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

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 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.

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 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 provides a motion error compensation method for a dual-station SAR receiver based on navigation satellite signals, including: establishing a relationship model between Doppler modulation frequency and motion error; estimating and compensating the plane motion error of the receiver method; Error estimation and compensation. The advantages are: according to the structural characteristics of the bi-station SAR based on the navigation satellite signal, the present invention proposes a method based on the instantaneous Doppler frequency modulation to correct the motion error of the receiving platform. This method fully considers the real model of 3D motion error, and can effectively estimate and compensate motion error. Moreover, the method does not need interpolation and iterative processing, has higher processing efficiency, and obtains better imaging results.

The invention provides an ECT / MWT dual-mode imaging sensor. The microwave sensing component and the capacitive sensing component are located in the same section to be measured or the distance between them is small, and the images of the microwave sensing component and the capacitive sensing component are weighted and superimposed. , the fusion imaging result can be obtained. The fusion imaging result contains features that a single imaging modality does not have, and can better reflect the real flow state of the fluid; the imaging rate of the capacitive sensing component can reach hundreds of frames per second, and can capture coherent The fluid manifold evolution process has a high imaging rate and sensitivity; the microwave sensing component can image high-humidity media, with strong adaptability to working conditions and a wide range of applications.

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.

A system (SYS) and related method for imaging support. The system (SYS) includes a stimulus delivery component (SDC), a response measurement component (RMC), and a decision logic unit (DL). The stimulation delivery component is configured to induce chemoreceptor stimulation in a patient residing in or at an imaging device (IA). The response measurement component measures a response of the patient to the stimulation. The decision logic (DL) establishes a sedation state of the patient based on the measured response to achieve the purpose of imaging the patient. If the patient is no longer sufficiently sedative, the imaging operation can be modified, for example.

The invention relates to an imaging method and system based on clutter suppression of through-wall radar, comprising: acquiring an original echo signal received by a through-wall radar; performing imaging processing on the original echo signal to determine an original image; The image determines the discrete coefficient of the pixel vector of the original image; sorts the pixel vector of the original image according to the discrete coefficient to obtain the sorted pixel vector; determines the step length according to the original image; The pixel elimination ratio is determined by the input length; the first elimination ratio is determined by using the sorted pixel vector and the pixel elimination ratio; the second elimination ratio is determined according to the first elimination ratio and the pixel elimination ratio; according to the second elimination ratio The pixel value corresponding to the ratio is reproduced to obtain the imaging result. The method and system provided by the present invention improve the imaging quality by improving the suppression effect of clutter and background pixel vector.

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.

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.