided into a plurality of pixel islands (120) arranged in an array in a third direction (D3) and a second direction (D2), each pixel island (120) comprises M pixel unit rows (131), and each pixel unit row (131) comprises N pixel units (110) arranged in the third direction (D3). A light-splitting assembly (200) comprises a plurality of light-splitting units (210), wherein each light-splitting unit (210) comprises P light-splitting structures (220), each light-splitting structure (220) extends in the third direction (D3), the size of each light-splitting unit (210) in the second direction (D2) is equal to the width of each pixel island (120) in the second direction (D2), and the orthographic projection of each light-splitting unit (210) on the display panel (100) covers Q pixel islands (120). In each pixel island (120), a connecting line of luminance centers of the N pixel units (110) comprised in each pixel unit row (131) also extends in the third direction (D3), and a first included angle between the third direction (D3) and the second direction (D2) is greater than 0 degrees and less than 90 degrees. The display device (300) can prevent moiré patterns.

A camera located behind a partially transparent display allows for a participant in a video conference to appear to be looking directly at other participants, creating a natural eye-to-eye setting similar to an in-person meeting. However, the camera picks up moiré patterns and other distortion from the display. A machine learning model is trained to predict the interference from a frame of video on the display. The predicted interference is then subtracted from a corresponding video frame from the camera, resulting in a clean image. The clean image is then used in place of the camera's video frame in output video, resulting in high quality video useful for a video conference.

An embodiment of the present disclosure provides a method for improving screen distortion (for example, moiré phenomenon) of a display, and an electronic device supporting the same. According to an embodiment, the electronic device may comprise a panel and a window formed on the panel. According to an embodiment, the window may comprise a front surface, a side surface, and a chamfer portion connecting the front surface and the side surface. According to an embodiment, the window may be diagonally processed such that a vertical straight section of the side surface of the window, which is perpendicular to the panel, extends from the chamfer portion and has a designated slope. According to an embodiment, the window may be processed such that the side surface of the window and / or the chamfer portion of the window have a designated shape on the basis of a refractive index of the window, and may be formed so as to prevent screen distortion on the basis of the designated shape. A window processing method according to an embodiment may comprise: a first setting process of setting the refractive index with regard to each material of a window; a second setting process of setting a designated processing scheme; a third setting process of setting a chamfer processing value corresponding to the refractive index in the designated processing scheme; and a processing process of processing a side surface and / or a chamfer portion of the window on the basis of the designated processing scheme and the chamfer processing value.

The invention discloses a screen shooting image moire quantification method and device and a storage medium, which are used for improving the compensation precision of a display screen. Acquiring a sub-pixel unit image of the display screen to be tested; performing brightness compensation processing on the sub-pixel unit image to generate an expected brightness compensation image; generating a compensation graph frequency spectrum amplitude image according to the brightness compensation image; generating a stripe frequency band sensing image according to the visual distance and the pixel pitch corresponding to the target color channel; carrying out region division on the frequency spectrum amplitude image of the compensation graph; standard deviations of the elliptical region and the plurality of elliptical ring regions are calculated, and a region standard deviation set is generated; filling a blank image with the standard deviation in the regional standard deviation set to generate a first elliptical ring standard deviation image; performing frequency domain filtering on the first elliptical ring standard deviation image by using the stripe frequency band sensing image to generate a first frequency domain filtering image; and generating a first moire quantization value corresponding to the brightness compensation image according to the compensation image frequency spectrum amplitude image and the first frequency domain filtering image.

This application discloses a focus adjustment method, system, and related apparatus for suppressing moiré pattern interference. The method includes: acquiring a sample image of a sample screen using a camera, and locating a real focus reference position based on the sample image using a preset focus algorithm; starting from the real focus reference position, acquiring a defocused image of the sample screen along the defocus direction according to a preset step size using the camera, and calculating the focus value; constructing a relationship model based on the focus value and the defocus distance; analyzing the rate of change of the focus value through the relationship model, and determining the target defocus position range by combining it with a preset change threshold; acquiring the current image of the screen under test using the camera within the target defocus position range, and calculating the current focus value; calculating the theoretical distance of the current focus value through the relationship model; obtaining the actual distance of the screen under test, and determining whether the difference between the theoretical distance and the actual distance exceeds a preset distance change threshold; if so, dynamically moving the camera to adjust the actual distance.

The present invention relates to detection of Moiré patterns in digital images by processing multiple digital images of a captured object and / or scene, where each of the multiple digital images is taken at a different image exposure and / or resolution. Additionally, the present invention relates to methods and systems for assessing the liveness of a captured biometric feature based on detection of Moiré patterns from the multiple digital images.

To provide an information recording body, a label, a program, a method for manufacturing the information recording body, an authenticity determination device, and an authenticity determination system which are devised so as to determine illegal duplication of a code by using a moire phenomenon.SOLUTION: In the information recording body 20 in which a code layer 21 formed by a first color and a pattern layer 22 formed by a color different from the first color are arranged on a base 10, the code layer 21 constitutes a code area having a code image, the pattern layer 22 constitutes a pattern area having one or more determination patterns, at least a part of the code image is formed so as to overlap with a partial area of the determination pattern in a plan view, and the determination pattern is a moire excitation pattern for exciting moire by overlapping of a first periodic pattern and a second periodic pattern.SELECTED DRAWING: Figure 2

The invention provides a wavefront-modulated continuous variable-focus microscopic imaging method and device, and the method comprises the steps: scanning a sample biological tissue through exciting light, and obtaining sample scanning return light; performing wavefront modulation on the sample scanning return light through a spatial light modulator to obtain a first modulation image and a second modulation image; the wavefront modulation comprises a Fresnel fringe modulation strategy and a moire fringe modulation strategy; the Fresnel fringe modulation strategy is used for modulation to obtain a first modulation image; the moire fringe modulation strategy is used for modulation to obtain a second modulation image; obtaining a target wavefront modulation strategy from the Fresnel fringe modulation strategy and the moire fringe modulation strategy according to the imaging definition of the first modulation image and the second modulation image; scanning the target biological tissue through the exciting light to obtain target scanning return light; and modulating the target scanning return light according to the target wavefront modulation strategy to obtain a microscopic image of the target biological tissue.

This invention provides a non-equidistant grating code disk and an absolute photoelectric shaft angle encoder. The non-equidistant grating code disk includes a main grating with an equal grating angle and a slit grating with a non-equidistant grating angle. The slit grating has a split-phase window, which includes m reference grating lines and m gradually changing precision code grating lines arranged on both sides of the reference grating lines. The reference grating lines are positioned at the midpoint of the bright moiré fringes that are alternated between each other when moiré fringes are generated by the equal grating angle. Starting with the first reference grating line, the positions of the gradually changing precision code grating lines on both sides of the reference grating line are adjusted sequentially, so that the grating lines generating dark moiré fringes on adjacent sides of the reference grating line increase in an arithmetic sequence from an angle of 0°, gradually changing n times to the target grating angle. This invention, by designing the arrangement of the slit grating precision codes, makes the photoelectric signal extracted from the generated moiré fringes closer to the theoretical sine wave.

The invention provides an overlay grating structure, a method and device for measuring an overlay error and a storage medium. The overlay grating structure comprises a first grating group, a second grating group and a first filling layer, the first grating group comprises a first grating with a first period and a second grating with a second period, and the second grating group comprises a third grating with the second period and a fourth grating with the first period; the second grating group is located right above the first grating group, the first filling layer is located between the first grating group and the second grating group, and the refractive index of the first filling layer is between the refractive index of air and the refractive index of the grating material. By adding the first filling layer in the first grating group and the second grating group, the transmission efficiency of light is remarkably improved, unnecessary reflection loss is reduced, and moire fringes with higher contrast can be formed.

The invention provides a micro-nano structure anti-counterfeiting element prepared based on a cold transfer technology and a preparation method thereof.The micro-nano structure anti-counterfeiting element prepared based on the cold transfer technology integrates first-level anti-counterfeiting, second-level anti-counterfeiting and third-level anti-counterfeiting, the counterfeit threshold can be greatly improved through the superposition design of the third-level anti-counterfeiting, and meanwhile verification requirements of different scenes are met; wherein the embossment / rainbow laser cold transfer film belongs to first-level anti-counterfeiting, authenticity can be directly judged through naked eyes, computer-generated holographic micro-nano structure shading of the shading cold transfer film belongs to second-level anti-counterfeiting and can be verified by means of a point light source, and the moire fringe decoding grating cold transfer film belongs to third-level anti-counterfeiting and can be verified by means of a point light source. A special effect is generated under a precise processing condition and has a processing barrier, meanwhile, a primary anti-counterfeiting effect of direct identification can be generated, white light is adopted to penetrate through the grating sheet to irradiate the surface of the printing ink, a multicolor light spot array is left on the surface of the printing ink, and multiple anti-counterfeiting functions are achieved.

This invention belongs to the field of image displacement measurement technology, and particularly relates to a displacement measurement method based on digital moiré fringes. The method includes: S1: acquiring images before and after displacement using a camera; S2: calibrating the spatial period of the acquired images and calculating the period difference of the two-dimensional cosine image using a preset FFT point count; S3: obtaining digital moiré fringe images before and after displacement; S4: processing the digital moiré fringe images before and after displacement using FFT, and obtaining the beat frequency envelope images before and after displacement based on the processing results; S5: calculating the fundamental initial phase of the difference frequency envelope of the beat frequency envelope images before and after displacement using a signal mode decomposition method; S6: obtaining the displacement value of the linear amplitude grating by combining the constant size of the linear amplitude grating. This invention requires only one linear amplitude grating to complete the displacement measurement.

The application discloses a registration mark structure with moire fringes, a detection method and a system, and relates to the technical field of precise optical measurement. The registration mark structure comprises a first registration mark structure and a second registration mark structure arranged in pairs, wherein a first grating area and a fourth grating area along a first direction, a second grating area and a fifth grating area along a second direction, and a third grating area and a sixth grating area of a third direction with a first direction and a second direction projection component are arranged; and multi-direction moire fringes are formed by superimposing corresponding grating areas. The detection method comprises the following steps: detecting a moire fringe image, determining a first displacement, a second displacement and a third displacement; and utilizing additional measurement information provided by the third displacement to verify or jointly calculate the displacements based on the projection relationship between the first displacement and the second displacement. The application provides additional direction constraint information by utilizing the third direction grating, and improves the reliability and stability of the registration measurement result.

The invention discloses a displacement measurement system and method for generating virtual moire fringes based on a digital grating, and belongs to the technical field of optical measurement, and the system comprises a laser light source, a real object scale grating, a light field collection module, a signal processing device, a digital indication grating, a virtual interference generation module and a displacement calculation module. In a physical space, a gray scale image generated by a light field reflected by the real object scale grating is captured by the light field acquisition module and is converted into a digital signal, and filtering and high-precision light field information extraction are realized by using the signal preprocessing module and the phase resolving module. In a digital space, a complex amplitude distribution function is used as a simulation carrier of optical behaviors of the digital indication grating, and generation parameters of the digital indication grating are configured to be consistent with a real scale grating. And calling a virtual interference generation module to superpose the preprocessed physical light field and the virtual light field, comparing an ideal moire fringe period with a reference moire fringe period acquired in real time, and carrying out real-time compensation on the parameters of the digital indication grating based on a digital closed-loop measurement method of error quantization-parameter adjustment-active compensation. According to the method, by dynamically updating grating parameters of a digital light field model, cooperative compensation of multi-source errors and real-time closed-loop compensation of whole-process measurement errors are achieved, and the stable requirement of ultra-precision manufacturing for nanoscale measurement is met.

The goal is to reduce the occurrence of moiré patterns caused by display elements. [Solution] The projection device comprises a light source unit 31, a diffractive optical element 33, a prism unit 321, a drive unit, and a display element 34. The light source unit 31 has an LD311. The diffractive optical element 33 diffracts the incident light. The prism unit 321 refracts the light incident from the LD311 and emits it to the diffractive optical element 33. The drive unit rotates the prism unit 321. The display element 34 uses the diffracted light to generate light having an image of the projection target and projects it onto the display target object 2. By rotating, the prism unit 321 continuously changes the angle of the incident direction of the emitted light from the prism unit 321 with respect to the normal of the incident surface of the diffractive optical element 33.

To provide a processing device that can detect the position of the chuck table with high precision. [Solution] The processing apparatus 2 comprises a chuck table 4, a processing means 6, an X-axis feed means 8 for processing and feeding the chuck table 4 in the X-axis direction, an illumination means 12 for irradiating light into the movable range of the chuck table 4, an imaging means 14 for acquiring an image within the movable range of the chuck table 4, and a moiré fringe generation mechanism 16. The moiré fringe generation mechanism 16 includes a grid chart in which reflective parts that reflect light and non-reflective parts that absorb light are alternately formed at first equal intervals, a photomask in which transmissive parts that transmit light and shielding parts that block light are alternately formed at equal intervals, and a projection lens for projecting light that has passed through the photomask onto the grid chart at second equal intervals. The processing apparatus 2 makes the first equal intervals and the second equal intervals different so as to generate moiré fringes, and the moiré fringes are imaged by the imaging means 14 to detect the position of the chuck table 4 in the X-axis direction.

The invention relates to a bipolar plate flatness detection method based on image moire, and the method is characterized in that the method comprises the following steps: S1, image collection condition setting: enabling the included angle between the optical axis of a camera and the normal of a bipolar plate to be controlled in a range of 30-60 degrees, enabling the shooting distance to be controlled in a range of 250-600 mm, and providing illumination; s2, moire image acquisition and preprocessing: acquiring an original digital image of a bipolar plate runner region under the imaging condition of S1, and performing resolution scaling and contrast enhancement preprocessing on the image; s3, moire feature enhancement and extraction: adopting a multi-segment threshold segmentation method for the preprocessed image, separating moire from the background, and forming a binary feature image; and S4, carrying out warping analysis and result output: carrying out qualitative and / or quantitative judgment on the surface flatness based on the extracted moire pattern morphological characteristics. Compared with the prior art, the method has the advantages of high sensitivity, low cost, high efficiency, workpiece damage prevention, reliable result, comprehensive analysis dimension and the like.

The invention discloses a method for improving the correction effect of a Demura algorithm, which comprises an offline part and an online part, and is characterized in that the offline part uses a deep learning mode to train a lightweight network for eliminating moire; in the online part, a trained network is used for an image acquisition stage of a Demura process and is used for eliminating a moire phenomenon caused by a camera, and progressive transition of mura correction is realized for initially generated Demura parameters by using a region filtering method; according to the method, in the Demura correction process, a mode of removing moire patterns through deep learning and using regional filtering is adopted, the correction process is simplified, the correction time is shortened, and the correction effect is improved.

This invention discloses a method for extracting moiré fringe phase information based on Morlet wavelet transform, comprising: converting a target moiré fringe image into a grayscale image; filtering the grayscale image to obtain a filtered binarized image; performing mathematical morphological denoising on the binarized image to obtain a processed image, wherein the mathematical morphological denoising includes erosion and dilation; convolving each column of the processed image using modulated Morlet wavelets and calculating the amplitude and phase of the wavelet coefficients; determining wavelet ridges based on the amplitude of the wavelet coefficients and extracting the phase of the scale coefficients and time coefficients corresponding to the wavelet ridge positions; and obtaining complete moiré fringe phase information based on the phases of all extracted columns. This method is highly accurate and easy to implement, making it suitable for further refractive index reconstruction and key parameter measurement of the measured flow field.