20 results about "High contrast imaging" patented technology

The invention relates to the field of industrial visual inspection, and discloses an ultraviolet visible light confocal object image double telecentric imaging optical system which comprises a first lens, a second lens, a first gluing piece, a diaphragm, a second gluing piece, a third lens and a fourth lens which are sequentially arranged from an object plane to an image plane, and an optical axis serves as a rotation center. Wherein the object surface of the first lens is a convex spherical surface, the curvature radius of the first lens is 110.02 mm, the image surface of the first lens is a concave spherical surface, and the curvature radius of the first lens is 65.59 mm; the object surface of the second lens is a concave spherical surface, the curvature radius of the second lens is-200.11 mm, the image surface of the second lens is a convex spherical surface, and the curvature radius of the second lens is-130.80 mm. The system can be suitable for measuring an object with the object distance of 110 mm and an industrial camera with the imaging image surface diameter of 11 mm or below, the aperture of the system is F / 8, the system is also suitable for ultraviolet and visible light environments, it is ensured that lossless and high-contrast imaging can still be achieved in different light source environments, and therefore high-precision and high-reliability surface defect recognition and classification tasks are supported.

This invention discloses a beam expander lens for laser scanning projection, relating to the field of laser projection display technology. It includes a first lens group, a second lens group, a third lens group, and a fourth lens group, arranged sequentially along the optical axis. These four lens groups together form the complete lens. The first, second, third, and fourth lens groups are arranged in a positive-negative-negative-negative optical power configuration. Through innovative optical architecture and optical power allocation, a large-angle beam expander function is achieved within a space of less than 35mm in total length, greatly saving internal space. By utilizing the chromatic aberration correction capability of the first lens group and the aberration correction capabilities of the second, third, and fourth lens groups, high-contrast imaging is achieved across the entire field of view and wavelength range, with concentrated dot matrix energy, meeting the requirements of high-resolution projection.

Disclosed in the present invention are a simple phenolic acid derivative- and rosmarinic acid derivative-based multimodal imaging probe and a use thereof. The multimodal imaging probe of the present invention has a structure selected from those represented by formulas (I to III). By subjecting phenolic acids such as danshensu, caffeic acid, ferulic acid, and rosmarinic acid to derivatization modification and by means of molecular imaging technology, the present invention realizes in vivo tracing and imaging of diseases such as various tumors (liver cancer, pancreatic cancer, and breast cancer), stroke, myocardial infarction, and acute kidney injury, and achieves in vivo and in vitro high-contrast imaging, real-time monitoring, and qualitative and quantitative evaluation. Moreover, the probe of the present invention itself has good metabolic properties and targeting performance, is simple to prepare and low in cost, and has broad clinical application prospects.

An illumination system for dark-field imaging may include one or more illumination sources providing temporally incoherent light with a first spatial profile, and two or more lens assemblies configured to direct the light from the one or more illumination sources as two or more illumination beams to a buried target along optical paths outside an objective lens of an imaging sub-system. The two or more illumination beams may fully overlap at the buried target to provide a common illumination field. The lens assemblies limit numerical apertures of the illumination beams to prevent specular reflection of the illumination beams from entering the objective lens. A respective one of the two or more lens assemblies includes a homogenizer to provide that a respective one of the two or more illumination beams has a second spatial profile with higher spatial uniformity than the first spatial profile according to a selected metric.

This invention belongs to the field of acoustic detection technology for partial discharge in power equipment, and relates to an array-type acoustic imaging partial discharge detection method and system. The method includes: establishing the correspondence between channel identifier sequences and array geometric parameters; dividing the array into subgroups according to a fixed subgrid and generating a synchronous sampling time sequence to acquire multi-channel pulse density modulation signals; demodulating and extracting the signals, bandpass filtering and pulse framing; constructing a forward-backward spatial smoothing covariance matrix and using minimum variance distortionless response beamforming to calculate the spatial spectrum to generate an acoustic image; and registering and superimposing the acoustic image with a visible light image to output the positioning result. The technical solution of this application achieves high-contrast imaging and stable positioning output through temporal and geometric consistency constraints, which can improve the consistency of on-site interpretation and meet the requirement of repeatable positioning under weak partial discharge ultrasonic conditions.

The invention discloses a magnetic resonance non-enhanced lower limb arteriovenous combined imaging method, which belongs to the technical field of medical imaging, and comprises the following steps: S1, judging acquisition times and carrying out first acquisition, S2, setting delay time of data acquisition, S3, configuring a rapid interruption steady state and carrying out data acquisition, S4, repeating the steps S1 to S3 until all regions finish a data collection process of the first acquisition, the method comprises the following steps of S1, carrying out first acquisition, S2, carrying out second acquisition, S5, switching to second acquisition, judging the number of acquisition times, and carrying out second acquisition, S6, carrying out data acquisition by using the same process as S2 and S3, S7, repeating the steps S5 and S6 until all regions complete data collection of the second acquisition, and S8, carrying out image reconstruction to obtain an arteriovenous separation image. By fusing the fast interruption steady-state sequence and the golden angle radial sampling track, lower limb artery and vein synchronous high-contrast imaging is achieved under the condition that electrocardio gating is not needed.

The utility model discloses a near-infrared lymph node detection system. The detection system comprises an infrared imaging system, the infrared imaging system comprises an excitation light source, a beam expanding element, a light path forwarding device, a light filtering device and a short-wave infrared sensor which are arranged along a light path, and an image processing and displaying device which is in communication connection with the short-wave infrared sensor; wherein the excitation light source is a continuous spectrum light source or a wavelength continuously adjustable light source. According to the utility model, based on a near infrared spectrum imaging technology known as a biological transparent window, image processing is carried out in combination with a model algorithm, and an innovative solution is provided for lymph node detection; according to the system, the low tissue scattering characteristic of a near-infrared window and the absorption peak difference characteristic of main biological components in a near-infrared spectrum are utilized, and high-contrast imaging of lymph nodes and surrounding adipose tissues is achieved without a tracer agent. The detection system provided by the utility model can provide real-time guidance and tracking for related operations.

An illumination system for dark-field imaging may include one or more illumination sources providing temporally incoherent light with a first spatial profile, and two or more lens assemblies configured to direct the light from the one or more illumination sources as two or more illumination beams to a buried target along optical paths outside an objective lens of an imaging sub-system. The two or more illumination beams may fully overlap at the buried target to provide a common illumination field. The lens assemblies limit numerical apertures of the illumination beams to prevent specular reflection of the illumination beams from entering the objective lens. A respective one of the two or more lens assemblies includes a homogenizer to provide that a respective one of the two or more illumination beams has a second spatial profile with higher spatial uniformity than the first spatial profile according to a selected metric.

The application discloses a kind of magnetic resonance non-enhanced lower limb arteriovenous combined imaging method, belong to medical image technology field, including S1, judging acquisition times, and carrying out first acquisition, S2, set the delay time of data acquisition, S3, configure fast interrupt steady state, and carry out data acquisition, S4, repeat S1-S3 until all regions are completed first acquisition Data collection process, S5, switch to second acquisition, and judge acquisition times, and carry out second acquisition, S6, using the same process as S2 and S3 carries out data acquisition, S7, repeat S5 and S6 until all regions are completed second acquisition Data collection, S8, image reconstruction is carried out, and the arteriovenous separation image map is obtained, the application uses above-mentioned method, by fusing fast interrupt steady state sequence and golden angle radial sampling track, realize lower limb arteriovenous synchronous high contrast imaging under the condition of not needing electrocardiogram control.

The invention discloses a coronagraph deformable mirror actuator dead pixel interference analysis method and system. The method comprises the following steps: constructing a coronagraph high-contrast imaging system framework; measuring the obtained defective pixel position information of the deformable mirror actuator, and fixing the defective pixel position information in an actuator control matrix; establishing a phase modulation control system based on an SPGD algorithm; establishing a convolution model with interferences among the actuators; the dead pixels are introduced into a dark space optimization process, and when dark space optimization is carried out through an SPGD algorithm, a system monitors key indexes of each quadrant dark space and observes the influence degree of the dead pixels on the dark space optimization process. Amplitude modulation is achieved through the focal plane modulation optical filter, the contrast ratio of the image plane reaches 10 <-6 > magnitude, phase modulation, namely dark space optimization, is achieved through the thousand-unit deformable mirror, and the contrast ratio reaches 10 <-8 > magnitude through the SPGD modulation algorithm; the dead pixel influence is introduced into the dark space optimization process, and the coupling influence of the dead pixel on the adjacent actuator is analyzed.

The invention belongs to the technical field of biological optical recognition, and discloses a biological recognition device based on a multi-wavelength light source and a GOI image sensor, and the device comprises a multi-wavelength light source module which is used for employing the multi-wavelength light source to irradiate a biological target; the image sensing module is used for collecting reflected light or transmitted light of a biological target through a GOI image sensor, generating a feature image according to the reflected light or the transmitted light and sending the feature image to the signal processing module; the signal processing module is used for processing the feature image to obtain image information and sending the image information to the biological detection module; the biological detection module is used for judging whether the image information is real biological image information or not based on a machine learning model; if yes, biological counterfeiting information is generated and sent to a feedback authentication module; and if not, sending the image information to a feedback authentication module. According to the invention, stable high-contrast imaging can be realized in a complex illumination environment, and the accuracy and robustness of the recognition device are improved.

The invention discloses an optical lens combined with a heterogeneous scattering unit array and a design method of the optical lens, which are applied to the field of optical elements, and aims to solve the technical problem that the existing optical lens is difficult to consider both central vision definition and peripheral defocus intervention efficiency. A personalized optical model is constructed according to the eye axis length, pupil dynamics and eye using behaviors of a user, a center area, a transition area and a peripheral area are divided, a sparse scattering unit, a gradient transition unit and a high-density strong scattering unit are configured respectively, the form, the size and the arrangement of the units are reversely deduced through a multi-target optimization algorithm, and a multi-target optimization model is constructed. Cooperative optimization of central high-contrast imaging and peripheral myopia signal enhancement is realized, intervention efficiency and wearing comfort are remarkably improved, a pupil adaptive adjustment layer is introduced, a scattering path is dynamically modulated to adapt to different illumination and visual tasks, and the performance of the lens can be dynamically adjusted according to the physiological state and eye use scene of a user.

The application discloses a 7-azaindole photoacoustic imaging probe for detecting superoxide anion, a preparation method and application, and the photoacoustic imaging probe is named AIH-OTF, which is a blue-green solid prepared from methyl trifluoromethanesulfonate, dye AIH-OH and the like; the AIH-OTF realizes high-contrast PA imaging of endogenous superoxide anion in living cells, and in-situ evaluation of occurrence and repair of acetaminophen-induced liver injury is also determined through non-invasive monitoring of the PA reaction of AIH-OTF to superoxide anion; the AIH-OTF probe can be used as a useful tool for accurately diagnosing drug-induced liver injury in vivo. The photoacoustic imaging probe can realize real-time detection of in-vivo superoxide anion through AIH-OTF and the ability of diagnosing DILI; the cell toxicity is small, the biological compatibility is good, and the photoacoustic imaging probe can be used for in-vivo imaging of occurrence and repair of DILI.

The invention discloses a water-soluble tetrasulfonic aza boron fluoride dipyrrole near-infrared fluorescent dye as well as a preparation method and application thereof. The fluorescent dye has the following structure: R is selected from-(CH2) nSO3-, and n is an integer greater than or equal to 2 and less than or equal to 6. The water solubility is remarkably improved through tetrasulfonic acid group modification, the fluorescent probe shows high fluorescent brightness in a water solution, the maximum emission wavelength is about 725 nm, the fluorescent probe is located in a biological tissue optical window, and high-contrast imaging of deep tissue is facilitated. Compared with clinical indocyanine green (ICG), the water solubility, the fluorescence quantum yield and the light stability are remarkably improved, the molar extinction coefficient is high, and the photobleaching rate is low; the synthesis route is simple, the repeatability is good, the product is easy to purify, and the biocompatibility is good. The dye is applicable to real-time navigation, tumor imaging and blood vessel visualization in fluorescence-guided surgery, and shows excellent clinical application potential and industrialization prospect.

The invention discloses an annular pupil modulation high-contrast coronagraph transmittance smooth design and a working method. According to the method, circular radial transmittance gradient modulation is carried out on the pupil of the telescope, and suppression of strong diffraction light of a fixed star is realized. According to the pupil modulation design concept with the gradually-changed circular ring band transmittance, limited circular rings are adopted, the transmittance of each circular ring is the same, energy distribution of a fixed star at the pupil position of an optical system is changed by further restraining the transmittance difference between the adjacent circular rings, and the optimal high-contrast imaging performance is achieved. According to the modulation band, the transmittance design curve of the modulation band is integrally smooth by restraining the transmittance difference of adjacent bands, the manufacturing process problem caused by violent transmittance jump of a traditional optical filter can be solved, the machining precision is further guaranteed, and the problems of wavefront phase jump and the like caused by sudden change of the thickness of a film layer can be solved; and the high-contrast imaging performance of the whole system is finally improved.

The application discloses a kind of high contrast imaging wave front detection and correction method and system, this method uses FPGA and CPU hybrid programming architecture to realize high-precision high contrast imaging wave front detection and correction, locking is realized to high contrast imaging dark area in closed-loop correction, wherein, high-precision wave front slope calculation is completed in FPGA, sub-aperture image division and wave front recovery calculation are realized in CPU, and voltage control deformable mirror correction wave front aberration is output.The application uses hybrid programming architecture to carry out high contrast imaging wave front detection and correction, realizes high-precision wave front detection and correction, solves the problem of insufficient performance of CPU for aerospace, and then realizes the locking of high contrast imaging dark area of space coronagraph, for direct imaging detection of exoplanet.After wave front detection and correction, the energy stability of high contrast imaging dark area can be guaranteed, and dark area locking is completed.

An illumination system for dark-field imaging may include one or more illumination sources providing temporally incoherent light with a first spatial profile, and two or more lens assemblies configured to direct the light from the one or more illumination sources as two or more illumination beams to a buried target along optical paths outside an objective lens of an imaging sub-system. The two or more illumination beams may fully overlap at the buried target to provide a common illumination field. The lens assemblies limit numerical apertures of the illumination beams to prevent specular reflection of the illumination beams from entering the objective lens. A respective one of the two or more lens assemblies includes a homogenizer to provide that a respective one of the two or more illumination beams has a second spatial profile with higher spatial uniformity than the first spatial profile according to a selected metric.

Multi-path projection systems and methods of control for the same. One example projection system includes a first light source configured to emit a first light and a second light source configured to emit a second light. The projection system includes a PLM configured to receive the second light and steer the second light as a modulated light. The projection system also includes a DLP configured to receive the first light and the modulated light. The DLP is configured to modulate received light to generate an image. When the image has an APL value below an APL threshold, the first light source is controlled to an off state and the second light source is controlled to emit the second light. When the image has an APL value above or equal to the APL threshold, both the first light source and the second light source are controlled to emit light.

The invention provides equipment for representing surface flatness of a liquid crystal substrate, which comprises a measuring box body, feeding windows are arranged on the front surface and the back surface of the measuring box body, elastic lifting baffles are assembled in the feeding windows, and a material conveying assembly is fixedly mounted on the inner wall of the measuring box body at the positions of the baffles; material loading devices are fixedly installed at the bottom in the measuring box body and located on the two sides of the material conveying assembly, a detection device is fixedly installed on one side of each material loading device, a color developing assembly is fixedly installed on the portion, on the other side of each material loading device, of the measuring box body, and a shooting assembly is fixedly installed at the top of the measuring box body above the color developing assembly; and an irradiation assembly is fixedly mounted at the top of one side in the measuring box body. According to the invention, a high-contrast imaging background is provided for flatness projection of the substrate through the gradient bottom color layer coated on the surface of the bottom cloth in the color developing assembly, the flatness difference of the surface of the substrate can be clearly presented, the imaging blurring is avoided, and a high-quality visual material is provided for subsequent picture analysis.

The present invention discloses a telescope system simulation method and device for testing ultra-high contrast imagers. The method comprises: collimating a white light point source, reflecting it onto a first deformable mirror, and then reflecting it again before being incident on a second deformable mirror; controlling the actuator unit matrices of the first and second deformable mirrors to move row by row or column by column on a phase screen image simulating upper atmospheric turbulence and near-surface atmospheric turbulence, respectively, and establishing a conversion relationship between the pixel values ​​of the phase screen image and the travel of the deformable mirror actuators; and causing parallel light containing wavefront distortion to be reflected by the second deformable mirror and pass through a telescope pupil simulation aperture, where it is converged to form a primary focus, and the scaled parallel light is converged to form a secondary focus. The present invention can simulate the dynamic disturbances caused by upper atmospheric turbulence and near-surface atmospheric turbulence on the incident light wavefront during ground-based astronomical telescope imaging observations, and can also simulate the pupil shape and position of an astronomical telescope.