20 results about "Dynamic speckle" patented technology

The utility model relates to a large-scale speckle projector, a depth camera and electronic equipment, which are characterized in that a light source is used for projecting floodlight; the collimating lens group is positioned on an emergent light path of the light source and is used for collimating the floodlight; the dynamic speckle generator is positioned on the light emitting side of the collimating lens group and can generate different speckles from the floodlight; an adaptive projection lens; the focal plane of the self-adaptive projection lens is conjugated with the dynamic speckle generator so as to automatically adjust the focal length according to the change of the size of the speckle and ensure that a zero-order speckle is formed; and the DOE diffraction device is positioned on the light-emitting surface of the adaptive projection lens so as to copy the zero-order speckles. According to the utility model, the problems of insufficient flexibility and insufficient projection speckle uniformity and quantity existing in a speckle projection scheme in the prior art can be solved, and uniform high-density speckle projection is realized.

The invention discloses a space target transaction detection method and system based on laser dynamic speckles, and relates to the technical field of space target monitoring, and the method comprises the steps: constructing a space target model comprising a movable assembly; emitting a laser beam to the space target model, and collecting a dynamic speckle field formed by scattering; extracting a light intensity time domain signal based on the dynamic speckle field; extracting the characteristic frequency of the dynamic speckle field based on the light intensity time domain signal; establishing a correlation model for representing a corresponding relation between different motion states of the transaction component and the characteristic frequency of the dynamic speckle field; and comparing with the correlation model based on the characteristic frequency, and obtaining a target transaction judgment result based on a comparison result. Therefore, high-sensitivity and non-contact detection and identification on the tiny transaction of the space target component are realized.

The invention provides an axial spatial resolution enhanced structured light illumination fluorescence microscope based on dynamic speckle illumination. The method is characterized in that a laser beam is modulated by a reflective spatial light modulator to generate two laser beams containing laser speckles, and the two laser beams are coherently superposed at a focal plane of a microscope objective to generate a structured light illumination sample containing randomly variable speckle patterns. And super-resolution fluorescence microscopic imaging in an XY plane is realized through a four-step phase shift method. At each phase shift position, the speckle pattern superimposed in the structured light pattern is dynamically changed to obtain a series of fluorescence images. And extracting a fluorescence signal which changes severely in the focal plane by using a root-mean-square algorithm so as to improve the axial spatial resolution of the system. The system constructed by the invention can realize high-spatial-resolution fluorescence microscopic tomography imaging of the three-dimensional structure of the sample to be detected, has the characteristics of high three-dimensional spatial resolution, simple structure, convenience in operation and the like, and has wide application prospects in many research fields such as biology, medicine, life science and the like.

The invention relates to the technical field of agricultural machinery intelligent perception, and discloses a straw picking state real-time identification method based on depth spatial-temporal feature modeling, which comprises the following steps: S1, constructing a light-force dual-mode perception environment, collecting a dynamic speckle image sequence of a picking area by using a laser transmitter and an industrial camera, meanwhile, a piezoelectric sensor installed at the root of the picking elastic claw is used for collecting an elastic claw vibration signal; s2, performing frequency domain analysis on the elastic claw vibration signal, and extracting friction acoustic characteristics to invert an environment dust factor of a current operation environment; and S3, medium parameter calibration is carried out on the laser speckle transmission model based on the environmental dust factors, dust scattering interference is eliminated, and a transverse velocity field of the straw flow is calculated. And speckle decorrelation deviation caused by multiple scattering is compensated by introducing a medium transmission correction function, so that the problem of measurement failure in a severe high-dust agricultural operation environment is solved, and the accuracy and stability of straw flow velocity field measurement are ensured.

The invention relates to the technical field of fermentation process online analysis, and discloses an agricultural microbial preparation fermentation multi-dimensional optical intelligent tracking monitoring method and system.The method comprises the steps that a macroscopic color image of an organic fertilizer is collected to extract color features representing the biochemical state of the organic fertilizer; according to the macroscopic features, adaptively selecting two wavelengths with the shalest optical penetration depth and the deepest optical penetration depth, and respectively collecting microscopic dynamic speckle videos of the shallow layer and the deep layer of the organic fertilizer; and calculating shallow and deep microbial activity indexes and radial activity gradients for representing the microbial activity degree through visual analysis. According to the method, macroscopic color features and microscopic dynamic indexes are fused, multi-dimensional comprehensive features are constructed, real-time and accurate state diagnosis is performed by using a time sequence deep learning model, a control instruction and early warning information are generated according to the state diagnosis, and the accuracy and reliability of fermentation state diagnosis are improved through fusion of macroscopic and microscopic information and cross validation judgment.

This invention discloses a scattering imaging system and a scattering imaging method. The scattering imaging system includes: a light source module for generating dynamic speckle patterns illuminating various target objects in a scattering medium; and an imaging module for acquiring a mixed speckle pattern formed after the target objects are illuminated by the dynamic speckle. After acquiring the mixed speckle pattern containing the target objects, fingerprint speckle patterns of each target object are extracted. The fingerprint speckle patterns are then scaled, and the relative depths between the target objects are determined based on the scaling ratio. A deconvolution algorithm is used to obtain the lateral relative positional relationships between the target objects, and finally, a three-dimensional image with a large field of view is obtained.

A homogeneous laser illumination system for microscopy applications, based on the use of multimode optical fibers (MMF), is described. The system's operating principle relies on the superposition of dynamic speckle patterns generated from several multimode fibers. These patterns are created by applying random, high-frequency perturbations (tens of kilohertz) induced by a piezoelectric actuator that perturbs the optical fibers. The superposition of these patterns reduces illumination contrast, achieving a uniform light distribution across the field of view (FOV). The system's modularity and adaptability allow for its integration into existing microscopy setups. Furthermore, it can be configured to operate with standard commercial objective lenses, including immersion lenses, and adjusted to reduce photobleaching in fluorescent samples.The system uses multimode optical fibers and requires no additional infrastructure to manage vibrations or mechanical noise. It is suitable for fluorescence microscopy and has been successfully tested with wavelengths across the visible spectrum. The system enhances the illuminated area and optimizes the generation of homogeneous light patterns, providing a high-performance and efficient solution for obtaining high-quality images in microscopic studies.

The application provides a method and device for observing myocardial blood perfusion rules, wherein the method for observing myocardial blood perfusion rules comprises the following steps: acquiring a plurality of high signal-to-noise ratio dynamic speckle images of a pretreatment area on myocardium; acquiring three-dimensional position information of the pretreatment area; acquiring a blood perfusion amount space-time distribution map of the pretreatment area according to the high signal-to-noise ratio dynamic speckle images and the three-dimensional position information; and determining a to-be-treated area in the pretreatment area according to the blood perfusion amount space-time distribution map and a blood perfusion amount threshold value. The method and device for observing myocardial blood perfusion rules provided by the application are aimed at solving the problems of traditional technology that myocardial blood perfusion rules are not easy to observe and myocardial lesion areas are difficult to locate.

The invention relates to the technical field of medical image processing and artificial intelligence analysis, in particular to a mechanical perfusion heart coronary artery recognition and flow velocity estimation method based on laser speckle imaging, and is suitable for donor heart function evaluation and organ quality screening before heart transplantation. Comprising the following steps: continuously imaging the surface of an isolated heart in a mechanical perfusion state to acquire a dynamic speckle image sequence, inputting the dynamic speckle image sequence into a wavelet enhancement nnU-Net model to generate a coronary artery segmentation mask, and applying the coronary artery segmentation mask to the dynamic speckle image sequence to extract image data only containing a coronary artery region, and then generating a blood flow index map, analyzing the periodic change of the blood flow index in the coronary artery region to construct a blood flow velocity change curve, and estimating the hemodynamic parameters of the coronary artery. According to the application, automatic coronary artery identification and quantitative estimation of the blood flow velocity can be carried out on the mechanically perfused isolated heart, so that rapid and accurate non-invasive evaluation on the coronary artery system of the donor heart before heart transplantation is realized.

The invention provides an OCT speckle noise dynamic suppression system and method based on a spatial light modulator, the system comprises an OTC imaging system and a spatial light modulation unit, the OTC imaging system comprises an OCT light source, a first optical fiber coupler, a first circulator and a second circulator 4; the OCT light source is used for emitting broadband swept-frequency light, the optical fiber coupler I is used for dividing the emitted broadband swept-frequency light into a reference light beam and a sample light beam, the spatial light modulation unit comprises a triangular prism, a spatial light modulator and a 4f system, and the sample light beam is emitted from the collimator II and then is transmitted to the optical fiber coupler II; after passing through the horizontal polarizer, the sample light beam is reflected by the triangular prism to irradiate a screen of the spatial light modulator for modulation, the modulated sample light beam is subjected to zero-order unmodulated sample light beam filtering by an aperture diaphragm in the 4f system, and finally the sample light beam irradiates a sample through the galvanometer; according to the invention, a plurality of customized random speckle phases are loaded on a sample light wave front by using a spatial light modulator to obtain a sample structure diagram under different speckle phases.

The invention provides a method for testing dynamic speckles displayed by laser. The method comprises the following steps of: a) acquiring multiple frames of laser speckle images of an area to be detected by using an imaging device; b) calculating the average space speckle contrast ratio and the average time speckle contrast ratio of the area to be detected according to the multiple frames of laser speckle images; c) collecting the average static space speckle contrast ratio of the test system, and calculating system coherence parameters according to the average static space speckle contrast ratio; step d), according to the formula, calculating to obtain a dynamic component proportionality coefficient of the to-be-measured area; and e) according to the mixed scattering model formula, calculating to obtain the dynamic speckle index of the to-be-measured area.

The invention discloses an artificial intelligence-based ultrasonic image recognition system for an atrial deficiency heart disease, and relates to the technical field of ultrasonic image recognition. The system comprises an image acquisition module, a dynamic speckle suppression module, a body position self-adaptive correction module, a multi-scale micro-feature capture module, an atrial defect identification and quantification module and a result output module, wherein the image acquisition module realizes original data acquisition and standardization processing; the dynamic speckle suppression module dynamically adjusts a filtering strategy based on atrial deficiency pathological features, and balances noise elimination and edge feature reservation; the body position self-adaptive correction module corrects body position deformation to ensure the consistency of atrial deficiency forms based on cardiac anatomy prior; the multi-scale micro-feature capturing module is combined with a pathological attention mechanism to accurately extract small defect features; and the room defect identification and quantification module completes room defect positioning, type classification and core parameter quantification. According to the invention, the small defect identification precision can be obviously improved, and technical support is provided for early accurate diagnosis of atrial deficiency.

This utility model discloses a dynamic speckle detection system embedded inside a laser projector, relating to the field of laser projector technology. It includes: a laser projection light source, a beam combining and homogenizing module, a speckle suppression module, an image modulation module, a speckle measurement module, and a speckle suppression drive module. The speckle suppression module includes a vibrating device, and the speckle measurement module includes an image acquisition unit and a control unit. The optical axis of the speckle measurement module points towards the projection screen. The output of its image acquisition unit is connected to the control unit, and the output of the control unit is connected to the speckle suppression drive module. The output of the speckle suppression drive module drives the vibrating device. This utility model embeds the speckle measurement system inside the laser projector, allowing arbitrary modulation of the speckle suppression module's operating state according to the actual projection pattern. This avoids the speckle suppression module operating at maximum performance for extended periods, reducing laser power consumption and heat dissipation burden, and significantly improving the lifespan of the speckle suppression module.

This disclosure relates to portable speckle imaging system and method for automated speckle activity map based dynamic speckle analysis. The embodiments of present disclosure herein address unresolved problem of capturing variations in speckle patterns where noise is completely removed and dependency on intensity of variations in speckle patterns is eliminated. The method of the present disclosure provides a correlation methodology for analyzing laser speckle images for applications such as seed viability, fungus detection, surface roughness analysis, and / or the like by capturing temporal variation from frame to frame and ignoring the intensity of speckle data after denoising, thereby providing an effective mechanism to study speckle time series data. The system and method of the present disclosure performs well in terms of time efficiency and visual cues and requires minimal human intervention.

This application relates to the field of health monitoring and discloses an occupational fatigue cumulative risk early warning system based on multidimensional features of tongue surface images. The system includes: an image acquisition unit for acquiring a mixed response image sequence of the subject's tongue surface, containing dynamic speckle features and macroscopic deformation features; a pneumatic excitation unit for applying controllable non-contact mechanical micro-perturbations to the tongue surface, generating instantaneous impact and evaporative cooling effects to induce forced vibration response of the tongue surface soft tissue and cold pressure contraction response of microvessels, respectively; and a positioning support unit for fixing the subject's head posture and limiting non-testable displacement. By employing a non-contact pneumatic and optical coupling detection mode, controllable airflow pulses are used to replace traditional contact-type mechanical probes or electrodes. This design avoids direct contact between the test probe and the oral mucosa, effectively eliminating the risk of cross-infection and measurement errors caused by uneven contact pressure.

The invention discloses an assembly and method for improving the suppression effect of a dynamic speckle suppression element, and relates to the technical field of speckle suppression elements, the assembly comprises n focusing lenses, n beam expanding lenses, an inner side reflector group and n collecting lenses; the n focusing lenses are located on the right side of the dynamic speckle suppression element, the n beam expanding lenses are located on the left side of the dynamic speckle suppression element, and the n focusing lenses and the n beam expanding lenses are equal in height in a one-to-one correspondence mode. On the premise that complex elements are not additionally introduced and light loss is not increased, low-loss phase pre-modulation is achieved through small-area first incidence, the speckle suppression core effect is guaranteed through large-area second incidence, meanwhile, the height of a focusing lens and the height of a beam expanding lens are correspondingly arranged, it is guaranteed that light field propagation is accurate and free of offset, and the light field propagation efficiency is improved. The light path guide of the inner side reflector group makes the whole structure compact, does not occupy too much horizontal space, and effectively breaks through the pain point that the inhibition effect and the light loss are difficult to balance in the traditional dynamic speckle inhibition technology.

The invention discloses a multi-mode co-location measuring system and a multi-mode co-location measuring method for birefringence and blood flow detection of biological tissues, and the multi-mode co-location measuring system for birefringence and blood flow detection of the biological tissues comprises a multi-mode co-location measuring system and a multi-mode co-location measuring method, two technologies of measuring tissue birefringence characteristics through speckle interferometry and measuring micro blood flow distribution through speckle contrast imaging are fused on a single optical platform, and by controlling opening and closing of a reference light path, the system can realize high-sensitivity phase / birefringence interferometry and closing of the reference light when the reference light is opened, so that high-sensitivity phase / birefringence interferometry is realized. And the dynamic speckle statistics is used for measuring blood flow distribution for switching. According to the two modes, a homologous illumination light path and a shared core detection light path are used, it is ensured that after the modes are switched, the same area of a biological sample is imaged, image registration errors which are difficult to overcome in traditional subsystem imaging are eliminated, fine structure information and microcirculation hemodynamic information of tissue are synchronously obtained, and the imaging accuracy is improved. And a co-location and real-time imaging means is provided for researching space-time correlation between tissue microstructure change and local hemodynamic change.

The invention discloses a rotary diffusion device which comprises a fixed driving mechanism, the fixed driving mechanism comprises a fixed driving part body and a fixed driving coil, the fixed driving part body is of a hollow annular structure and comprises an inner wall and an outer wall, and the fixed driving coil is arranged on the inner wall of the fixed driving part body; the fixed driving coil is fixedly arranged on the inner wall of the fixed driving part body, and the middle area of the fixed driving mechanism is in a through hole shape; the rotating mechanism comprises a rotating part body, the middle area of the rotating part body is in a through hole shape, the rotating mechanism and the fixed driving mechanism are arranged in a matched mode, and the fixed driving mechanism can drive the rotating mechanism to rotate in the preset direction; and the diffusion sheet is fixedly arranged in the through hole in the middle area of the rotating part body. And the diffusion sheet is arranged in the rotating part body, so that dynamic speckle treatment is realized, and the speckle eliminating effect is remarkably improved.

The invention provides a semiconductor device super-resolution microscopic device and method based on spatial spectrum estimation. The device comprises an LED light source, a collimating beam expander, a rotatable scattering sheet, a collimating lens, a polarizer, a relay lens, a polarizing beam splitter, a 1 / 4 wave plate, a microscope objective, a semiconductor wafer sample, an analyzer, a tube lens and a camera. Dynamic speckle illumination is used for inducing the surface of a semiconductor wafer sample to generate optical fluctuation response, a super-resolution fluorescence microscopic imaging technology based on spatial spectrum estimation is applied to the technical field of semiconductor measurement for the first time, and unmarked, high-speed and super-resolution imaging measurement of a semiconductor device is realized.

The invention discloses a rotating target alignment method and system based on laser dynamic speckles, and relates to the technical field of space target monitoring, and the method comprises the steps: simulating the distribution of a laser speckle field in a target rotating polar region under different error states, and extracting a corresponding experiment characteristic frequency minimum value as a key index; fitting is carried out based on a relation distribution rule of the key indexes and the error states corresponding to the key indexes, and an error-characteristic frequency mapping model is obtained; acquiring a real-time power spectrum of the rotating target to be measured; inputting the real-time power spectrum into an error-characteristic frequency mapping model to obtain error data of the rotating target to be measured; and adjusting the to-be-measured rotating target based on the error data until an alignment state is reached. Accurate measurement of speed and frequency parameters of various motion forms such as translation, rotation, vibration and the like is achieved, and then the alignment efficiency and precision are improved.