66 results about "Active illumination" patented technology

The invention discloses a polarization spectrum modulation type multispectral stereo imaging method which solves the problem that in the prior art, an existing polarization spectrum imaging scheme does not achieve three-dimensional reconstruction of a target and achieves the purpose that the three-dimensional reconstruction of the target is not achieved under the condition that active illumination or special marks are not needed. Synchronous high-precision reconstruction of physical attributes and three-dimensional geometry of the surface of the target is realized; the method comprises the following steps: uniformly modulating polarization information and spectral information of incident light of a target through a three-way optical filter and a polaroid to obtain modulated incident light information; performing aliasing acquisition of a plurality of polarization spectrum components on the modulated incident light information through a multi-color detector combination to obtain aliasing light intensity; performing linear solution on the aliasing light intensity to obtain each polarization spectrum component vector, calculating the polarization degree and the polarization angle of each channel, and further deriving a surface zenith angle and an azimuth angle; reconstructing the three-dimensional morphology of each spectrum channel through normal gradient field frequency domain integration; and finally, fusing the multi-spectral three-dimensional data to obtain a multi-spectral three-dimensional imaging result.

The invention discloses an underwater image enhancement method and system based on binocular vision and polarization imaging. The method comprises the following steps: firstly, synchronously acquiring an orthogonal polarization image pair through a binocular polarization imaging unit, recovering scene depth information from the polarization image pair by using a binocular stereoscopic vision technology, and calculating a transmissivity graph; analyzing the polarization characteristic difference between target reflected light and backscattered light, establishing a polarization difference model, and separating background scattered light; solving an underwater imaging equation in combination with the depth information and a polarization difference model to obtain a preliminary restoration result of the target reflected light; and finally, further improving the image quality through the steps of multi-scale spectrum analysis, adaptive filter construction and post-processing by adopting a spectrum adaptive image enhancement technology. The system comprises a binocular polarization imaging unit, a calculation processing unit and an active illumination unit. According to the method, the problems of color distortion, low contrast and fuzzy details of the underwater image are solved, and the visual quality and usability of the underwater image are improved.

The invention discloses a complex underwater environment de-scattering imaging method based on a Mueller matrix, and the method comprises the steps: measuring a Mueller matrix M of a target scene and illumination information of the target scene, and the illumination information comprises active illumination information and passive illumination information; when it is judged that the target scene only has active illumination through the illumination information, transmittance graph parameters are optimized by calculating the average linear polarization degree and the average circular polarization degree of the scene based on an image imaging model so as to recover a target clear image; when it is further judged that the target image is in the natural light and non-uniform illumination state, an image contrast enhancement algorithm is adopted to recover the target clear image; otherwise, a maximized backscattered light polarization degree algorithm or an enhanced image contrast algorithm can be adopted to recover the target clear image. The method is simple in calculation and easy to implement, does not need complex parameter estimation or configuration adjustment of a measuring instrument, and is suitable for real-time processing.

A particle beam illuminating system includes a beam steering control subsystem configured to receive charged particles and to generate and scan a particle beam over at least a portion of a target located a distance of at least 10 meters from the beam steering control subsystem. The system further includes a beam charge control subsystem configured to receive the particle beam from the beam steering control subsystem and to control an output charge of the particle beam impinging the target.

The invention relates to the technical field of robots and computer vision, in particular to an anti-dynamic-shielding mechanical arm visual servo method and system, and the method comprises the steps: calibrating an illumination response reference model before servo; in the servo process, the environment monitoring system senses the dynamic obstacle and predicts the movement of the dynamic obstacle; according to the predicted illumination disturbance, the active illumination array performs reverse compensation to maintain the image quality; and the system continuously evaluates the comprehensive stability index, and performs hierarchical response according to the index value, including illumination compensation, path maintenance or obstacle avoidance re-planning. According to the mechanical arm visual servo method and system capable of resisting dynamic shielding, the technical problem that in the prior art, due to the fact that illumination sudden change and physical shielding cannot be effectively processed during dynamic shielding, a visual system fails in advance is solved, and the mechanical arm visual servo method and system capable of resisting dynamic shielding can achieve pre-judgment and actively compensate illumination disturbance; servo task continuity is ensured under a multi-level response mechanism, and stability and robustness of a visual system in a complex dynamic environment are guaranteed.

The invention discloses a rapid double-reflection non-vision-field imaging method based on important light screening, and the method comprises the steps: carrying out the calibration of a sampling system based on an NLOS scene, and determining the size of a to-be-reconstructed space; changing a laser light path illumination hidden space, obtaining a shadow image generated by active illumination, and processing the shadow image based on calibration information to obtain a pose and shadow binary image under three-dimensional coordinates; carrying out light ray modeling based on a double-reflection NLOS scene, and building a three-dimensional reconstruction network of a shadow scene; sampling the shadow binary image by using a multi-resolution sampling method based on edge intensity; inputting the sampled shadow binary image and the pose into a reconstruction network for training; dynamically sampling the obtained shadow binary image by using a difference light sampling method; and three-dimensional reconstruction of the NLOS dynamic scene is realized. According to the method, low delay is realized in the aspect of reflecting dynamic change of a scene, and reconstruction of a moving object is completed.

The present application relates to computer vision and three-dimensional reconstruction technical field, disclose a kind of based on image recognition's building decoration component three-dimensional modeling method, method includes the following steps: receiving near-axis active illumination image sequence, solving camera pose and equivalent point light source trajectory;Inverse projection two-dimensional foreground mask generates maximum base envelope grid;Combining brightness gradient and texture high-frequency edge tensor field removes false shadow, extract effective sweep shadow mask;Tracking shadow residual optical flow displacement and combining light source trajectory analysis absolute depth, generate local three-dimensional point cloud;Surface reconstruction is executed to point cloud and opening plugging constructs negative space primitive entity grid;Extract the Laplace curvature energy of interface to generate normal shrinkage constraint, control entity grid after shrinkage and envelope grid execute Boolean difference set operation output model.The present application extracts absolute depth in featureless recessed area, and eliminates the boundary interference and distortion of grid Boolean operation.

The application provides a detection device and method for fasteners and a fastener, and belongs to the technical fields of precision manufacturing and industrial visual detection. The method comprises the following steps: performing multi-spectrum active illumination configuration on a fastener production line to generate multi-spectrum illumination parameter data; deploying a multi-spectrum light source array according to the multi-spectrum illumination parameter data to construct a multi-spectrum active sensing network; and through the fusion application of multi-spectrum active illumination and neural radiation field three-dimensional reconstruction technology, the recognition accuracy of the surface defects of the fastener is significantly improved, the geometric size measurement is realized to the level of ±0.003 mm, and the detection rate of the micro defects is improved to 99.5%.

The contamination sanitation inspection system (CSIS) allows a user to capture an image of a large scene (such as a food processing line, a food service facility, a food products storage area, or a plant production area / facility) and identify contamination within the scene and preferably represent the contamination on a spatially accurate map (or floorplan) so that contamination within the inspection map area is clearly identified and recorded for subsequent treatment. In an alternative embodiment, the CSIS also includes a decontamination system to sanitize any identified contamination.

The invention discloses a photographic image enhancement method based on a low-altitude economic unmanned aerial vehicle, and the method comprises the steps: transmitting a laser pulse, obtaining an echo signal of the laser pulse, and obtaining echo power data changing along with the echo time; acquiring a first image of active illumination and a second image of passive illumination in the same observation period; calculating atmospheric extinction coefficient distribution on a path from an observation point to a scenic spot according to the echo power data, and constructing a three-dimensional atmospheric particle field based on the atmospheric extinction coefficient distribution; calculating a target direct illumination component of the scene, and acquiring a spectral signal of the second image as a target spectral signal; obtaining a target intrinsic material parameter under passive illumination and a target illumination parameter after interference removal; and synthesizing and outputting an enhanced image through a graphic renderer. According to the method, the final enhanced image is established on the real atmospheric physical model, the problem of scene information loss in the prior art is solved, and the quality of the enhanced image is improved.

A measurement system with active illumination using pulsed semiconductor diodes and a detection system comprising a camera imager with lenses and spectral filters that is synchronized to the pulsed diodes. The light generated by the diodes may comprise visible or near-infrared wavelengths. The measurement system may also comprise a time-of-flight sensor or a beam splitter to separate the diode light into a plurality of spatially separated lights. The detection system may be configured to receive light reflected from tissue comprising skin and may be configured to perform a differential measurement between a hand and another region of tissue. The measurement system including a processor may be configured to identify veins in the hand or measure oxygen level in blood. The system may be used to identify an object or to measure physiological parameters. The system may also be coupled to a cloud service and use artificial intelligence in making decisions.

An axicon scatter filter assembly operates on light that is approximately temporally and spatially coherent (requiring either active illumination or a very narrow field of view). The filter exploits the difference in behavior between spatially coherent and spatially incoherent light. Spatially coherent light is shaped and moved by the axicons. This allows the spatially coherent light to diverge and then be reconstructed into a rectified image. The spatially incoherent light is neither shaped nor moved by the axicons. Where the coherent light diverges, the incoherent (scattered) light does not. Thus, masks can be used to block a portion of the incoherent light while passing all of the incoherent light. The filter assembly thus removes undesired scattered light that degrades image quality. The axicons then reconstruct the original image with less scattering, which can be imaged by a lens and camera.

Sensor methods and systems incorporating an integrated illumination or light source are provided. The sensor can include a plurality of pixels and the integrated light source. The sensor can additionally include or be associated with imaging optics. The light source operates to generate illumination light that is passed through the imaging optics towards a scene within a field of view of the sensor system. Objects within the field of view reflect light that is collected by the imaging optics and passed to at least some of the pixels. In at least some configurations, an output of the light source is located adjacent the pixels, and provides the illumination light to the imaging optics by reflecting the illumination light from at least some of the pixels. In other configurations, the light source excites pixel elements, which then produce illumination light that is provided to the imaging optics.

The invention relates to a direct flight time ranging method and system for structured light illumination, and belongs to the technical field of industrial automation, and the method comprises the steps: projecting a structured pulse laser illumination field to a target scene; the structured pulse laser illumination field forms a space pattern with a light and shade alternating contrast characteristic in the space; the spatial pattern at least comprises a high-brightness active illumination area and at least one low-brightness or non-illumination background reference area; identifying and separating a background light signal from a background reference area from light signals based on the distribution of the light signals of the active lighting area and the background reference area in the space pattern by projecting a structured pulse laser lighting field; according to the invention, the background noise component is estimated based on the background light signal, and the noise contribution related to the background noise component is removed from the light signal reflected by the target object in the target scene to obtain the effective signal after background suppression, so that the effective noise removal and the accurate detection of the effective signal are facilitated, and the distance measurement accuracy is improved.

A measurement system comprising one or more semiconductor diodes configured to penetrate tissue comprising skin. The detection system comprising a camera, which may also include a direct or indirect time-of-flight sensor. The detection system synchronized to the pulsing of the semiconductor diodes, and the camera further coupled to a processor. The detection system non-invasively measuring blood within the skin, measuring hemoglobin absorption between 700 to 1300 nm, and the processor deriving physiological parameters and comparing properties between different spatial locations and variation over time. The semiconductor diodes may comprise vertical cavity surface emitting lasers, and the detection system may comprise single photon avalanche photodiodes. The measurement system may be used to observe eye parameters and differential blood flow. The system may be used with photo-bio-modulation therapy, or it may be used in advanced driver monitoring systems for multiple functions including head pose, eye tracking, facial authentication, and smart restraint control systems.

The invention relates to a measuring point device (100) for measuring an object (200). The measuring point device (100) has a minimum dimension length (110) of at least 5 cm, a maximum dimension length (110) of at most 50 cm, a minimum dimension width (120) of at least 5 cm, a maximum dimension width (120) of at most 50 cm, a minimum dimension height (130) of at least 10 cm, and a maximum dimension height (130) of at most 125 cm, preferably at most 100 cm, particularly preferably at most 75 cm, and more specifically at most 50 cm. Furthermore, the measuring point device (100) has an identification device (140). The identification device (140) further comprises a passive identification means (142) and / or an active identification means (144). Furthermore, the identification device (140) has an active illumination means (150) and a passive illumination means (160).The identification device (140) allows for the unambiguous identification of the measuring point device (100). Furthermore, the invention relates to a corresponding method and system (1000).

The application provides a fog detection imaging method of active polarization fog removal and noise removal processing cooperation, laser active illumination is used to increase target surface illumination, a space gating imaging mechanism of distance gating is used to shield scattered light from a non-gating area, and the signal-to-noise ratio of target detection in a scattering medium scene is improved; for the superimposed signal of target light and scattered light collected from the gating area, a scattering imaging model based on active detection is established, a polarization fog removal algorithm under active detection is developed based on the polarization difference between the target light and the backscattering light, and the influence of the backscattering light is removed; based on the additive noise property of the forward scattering light on the image, the BM3D algorithm is used to remove the influence of the additive noise such as the forward scattering light to optimize the image, and clear imaging of the target in the thick fog scene is realized; the application uses the fusion means of the active detection mode and the polarization fog removal algorithm, and can realize the fog-transparent detection imaging with the consideration of resolution and speed in the thick fog scene.

The present application belongs to the technical field of laser ranging, and relates to a ranging system and method based on an asynchronous array single-photon detector. The system comprises a synchronous control module, an active illumination light source, a beam shaping unit, a core control module, a detection imaging system and an upper computer. The present application also proposes a ranging method based on an asynchronous array single-photon detector, which is suitable for the system. The present application can realize ranging and imaging functions by using only a single asynchronous array single-photon detector. Through the working mode of asynchronous array detection and statistical imaging, the dead time effect of the traditional single detector is dispersed to each independent pixel in the area array, thereby effectively reducing the adverse effects of the dead time on the ranging accuracy and data acquisition efficiency. In the meanwhile, the data acquisition efficiency is improved, and the ranging accuracy is further improved, which is suitable for high-speed, high-resolution ranging and three-dimensional imaging applications.

The present application relates to the field of photoelectric detection and intelligent identification, in particular to a cat-eye target detection active imaging system and method based on intelligent vision, comprising: an active illumination module for outputting a pulse laser with adjustable parameters, actively illuminating a target scene, and exciting a cat-eye effect backscatter echo of an optical device in the target scene; a coaxial imaging acquisition module for receiving the backscatter echo of the target scene and collecting information; an intelligent vision processing module for intelligently processing the received image data, outputting target information and scene perception data; an adaptive control module for constructing a closed-loop control link according to the scene perception data and the target information; a display and storage module for realizing human-computer interaction, displaying and storing real-time imaging pictures and target information. Thus, the problems of high false alarm rate, limited detection distance, poor environmental adaptability, and inability to realize target fine classification and continuous tracking in the prior art are solved.

The application discloses a kind of fast double reflection non-visual area imaging methods based on important light screening, which comprises: based on NLOS scene, calibrating sampling system, determine the size of the space to be reconstructed;Change laser light path illumination hidden space, obtain the shadow image generated by active illumination, process the shadow image based on calibration information, get the pose and shadow binary image under three-dimensional coordinates;Based on double reflection NLOS scene, light modeling is carried out, and the three-dimensional reconstruction network of shadow scene is built;The shadow binary image is sampled using a multi-resolution sampling method based on edge intensity;The shadow binary image after sampling is input into the reconstruction network for training with the pose;The shadow binary image obtained is dynamically sampled using a difference light sampling method;The three-dimensional reconstruction of NLOS dynamic scene is realized.The application realizes low delay in reflecting the dynamic change of the scene and completes the reconstruction of the moving object.

A system and method for measuring the optical phase of incident light using direct detection and for producing speckle-free images, designed for use with coherent illumination and reflective imaging geometries. Applications include speckle mitigation for active imaging, resolution enhancement using synthetic aperture methods, and digitally correcting aberrations in images or refocusing. The system hardware combines pupil-plane phase modulation with dual-plane direct-detection measurements of the image and pupil-plane intensities. The reconstruction software uses a regularized-inversion estimation framework that couples a data-fidelity model, a physics-based model for rough surface scattering of coherent light, and convolutional neural network model for natural images. The regularized inversion framework is solved iteratively using alternating projection.

Apparatuses, systems and methods are disclosed for reducing interference between an active illumination device and external radiation sources, for example, other active illumination devices operating within the vicinity. A disclosed system includes one or more active illumination devices, each configured to emit an illumination signal and also to receive a returned portion of its respective illumination signal with at least one sensor. At least one of the active illumination devices is capable of detecting interference caused by an external source, for example, an illumination signal emitted from another active illumination device. As a result of detecting the interference, the receiving active illumination device changes the timing of its subsequent illumination signals and sensor operation. By detecting collisions between illumination signals and consequently altering the timing of it operation, the active illumination device may reduce interference in congested environments where multiple active illumination devices are operating within range of each other.

Over-garment (2) for the safety and / or functional identification of a user (B) during a fire service or other rescue operation, with a textile part (4) having a neck recess (6) for attachment to the neck (N) of the user (B), with active illuminants (26) for active light emission, which are arranged on an upper side (32) of the textile part (4), with a power supply device (10) for supplying power to the active lighting means (26) and with a control device (22) for controlling the operation of the active lighting means (26), characterized in that the power supply device (10) is held adjacent to an edge (8) of the neck recess (6).

This invention provides a multi-ray coaxial laser processing monitoring device based on active illumination. The device includes a laser welding head, a monitoring module, and an auxiliary light source unit. The monitoring module includes a beam reversing unit and a monitoring unit. The beam reversing unit includes a first beam bending module, a second beam bending module, an adjustment module, a third beam bending module, and a fourth beam bending module. The fourth beam bending module is located within the laser welding head. The first beam bending module is connected to the fourth beam bending module and the second beam bending module. The third beam bending module is horizontally connected to one end of the second beam bending module via the adjustment module. The monitoring unit includes a first monitoring unit, a second monitoring unit, and a third monitoring unit. This invention achieves multi-sensor integration and, by adding an auxiliary light source, increases the imaging clarity of the visual sensor, realizing multi-ray coaxial monitoring.

The method for long-distance large-DOF multi-spectral displacement measurement of automatic compensation of deformation of measuring platform adopts multi-camera sub-region monitoring or single-camera scanning monitoring of the center change of the target to be measured to complete multi-point high-precision deformation measurement of the building; the target is designed into an active illumination target with Gaussian distribution (or other low-frequency light intensity distribution) of light intensity, the center of the target light spot is extracted by using the digital image processing technology such as feature point matching and barycentric algorithm, and the center extraction of the target center is better than 0.1 pixel; the magnification of the camera lens (fixed focus or zoom) is automatically corrected through the change of multiple light spot centers with a fixed interval of a single target; the measurement accuracy, the measurement efficiency and the reliability are improved through error compensation of six-degree-of-freedom deformation of the measuring platform.

The invention provides a nanosecond pulse laser synthesizer for laser active illumination, and relates to the field of laser, and the nanosecond pulse laser synthesizer comprises a resonant cavity which comprises a rear cavity mirror and an output mirror; the gain module is located in the resonant cavity; the pumping source is positioned in the resonant cavity; the multiple Q-switching modules are all located in the resonant cavity and located between the gain module and the output mirror, and the multiple Q-switching modules are arranged at intervals; and the time domain regulation and control module is used for controlling the Q-switching modules to be turned on and turned off in sequence, the Q value of the resonant cavity is gradually increased along with turning on of the Q-switching modules, so that the nanosecond pulse laser synthesis device outputs a plurality of sub-pulse lasers, and the sub-pulse lasers are subjected to time domain synthesis to form a pulse string or a total laser pulse. The nanosecond pulse laser synthesizer can synthesize a pulse string or total laser pulses of different waveforms through sub-pulses, and can also reduce the risk of damage to optical devices.

The application provides a single-photon single-pixel full-spectrum camera covering a visible to near-infrared band, and belongs to the field of single-photon multi-spectral imaging; solves the problems of image detail loss, spectral proportion imbalance and limited spectral resolution in the prior art; the camera is composed of a multi-spectral light emitting module, a single-photon single-pixel imaging module and a computing processing module which can be modularly integrated; the emitting module integrates multiple independently modulated pulsed lasers to realize multi-band active illumination; the imaging module uses a digital micromirror device to load a compressed sensing mask to modulate target reflected light, and records photon events in the mask; the computing processing module extracts mask measurement values based on discrete photon events, reconstructs full-spectrum and photon counting images, and realizes detail enhancement and spectral prediction in combination with a correlation optimization neural network; the application can realize high-precision imaging and spectral restoration in an extremely weak light scene, and is suitable for real-time full-spectrum imaging of a portable, unmanned and embedded platform.

The invention discloses a space cooperative target pose vision measurement system, and relates to the technical field of pose vision measurement. The invention provides a measurement system adopting a visible light passive cooperative target subsystem and a vision measurement subsystem in order to overcome the defects of an active illumination spectrum difference scheme space cooperative target pose vision measurement system. According to the system, high-performance background noise suppression, mark point extraction and pose calculation are achieved, the cooperative target subsystem is simple in structure and long in on-orbit service life, and the vision measurement subsystem can meet various space photoelectric detection task requirements. Based on the visible light passive cooperative target and the binocular vision system, real-time high-precision pose measurement of the space target is realized, the complexity and the cost of the measurement system are reduced, and the service life of the measurement system is prolonged.

The present invention belongs to the field of optical wireless communication technology, specifically, a visible light communication and position perception integrated system based on active illumination and computational reconstruction. The system of the present invention includes a light source module, a spatial light modulator, a single-pixel photodetector, a communication signal processing unit, and a control unit: the light source module is used to generate illumination light for visible light communication signals; the spatial light modulator is used to modulate the spatial distribution of the light field of the light signal; the single-pixel photodetector is used to receive the light signal modulated by the spatial light modulator and then convert it into an electrical signal; the communication signal processing unit is used to restore the original communication signal and reconstruct the spatial position information from the timing signal measured by the detector; the control unit is used to coordinate the work of the light source module, the spatial light modulator, and the single-pixel detector to ensure the synchronization and efficient operation of the system. The system of the present invention can achieve high-precision spatial positioning, with millimeter-level lateral resolution and centimeter-level longitudinal resolution.

The invention provides a polarization difference imaging method, a polarization difference imaging device, a polarization difference imaging system and electronic equipment. The polarization difference imaging method can comprise the following steps: measuring a Mueller matrix of a target scene, wherein the target scene comprises a to-be-measured object and a scattering medium environment where the to-be-measured object is located; determining an optimal illumination light polarization azimuth angle of the target scene by using the Mueller matrix of the target scene, wherein the image quality of an emergent light polarization angle image of the target scene is optimal under the active illumination condition of the optimal illumination light polarization azimuth angle; determining a backward scattering light polarization angle of the target scene under the active illumination condition of the optimal illumination light polarization azimuth angle; and obtaining a polarization difference intensity image of the target scene by using the backward scattering light polarization angle of the target scene. According to the invention, the polarization difference imaging quality can be effectively improved.