14 results about "Passive imaging" patented technology

The present invention relates to sensor apparatus and methods and storage media. Methods for low-level fusion for silicon photomultiplier based sensors, i.e., SiPM-based sensors, are provided that can include circumventing light detection and ranging sensor processing paths, i.e., LiDAR sensor processing paths, to provide high-confidence low-level fusion between camera (passive) imaging and LiDAR (active) imaging. Systems and computer program products are also provided.

The invention belongs to the technical field of multi-source heterogeneous perception and intelligent decision, and relates to a system and a method for intelligently tracking a spatial tiny target through compound eye perception guidance dynamic multi-modal fusion. The objective of the invention is to solve the problem that a low-altitude low-speed small target cannot be seen, cannot be seen clearly and is difficult to track in a complex environment. According to the invention, a multi-level closed-loop architecture with front-end enhancement, dynamic evaluation, deep fusion and online evolution is constructed. The core is that a bionic optical compound eye is reconstructed from a passive imaging device to an active enhancement and fusion guide center, and target super-resolution reconstruction is realized by utilizing the compound eye. The weight of each sensor is dynamically generated through the modal confidence evaluation network, and the deep cross-modal alignment fusion network is guided to carry out anti-interference information fusion. On-line learning and self-calibration capabilities are utilized to realize transition from static perception to dynamic intelligent disturbance rejection and have persistent evolution capability.

The invention discloses an infrared multi-mode composite imaging system based on an APD detector, and the system achieves the quick conversion of three modes through a switchable optical assembly: in a passive imaging mode, the detector receives a thermal radiation signal emitted by a target; in the active gating mode, a laser is utilized to irradiate a target, and set target depth-of-field imaging is realized by controlling a time window of a detector; in the active 3D imaging mode, a time flight method is used, and distance information of a target is obtained by emitting laser and receiving reflection echoes of the laser. Meanwhile, a double-layer fusion framework based on adaptive weight is designed, spatial distance information in an active 3D imaging mode is coded to a chrominance channel in a YCbCr color space, heat radiation information and object contour details in a passive infrared mode are coded to a brightness channel, and an image fusing two-dimensional heat information and three-dimensional space information is output.

This invention discloses a terahertz receiver and a focal plane camera device based on a variable capacitor. The receiver includes a connected zigzag inductor and interdigitated capacitors; each finger of the interdigitated capacitor is composed of closely arranged double-cross-shaped repeating units, enabling it to efficiently absorb terahertz waves without the need for an additional absorber. Terahertz radiation changes the dielectric constant of the dielectric, causing changes in capacitance and resonant frequency; detection is achieved by detecting these changes. The focal plane camera device includes an array of the aforementioned receivers. Each receiver is coupled to a zigzag-shaped center feed line via a coupling feed line, and each unit has a different resonant frequency, achieving frequency division multiplexing readout. This invention combines absorption and resonance functions into one, greatly simplifying the structure, achieving high absorption efficiency, possessing dual polarization and intrinsic frequency division multiplexing capabilities, and easily expanding into large arrays. It can be widely applied in fields such as high-sensitivity terahertz passive imaging and spectral analysis.

The application discloses a kind of single-photon laser active-passive imaging detection radars, comprising: laser emission module, laser ranging receiving module, focal plane imaging detection receiving module, timing control and ranging signal processing module, active-passive imaging data separation module, data processing module;Laser ranging acceptance module accepts the laser echo signal of target reflection, and target distance calculation is completed by the timing control and signal processing module;The focal plane imaging detection receiving module is based on the periodic pulse string gate signal that the timing control and signal processing module emit, in the mth measurement period, active reception and processing of echo signal are completed, and passive reception and processing of n-1 measurement periods are completed;The active-passive imaging data separation module realizes the separation of active imaging detection data and passive imaging detection data;And by data processing module, according to preset data processing algorithm processing, corresponding target active imaging and target passive imaging are obtained.

The invention relates to a wide-width multi-angle visible light laser active and passive integrated aerial survey load. The load comprises a visible light imaging module, a near-infrared imaging module, a laser radar, a positioning and attitude determining system (POS) and a camera body supporting structure. Wherein the passive imaging module comprises a visible light imaging module and a near-infrared imaging module, the visible light imaging module is formed by splicing three cameras, and wide images are synchronously obtained in single flight. The laser radar is an active imaging module, and obtains a large amount of laser point cloud data by actively emitting laser. The laser radar module and the wide imaging module are systematically integrated, the laser radar, the visible light camera and the near-infrared camera work cooperatively under the condition that the field of view is overlapped, laser point cloud data can effectively compensate for image elevation errors, the problem of accuracy loss caused by single-dimensional splicing is solved, multiple application modes are achieved, and the application range is wide. And large-area terrain, landform and urban landscape information can be efficiently obtained.

This invention discloses a dispersion compensation method and system for broadband imaging using a passive liquid crystal optical phased array. Dispersion parameters are obtained by calibrating the dispersion length and overall translation at different orders using a point source. The field of view is electrically deflected at different grating orders to acquire passive observation images. The dispersion process during diffraction is modeled, and an imaging matrix is ​​constructed based on a forward model. Compressed sensing reconstruction is solved using sparse priors as regularization terms to directly reconstruct a high-dimensional data cube of the entire field of view. After reconstruction, the entire field of view scene reconstruction result is directly projected downwards to obtain the reconstruction result of the scene during a scanning process. Field clipping is performed on the multi-order reconstruction results to obtain imaging results of different fields of view at different scanning angles. This invention significantly suppresses dispersion blurring along the deflection direction without changing the physical aperture and pixels of the passive liquid crystal optical phased array, improving the clarity and resolution of passive imaging. It is applicable to broadband passive scenes such as 380–760 nm visible / near-infrared.

The present disclosure provides an infrared optical system for active and passive composite detection, and relates to the field of photoelectric detection, which comprises a shell, an infrared imaging mechanism comprising an infrared frame and an infrared lens group, the infrared frame is arranged in the shell, the infrared lens group is arranged in the infrared frame to form an infrared channel, and the infrared lens group is used for passive imaging of a target object; a laser detection mechanism comprising a laser frame and a laser lens group, the laser frame is arranged in the infrared frame in a separable manner, the laser lens group is arranged in the laser frame to form a laser channel, and the laser lens group is used for measuring the angle and distance of the target object; wherein the laser lens group and the infrared lens group are arranged eccentrically. The laser infrared composite detection optical system has the effects of small volume, light weight and low manufacturing cost.

The invention discloses a dispersion compensation method and system for wide-spectrum imaging of a passive liquid crystal optical phased array. Using a point source to calibrate dispersion lengths and overall translation of different orders to obtain dispersion parameters; performing electric control deflection on the view field under different grating orders to obtain a passive observation image; modeling a dispersion process in a diffraction process, constructing an imaging matrix based on a forward model, solving compressed sensing reconstruction by taking sparse prior as a regular term, and directly reconstructing a full-view-field high-dimensional data cube; after reconstruction is completed, direct downward projection is carried out to obtain a full-view-field scene reconstruction result in a scanning process; and performing field-of-view cutting on the multi-order reconstruction result to obtain imaging results of different fields of view under different scanning angles. On the premise that the physical caliber and pixels of the passive liquid crystal optical phased array are not changed, dispersion blurring in the deflection direction is remarkably restrained, the passive imaging definition and resolution capacity are improved, and the method is suitable for 380-760 nm visible / near-infrared wide-spectrum passive scenes and the like.

The invention provides a single-photon analog domain front-end circuit for an event-driven visual sensor, and relates to the technical field of digital-analog hybrid integrated circuits. The single-photon analog domain front-end circuit comprises an analog counting sub-circuit which is used for responding to reflected photons of a target scene in a preset time window, generating digital pulses and converting the digital pulses into a first voltage signal and a second voltage signal; the event-driven visual sensor unit is used for storing the first intensity value, subtracting the first intensity value from the second intensity value and outputting the intensity difference of adjacent frames; the high-low threshold comparator is used for comparing the intensity difference with a high threshold voltage and a low threshold voltage respectively to generate an event judgment signal; the output buffer is used for performing level shift processing on the event judgment signal and outputting an image; and the ADC unit is used for quantizing the second voltage signal into a digital signal. Therefore, on-chip resource consumption is low, the reading rate is high, and the defect that imaging is blurred when a high-speed moving object is recorded through traditional passive imaging is overcome.

The present application relates to the field of passive microwave millimeter wave imaging detection, and particularly relates to an interferometric passive microwave imaging system and method based on array beam forming, wherein the array beam forming comprises phased array beam forming and digital beam forming, and the data after array beam forming will be used to complete imaging detection by the interferometric passive microwave imaging method. A plurality of antenna units form a phased subarray, and the phased array beams formed by all the phased subarrays are directed in the same direction. A plurality of phased subarrays form a digital subarray, and the digital subarray generates digital beams within the phased array beam pointing range. A plurality of digital subarrays form an interference array, each digital subarray acts as a unit to participate in the interferometric correlation operation of the interference array, and the interference array completes the interferometric passive microwave imaging within the digital beam range.

This application discloses a target recognition system and method based on hybrid active-passive imaging. On one hand, it encodes waveforms of multiple echo signals acquired by multiple millimeter-wave radars using a first convolutional neural network to obtain multiple first feature matrices, and constructs these first feature matrices into a three-dimensional first feature map along the channel dimension. On the other hand, it encodes multiple images acquired by multiple cameras using a second convolutional neural network to obtain second feature matrices, and arranges these second feature matrices along the channel dimension to construct a three-dimensional second feature map. Then, it fuses the first and second feature maps to identify the target. This system integrates active imaging from multiple millimeter-wave radars and passive imaging from multiple cameras to perceive the target from different perspectives, thereby improving the accuracy of target recognition.

The application provides a passive infrared imaging system based on parametric up-conversion, and relates to the technical field of infrared detection, and comprises: a pump laser for outputting pump light; a thermal radiation modulation assembly for receiving and modulating the radiation light of an object to be imaged and outputting modulated signal light to a back-wall mode microcavity chip; an optical filter; a photoelectric detector for detecting the output signal of the back-wall mode microcavity chip to generate light intensity information; the back-wall mode microcavity chip generates up-conversion light; a control and calculation imaging module for controlling the modulation process of the thermal radiation modulation assembly and receiving corresponding light intensity information, so as to obtain single-pixel up-conversion light intensity information and perform infrared image reconstruction. The application realizes high-sensitivity passive imaging of far-infrared spontaneous radiation light in an object at room temperature, and has the advantages of high integrability and imaging not affected by the size of a detector array.

The application provides a single-photon analog domain front-end circuit for an event-driven vision sensor, and relates to the technical field of digital-analog hybrid integrated circuits. The single-photon analog domain front-end circuit comprises: an analog counting sub-circuit, which is used for generating a digital pulse in response to reflected photons of a target scene within a preset time window, and converting the digital pulse into first and second voltage signals; an event-driven vision sensor unit, which is used for storing a first intensity value, subtracting the first intensity value from a second intensity value, and outputting an intensity difference of adjacent frames; a high-low threshold comparator, which is used for comparing the intensity difference with a high threshold voltage and a low threshold voltage respectively, and generating an event decision signal; an output buffer, which is used for performing level shift processing on the event decision signal, and outputting an image; and an ADC unit, which is used for quantizing the second voltage signal into a digital signal. In this way, on-chip resource consumption is small, readout rate is high, and the defect of imaging blur when recording high-speed moving objects in traditional passive imaging is overcome.