24 results about "Oblique projection" patented technology

Described are systems and techniques for visualization and manipulation of non- composite oblique aerial imagery. Information can be obtained for an annotation feature for overlay on a displayed oblique image with an oblique viewpoint of a scene within a geographic area. Three-dimensional (3D) model data can be obtained for a portion of the geographic area and including 3D information of object surfaces within the scene. A 3D representation of the annotation feature can be generated using the 3D model data and georeferenced coordinates determined for the annotation feature. An oblique projection of the 3D representation of the annotation feature into the oblique viewpoint of the scene can be generated to include portions of the annotation feature unobstructed by the object surfaces within the scene. The oblique projection of the annotation feature can be output as a two-dimensional (2D) overlay on the displayed oblique image. Unlocking insights from Geo-Data, the present invention further relates to improvements in sustainability and environmental developments: together we create a safe and liveable world.

Described are systems and techniques for visualization and manipulation of non-composite oblique aerial imagery. Information can be obtained for an annotation feature for overlay on a displayed oblique image with an oblique viewpoint of a scene within a geographic area. Three-dimensional (3D) model data can be obtained for a portion of the geographic area and including 3D information of object surfaces within the scene. A 3D representation of the annotation feature can be generated using the 3D model data and georeferenced coordinates determined for the annotation feature. An oblique projection of the 3D representation of the annotation feature into the oblique viewpoint of the scene can be generated to include portions of the annotation feature unobstructed by the object surfaces within the scene. The oblique projection of the annotation feature can be output as a two-dimensional (2D) overlay on the displayed oblique image.

The application discloses a method for suppressing main lobe interference of a multi-station radar system based on oblique projection. The method aims to solve the problem that the estimation of noise subspace is not accurate due to the energy leakage of interference, so that the noise subspace is no longer orthogonal to the interference subspace, and the orthogonal projection anti-interference performance is invalid. The implementation steps of the application include: directing the receiving antenna beams of each radar station in the multi-station radar system to the target and the area where the jammer is located; aligning the echo baseband signal vectors of each radar station in the multi-station radar system in the time domain to obtain a receiving signal matrix of the radar system; generating a covariance matrix; estimating a signal subspace; constructing an oblique projection operator; and multiplying the receiving signal matrix of the radar system by the oblique projection operator to obtain a signal after interference suppression. The application has the advantage that the suppression type interference signal entering from the main lobe of the radar station antenna can be effectively suppressed in a low signal-to-noise ratio scene.

The invention relates to the technical field of oil quality analysis, in particular to an aviation oil property analysis method and system based on spectral oblique projection. According to the method, when the oblique projection operator is constructed, the limitation of a traditional oblique projection operator is broken through through dynamic multi-component cooperation and self-adaptive residual error separation, key information which is in complex association with properties in the aviation oil spectrum is extracted more accurately, the pertinence and robustness of feature extraction are improved, and the accuracy of feature extraction is improved. Higher-quality input variables are provided for an aviation oil property prediction model, and the method is a core technical support for realizing high-precision aviation oil property analysis.

The optical detection apparatus includes a projection optical system, a digital microscope system, and a calculation unit. The projection optical system is configured to obtain oblique projection images of a plurality of through hole structures in the substrate. The digital microscope system is configured to acquire a 2D interference image. The calculation unit is electrically connected with the projection optical system and the digital microscope system. The calculation unit is configured to analyze the 2D interference image to obtain stereo image information and analyze the oblique projection image to obtain a plurality of parameters of the through hole structure. The optical detection device is a non-contact and non-destructive detection method, thereby providing feedback in real time. The plurality of through hole structures can be detected at the same time, and the time for scanning the substrate can be shortened. The shape and contour of the whole through hole structure can pass through an oblique projection image of the projection optical system and a 2D interference image of the digital microscope system.

This invention discloses a device and method for measuring the thickness of insulating coatings on metal sheets using off-axis oblique projection at the same point. The invention includes a laser displacement sensor, an eddy current displacement sensor, and a signal processing unit arranged on the same side but off-axis. The eddy current sensor measures the vertical distance *a* from its vertical probe to the upper surface of the metal substrate, and the laser sensor measures the oblique distance *b* from its tilted probe to the measurement point on the upper surface of the insulating coating. The same-point measurement design eliminates interference from sheet deformation. The signal processing unit converts the oblique distance *b* into a vertical height using a field calibration coefficient *k*, and calculates the thickness of the insulating coating *c* = *a* - *(b·k)*. This invention enables high-precision and stable online detection of insulating coatings on metal coils.

Described herein are methods of determining an alignment model associated with a mark layout. A method includes obtaining (a) first measurement data a relatively dense mark layout (e.g., more than 200 marks) in comparison with a relatively sparse mark layout (e.g., less than 65 marks) and a second measurement data associated with the relatively sparse mark layout, and (b) a first fitted model that describes object deformation for the relatively dense overlay mark layout; and determining the alignment model based on a second fitted model that describes object deformation for the relatively sparse mark layout, via an fitting technique, based on generalized squares fitting employing an oblique inner product matrix (e.g., W) or an oblique projection least squares fitting employing an oblique projection matrix (e.g., P).

This invention discloses a method for target projection 3D reconstruction based on multi-azimuth synthetic aperture radar (DEM) images, comprising: projecting a set of oblique-plane multi-azimuth SAR images onto a ground plane using a reference DEM; extracting target images from the ground-plane multi-azimuth SAR image set; binarizing the target image set to obtain a multi-azimuth mask image set; calculating the initial center position of the observed target based on the projection relationship obtained from the projection, and constructing an initial 3D structural model centered on this position; verifying the authenticity of the oblique projection point coordinates of the structural units using the multi-azimuth mask image set, and determining the true 3D structural model based on the verification results; and performing 3D reconstruction based on the true 3D structural model. This invention eliminates the need for registration based on feature points and image coherence, avoids dependence on strong scattering points, and improves the success rate of 3D reconstruction when the azimuth span is greater than 90 degrees.

A CT image reconstruction method and system based on maximum residual extended oblique projection belongs to the field of medical image processing technology. The method involves splitting the CT image matrix to be reconstructed column-wise to form several linear equation systems; and setting auxiliary vectors. z k Sum of solutions x k The initial value is z 0 and x 0; In the first iteration, the working column and working row are selected based on the maximum residual index, and the iteration is performed using the orthogonal projection method. z 0 and x 0; then continue to select working columns / rows according to the maximum residual index, and calculate the new column / row projection direction vector using the working columns / rows of the two adjacent steps, and iterate the auxiliary vector using the new column projection direction vector and the appropriate step size. z k If the new row projection direction vector is not zero, then the solution vector is obtained by iterating through the new row projection direction vector and a suitable step size. x k Otherwise, solve the vector by iteratively projecting the orthogonal vector. x k Output the final solution vector when the termination condition is met. x k+1 ;Arrange all final solution vectors by column x k+1 By combining the data, a reconstructed CT image is obtained. This disclosure improves the accuracy and efficiency of CT image reconstruction.

An optical inspection apparatus includes a projection optical system, a digital microscope system, and a calculating unit electrically connected to the projection optical system and the digital microscope system. The projection optical system is configured to obtain an inclined projection image of multiple through hole structures in a substrate. The digital microscope system is configured to obtain a 2D interference image. The calculating unit is electrically connected to the projection optical system and the digital microscope system. The calculating unit is configured to analyze the 2D interference image to obtain a stereoscope image data and to analyze the inclined projection image to obtain multiple parameters of the through hole structures. The optical inspection apparatus can be used to get a feedback in real-time. Multiple through hole structures can be inspected at the same time such that the time required to scan the substrate is reduced.

The invention provides a shape memory material driven double-projection oblique projection zoom AR-HUD optical system, which relates to the field of vehicle-mounted optics and comprises an image generation unit, a dynamic focusing module, an optical wedge and a windshield. Light rays are emitted by the image generation unit, sequentially pass through the optical wedge and the dynamic focusing module, are reflected to a windshield, and finally are reflected into the center of the visual field of human eyes; the image generation unit is used as a light source for emitting light to generate display content; the optical wedges can compensate optical path offset introduced by oblique projection to realize optical path oblique projection; the optical focal length is adjusted in real time through the dynamic focusing module, and the dynamic change of the virtual image distance is realized; the windshield serves as a reflecting surface and projects light to the view of a driver. According to the invention, the virtual image distance can be dynamically adjusted according to different driving scenes, the oblique projection imaging effect is better fused with the real three-dimensional world, the visual fatigue is relieved, the driving experience is improved, and the driving safety is ensured.

This invention provides a large depth-of-field digital imaging stereoscopic endoscope system, including an endoscope catheter, a binocular digital imaging miniature stereoscopic camera, a control and calculation subsystem, and a stereoscopic image electronic display. The control and calculation subsystem includes: an image acquisition and correction calculation module, which performs manufacturing parameter consistency calculations on the acquired raw binocular digital image data to obtain a parameter-consistent image; an image projection and posture correction calculation module, which corrects the phase angle tilt projection of the left and right images and the installation posture error to obtain a corrected image; and an image rearrangement and image output calculation module, which rearranges the corrected image to obtain a correctly projected image, and then outputs the final stereoscopic image. This invention solves the problems of flattened depth of field and viewing dizziness associated with stereoscopic images, improves the technical performance of the equipment, and lowers the technical threshold for the precision manufacturing and maintenance of 3D electronic endoscopes.

The utility model relates to the technical field of projection display, and discloses an oblique projection display device for household appliances, which comprises a shell, an optical support and a control PCB (printed circuit board), the optical support is mounted at the top of the control PCB through a mounting column, and an LED (light-emitting diode) lamp panel, a condensing lens, a space ring and an imaging lens are sequentially and vertically inserted into the inner side of the optical support. According to the utility model, the upper cover and the lower cover are embedded and installed to form the housing, a closed cavity is formed, all optical members are assembled and limited through the optical support, and the front reflector arranged on the slope surface is matched with the light outlet hole and the optical transparent sheet, so that the assembly precision and the projection effect are ensured; the problem of optical shielding is solved in an oblique projection mode, the installation limitation of the projection module in a household appliance product can be greatly reduced, and development and design of various projection function modules can be rapidly achieved by replacing the display device at the position of the space ring.

The invention relates to a hybrid source positioning method considering a mutual coupling effect under an analog-to-digital hybrid architecture, and the method comprises the steps: firstly, dynamically adjusting the switching state of antenna connection and a phase regulator, and reconstructing a covariance matrix through the correlation between received signals; secondly, estimating the DOA of a far-field source by using a MUSIC algorithm through the reconstructed covariance matrix, and compensating a mutual coupling effect at the same time; then, antenna connection is reconfigured by using the estimated far-field DOA information, and a mutual coupling coefficient is calculated and compensated; and finally, separating near-field signals through an oblique projection method by using the compensated covariance matrix, and carrying out two-dimensional DOA and distance estimation. According to the method, in a mixed modulus large-scale MIMO system, the problem of near-field and far-field mixed source positioning under mutual coupling interference is effectively solved, and the positioning precision and robustness are remarkably superior to those of an existing method.

The invention discloses a working method of a Sammer optical camera with a high depth-of-field oblique projection capability, and the method comprises the steps: collecting a low-resolution preview, fusing local phase consistency and a global structure tensor, and constructing an alignment index; if the index is low, the decision network generates an adjustment instruction, recalculates the index and calculates an imaging confidence steady-state value in combination with disturbance and control entropy, if the value exceeds a threshold for three times continuously, the current configuration is locked, and otherwise, optimization is continued; constructing a reachable domain based on three-dimensional semantic segmentation and the degree of freedom of a lens, and solving an object plane meeting a Sammer condition through Monte Carlo sampling and coplanar constraint to generate Sammer coverage; establishing a multi-scale degradation simulator according to the coverage degree, and calculating an effective information density gradient variance; the variance is used as an optimization target, a nested double-layer search algorithm is adopted, a collaborative weight vector is output, and lens tilting, aperture deformation and sensor displacement are precisely linked. According to the invention, the reliability of high-resolution imaging of the Sammer optical camera in a complex scene is improved.

The utility model discloses an oblique projection optical structure suitable for a head-up display system, which comprises a PGU image source and an eye box, the PGU image source is used for outputting displayed images, and the eye box is used for receiving the images output by the PGU image source; the device comprises a first reflector, a second reflector and a windshield, the first reflector and the second reflector are arranged on a light path of a PGU image source, the first reflector is used for carrying out first reflection on light emitted by the PGU image source, the second reflector is used for carrying out second reflection on the light reflected by the first reflector, and the windshield is arranged on the light path of the PGU image source. And the windshield is used for reflecting the light reflected by the second reflector to the eye box. According to the oblique projection optical structure suitable for the head-up display system provided by the utility model, virtual images at different angles can be obtained by changing the rotation angle of the PGU image source, the continuous adjustment of the included angle between the virtual image and the ground can be realized, the depth-of-field variation range can be expanded, and the oblique projection optical structure suitable for the head-up display system is adapted to different types of HUDs and meets the use requirements of different users.

The application discloses a kind of vehicle lamp imaging correction method and system based on gray scale modulation and storage medium, its method includes steps: according to the gray matrix of input image, the illumination of each pixel point on the image plane before and after tilting is obtained;According to the roughness of imaging surface and / or illumination intensity and / or illumination uniformity, the correction factor of each pixel point illumination is calculated;According to the illumination of each pixel point on the image plane when not tilting and the correction factor, the illumination distribution matrix of tilting projection system is calculated;According to the function relationship between the gray matrix of input image and the illumination distribution matrix of tilting projection system, the corrected input image gray matrix is calculated;According to the gray of each pixel point of original input image modulated by corrected input image gray matrix and pulse width modulation.The application solves the problem of illumination non-uniformity that vehicle lamp projection system projects image plane near bright, far dark.

This application relates to the field of multi-energy spectral CT imaging technology. This application discloses a method for reconstructing multi-energy spectral CT images based on a fast oblique projection correction algorithm, which can reduce the total computational cost of multiple iterations and improve the overall image reconstruction efficiency. The method includes acquiring a multi-energy spectral CT image as the current image and a preset residual value; when the preset residual value is greater than or equal to a preset threshold, the following steps are executed iteratively: when the current iteration is the first iteration of the current cycle, the direction of the current cycle is calculated using the fast oblique projection correction algorithm to obtain the target direction of the current cycle; a target reconstructed image is generated based on the target direction and the current image; a target value is generated based on the target reconstructed image; the value corresponding to the preset residual value is modified to the value corresponding to the target value; the image corresponding to the current image is modified to the image corresponding to the target reconstructed image; when the preset residual value is less than a preset threshold, the target reconstructed image is used as the final reconstructed image.

According to an exemplary embodiment, a structure of a surgical instrument for irradiating a focused ultrasound wave at a plurality of depths includes a movement unit, one pair of frames, a first transducer assembly which horizontally moves by the movement unit and upwardly / downwardly vertically moves to irradiate a focused ultrasound wave at a plurality of depths, a fitting unit which is coupled with the first transducer assembly, and a housing which accommodates the first transducer assembly in an inner space and is coupled to the movement unit to horizontally move the first transducer assembly in one direction or in the other direction by the movement unit or horizontally reciprocates the first transducer assembly in one direction and the other direction.

The utility model relates to the technical field of light sensors, in particular to a structured light sensor structure based on the Gremer's law, which comprises an imaging part, a projector and a base, and is characterized in that the imaging part comprises a camera and an imaging lens, and the camera and the imaging lens are connected through a C port; the imaging part is fixedly connected with the base; the projector is composed of an optical machine body and a projection lens, and the projector and the installation bottom plate are locked through screws. According to the structured light sensor, the structure is based on the Gremer's law, and the independent wedge-shaped block is arranged at the joint of the projection lens, so that the brightness uniformity and the definition consistency of an obliquely projected pattern are kept, a high-quality image is shot, and the high precision of measurement is further ensured. The independent wedge-shaped block provides convenience for changing the projection angle and replacing the projection lens, and one projection light machine main body can be made into a projector with various projection distances and different magnification proportions to adapt to different applications.

The application discloses a method for acquiring growing information of lettuce in a plant factory based on oblique shooting images, which adopts a camera to shoot the lettuce in the plant factory at a specific oblique angle, and then performs pretreatment on the obtained lettuce image, and the processing procedure comprises the following steps: data labeling, mask-rcnn instance segmentation model training, data screening, construction of a single lettuce data set, image processing operation is performed on the obtained image, partial phenotypic characteristics (inclined projection area, color information and texture complexity) of the lettuce are acquired, and a fresh weight estimation model is trained by using a convolutional neural network, and growing detection of the lettuce is realized. The application solves the problem that it is difficult to acquire growing information of crops in a closed and non-open space such as a plant factory planting rack, and has the characteristics of high accuracy and high efficiency, and is helpful to promote the construction of unmanned plant factories and to empower intelligent agriculture.

This invention relates to a fast method for estimating the direction of arrival (DOA) of mixed polarization signals with enhanced separation, comprising the following steps: multi-polarization array arrangement; multi-polarization array output modeling; fast estimation of the DOA of partially polarized signals; elimination of low-precision DOA of fully polarized signals; initialization of the oblique projection matrix; and estimation of the DOA of fully polarized signals based on oblique projection iteration. The advantages of this invention are: firstly, the method eliminates the influence of leakage from fully polarized signals and improves the accuracy of the oblique projection matrix through iterative calculation, thereby enhancing the separation between fully polarized and partially polarized signals; secondly, the method fully utilizes the characteristics of mixed polarization signals, resulting in high DOA estimation accuracy; and finally, the method does not require spatial domain search, thus exhibiting fast algorithm execution speed.

The invention discloses a robust adaptive beam forming method based on interference power estimation. The scene that a multi-antenna array receiver is used for airspace anti-interference in the environment with interference signals in different incoming wave directions is considered. The method comprises the following steps: firstly, constructing a feature subspace by using a sampling signal, and screening directional diagram nulls of a sampling matrix inversion beam former to obtain an estimated value of an angle of arrival of an interference signal; the desired signal steering vector is then estimated through principal feature vector extraction. Secondly, estimating the power of an interference signal by constructing an oblique projection operator, and further obtaining a reconstructed interference and noise covariance matrix; and finally, obtaining the beam former provided by the invention by using the reconstructed interference and noise covariance matrix and the estimated desired signal steering vector. The model is complete, the design method is reasonable and effective, the interference suppression capability of the receiving end can be effectively improved in the scene that the signal arrival angle is mismatched, and specific implementation steps are given.

The invention discloses a CT image reconstruction method and system based on maximum residual error expansion oblique projection, and belongs to the technical field of medical image processing. Splitting the to-be-reconstructed CT image matrix according to columns to form a plurality of linear equations; setting the initial values of the auxiliary vector zk and the solution vector xk as z0 and x0; in the first iteration, a working column and a working row are selected according to a maximum residual index, and z0 and x0 are iterated through an orthogonal projection method; then working columns / rows continue to be selected according to the maximum residual error index, new column / row projection direction vectors are calculated through the working columns / rows of two adjacent steps, the auxiliary vector zk is iterated through the new column projection direction vectors and the appropriate step length, and if the new row projection direction vectors are not zero vectors, the new row projection direction vectors are not zero vectors; if so, iterating the solution vector xk through a new row projection direction vector and a proper step length, otherwise, iterating the solution vector xk through orthogonal projection; outputting a final solution vector xk + 1 when a termination condition is met; and combining all the final solution vectors according to the column xk + 1 to obtain a reconstructed CT image. The CT image reconstruction precision and the imaging efficiency are improved.