122results about How to "Real-time imaging" patented technology

The present invention provides a digital imaging photodetector with a gas electron multiplier. The digital imaging photodetector comprises a gas electron multiplier detector. The gas electron multiplier detector includes a photoelectric converter for converting incident light into photoelectrons or Compton electrons; a gas electron multiplier (GEM) for receiving the photoelectrons or Compton electrons from the photoelectric converter and multiplying them; and a readout unit for receiving an electrical signal indicating a position where an electron cloud multiplied in the gas electron multiplier arrives on an anode, recognizing coordinates of the electron cloud based on the received signal, and outputting the coordinates of the electron cloud. According to the digital imaging photodetector of the present invention, real-time imaging of image information can be achieved by multiplying photoelectrons or Compton electrons, which are discharged due to a photoelectric effect or a Compton effect induced by visible rays, ultraviolet rays or X-rays, using the gas electron multiplier.

It is provided an ophthalmic optical coherence tomography system in the invention, the system comprising: an OCT interferometer primary module and a sample arm module, wherein the OCT interferometer primary module comprises an OCT light source, a fiber coupler, a reference arm, a detection module, an X-direction scanning unit, and a Y-direction scanning unit; the sample arm module comprises an anterior eye segment imaging module and a posterior eye segment imaging module; the Y-direction scanning unit is rotatable; when the Y-direction scanning unit is at a first rotation angle, the Y-direction scanning unit reflects the light received by the X-direction scanning unit into the anterior eye segment imaging module; and when the Y-direction scanning unit is at a second rotation angle, the Y-direction scanning unit reflects the light received by the X-direction scanning unit into the posterior eye segment imaging module. It is further provided a method for quick switching to realize anterior and posterior eye segments imaging in the invention, in which imaging at one time and quick switching for locations at different depths can be realized, and on this basis, the eye axial length can be measured accurately.

The invention provides a new passive synthetic aperture photonic imaging method and system, which may realize the high resolution real-time imaging detection of microwave, millimeter wave and terahertz waveband, pertains to an interference imaging remote sensing, high space resolution military detection technical field. In the invention, different from the conventional passive synthetic aperture imaging, which through the combination operation of both correlated antenna and discrete Fourier conversion method for reconfiguring the target image, after the vision radiation signal received and down conversion, through an electro-optical amplitude modulation, upload the phase position information to the light wave, combine with the redundancy spacing correction (RSC) to realize the high accuracy phase compensation, and form an array through the optical fiber transmission, finally with the optical synthetic aperture technology, directly recover the vision images in real-time through an optical system.

A full-eye optical coherence tomography imager comprises a frequency sweeping light source, an optical fiber polarizer, a first optical circulator, a second optical circulator, a first broadband polarization splitting prism, a second broadband polarization splitting prism, an ocular anterior segment scanning imaging light path, an eye ground scanning imaging light path, a third broadband polarization splitting prism, two reference mirrors, a fourth broadband polarization splitting prism, a fifth broadband polarization splitting prism, a second polarized light protecting coupler, a third polarized light protecting coupler, a first balance detector, a second balance detector, a function generation card, a data acquisition card, a computer and the like, wherein the first broadband polarization splitting prism, the second broadband polarization splitting prism, the ocular anterior segment scanning imaging light path and the eye ground scanning imaging light path are arranged in a sample arm; the third broadband polarization splitting prism and the two reference mirrors are arranged in a reference arm; the fourth broadband polarization splitting prism, the fifth broadband polarization splitting prism, the second polarized light protecting coupler, the third polarized light protecting coupler, the first balance detector and the second balance detector are arranged at a detecting end. The imager is based on a frequency sweeping optical coherence tomography technology, a component p and a component s of a polarized beam are used for conducting imaging on an eye ground and an ocular anterior segment respectively, and thus three-dimensional high resolution real-time imaging can be conducted on an full eye structure at the same time on the same system without any device for conversion. By means of the full-eye optical coherence tomography imager, optical path length and dispersion matching and scan setting can respectively be carried out on ocular anterior segment imaging and eye ground imaging, and thus the optimal imaging quality and the view field size of ocular anterior segment imaging and eye ground imaging can be obtained at the same time.

The invention discloses a gamma camera which comprises a first gamma imaging unit and a second gamma imaging unit, wherein the first gamma imaging unit comprises a first coding plate provided with a first pattern formed by a plurality of coding elements and a first detector for detecting a radiation ray penetrating through the first coding plate; the second gamma imaging unit comprises a second coding plate provided with a second pattern formed by a plurality of coding elements and a second detector for detecting the radiation ray penetrating through the second coding plate; and the first pattern and the second pattern form opposite patterns. In addition, the invention also discloses a method for detecting the radiation ray by utilizing the gamma camera. As the two coding plates and the two detectors are used in the gamma camera, two groups of projection data under opposite and reverse modes can be simultaneously acquired and simultaneously transmitted to a data processing unit for image reconstruction to realize real-time imaging, so that the coding and imaging speed under a patrol inspection mode is improved, and the purpose of quickly positioning a radiation source is achieved.

The invention discloses a high speed single-pixel imaging method which comprises the following steps: generating a series of binarized Fourier-based patterns for approximately representing multi-gray level Fourier-based patterns, then modulating a wave field emitted by a wave source by means of a high speed spatial wave field modulator according to the binarized Fourier-based patterns to generate a series of different wave fields modulated in a space; irradiating the wave fields successively to a target object through a projection system according to different frequencies and different initial phases, forming interaction between irradiating waves and the target object to generate interaction signals, and synchronously and successively measuring the interaction signals by means of a single-pixel detector; calculating Fourier transform spectrum coefficients of the frequency for measured values of a plurality of wave fields of different initial phases of a same frequency by means of a detector so as to obtain a series of Fourier transform spectrum coefficients; and finally performing Fourier transform on the Fourier transform spectrum formed by the Fourier transform spectrum coefficients of all frequencies or part of frequencies to obtain a target object image.

The invention discloses a millimeter wave detection method and millimeter wave detection device, belonging to the technical field of coherent detection of millimeter wave and terahertz. The method comprises the following steps: enabling a to-be-detected microwave to irradiate on an atom sample pool, and converting millimeter wave coherence into visible light signals through six-wave mixing; measuring the visible light signals to obtain amplitude and phase of the millimeter wave, thereby realizing high-sensitivity millimeter wave coherence detection. The method and the device are based on a quantum interference principle and a Rydberg atom six-wave mixing technology, convert the millimeter wave coherence into the visible light signals in an atom air chamber, and realize high-sensitivity detection of the millimeter wave through detection of visible light; and the method can obtain the detection sensitivity approximate to single photon level, realizes millimeter wave and terahertz real-time imaging of which spatial resolution is subwavelength magnitude, and provides new technical basis for precise detection of the millimeter wave and the terahertz.

The invention provides a billion-pixel virtual reality video collection device, system and method. The device comprises an unstructured camera array, a supporting part, a camera holder and a camera rack, wherein the camera array comprises at least five columns of camera column combinations which are distributed in a fan shape, each camera column combination comprises a binocular camera and at least one local camera, each binocular camera is composed of two global cameras as a group, and the focal length of each local camera is adjustable; the supporting part is used for supporting the camera holder, and the camera holder is connected with the camera rack; and the camera rack is used for respectively fixing each column of camera column combination in the camera array through a connecting part. A panoramic 360 virtual reality collection device with a self-adaptive unstructured structure is used; and embedding an RGB image in the video data of the local camera into the panorama, so that auser can zoom in a visual angle to observe detail information of the area of interest.

The present invention discloses a hard-tube common-path type endoscopic OCT parallel imaging method and system. Said invention adopts Green rod lens with integer multiple cyclic length as endoscopic probe light-transferring device, uses column lens to implement linear focusing illumination of internal cavity wall, and utilizes face-matrix CCD detector to make detection of the spectral field signal. The font end face of the Green rod lens is placed on the rear focal plane of column lens, the integer multiple cyclic length can ensure that the light-beam form transferred to rear end face is identical to that incident upon front end face, so that the rear end face com be used as reference face, it and sample have conjugate imaging relationship, both they can be formed into a common-path sensitive interferometer. Said invention utilizes the combination of linear illumination parallel imaging technique and spectral field detection technique to obtain two-dimensional image of internal cavity wall.

A scan imaging device for the water object includes the laser in the shell with the transparent window under the water, the laser shot device composed by the extender lens, the plano-concave cylinder lens and the holophote, the receiver in the shell with transparent window and the image processing unit in the water. The electropult and the receiver are separately in the same base plane. The emitting optical axis, the receiving optical axis of the adjusted receiver and the object center are in the same plane. It is loaded on the robot or the ship in the water by the diver and generates the standard image signal to get the clean image. So it can be used for the military and the scientific research.

The invention discloses a correction method and system of sweep frequency OCT digital phases based on information on static regions. Desynchrony in sweep-initiating of a swept source and sampling clock signals, and random offset of an interference signal spectrum presented in conventional swept source optical coherence tomography may give rise to random jumping of OCT phase signals. The research shows that in the static regions of a sample, phase noise decided by a system SNR is lower as compared with a phase jumping error while environment-induced phase disturbance in the time domain has the feature of slow variation. By utilization of the above phase features, A-line positions where phase jumping occurs and offset amount of the spectrum are determined. By means of a linear relation between phase and imaging depth, correction of phase jumping errors can be achieved. The method belongs to pure digital correction without increase in complexity of the system and introduction to extra phase noise.

The invention discloses a photoacoustic microscopy imaging-based quantitative detection device for a nevus flammeus blood vessel. The device comprises two parts, namely hardware and software, wherein the hardware comprises a light emitting system, an optical rapid scanning system, a photoacoustic detection system, an X, Y and Z-axis motor positioning system and a host computer system; the software comprises driving, deconvolution and filter back-projection algorithms of various hardware, and three scanning imaging modes; the imaging depth of the device is 2mm; the transverse resolution is 3.8mu m; the axial resolution is 40mu m; the imaging range is 0.5mm or 1mm; the problem that a pure optical method cannot reach the imaging depth, and ultrasound cannot reach the resolution are solved; two-dimensional and three-dimensional structure imaging is adopted, so that the parameters such as pipe diameter and depth of the blood vessel, and relative blood volume percentage distributed along the depth direction can be quantitatively counted; the defects and disadvantages in an existing clinical PWS detection technology are solved; and a non-destructive real-time multi-mode detection method is provided for PWS pathological study.

The invention belongs to the field of a radar imaging technology, and discloses a compression perception multilayer ISAR imaging method based on BP optimization, for mainly solving the problems of noise sensitivity, high single-layer compression perception optimization time complexity and difficult sparse control parameters by use of conventional ISAR imaging. The specific realization process is as follows: preprocessing original echo data; determining an orientation resolution step factor sigma; initializing an encoding matrix M1 and a decoding matrix W2; performing training by use of a BP algorithm to optimize an encoding process and a decoding process; reconstructing an ISAR image by use of a compression perception theory; performing reverse Fourier transformation on orientation, and inputting obtained echoes into a next layer, and carrying out the training by use of the same principle; and outputting a high-resolution ISAR image at a final layer. According to the invention, the convergence speed is fast, high-resolution imaging can be realized under the conditions of a low signal-to-noise ratio and a small echo quantity, and the method can be applied to classification and identification of ISAR image objects.

The invention discloses a diagnosis and treatment integrated ultrasonic system based on a cMUT (capacitive micromachining ultrasonic transducer) area array. The diagnosis and treatment integrated ultrasonic system comprises an ultrasonic imaging diagnosis device, an ultrasonic focusing treatment device and a probe; the probe comprises an area array formed by taking the cMUTs as array elements, each array element is connected with the ultrasonic imaging diagnosis device and the ultrasonic focusing treatment device, and the probe is used for working in an imaging diagnosis mode and / or focusing treatment mode. The diagnosis and treatment integrated ultrasonic system integrates ultrasonic imaging diagnosis and ultrasonic focusing treatment and has multiple advantages of wide broadband, high sensitivity, small size, low noise, easiness in acoustic impedance matching, wide working temperature range and the like.

The invention discloses a compact monocular multi-channel configurable multispectral imaging system, which comprises an optical lens interface for fixing the optical imaging lens; a composite beam splitter prism composed of three or more prisms glued together; a optical filter interface provided with three or more interfaces, wherein the interfaces are respectively used for fixing optical filter modules with different spectral bands so as to generate spectral information of different spectral bands; three or more groups of low spatial high spectral resolution sensors and high spatial low spectral resolution sensors used for performing photoelectric conversion on the spectral information to generate an electric signal; and an image acquisition processing system comprising an image processing module, an optical filter identification module, a memory, an information superposition module and an analysis module.

The present invention provides a digital imaging photodetector with a gas electron multiplier. The digital imaging photodetector comprises a gas electron multiplier detector. The gas electron multiplier detector includes a photoelectric converter for converting incident light into photoelectrons or Compton electrons; a gas electron multiplier (GEM) for receiving the photoelectrons or Compton electrons from the photoelectric converter and multiplying them; and a readout unit for receiving an electrical signal indicating a position where an electron cloud multiplied in the gas electron multiplier arrives on an anode, recognizing coordinates of the electron cloud based on the received signal, and outputting the coordinates of the electron cloud. According to the digital imaging photodetector of the present invention, real-time imaging of image information can be achieved by multiplying photoelectrons or Compton electrons, which are discharged due to a photoelectric effect or a Compton effect induced by visible rays, ultraviolet rays or X-rays, using the gas electron multiplier.

The invention relates to the technical field of organic synthesis and novel materials and particularly relates to a near-infrared fluorescent compound with AIE performance as well as a preparation method and application thereof. According to the fluorescent compound, indole salts are used as receptors; a pyrrole donor and donors introduced with different conjugated structures in a site 2 and a site 5 of pyrrole are used for effectively regulating and controlling fluorescence emission of molecules; groups in a site 1, the site 2 and the site 5 are used for forming certain distortion with a pyrrole ring, so that the AIE performance is given to the compound; because of D-Pi-A actions in the molecules, the molecules can achieve long-wave-band light emission; the light emission wavelength is between 600 and 750nm and has greater Stokes shift. According to the fluorescent compound, the indole salts are used as targeting groups; the fluorescent compound is capable of achieving targeting imaging of mitochondria in various cells, has the advantages of washing-free property, low biotoxicity and high photobleaching resistance and the like in the imaging process, and is also capable of monitoring dyeing of the mitochondria in real time.

The invention discloses a wireless voice-operated wearable molecular imaging navigation system, comprising a multi-spectrum light source signal transmitting and receiving module, used for transmitting visible light and near infrared to a detection area and collecting a visible light image and near infrared fluorescent image of an imaging object; an image processing module, used for fusing the collected visible light image and near infrared image and capable of three-dimensionally reconstructing a multi-source information; a wireless signal processing module, used for autonomously building or connecting a wireless network signal; a wearable imaging module, used for collecting and displaying video information and receiving and transmitting voice and capable of intelligently sensing changes in head posture to control the system. According to embodiments of the invention, equipment is effectively intelligentized in the application of molecular imaging systems, and the applicable scope of optical molecular imaging navigation is effectively extended.

The invention relates to a preparation method for a carbon quantum dot fluorescent probe used for detection of the concentration of nitric oxide in organisms. The carbon quantum dot is a powdery solidwith excellent water solubility, is synthesized from citric acid and L-cysteine through a microwave-assisted method, and has extremely high quantum yield which is up to 85%. The preparation method for the carbon quantum dot comprises the following steps: 1) dispersing and dissolving the citric acid and the L-cysteine in deionized water; 2) carrying out stirring and ultrasonic dispersion, and allowing the citric acid and the L-cysteine to be uniformly dispersed in a solution; 3) transferring a mixed solution into a microwave oven, and carrying out heating for 2 to 8 min; 4) carrying out cooling to a room temperature, adding water, and carrying out dissolving; 5) transferring an obtained solution into a centrifuge, and carrying out centrifuging at a high speed; and 6) subjecting a centrifuged solution to filtering and drying operations so as to prepare the carbon quantum dot. The carbon quantum dot prepared by using the method provided by the invention has the advantages of high fluorescence quantum yield, good chemical stability, photobleaching resistance and biological compatibility, and applicability to detection of the concentration of the nitric oxide in the organisms.

The present invention provides a close distance microwave imaging method and system. The rotation of a linear array antenna formed by the preset number of antennas around a preset arc track is controlled to scan a target area, the linear array antenna is controlled to collect the preset number of echo data at the position point of each azimuth on the arc track, and the echo data formed by the preset number of the echo data is sent to a signal processing device until the preset azimuth position point of the linear array antenna on the arc track completes the collection of the echo data; and once the signal processing device receives the echo data set, the echo data set is subjected to image processing so as to effectively improve the processing speed of the close distance microwave imaging, shorten the processing time and realize the real-time imaging.

The invention discloses a quasi-static ultrasonic elastography displacement calculation method so as to solve the technical problems that linkage is mistaken and two-dimensional cross-correlation research calculated quantity is excessively large due to iteration in the prior art.The embodiment of the invention further provides a corresponding device.According to the feasible embodiment, the method comprises the steps of calculating a central point for any displacement, and utilizing prior time shifting for building an iteration cross-correlation function based on a neighborhood window for iteration cross-correlation calculation; obtaining a cross-correlation reliability exponential value of iteration cross-correlation calculation, and judging whether the cross-correlation reliability exponential value is smaller than a first credible threshold value or not; if the cross-correlation reliability exponential value is larger than or equal to the first credible threshold value, determining transverse time shifting according to the prior time shifting, and determining longitudinal time shifting according to the prior time shifting and an iteration cross-correlation result; if the cross-correlation reliability exponential value is smaller than the first credible threshold value, using two-dimensional comprehensive cross-correlation research inside the neighborhood to obtain the longitudinal time shifting and the transverse time shifting of the central point of displacement calculation; traversing all ultrasonic radio-frequency signals, and generating displacement field distribution of tested biological tissue.

The invention discloses a phase object phase distribution quantitative measurement method and a phase object phase distribution quantitative measurement device as well as application of the method and the device. According to the method, the parallel light is projected on a phase object, and a bright field image of the phase object is obtained through an imaging lens; in the direction of light beams, a filter is placed on the frequency spectrum surface behind the imaging lens for absorbing the zero-level frequency spectrum of the object, and a dark field image of the phase object is obtained; and according to information carried by the two images and the theoretical expression of the image light intensity, the bright field image and the dark field image are analyzed by the image processing technology, the phase value of each point of the phase object is obtained, and the phase distribution or image of the phase object is reconstructed. The device for realizing the method is characterized in that a light source, a beam expanding lens, a pinhole filter, a collimating lens, a device for placing the phase object, an imaging lens, the filter used for absorbing the zero-level frequency spectrum of the phase object and an area array photoelectric detector are sequentially arranged in the advancing direction of light beams. The method, the device and the application have the advantages that the quantitative measurement of the phase object is realized, the phase measuring range is 0 to pi, the device is simple, and the cost is low.

The invention relates to design synthesis and application of a near-infrared two-window fluorescence probe based on Aza-BODIPY, and belongs to the field of organic fluorescence probes. A near-infraredtwo-area dyestuff (NIR-II, 1000-1700nm) has a long emission wavelength and less light scattering and tissue autofluorescence interference so as to obtain better resolution ratio and imaging depth inbioimaging. An Aza-BODIPY fluorescent dye has a longer absorption emission wavelength, a narrower peak width at half height and a larger molar extinction coefficient, and is widely applied to the fields such as photodynamic therapy. The structural formula of the near-infrared two-window fluorescence probe designed and synthesized by the invention is as shown in the figure (I). According to the probe, electron-donating group julolidine is introduced onto the classic Aza-BODIPY structure, and the molecular rigidity is improved. The probe has excellent light stability and a capacity of resistingdisturbance. The probe successfully realizes near-infrared two-window imaging during the mice imaging experiment.

Provided is a head-mounted micro light sheet microscope. A probe emits a light sheet to excite an object to be measured, and collects a fluorescence signal produced by the object to be measured according to an emitted light sheet signal to obtain the fluorescence imaging information of the object to be measured. The imaging probe can be fixed to the head of a free moving animal. The object to be measured is excited by the light sheet, and fluorescence is collected in a direction perpendicular to the light sheet to carry out imaging. Light sheet scanning is used to replace the point scanning imaging mode featuring slow imaging. During excitation of the object to be measured, the light sheet has good optical layer selection capability and large excitation area. Therefore, the imaging speed and the signal-to-noise ratio are improved, and the light toxicity is reduced. The head-mounted micro light sheet microscope is suitable for long-time living imaging. A high-contrast image can be obtained. Real-time imaging of the brain of a free moving animal is realized.

The invention discloses a waterless coupled fast linear confocal scanning photoacoustic probe and an imaging method. The photoacoustic probe comprises a casing, a fiber collimator, a galvanometer, a flat field scanning lens, a hollow two-dimensional translational adjustment frame,an ultrasonic coupler and an ultrasonic transducer; laseremitted from an optical fiber is collimated by the fiber collimator, reflected by the galvanometer, and then injected into the flat field scanning lens, the hollow two-dimensional translational adjustment frameand the ultrasonic coupler to reach a sample. Afterthe sample absorbs light, an acoustic signal is generated, and the acoustic signal is converted into an electrical signal by the ultrasonic transducer,transmitted to a computer processing system, andthen subjected to rapid image reconstruction through a GPU to achieve real-time imaging. The method has the advantages thathigh resolution is ensured by point excitation, fast linear confocal scanningdetection is achieved, and a waterless coupled device can achieve better effects in the application ofmatched photoacoustic microscopy instruments.

The invention provides a leaf-shielding-resistant CIM real-time imaging method for detecting abnormal parking of a shared bicycle, and the method comprises the steps: constructing a CIM of a target region which comprises a region of interest and other regions; processing the acquired image to obtain an adaptive occlusion image and leaf occlusion prompt information; sending the adaptive occlusion image into two branches, obtaining an image coordinate of a handlebar center point through the first branch, projecting the image coordinate into the CIM, and combining the image coordinate with the position information of the region of interest to obtain a shared bicycle abnormal parking detection result; enabling the second branch to perform projection transformation on the input self-adaptive occlusion image, and projecting the image into the CIM to realize real-time imaging after being spliced; and sending a detection result to the CIM for storage, performing visualization processing by using a Web GIS technology, and displaying the CIM of the target area at a Web end. According to the method, the utilization rate of information collected by the camera is improved, and related personnelcan be reminded to take measures in time when leaves shield the camera.

A device for performing real-time imaging by means of a spatial chirped terahertz pulse is used for realizing terahertz real-time imaging of an object. The device comprises the components of a laser; a light splitting device which is used for splitting laser that is generated by a laser device into a first beam and a second beam; a pulse optical path unit which receives the first beam and comprises a semiconductor antenna, a pair of silicon prisms which are arranged in a non-overlapped manner, an imaging lens, and electro-optical crystal which is used for receiving light that penetrates through the imaging lens, wherein the semiconductor antenna, the pair of silicon prisms, the imaging lens and the electro-optical crystal are successively arranged in an optical path; a detecting optical path unit which receives the second beam and comprises a high-reflectivity lens set and a reflector member, wherein the high-reflectivity lens set and the reflector member are successively arranged in the optical path and are used for time delay, wherein the reflector member is arranged between the imaging lens and the electro-optical crystal and is used for combining the reflected light and the light that penetrates through the imaging lens and illuminating the combined light to the electro-optical crystal; and a signal acquiring and processing unit which is connected with the electro-optical crystal and acquires the signal on the electro-optical crystal and performs processing for obtaining a terahertz image of the object, wherein the object is placed between the silicon prisms and the imaging lens.

The invention discloses an intelligent Wi-Fi imaging method and system based on a field programmable meta-material. An intelligent Wi-Fi imaging system based on a field programmable meta-material is built by adopting a Wi-Fi router, a reference receiver, a main receiver and an electric control field programmable meta-material with a working frequency band covering a Wi-Fi frequency band. The method comprises the steps that: a Wi-Fi signal is directly used for detecting a target, electromagnetic waves do not need to be actively emitted to the target, and a deep learning method is used for achieving long-distance and non-line-of-sight real-time imaging on the target. The intelligent Wi-Fi imaging method and system can achieve long-distance and non-line-of-sight real-time imaging, and have the characteristics of low cost, high efficiency and the like.

The embodiment of the invention discloses a data processing method and apparatus for a foundation synthetic aperture radar, an electronic device, and a computer readable medium. The foundation synthetic aperture radar is constructed by causing a foundation radar to perform rectilinear motion along a rail. A plurality of virtual array element positions are arranged on the rail. A specific implementation manner of the method comprises the following steps: in response to determination of location at the virtual array element position at present, transmitting a frequency modulated continuous wavesignal to a monitored point target through a transmitting antenna; obtaining echo data of the monitored point target by using a receiving antenna; and in response to determining a terminal located onthe rail at present, processing the obtained echo data based on an imaging algorithm of a pseudo-polar coordinate system to generate a focusing image of the monitored point target. According to the embodiment, by adoption of the imaging algorithm of the pseudo-polar coordinate system, an interpolation process can be avoided, thereby being conducing to improving the processing efficiency of the data and realizing real-time imaging.

The invention discloses a smart city CIM imaging method based on pedestrian activity and density perception. The method comprises the following steps: constructing a city information model of a three-dimensional digital space; performing pedestrian labeling; training a pedestrian key point extraction network; superposing the pedestrian key point thermodynamic diagrams of the continuous frames, training a camera refresh rate grading network by using an added thermodynamic diagram result, performing pedestrian key point detection network processing, superposing and camera refresh rate grading network processing on the continuous image frames acquired by the camera in real time, and outputting a camera real-time refresh rate grade; adjusting the refresh rate of the camera in real time according to the real-time refresh rate grade of the camera, collecting images, splicing the images, and visually displaying the city information model on a Web page. According to the invention, intelligentsmart city image acquisition is realized, pedestrian detection and analysis precision is improved, camera power consumption is reduced, and model visualization results are richer.