34results about How to "Imaging results are good" patented technology

The invention discloses an MEG system and method based on an atom magnetometer. A design scheme of an EMG capable of being freely detached in practical operation is provided to insulate heat and prevent extra magnetic field interference during the practical use. A gyroscope is added to all or representative magnetometers to acquire magnetometer directions; a great system is caused when plenty of magnetometer arrays are added to a brain magnetic hat; due to technical reasons and economic factors, a method for integrally processing optical signals is provided, so MEG spatial resolution can be improved, technological difficulties can be reduced and great economic effects can be achieved.

The invention discloses a motion compensating method applicable to high-speed-mobile-aircraft-mounted SAR (synthetic aperture radar) imaging. The motion compensating method includes: establishing a motion error model applicable to high-speed-mobile-aircraft-mounted SAR imaging according to characters of high-speed-mobile-aircraft-mounted SAR imaging; on the basis of the model, analyzing influence on SAR imaging from an inertial navigation error; after distance-direction processing and initial direction Deramp processing are finished, utilizing inertial navigation information and combining with Doppler frequency estimation to obtain residue Doppler frequency modulation information of an echo, utilizing the obtained residue Doppler frequency modulation information to construct a corresponding compensating function to reasonably compensate an error phase, and thereby focusing quality of high-speed-mobile-aircraft-mounted SAR images is effectively improved.

The invention provides a dual-station SAR receiver kinematic error compensating method based on navigation satellite signals. The method includes the steps of establishing a Doppler rate and kinematicerror relation model, estimating and compensating for receiver method planar kinematic errors, and estimating and compensating for receiver cruise direction kinematic errors. The method has the advantages that according to the structural characteristics of a dual-station SAR based on the navigation satellite signals, the method based on the instantaneous Doppler rate is put forward to correct thekinematic errors of a receiving platform; the real model of three-dimensional movement errors is sufficiently considered in the method, and the kinematic error estimating and compensating can be effectively conducted; no interpolation or iteration treatment needs to be conducted in the method, the processing efficiency is high, and a good imaging result is obtained.

A method of optics close distance correction is provided, which comprises the following steps: providing at least a circuit figure to be exposed; forming at least one assistant figure to be exposed perpendicular to the circuit figure to be exposed, the dimension of the assistant figure to be exposed is less than the resolution of the lithography machine; transferring the circuit figure to be exposed and the assistant figure to be exposed to the photomask, so as to form the circuit figure and the assistant figure. Through the steps, not only the assistant figure on the photomask perpendicular to the circuit figure can be reflected on the semiconductor underlayer, without forming lithography glue film figure opposite to the assistant figure, so that the imaging effect turns good, but also the figure resolution and DOF are improved.

The invention discloses a femtosecond differential optical Kerr gate and an imaging device and method based on the optical Kerr gate. A probe light path is provided with a target to be detected, a scattering medium, the femtosecond differential optical Kerr gate and two single-pulse triggering CCDs in sequence, wherein the femtosecond differential optical Kerr gate is composed of a polarizer, an optical Kerr medium, a first beam splitting piece, two quarter-wave plates and two analyzers. The polarization direction of the polarizer is the same as the polarization direction of femtosecond detecting pulse light, the positive heterodyne angle ranging from 2 degrees to 5 degrees is formed by the polarization direction of one analyzer and the polarization vertical direction of the polarizer, and the negative heterodyne angle ranging from 2 degrees to 5 degrees is formed by the polarization direction of the other analyzer and the polarization vertical direction of the polarizer. A switching light path is provided with a half wave plate and an optical delay line. The femtosecond switching pulse light coincides with the femtosecond probe pulse light in the optical Kerr medium. A positive heterodyne single-pulse gating image and a negative heterodyne single-pulse gating image are obtained on the two single-pulse triggering CCDs respectively, subtraction is carried out on the two images to obtain a femtosecond differential optical Kerr gate single-pulse gating image of the target to be detected. The single-pulse imaging with the high signal to noise ratio is achieved, and the femtosecond differential optical Kerr gate and the imaging device and method based on the optical Kerr gate have the advantages that the time resolution, the image contrast and the system resolution are high.

The invention discloses a method and a device for decomposing the directional wave of an elastic wave field, and a computer storage medium. The method includes the following steps: expanding the time complex domain of an input wave field based on Hilbert transform to get a time complex domain expanded wave field; carrying out elastic wave numerical simulation on the time complex domain expanded wave field; based on an IDW interpolation algorithm of a preset variation function, decoupling and separating the longitudinal and transverse waves of the time complex domain expanded wave field after elastic wave numerical simulation to get a longitudinal-wave time complex domain wave field and a transverse-wave time complex domain wave field; and based on space complex domain expansion of Hilbert transform, decomposing the directional waves of the longitudinal-wave time complex domain wave field and the transverse-wave time complex domain wave field in front, rear, left, right, upper and lower directions to get multiple direction wave fields. The directional wave of a 3D elastic wave field can be decomposed, and the computational efficiency can be improved. The Poynting vector can be calculated using the directional waves obtained from decomposition, and then, a more accurate angle domain imaging gather can be obtained. The imaging quality is improved.

The invention discloses an airborne synthetic aperture radar moving target imaging method, which is applied to the technical field of radar. According to the invention, a signal is divided into two channels after pulse compression, the signal of one channel corrects second-order migration of moving target echo by using second-order Keystone transform; the signal of the other channel can also perform correction on the second-order migration of the moving target echo through constructing inverse second-order Keystone transform, then the two pressed signals are multiplied through a multiplier, first-order migration can be corrected, and finally a good imaging result can be obtained through azimuth matching and filtering. According to the method disclosed by the invention, a problem of first-order migration and second-order migration correction for a trajectory of the moving target echo can be simultaneously solved, and a good moving target imaging effect is achieved; and compared with theexisting moving target imaging algorithm, the method is more direct and concise in step, simpler in operation and capable of correcting the first-order and second-order migration.

The invention relates to an FPGA (field programmable gate array) imaging system for ultra wideband microwave target detection, in particular to an FPGA imaging system for ultra wideband microwave target detection, which aims at completing the comprehensive control on an imaging input / output system. The FPGA imaging system is provided with a top control module and an input / output port, so as to completely realize the FPGA data input and image output process of the three-dimensional imaging by ultra wideband detection. The FPGA imaging system for ultra wideband microwave target detection adopts the technical scheme that the FPGA imaging system comprises a transmission antenna, a receiving antenna, a signal processing module, a time delay calculation module, a focusing module and an image reconstruction module, wherein the transmission antenna and the receiving antenna are arranged at fixed locations; the transmission antenna is used for sending an ultra wideband microwave signal, and the receiving antenna is used for receiving the ultra wideband microwave signal reflected by a tested tissue. The FPGA imaging system is mainly applied to the design and manufacturing of detection, imaging and medical treatment equipment.

The invention discloses a positioning device and a positioning method of a handheld imaging system. The imaging system is provided with at least three groups of laser diodes, each laser diode group comprises at least two laser diodes, the included angle between laser rays emitted by the two laser diodes of each group is regulated, the intersection point of each laser diode group is located on a preset imaging surface, three or more groups of laser diodes are irradiated to an imaged object, the distance and angle of the imaging system relative to the imaged object are regulated, and when the two laser rays of each group are intersected on the imaged object to become a point, the fact that the distance and angle between the imaging system and the imaged object reach preset values is indicated, and the best imaging result is obtained.

The invention provides an inverse synthetic aperture radar imaging method combining a gate unit and transfer learning, and the method comprises the steps that a full convolutional neural network FCNN is constructed through employing a conventional convolution layer, an activation function layer, a batch normalization layer, a maximization pooling layer, and the like; a plurality of paths are established by utilizing jump connection SKs in the FCNN and are used for directly transmitting network shallow feature representation OFRs to a network reconstruction layer; secondly, the gate unit is further introduced into the FCNN to form a G-FCNN, and a transfer learning strategy TL is adopted to ensure that the performance of the G-FCNN is optimal; and then large-scale radar training data is constructed by using electromagnetic simulation software for pre-training the G-FCNN, and network layer parameters in the pre-trained G-FCNN are finely adjusted by using small-scale actually measured radar data to obtain optimal network parameters for a target imaging task. The inverse synthetic aperture radar imaging method is superior to an existing ISAR imaging method based on the convolutional neural network.

The present invention discloses an image processing technology-based passive millimeter wave radiation imaging system distance measurement method. The method includes the following steps that: two sets of passive millimeter wave radiation imaging systems of which the parameter settings are consistent are arranged on the same straight line sequentially relative to a target scene according to a passive distance measurement model; the same target scene is imaged through the two sets of passive millimeter wave radiation imaging systems, so that corresponding measurement imaging data are obtained; three characteristic points with the highest target scene matching degree are extracted from two groups of measurement imaging data through using a surf matching algorithm; and the area of connected regions of the characteristic points is calculated, and a target distance can be calculated through the passive distance measurement model. According to the distance measurement method of the invention, the passive millimeter wave radiometers are adopted to carry out imaging, and therefore, compared with photoelectric and infrared passive distance measurement methods, the distance measurement method of the invention can obtain better imaging results and higher distance measurement accuracy in harsh environments such as cloud, fog, battlefield smoke and so on.

The invention discloses a DSN-based high-resolution two-dimensional ISAR imaging method. The method solves the problems that the 2D-FISTA algorithm has openness of optimal regularization term coefficient selection, a CV-DNN network lacks theoretical support and needs high space and time complexity, and DSN cannot solve the problems of main lobe width, high sidelobe and the like of an RD image. Themethod comprises the following implementation steps: obtaining wave number domain echoes in a two-dimensional matrix form and wave number domain echoes in a one-dimensional vector form of ISAR two-dimensional scattering point distribution; solving a one-dimensional vector form and a two-dimensional matrix form of two-dimensional scattering point distribution; building a DSN network; setting a loss function; performing DSN network training; and completing the ISAR high-resolution two-dimensional imaging based on the DSN. Based on a sparse signal reconstruction theory, an SALSA algorithm is constructed into a deep network, high-resolution two-dimensional ISAR imaging is realized, an ISAR image with good focusing and a clean background is obtained, and the method can be used for efficientlyperforming high-resolution two-dimensional ISAR imaging in batches in complex electromagnetic environments with target echo defects, noise and the like.

The invention discloses a low-noise least square reverse time migration method. The method comprises the following steps: establishing a least square reverse time migration function; a sparse constraint term is added to a least square reverse time migration function to suppress noise, and a target function is obtained after sparse constraint of the Cauchy constraint term; and determining parameters of an objective function of the least square reverse time migration function after sparse constraint of the Cauchy constraint term, optimizing the gradient of the objective function, and performing minimization solution on the least square reverse time migration function by adopting a precondition nonlinear conjugate gradient method. According to the low-noise least square reverse time migration method disclosed by the invention, a new method for determining regularization parameters and hyper-parameters in Cauchy terms is provided, a better imaging result can be obtained, the convergence speed of inversion can be increased, and a method for determining step length is provided for an objective function containing Cauchy constraint terms.

The invention discloses a maximum contrast space-variant phase self-focusing ISAR imaging method. The method includes acquiring the ISAR echo data, and dividing the azimuth corresponding echo data and the distance corresponding echo data of the ISAR echo data to obtain M azimuth units and N distance units; determining the total number of slow time, and then obtaining the final focuse image of the ISAR echo data; calculating the final focus image contrast of the ISAR echo data, taking the final focus image contrast of the ISAR echo data as a cost function, respectively calculating the distance space-variant quadratic phase error coefficient estimate value of the nth distance unit, the azimuth space-variant phase error coefficient estimate value of the mth azimuth unit, and the quadratic phase error coefficient estimate value for the kth constant, and calculating the focus images of the mth azimuth unit and the nth distance unit; and obtaining the maximum contrast space-variant phase self-focusing ISAR image.

The invention discloses a detachable bionic eyeball model and an imaging method thereof. The detachable bionic eyeball model comprises a guide rail, a fixing base is fixedly installed at the upper endof the guide rail, a first supporting rod is fixedly installed at the upper end of the fixing base, an eyeball model part is fixedly installed at the upper end of the first supporting rod, and a model cover is arranged at the front end of the eyeball model part; an adjusting piece is arranged in the model cover and the eyeball model piece together, a first sliding block is slidably connected to the left portion of the guide rail, a second supporting rod is fixedly installed at the upper end of the first sliding block, a display plate is fixedly connected to the upper end of the second supporting rod, and a character piece and a light source are fixedly installed at the right end of the display plate; and the right part of the guide rail is slidably connected with a driving piece. According to the detachable bionic eyeball model and the imaging method thereof, a good demonstration effect can be achieved on adjusting force, the influence of eye axis changes on vision can also be demonstrated, and the eye protection consciousness is improved; and the imaging method is diversified, so that an optimal imaging result is convenient to select.

A method for optical short-distance correction, comprising the following steps: providing at least one circuit pattern to be exposed; forming at least one auxiliary pattern to be exposed perpendicular to the circuit pattern to be exposed, and the size of the auxiliary pattern to be exposed is smaller than the resolution of a photolithography machine; Transferring the circuit pattern to be exposed and the auxiliary pattern to be exposed to the photomask to form the circuit pattern and the auxiliary pattern. Through the above steps, not only when the auxiliary pattern perpendicular to the circuit pattern on the photomask is reflected on the semiconductor substrate, the photoresist film pattern corresponding to the auxiliary pattern will not be formed, and the imaging result becomes better, but also improves the Graphics resolution and DOF.

The invention relates to an imaging method and system based on clutter suppression of a through-the-wall radar. The imaging method comprises the following steps: acquiring an original echo signal received by the through-the-wall radar; performing imaging processing on the original echo signal to determine an original image; determining a discrete coefficient of a pixel vector of the original image according to the original image; sorting the pixel vectors of the original image according to the discrete coefficient to obtain the sorted pixel vectors; determining a stepping length according to the original image; determining a pixel elimination proportion according to the stepping length; determining a first elimination proportion by using the sorted pixel vectors and the pixel elimination proportion; determining a second elimination proportion according to the first elimination proportion and the pixel elimination proportion; and performing reproduction according to the pixel value corresponding to the second elimination proportion to obtain an imaging result. According to the method and the system provided by the invention, the imaging quality is improved by improving the clutter and background pixel vector suppression effect.

The invention discloses a positioning device and a positioning method of a handheld imaging system. The imaging system is provided with at least three groups of laser diodes, each laser diode group comprises at least two laser diodes, the included angle between laser rays emitted by the two laser diodes of each group is regulated, the intersection point of each laser diode group is located on a preset imaging surface, three or more groups of laser diodes are irradiated to an imaged object, the distance and angle of the imaging system relative to the imaged object are regulated, and when the two laser rays of each group are intersected on the imaged object to become a point, the fact that the distance and angle between the imaging system and the imaged object reach preset values is indicated, and the best imaging result is obtained.

The invention relates to a novel SPR sensor combined with a fluorescence imaging method. The novel SPR sensor comprises a light source generation device, a polarizer, a phase modulation device, a prism, an SPR sensor chip, a light source signal receiving device and a fluorescence imaging module. The light source generation device generates a light source. The phase modulation device modulates thelight source into SPR exciting light of different initial phases. Adapters on the sensor chip are used for capturing target cells. The light source signal receiving device receives reflected light signals. A computer converts the light signals into refractive index change information. After the targeted cells are captured by the adapters, adapters modified by a fluorescent dye are introduced again, a fluorescence imaging system excites the fluorescent dye to emit fluorescent light, and a CCD acquires an image to determine the density of the captured target cells. The novel SPR sensor accordingto the invention adopts a mode of using the adapters to capture the cells without the need of cell dissociation, so that operation is easy and convenient; and the SPR sensor working at a terahertz wave band and an infrared wave band has the characteristics of real time and high sensitivity in cell detection, and by combining with the fluorescence imaging method, detection is more accurate.

The invention discloses a natural image random forest imaging method based on an action potential discharging interval, aiming at solving the problem of directly using a biological vision system as animaging system, obtaining a natural image by decoding an action potential signal of a visual cortex, and further realizing the imaging of an external natural image scene. The method includes: by selecting natural images to stimulate animals, collecting action potential signals of the visual cortex of the animals, extracting cluster release interval features of the action potential signals, and imaging the extracted cluster release interval features with a random forest model algorithm to obtain natural images. The realization process is simple, the imaging effect of the natural image is good,and the imaging accuracy is high.

The invention discloses a scanning imaging system for weak light signals. The imaging system comprises a line scanning module and a light spot shaping module. The line scanning module comprises a line detector and an imaging lens. The light spot shaping module successively comprises a beam expanding unit and a beam compressing unit according to an optical path direction; a collimation light beam forms elliptical light spots through the light spot shaping module for illuminating a sample; and the sample generates light signals, the light signals, after being focused by an imaging lens of the line scanning module, are acquired by the line detector of the line scanning module for imaging, the sample and the line detector 1 move relative to each other for scanning, the scanning direction of the line detector is vertical to the long axes of the elliptical light spots, the long axes of the elliptical light spots are greater than the length of an imaging area of the line detector, and the ratio of the short axes of the elliptical light spots to the width of the imaging area of the line detector ranges from 0.8 to 1.5. The scanning imaging system for the weak light signals improves the illumination efficiency and solves the technical problems of quite weak signals and not high imaging speed during imaging of the line detector.

The invention discloses a femtosecond differential optical Kerr gate and an imaging device and method based on the optical Kerr gate. A probe light path is provided with a target to be detected, a scattering medium, the femtosecond differential optical Kerr gate and two single-pulse triggering CCDs in sequence, wherein the femtosecond differential optical Kerr gate is composed of a polarizer, an optical Kerr medium, a first beam splitting piece, two quarter-wave plates and two analyzers. The polarization direction of the polarizer is the same as the polarization direction of femtosecond detecting pulse light, the positive heterodyne angle ranging from 2 degrees to 5 degrees is formed by the polarization direction of one analyzer and the polarization vertical direction of the polarizer, and the negative heterodyne angle ranging from 2 degrees to 5 degrees is formed by the polarization direction of the other analyzer and the polarization vertical direction of the polarizer. A switching light path is provided with a half wave plate and an optical delay line. The femtosecond switching pulse light coincides with the femtosecond probe pulse light in the optical Kerr medium. A positive heterodyne single-pulse gating image and a negative heterodyne single-pulse gating image are obtained on the two single-pulse triggering CCDs respectively, subtraction is carried out on the two images to obtain a femtosecond differential optical Kerr gate single-pulse gating image of the target to be detected. The single-pulse imaging with the high signal to noise ratio is achieved, and the femtosecond differential optical Kerr gate and the imaging device and method based on the optical Kerr gate have the advantages that the time resolution, the image contrast and the system resolution are high.