108 results about "Geometric similarity" patented technology

The invention discloses a monocular distance-measuring method and system based on human eye positioning. The method comprises the steps that a human face image is collected through a camera carried by a mobile terminal, and the image is preprocessed; human face detection and human eye positioning are carried out on the preprocessed image, and the circle center coordinate positions of the two pupils are obtained; the distance from the human eye to a screen of the mobile terminal is obtained by combining the circle center coordinate positions, the actual interpupillary distance and the focal length and through a geometric similarity method. The monocular distance-measuring method and system based on human eye positioning can remind a user of the mobile terminal to keep a correct posture and an appropriate distance from the user to the electronic screen, and prevent myopia.

A large movable lateral uplifting composite lading slope physical model test apparatus comprises a test framework, a bottom uplifting mechanism, a rear portion loading mechanism and a water level elevating simulation mechanism; the bottom of the front portion of the test frame is hinged to the test site ground surface, the test frame is formed by mutually splicing a front panel at the front portion, at least two vertically-arranged guard boards and a frame baseboard at the bottom portion, and the spacing between adjacent guard boards is adjustable; the bottom uplifting mechanism is arranged below the test frame and is used for driving the rotation of the test frame around the hinge pint at the front portion; and the rear portion loading mechanism comprises a loading steel board, an electro-hydraulic servo loading machine and a counterforce wall, the counterforce wall is arranged behind the test frame, the rear end of the electro-hydraulic servo loading machine is hinged to the counterforce wall, the front end of the electro-hydraulic servo loading machine is connected with the loading steel board, and the rear portion loading mechanism is used for applying action force to a slope physical model in the test frame from the rear end of the test frame. The apparatus is suitable for large-size slope physical models, and can realize the establishment of three-dimensional models better satisfying geometric similarity conditions than real slopes.

The present invention provides an intelligent vehicle multi-laser radar fusion recognition method based on target features, relates to the field of intelligent vehicle environment perception. The method comprises the following steps: 1, performing pretreatment of collected data, extracting target geometric features and determining the type of the target; 2, calculating the geometry conformability degree of the target, and performing target matching according to the geometry conformability degree; 3, fusing the target geometric features through adoption of a method based on distance weight fusion; 4, tracking the target through adoption of a multi-feature target tracking method, and obtaining the relative movement features of the target; 5, obtaining the absolute movement features of the target through adoption of the vehicle movement features collected by a global positioning system; 6, correcting the type of the target according to the absolute movement features of the target and a target feature model; and 7, performing rasterization of the target features, and performing grid expression. The intelligent vehicle multi-laser radar fusion recognition method based on target features is configured to fuse the multi-laser radar through adoption of target features to improve the target recognition capability of a system and enhance the safety of a vehicle in the driving process.

A non-transitory computer-readable storage medium storing a set of instructions executable by a processor. The set of instructions is operable to receive a current patient medical image of a current patient, compare the current patient medical image to a plurality of previous patient medical images, each of the previous patient medical images corresponding to a previous patient, select one of the previous patients based on a geometric similarity between the previous patient medical image of the selected one of the previous patients and the current patient medical image, and determine an initial radiation treatment plan based on a radiation treatment plan of the selected one of the previous patients.

The invention discloses an application method of an indoor simulation device for the migration and the conversion of pollutant in an artificial shore zone. According to the invention, in the lateral supply direction of a three-dimensional seepage groove, ground water is supplied on one side where a stream flows to simulate the boundary condition of the groundwater flow in a field zone; reasonably proportioned solution is supplied on the other side to simulate the seawater in a coastal zone; and the interaction of salt water and fresh water realizes the real simulation of seawater and terrestrial water. By adopting the device provided by the invention, the physical simulation of the artificial shore zone is simulated to the greatest extend, a large-scale artificial coastal zone is downsized to a small-scale indoor physical simulation device under the guidance of geometric similarity theory, the comprehensive influences of adjustable water level height, saltwater and fresh water interaction, waves, rainfall and external contamination are comprehensively considered, the real simulation of the artificial coastal zone is ensured, and a foundation is laid for the numerical simulation of the artificial coastal zone and the late pollution abatement.

The invention discloses an arbitrary direction text line detection method in a natural image. The arbitrary direction text line detection method in the natural image comprises the following steps: (1) candidate text areas are detected through a maximum stable extreme area detection method with restriction, compound similarity among area pairs is obtained according to combination with size of the areas, absolute distance, relative distance, geometric similarity in a contextual information definition area and color similarity; (2) three areas are found, serve as seed areas of a candidate text line and are expanded to all areas in the line through a candidate text line identification method based on the similarity; and (3) non-text lines are removed through a filter based on morphologic framework characteristics, the filter conducts filtering through a sparse classifier and characteristic vectors required by the classifier are taken from the morphologic framework characteristics in all areas of the candidate text line. The arbitrary direction text line detection method in the natural image can detect text in arbitrary directions in the natural image. In addition, due to adoption of the area interior characteristic structured classifier, better identification accuracy can be achieved.

A structured morphology filtering method is disclosed for filtering an image for high precision machine vision metrology using specifically-determined structuring elements to precisely preserve the location of specific features in the filtered image. A selected structuring element shape generally exhibits geometric similarity with at least a portion of the feature to be preserved in the filtered image. The structuring element may be oriented to corresponds to the orientation of the feature to be inspected. For example, for a linear feature to be inspected, the optimal structuring element is a line or narrow rectangle at the same orientation, while for images of circles, it is a circle. The orientation of the structuring element may be determined or adjusted automatically during a set of automatic inspection operations, based on an automatic determination of the orientation of the feature to be inspected.

The invention relates to an experimental device for researching a drill column dynamic characteristic. The experimental device comprises a main machine frame, a well-wall-simulating assembly, a rotary assembly, a disc assembly, an excitation assembly, a weighing assembly and a detecting device. The well-wall-simulating assembly comprises an organic glass tube, a fixing clamping and a clamp mounting plate. The rotary assembly is provided with a motor, a driver, a coupler, a thin steel column and a top mounting plate, the rotary assembly penetrates through the whole main machine frame, the disc assembly comprises a disc and a cylinder, the disc is arranged on a floating platform, and the disc conducts rotary movement in the cylinder. An exciter in the excitation assembly excites the bottom of the disc according to the input signal type to simulate interaction of a drill head and rocks at the bottom of a borehole. The detecting device comprises a whirling motion track and a transverse vibration and longitudinal vibration detecting device. The experimental device for researching the drill column dynamic characteristic can simulate the vibration and deformation situations of a drill column and determine the parameters of the rotating speed, the bit pressure similarity ratio and the like according to the dynamic similarity ratio and the geometric similarity ratio.

The invention discloses a shallow burial coal mining earth surface interpenetrated crack distribution and air leakage characteristic judgment method. The method includes the following steps of determining the similar experimental material ratio according to actual stratum data of a mine, laying a similar material model according to the geometric similarity and the power similarity, conducting coal bed excavation after the material strength and the raw rock strength are similar, taking fracture development pictures after the model excavation is stable, conducting graying and vectorizing on the pictures through image processing software, importing the vectorized fracture images to numerical simulation software, conducting calculation, comparing the obtained result with measured data, and obtaining an accurate numerical model through unceasing modification. By means of the method, the overlaying strata fracture distribution and air leakage characteristics under the shallow burial coal bed condition can be disclosed, and the beneficial reference is provided for the on-site situations such as the blockage of air leakage passageways.

The invention relates to a tester for testing a discount rule of a water pressure of a grouting circle of an anti-water pressure emission-limit tunnel, comprising a pressure chamber, a simulation tunnel, pressurized equipment and measurement equipment, wherein the pressurized equipment comprises a nitrogen cylinder, a control valve, a pressure regulating valve, a switch, a water tank and an air-water exchange tank; the pressure chamber is a cylindrical container, comprising a switch, a flange plate, a support and a pressure chamber sleeve; the pressurized equipment utilizes the nitrogen cylinder combining with the air-water exchange tank for pressurization to provide a stable osmotic pressure for the pressure chamber; the simulation tunnel, a simulation grouting material and stimulation wall rock are placed in the pressure chamber; the diameter of the grouting material can be converted according to test requirements and geometric similarity; and the simulation tunnel can be precasted into be of different shapes and sizes according to the test requirements and geometric similarity. The measurement equipment can realize accurate measurement on pressure and flow rate. The tester can be used for researching the discount rule of hydraulic pressure of the grouting circle of the anti-water pressure emission-limit tunnel.

Disclosed is an approach for performing pattern classification for electronic designs. One advantage of this approach is that it can use fast pattern matching techniques to classify both patterns and markers based on geometric similarity. In this way, the large number of markers and hotspots that typically are identified within an electronic design can be subsumed and compressed into a much smaller set of pattern families. This significantly reduced the number of patterns that must be individually analyzed, which considerably reduces the quantity of system resources and time needed to analyze and verify a circuit design.

The invention discloses a similar reconstruction model experiment device and method based on three-dimensional geological prospecting. A three-dimensional geological prospecting device is used for prospecting three-dimensional geological information of a study area, then the three-dimensional geological information is input in a three-dimensional data reconstruction system and reconstructed into three-dimensional data information, and the three-dimensional data information is input in a 3D printing device; similar materials and ratios corresponding to different geological structures are determined, and then three-dimensional stratigraphic section geological information of the study area is determined according to the three-dimensional data information; a 3D printing coal rock is printed ina model frame through a 3D printing device according to the geometric similarity rate and the volume-weight similarity rate, and a data monitoring device is mounted in the 3D printing coal rock; a hydraulic loading unit is started to apply loads; analogue simulation is carried out corresponding to the actual rock soil activity condition of a site, data in the data monitoring device is collected in the activity process, thus, the underground rock stratum real condition and rock stratum activities are accurately reflected, and meanwhile stress and displacement multi-site time varying monitoringand analyzing are achieved.

The invention discloses an indoor simulation device for the migration and the conversion of pollutant in an artificial shore zone. According to the invention, in the lateral supply direction of a three-dimensional seepage groove, ground water is supplied on one side where a stream flows to simulate the boundary condition of the groundwater flow in a field zone; reasonably proportioned solution is supplied on the other side to simulate the seawater in a coastal zone; and interaction of salt water and fresh water realizes real simulation of seawater and terrestrial water. By adopting the device provided by the invention, the physical simulation of the artificial shore zone is simulated to the greatest extend, a large-scale artificial coastal zone is downsized to a small-scale indoor physical simulation device under the guidance of a geometric similarity theory, the comprehensive influences of adjustable water level height, saltwater and fresh water interaction, waves, rainfall and external contamination are comprehensively considered, the real simulation of the artificial coastal zone is ensured, and a foundation is laid for the numerical simulation of the artificial coastal zone and the late pollution abatement.

An embodiment of the invention discloses a stress deformation indoor model test device for shield tunnel structures and a method for mounting the stress deformation indoor model test device. The stress deformation indoor model test device is characterized in that a tunnel model is positioned in a model groove, displacement meters and strain gauges are arranged on the tunnel model and are connectedwith a data acquisition instrument, and longitudinal and transverse deformation evolution conditions of the tunnel model after stress is applied to the tunnel model can be comprehensively monitored in real time; a soil layer is positioned around the tunnel model, and the properties of soil mass around real tunnels can be restored; a pressure device is positioned on the soil layer and is used forsimulating temporary pile-loading effects of earth surfaces. The stress deformation indoor model test device and the method have the advantages that the stress deformation indoor model test device isdesigned according to geometric similarity ratios and volume weight ratios of the actual tunnels, and accordingly the consistency of the stress deformation indoor model test device and prototype tunnels can be guaranteed; deformation evolution laws of the shield tunnel structures can be obtained by means of research on segment structure opening, slab staggering, bolt internal force, segment stressand convergence deformation conditions under simulated earth surface pile-loading conditions; damage degrees of segments under earth surface load can be evaluated on the basis of the deformation evolution laws, and reference can be provided to actual engineering.

The invention discloses a bidirectional penetration model testing device suitable for soil-rock slopes. The bidirectional penetration model testing device comprises a slope deposit, water penetration pipes, cover plates, a water source, a deformable water permeable bearing pad body, a water permeable support body, pore pressure gauges and inclinometer tubes, wherein the slope deposit is obliquely arranged and has two upper oblique side surfaces of water penetration surfaces; the water penetration pipes are positioned above the water penetration surfaces of the slope deposit; the cover plates are positioned above the water penetration pipes, made of transparent materials and used for sealing penetration water; the water source is connected with the water penetration pipes the deformable water permeable bearing pad body is opposite to the water penetration surfaces of the slope deposit and positioned below the slope deposit; the water permeable support body is positioned below a deformable water permeable layer and used for supporting the slope deposit; the pore pressure gauges are buried in the slope deposit; the inclinometer tubes are used for enabling a probe of an inclinometer to get in and out. The long slope surface in the slope deposit forms an angle of 20-45 degrees with the ground, and the water penetration pipes which are horizontally arranged are respectively designed with a plurality of water penetration holes. The bidirectional penetration model testing device can truly simulate the effective stress and the water pressure in a slope body of a soil-rock slope under the synergy of penetration along the slope direction and the penetration which is vertical to the slope surface according to an amplification ratio, and solve the difficult that a general geotechnical model is difficult to simultaneously meet geometric similarity and physical similarity.

The invention relates to a small waterplane double-hull wave load test model design and test method. Models which are consistent with the weight distribution, geometric similarity and motion similarity of all sections of a real ship are manufactured, the models are subjected to segmentation processing, a measuring beam frame is arranged, and through load collection and analysis calculation of strain gauges on the measuring beam frame, ship motion state parameters and main loads borne by the ship body are accurately obtained. The method can be used for measuring data of six-degree-of-freedom motion and acceleration of a small waterplane catamaran model in waves and for measuring seven key wave load values such as vertical wave bending moment and shearing force, vertical shearing force of amiddle longitudinal section, transverse opposite opening force and transverse wave bending moment, horizontal torque and overall asynchronous pitching torque. The method has very important significance in mastering wave load characteristics of the type of ship and determining reasonable structural design loads.

The invention discloses a cracked roof caving region grouting filling similar simulation method. The method includes the steps that a geometric similarity ratio of a similar simulation experimental model is determined; a coal bed bottom plate and a coal bed are laid according to the geometric similarity ratio and a laying scheme; the side length a and the number n of layers of cubes of an immediate roof are determined, and then laying of the immediate roof is conducted; similar simulation materials are laid above rock stratums of the cubes, and a grouting filling roadway and grouting drilling holes are reserved in corresponding positions; steps of open-off cut and working face simulation support installing are conducted. Due to the fact that the regular cubes are utilized to simulate the immediate roof, the requirements of a cracked roof caving region grouting filling similar simulation experiment for simultaneously conducting mining and caving of a cracked roof can be met; breakage expansion coefficients of a cracked roof after caving can be controlled by adjusting the side length of the cubes and the free caving height of the cracked roof, it can be guaranteed that the cracked roof caving region grouting filling similar simulation experiment can well simulate the field, and the problems that in the prior art, similar materials are utilized to simulate the caving process of the caving region, simulation is inaccurate, and the simulation result does not conform to the actual situation are solved.

The invention provides a method for calculating frozen soil model thermal parameters based on a similarity theory. The method comprises the steps: with use of specific heat and thermal conductivity coefficients of original soil at different negative temperatures, fitting to obtain a changing curve of the specific heat and thermal conductivity coefficients of the original soil along with the temperature, and calculating latent heat of the original soil with per unit volume; according to a geometric dimension shrinkage ratio of the prototype and a model, determining a geometric similarity constant Cl, namely a; if the density of the prototype soil is [rho]p and the density of the model soil is [rho]m, determining the soil density similarity constant C[rho], namely the ratio of the [rho]p tothe [rho]m; if the cold source temperature of the prototype is Tp and the cold source temperature of the model is Tm, determining the temperature similarity constant CT, namely the ratio of the Tp tothe Tm; and according to the determined similarity constant of the physical parameters, calculating to obtain the thermal parameters of frozen soil. The method has the effects that the calculation method makes up calculation of the thermal parameters of the model soil in the frozen soil temperature field model test, the calculation error is less than 0.1 DEG C, the accuracy satisfies the application of thermal value in actual engineering, and thus the accuracy of the model test results is ensured.

The invention discloses a novel aeroelastic model for a wind tunnel test of a power transmission tower structure, and belongs to the technical field of the design of power transmission lines. The novel aeroelastic model for the wind tunnel test of the power transmission tower structure comprises crank arms, angle steel type segments, n-type spring sheets, copper wires, and a tower skeleton body, the tower skeleton body is formed by connection of angle steel type aluminium segments which are formed by machining according to geometric similarity through bolts, the crank arms are formed by connection of the angle steel type aluminium segments through the n-type spring sheets, and the inner sides of the angle steel type segments are provided with counterweight metal wires. According to the aeroelastic model, the rigidity similarity of the aeroelastic model is guaranteed through adjustment of geometric parameters of the spring sheets, the similarity of parameters such as mass, damping, frequency, and geometry etc. is realized by employing the counterweight of the metal wires and the angle steel type aluminium segments reduced with equal proportion, the aerodynamic force characteristic of the power transmission tower by the wind load can be accurately simulated, the wind tunnel test of the model can obtain real and reliable data, and the research of the wind load characteristic of the power transmission tower is facilitated.

The invention discloses a magnetic field force-seepage force model test device applicable to an earth-rock slope. The magnetic field force-seepage force model test device mainly comprises a talus body, a magnetic force layer, an infiltration tank, a header tank, a deformable permeable leg protecting body, a rainfall pipe, a displacement sensor and a pore pressure gauge, wherein the talus body and the ground form an angle of 20-45 degrees; the magnetic force layer is arranged below the talus body and parallel to the talus body; the infiltration tank is arranged at the upper end of the talus body, communicated with a water source and used for exerting seepage force along the slope on the talus body; the header tank is arranged in the direction of the lower end of the talus body and used for collecting seepage; the deformable permeable leg protecting body is arranged between the lower end of the talus body and the header tank and used for maintaining slope legs of the talus body; the rainfall pipe is arranged above the talus body, communicated with the water source and used for simulating rainfall; the displacement sensor is arranged above the talus body; the pore pressure gauge is arranged inside the talus body. The magnetic field force-seepage force model test device can really simulate effective stress and water pressure of the earth-rock slope inside the slope body under the synergistic effects of the seepage force along the slope and the magnetic field force of the vertical slope, the problem that a geotechnical model experiment cannot easily meet the geometric similarity and the physical similarity is solved, and a research means is provided for ecological protection of the earth-rock slope.

The invention provides an image similarity determining device and method and an image feature obtaining device and method. The image similarity determining device comprises a preprocessing unit, a matched feature point set determining unit, a geometric similarity determining unit and an image similarity determining unit. The preprocessing unit is used for extracting feature points of all input image areas of an input image and feature points of all image areas, to be matched, of a data source image. The matched feature point set determining unit is used for determining one-to-one matched feature point pairs between the input image areas and the image areas to be matched. The geometric similarity determining unit is used for determining the geometric similarity between the input image areas and the corresponding image areas to be matched according to the distribution situation of the feature points of the input image areas and the corresponding image areas to be matched. The image similarity determining unit is used for determining the similarity between the input image and the data source image according to the geometric similarity between the input image areas and the corresponding image areas to be matched. The image matching precision can be improved.

The invention provides a design method of a scaling model machine based on the combustion engine similarity theory of diesel engines. The method comprises following steps: constructing a model machinecorresponding to a prototype, the model machine and the prototype have any one or any of the following relationships: geometric similarity; boundary condition similarity; media condition identity; the dimensionless piston speed remains equal at the corresponding crank angle; oil injection rules are the same; eddy current ratios are the same; delay periods are the same; influences caused by heat transfer loss are the same. The invention also provides a scaling model diesel engine made according to the above-mentioned design method of scaling model machine based on diesel combustion similaritytheory. The invention can utilize the reduced scaling model machine to reproduce the spray combustion and emission characteristics of the target prototype and map back to the prototype, thereby reducing the cost of the development process of the large diesel engine parts and the optimization process of the whole machine. At the same time, it has guiding significance for the intensive development of different cylinder diesel engine products.

An observation method for fluid precision finishing of surfaces of micro-structures of molds is based on a fluid flowing similar simulation method. A tiny mold structural surface is proportionally magnified, flowing states of sparse abrasive particle flows in tiny constraint flow channels are simulated, real-time image data in the flow channels are acquired and processed, and a distribution state, movement rules, typical flowing state characteristics and development trend of the sparse abrasive particle flows in environments of the tiny constraint flow channels are obtained; and experiments show that properties of forces stressed at various points in a flow channel model and properties of forces stressed at various corresponding points in a mold tiny constraint flow channel prototype are identical on the premise of meeting requirements of geometric similarity and kinematic similarity, the forces are proportional, a proportion constant keeps unchanged to optional corresponding points in two flow fields, and fluid dynamic properties of the two flow fields meet requirements of second law of flow similarity. The invention further provides an observation device for fluid precision finishing of surfaces of micro-structures of molds. The observation method and the observation device have the advantages that fluid finishing conditions and states for the surfaces of the micro-structures of molds can be well simulated, operation is simple, convenient and feasible, and universality is good.

The invention discloses a measuring device and method for shield tunnel segment joint deformation. The device is composed of an anchoring joint, a fixed rod, a transmission rod, a follow-up rotary laser transmitter, an optical screen and other components. According to the basic principle of the device, through reasonable design and arrangement of the rod and the laser transmitter, deformation of segment joints are amplified, and the joints do not affect one another when expanded and staggered. According to the designed measuring device, expansion of the joints enables a laser optical path to turn horizontally, staggering of the joints enables the laser optical path to deflect vertically, corresponding geometric figures are formed before and after change in the laser optical path, and the expansion amount and staggering amount of the joints can be conveniently calculated through the geometric similarity relation. Compared with existing measuring means, by the adoption of the measuring device, deformation of the joints can be measured comprehensively, the measurement precision of joint deformation is greatly improved, and the problem that it is hard to measure joint deformation accurately and comprehensively in practical engineering by existing measuring means is solved.

In order to solve a problem of query of similarity between spatial scenes, the invention considers geometrical features of a space object, and a topological relation, a direction relation and a distance relation between the space objects and provides a similarity algorithm matched with a building scene, and the similarity algorithm comprises geometric similarity between the space objects and spatial relationship similarity between the space objects, wherein the spatial relationship similarity includes topological similarity, direction similarity and distance similarity; and a geometric feature similarity calculation model and a spatial relationship similarity calculation model for calculation of the spatial scenes are respectively provided. Through utilizing the geometrical similarity calculation model for the spatial scenes to carry out rough similarity matching on the objects in a database and then utilizing the spatial relationship model to carry out accurate matching, the query of the similarity between the spatial scenes is completed. The models can objectively reflect the internal relation between the spatial scenes, and the query effect is good.

The invention discloses a landslide test apparatus. The apparatus comprises a model framework, a landslide model positioned in the model framework, a seepage device positioned in the model framework,a loading device positioned above the landslide model and passing through the model framework, and a measuring device positioned in the model framework, wherein the seepage device is used for injecting water into the periphery of the landslide model to simulate the water content change of the landslide model through the water level change of the water, the loading device is used for applying loadto the top slope of the landslide model, and the measuring device dynamically monitors the water content change of the landslide model in order to measure the stability of landslide model with different water content values. A real weight landslide simulation three-dimensional space model meeting geometric similarity conditions is established through simulating the stability of the landslide modelunder different water content value conditions and simulating the stability of the landslide models under different externally applied forces, and the apparatus has the advantages of open structure,flexibility and convenience in installation, and extensive application.

The invention is composed of object to be detected, track and observation system in synchro speed, image collection and digital image process system, I / O system. Through cable, which are connected through cable. The track and observation system is fixed on the object to be detected. The invention is non-contact measurement. Based on geometrical optics, picking up light signal and using relation of geometric similarity measures shearing strain angle without use of sensor so as to provide high measuring precision. The invention is applicable in complex operating environment since signal is transferred through optical fiber, and CCD is setup outside so that influence of external factors are avoided. Features are: dynamic measurement, dynamic digital display, and friendly man-machine interactive characteristics.