Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Hiro

47results about How to "Reduce search area" patented technology

Smooth path planning method for mobile robots based on dynamic complex environment

The invention relates to a smooth path planning method for mobile robots based on a dynamic complex environment, and belongs to the field of robot path planning. The method comprises the steps of starting; searching for an optimal path; conducting smooth treatment on the optimal path; ending. The step of searching for the optimal path uses a two-way RRT algorithm with the idea of gravity of an artificial potential field to perform path searching, that is, the artificial potential field gravity guides a random tree to grow toward a target direction, and the RRT algorithm is prevented from randomly sampling the global; a two-way A* algorithm after a heuristic function is improved is adopted to add angle factors based on distance factors, the units of distances and angles are normalized, thepath planning time is greatly reduced, and the convergence speed of paths is improved; smoothing treatment is conducted on the optimal path, a Freudian smoothing algorithm is adopted to remove redundant nodes, a B-spline method is used three times for smoothly connecting remaining nodes, and the smooth optimal path is finally obtained.
Owner:LUDONG UNIVERSITY

Rapid distance-measuring method for pedestrian on road ahead on the basis of on-board binocular camera

The invention provides a rapid distance-measuring method for pedestrian on a road ahead on the basis of an on-board binocular camera and discloses a binocular detecting and distance-measuring method for a pedestrian applicable to an automatic driving system. The method comprises the steps: training a pedestrian detecting model by means of a pedestrian detecting method based on study, and detecting pedestrians in a binocular scene by means of the pedestrian detecting model; calculating a matching point of a point, chosen from the detection result of a left image, in a right image according to a color characteristic and a scale-invariant characteristic, and calculating a parallax value between matching pairs; obtaining an accurate parallax value of the detection result by means of a parallax mid-value searching method, and calculating a distance between the pedestrian and the camera according to a geometrical relationship between a camera coordinate system and an image coordinate system. With respect to the problems of slow calculation speed and inaccurate distance measurement in the present pedestrian detecting and distance-measuring method for a pedestrian based on the binocular camera, the method accelerates the detection speed by means of a road column-like model; and the distance-measuring accuracy of pedestrians in a road scene is improved by means of the matching of many characteristic points.
Owner:HUAZHONG UNIV OF SCI & TECH

Saliency detection and LSD linear detection-based airport extraction method

The invention relates to a saliency detection and LSD linear detection-based airport extraction method comprising the following steps: an original airport detection data set is built; remote sensing images are extracted one by one from the data set and are subjected to downsampling operation, Frequency-tuned method based saliency detection is conducted on the downsampled images, a full resolution saliency map is formed, linear segments in the saliency map are obtained via LSD linear segment detection operators, the obtained linear segments are segmented and then connected to form long linear segments, parallel straight lines are screened out, obtained parallel straight lines are clustered, a minimum bounding rectangle zone for each type is extracted and then expanded outward by 1.1 times to form a final airport zone, and coordinates of the airport zone are output and drawn up in original remote sensing images. Via LSD linear detection in the airport extraction method disclosed in the invention, texture and edge information in the images can be successfully extracted, FT saliency detection is combined with the LSD linear detection, detection is expedited, and precision is ensured while detection accuracy is enhanced.
Owner:WUHAN UNIV

Quick fingerprint identification method based on strange topology structure

The present invention discloses a rapid fingerprint identification method based on the singular point topology structure, and the rapid fingerprint identification method can fast process and identify the fingerprint images in the automated fingerprint identification system by using singular point topology structure in fingerprints. The present invention classifies the fingerprint database according to the classification property and position stability of the singular point in fingerprint images, and selects the most reliable singular point as a reference point to build the singular point topology structure of fingerprints and a module to identify; the present invention firstly detects the authenticity of singular points in a fingerprint image, and then classifies the database according to the relative position of singular points to build a topology structure adjacent to the singular point; and the topology structure can be used to build the fingerprint module to speed up the comparison process of the fingerprints; the rapid matching of fingerprints in the automated fingerprint identification system is a difficulty of the fingerprint recognition technology; the rapid fingerprint identification method, on one hand, can guarantee the recognition performance, on the other hand, can significantly improve the recognition speed of the automated fingerprint identification system, and can widen the scope of application; moreover, the method reforms the prior system slightly.
Owner:CHIPONE TECH BEIJINGCO LTD

Dynamic environment-friendly travel path planning method for automobiles

The invention discloses a dynamic environment-friendly travel path planning method for automobiles. The method comprises the following steps that an actual vehicle-mounted experiment is completed, anemission calculation model is established, a Dijkstra algorithm is optimized, an ArcGIS vector map is formed, path planning simulation is carried out, specifically, the actual vehicle-mounted experiment is completed by using MAHA METDH6.3 so as to acquire real-time vehicle emission data, a passenger vehicle emission calculation model is established based on VSP by adopting the data, the road network vector map is built according to a real urban road map by utilizing an ArcGIS platform, road network data of the vector map is imported into MATLAB, a dynamic optimal path is simulated and solved by combining the optimized Dijkstra algorithm with the emission calculation model and dynamic traffic information simulation, the established dynamic environment-friendly travel path planning model canplan the route schemes of different optimization targets better, the difference of different routes and different indexes is judged, the method is applied to actual road driving, drivers are assistedto complete the optimal path planning, and environment-friendly travel path planning suitable for being coupled with dynamic traffic is realized.
Owner:SHANDONG UNIV OF TECH

Satellite communication in motion rapid capturing method

The invention discloses a satellite communication in motion rapid capturing method; the method comprises the following steps of 1, performing system initializing; 2, establishing a coordinate system;3, carrying out pre-adjustment of antenna pointing; 4, carrying out coarse capture of an antenna; and 5, carrying out accurate alignment of the antenna. The method is simple in steps, reasonable in design and convenient to implement, and pre-adjustment of antenna pointing is realized by utilizing the position and speed information of a carrier detected by a GPS module, so that the target communication satellite can be rapidly captured under different motion states of the carrier, the accurate alignment of the antenna and the target communication satellite is realized, the capture and fine alignment time is short, the stability of the antenna relative to the inertial space is ensured, the rapid response capability of the communication in motion system is improved, and the method is high inpracticability.
Owner:中国人民解放军火箭军工程大学

Information transmission method of unmanned device, and base station

An embodiment of the invention provides an information transmission method of an unmanned device. The information transmission method relates to the technical field of aircrafts, and can determine geographic position information of a target terminal through acquiring a terminal signal in a coverage range by arranging a base station on the unmanned device. The method comprises the steps that: the base station obtains signals of terminals, and finds out the signal of the target terminal; the base station determines the geographic position information of the target terminal according to the signal of the target terminal; and the base station transmits the geographic position information to a flight control device, so that the flight control device performs flight control over the unmanned device according to the geographic position information. The information transmission method of the unmanned device and the base station provided by the invention can be applied to the flight process of searching or performing other tasks by the unmanned device.
Owner:NANJING BAILIAN INFORMATION TECH CO LTD

Integer ambiguity granularity changing determination method in single frequency receiving machine absolute positioning

The invention discloses a determination method of variable granularity of integer ambiguity of a single-frequency receiver in the absolute positioning, belonging to the technical field of satellite navigation and positioning and relating to a method for carrying out the single-point precise positioning by the single-frequency receiver in a satellite navigation positioning system with the utilization of the satellite carrier phase. The determination method is based on the utilization of the single-point static positioning LAMBDA algorithm to calculate the float solution and the distribution variance of the integer ambiguity, firstly carries out the rough integral mapping of the float solution to complete the roughening of the integral domain of search space, then utilizes the rough integral granularity to change the search region and carries out the search of the integer ambiguity according to search conditions to obtain the integral domain of the integer ambiguity; then the rough integral granularity is continuously reduced, the process is repeated till the rough integral granularity is equal to 1, then the search of the integer ambiguity is completed, and the precise carrier phase integer ambiguity is obtained. The use of the invention can rapidly, conveniently and reliably realize the carrier phase high-precision positioning of the single-frequency receiver and can be applied in the low-cost and high-precision navigation positioning system.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Object prediction area optimization method applicable to target identification

The invention discloses an object prediction area optimization method applicable to target identification, comprising the following steps: expanding an object prediction area; performing image segmentation; performing super pixel bounding box calculation and super pixel significance evaluation; and finally, getting an optimized object prediction area based on sliding window search of super pixels. By controlling the size of super pixels, the scale of image segmentation is increased, the search scope of super pixels is reduced, and therefore, the time complexity of the algorithm is low and is only related to the number of super pixels in an image; as the pixels in the super pixels are consistent and segmentation of the local edge is better, a better locating effect can be produced by taking super pixels as the basic elements of sliding window search compared with single pixels; the search area is reduced effectively, and the traditional pixel-based sliding window search algorithm is accelerated; and in addition, by cascading the method, the target identification accuracy of the existing target identification algorithm can be improved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Real-time runway detection method based on sensor prior knowledge

The invention belongs to the technical field of embedded computer image processing and in particular relates to a real-time runway detection method based on sensor prior knowledge. A conventional runway detection algorithm mainly aims at satellite images and downward-looking high-altitude aerial images, the images are not accordant with fore-sight aerial images required by a vehicle-mounted synthetic vision system, in addition, detection is carried out for static images generally, a relatively long calculation time is needed, and the real-time requirement cannot be met. Therefore, the invention discloses the real-time runway detection method based on sensor prior knowledge. By adopting the method, information such as flying positions and postures provided by a vehicle-mounted sensor is also included into calculation, so that search areas of runway detection can be greatly reduced, and positions of runways in images can be rapidly and accurately detected.
Owner:XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA

Method and apparatus for identifying features of an object and tomography imaging

The present invention relates to a method and apparatus for determining the position of a feature of an object under test in a tomography image. The method comprises: - determining characterizing points, in an additional image, of a feature of the object of interest; - determining position data relating to the feature in the additional image based on the detected characterizing points; and - identifying a feature of the object of interest in the tomography image, wherein the determined position data in the additional image is used to guide the identification. The invention also relates to a computer readable medium which upon execution by a processor configures a computer to perform the method.
Owner:CANON KK

A straight line and arc combined lane line detection method

The invention provides a straight line and arc combined lane line detection method, which comprises the following steps of S1, carrying out driving scene judgment by carrying out gray histogram statistics on a local area of an image; S2, setting a lane line detection region of interest; S3, constructing a lane line width fitting function between the lower boundary of the image and the vanishing point; S4, obtaining lane line candidate points, and screening and linking the lane line candidate points to obtain straight line candidate points; S5, adopting an upward search mode, obtaining straightlines by utilizing a least square method, and screening the straight lines to obtain lane line candidate straight lines; S6, matching lane lines according to the lane width and left and right lane line angle limits to obtain a linear lane line detection result; S7, inversely projecting the straight line lane lines into the IPM, and constructing a lane line curve arc set; S8, generating a lane line curve arc and a curvature radius in the image coordinate system. The method has the advantages of being reasonable, good in adaptability, capable of reducing the hardware requirements and high in accuracy and real-time performance.
Owner:合肥思艾智能科技有限公司

Crowd statistical method based on depth learning

The method discloses a crowd statistical method based on depth learning. The method extracts a motion foreground from a video, ensures camera angle of view and perspective invariance by using a humanbody region model, and finally determines the human body region statistical number through preprocessing, extraction, and detection. The method can not only reduce the search area of the sliding window and improve the search efficiency, but also overcome the deformation defect of the monitoring video, caused by view angle, monitoring scene distance, and the like, and installation and deployment ofthe system are simple, a detection model based on a depth learning convolution neural network improves the accuracy of human detection, the use of a non-maximum suppression method eliminates redundant sub-regions to reduce repeated counting, so that the results of human detection, human location and population statistics are more accurate.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Quick fingerprint identification method based on strange topology structure

The present invention discloses a rapid fingerprint identification method based on the singular point topology structure, and the rapid fingerprint identification method can fast process and identifythe fingerprint images in the automated fingerprint identification system by using singular point topology structure in fingerprints. The present invention classifies the fingerprint database accordingto the classification property and position stability of the singular point in fingerprint images, and selects the most reliable singular point as a reference point to build the singular point topolo gy structure of fingerprints and a module to identify; the present invention firstly detects the authenticity of singular points in a fingerprint image, and then classifies the database according tothe relative position of singular points to build a topology structure adjacent to the singular point; and the topology structure can be used to build the fingerprint module to speed up the comparisonprocess of the fingerprints; the rapid matching of fingerprints in the automated fingerprint identification system is a difficulty of the fingerprint recognition technology; the rapid fingerprint identification method, on one hand, can guarantee the recognition performance, on the other hand, can significantly improve the recognition speed of the automated fingerprint identification system, and can widen the scope of application; moreover, the method reforms the prior system slightly.
Owner:CHIPONE TECH BEIJINGCO LTD

Bar code positioning method in complex scene

Provided is a bar code positioning method in a complex scene. An image is segmented into subareas, a histogram of oriented gradient (HOG) characteristic of each subarea is extracted, and a trained Boosted classifier is used to implement classification; Hough transformation is carried out on the classified subareas to obtain a rotation angle of a bar code, and rotation correction is carried out onthe image; and gradient detection and Hough line segment detection are carried out on the corrected image to obtain an accurate bounding box of the bar code. The method can be used to detect bar codesin different rotation angles and with conditions as distortion, uneven illumination and partial shielding effectively. During detection, prior information and artificial marks are not needed; and theaccurate bounding box of the bar code can be obtained by detection, an accurate bar code area is provided for decoding later, the searching area and cost during decoding are reduced, and the decodingprecision is improved.
Owner:NANJING HUICHUAN IND VISUAL TECH DEV +1

Population global optimization method for regional dynamic subdivision based on local Lipschitz estimation

Provided is a population global optimization method for regional dynamic subdivision based on local Lipschitz estimation. The population global optimization method is combined with the Lipschitz estimation theory under the framework of a population evolutionary algorithm and comprises the steps of constructing a Lipschitz estimation lower bound bearing surface by extracting neighborhood information of new individuals to achieve dynamic subdivision of a search region; effectively identifying part of an invalid region by means of lower bound estimation information and guiding population update; performing local reinforcement by means of the general declining direction of a linear fit convex envelope, and performing secondary subdivision on the search region according to evolution information; reinitializing part of poor individuals in a population according to lower bound estimation selection information. The population global optimization method for regional dynamic subdivision based on local Lipschitz estimation is low in computing cost, and high in rate of convergence and reliability.
Owner:ZHEJIANG UNIV OF TECH

Photovoltaic multi-peak power point tracking method based on territory particle swarm

The invention relates to a photovoltaic multi-peak power point tracking method based on a territory particle swarm. The method comprises the following steps: 1) adjusting a duty ratio of a PWM as 0 toobtain output voltage of a Boost circuit; 2) setting the number of the particle swarm; 3) computing an adaptive value of each particle, re-judging and selecting a global optimal particle and the global optimal particle territory according to the obtained adaptive values; 4) determining a maximum value estimation range in the particle territory; 5) judging whether the condition that the maximum value estimation range contains the adaptive value of the global optimal particle is tenable; 6) judging whether the condition that the maximum distance dmax between the particles is less than 0.02Uocaris tenable; 7) computing each particle adaptive value, re-judging and selecting the global optimal particle; 8) judging whether the condition that the maximum distance dmax between the particles is less than 0.01Uocar is tenable; and 9) maintaining the output voltage as the voltage of the obtained global optimal particle location, and judging whether the environment changes suddenly.
Owner:TIANJIN UNIV

Systems and methods for reducing a search area for identifying correspondences between images

A system for reducing a search area for identifying correspondences identifies an overlap region within a first match frame captured by a match camera. The overlap region includes one or more points of the first match frame that are associated with one or more same portions of an environment as one or more corresponding points of a first reference frame captured by a reference camera. The system obtains a second reference frame captured by the reference camera and a second match frame captured by the match camera. The system identifies a reference camera transformation matrix, and / or a match camera transformation matrix. The system defines a search area within the second match frame based on the overlap region and the reference camera transformation matrix and / or the match camera transformation matrix.
Owner:MICROSOFT TECH LICENSING LLC

A dynamic fast acquisition method for satellite communication in motion

The invention discloses a satellite communication in motion rapid capturing method; the method comprises the following steps of 1, performing system initializing; 2, establishing a coordinate system;3, carrying out pre-adjustment of antenna pointing; 4, carrying out coarse capture of an antenna; and 5, carrying out accurate alignment of the antenna. The method is simple in steps, reasonable in design and convenient to implement, and pre-adjustment of antenna pointing is realized by utilizing the position and speed information of a carrier detected by a GPS module, so that the target communication satellite can be rapidly captured under different motion states of the carrier, the accurate alignment of the antenna and the target communication satellite is realized, the capture and fine alignment time is short, the stability of the antenna relative to the inertial space is ensured, the rapid response capability of the communication in motion system is improved, and the method is high inpracticability.
Owner:ROCKET FORCE UNIV OF ENG

A fast ranging method for pedestrians on the road ahead based on a vehicle-mounted binocular camera

The invention is a method for quickly measuring pedestrians on the road ahead based on a vehicle-mounted binocular camera, and discloses a binocular pedestrian detection and ranging method suitable for an automatic driving system. Methods Through the pedestrian detection method based on learning, the pedestrian detection model is trained, and the pedestrian detection model is used to detect pedestrians in the binocular scene. Calculate the matching points of the points selected in the left image detection results in the right image through the color features and scale invariant features, and calculate the disparity value between the matching pairs. The accurate parallax value of the detection result is obtained by finding the median value of the parallax, and the distance between the pedestrian and the camera is calculated according to the geometric relationship between the camera coordinate system and the image coordinate system. Method Aiming at the problems of slow calculation speed and inaccurate distance measurement in the existing methods based on binocular pedestrian detection and distance measurement, the road columnar model is used to speed up the detection speed, and multi-feature point matching is used to improve the accuracy of pedestrian distance measurement in road scenes. accuracy.
Owner:HUAZHONG UNIV OF SCI & TECH

Visual tracking method for mobile robot

The invention discloses a visual tracking method for a mobile robot. According to the method, a full-connection twin network tracking algorithm based on HOG feature similarity calculation and Kalman filtering feedback is used, HOG features based on color statistics are used as an appearance model, a plurality of similar targets in a scene are further distinguished, and identity jump of the targetsis reduced. Meanwhile, a Kalman filtering motion model is adopted, so that accurate prediction of the motion trail of the target is realized, the boundary frame is refined, the search area is reduced, the target shielding problem in the target tracking process is solved, and the calculated amount is reduced. And finally, the bounding box position information of the tracking target is transmittedto a visual servo system for controlling the robot. According to the method, the waste of computing resources caused by searching useless areas is effectively reduced.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

A Method of Face Detection and Tracking Based on FPGA

The present invention relates to a face detection and tracking method based on FPGA. Firstly, video is collected, and then skin color threshold detection is performed, and the collected video data is converted from YUV format into a binary image, and then spatial filtering is performed to determine skin color pixels, and then Time filtering, to obtain the average value of the pixels of the current frame, to further determine the skin color pixels, and then to filter other skin color interference, to perform face tracking, to obtain real-time face detection results, and finally to use VGA for real-time display. The invention overcomes the cost of existing human face detection and the real-time problem of detection and tracking, the algorithm is relatively simple, the accuracy, speed and real-time performance are high, and the system cost is low.
Owner:FUZHOU UNIV

A Lane Line Detection Method Combining Straight Line and Arc

The present invention provides a lane line detection method combining straight lines and circular arcs, which includes the following steps: S1, judging the driving scene by counting the gray histogram of the local area of ​​the image; S2, setting the area of ​​interest for lane line detection; S3 1. Construct a lane line width fitting function between the lower boundary of the image and the vanishing point; S4. Obtain the lane line candidate points, filter and link them, and obtain the straight line candidate points; S5. Use the upward search method to obtain the straight line using the least squares method And carry out screening, obtain the straight line of lane line candidate; S6, carry out the matching of lane line according to the width of lane and the angle limit of left and right lane line, obtain the detection result of straight line lane line; Collection of curves and arcs; S8, in the image coordinate system, the generation of lane line curves, arcs and curvature radii; it has the advantages of reasonable method, good adaptability, reduced hardware requirements, high accuracy and real-time performance.
Owner:合肥思艾智能科技有限公司

Integer ambiguity granularity changing determination method in single frequency receiving machine absolute positioning

The invention discloses a determination method of variable granularity of integer ambiguity of a single-frequency receiver in the absolute positioning, belonging to the technical field of satellite navigation and positioning and relating to a method for carrying out the single-point precise positioning by the single-frequency receiver in a satellite navigation positioning system with the utilization of the satellite carrier phase. The determination method is based on the utilization of the single-point static positioning LAMBDA algorithm to calculate the float solution and the distribution variance of the integer ambiguity, firstly carries out the rough integral mapping of the float solution to complete the roughening of the integral domain of search space, then utilizes the rough integral granularity to change the search region and carries out the search of the integer ambiguity according to search conditions to obtain the integral domain of the integer ambiguity; then the rough integral granularity is continuously reduced, the process is repeated till the rough integral granularity is equal to 1, then the search of the integer ambiguity is completed, and the precise carrier phase integer ambiguity is obtained. The use of the invention can rapidly, conveniently and reliably realize the carrier phase high-precision positioning of the single-frequency receiver and can be applied in the low-cost and high-precision navigation positioning system.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Method and system for detecting wafer distribution range and storage medium

The invention provides a method and system for detecting a wafer distribution range and a storage medium. The method comprises steps of 1, a data receiving step, receiving an image which is an image formed by photographing a wafer disc through a camera; 2, an image processing step, carrying out opening operation on the image, and removing single points in the image; performing closing operation on the image, and connecting adjacent areas in the image together; step 3, an image analysis step, finding out all closed areas in the image, and finding out corresponding contours; step 4, a searching step, after the line-by-line searching of the first closed area in the image is completed, jumping to the next closed area to perform the line-by-line searching till the searching of all closed areas is completed; and 5, recording, recording the search result in the step 4. The method is advantaged in that discontinuous closed areas can be quickly traversed without duplication or missing, and blank areas can be directly skipped without detection, so search areas are greatly reduced, and working efficiency is improved.
Owner:SHEN ZHEN TALUER TECH CO LTD

Cooperative construction method for enhancing realistic table-tennis system based on real rackets

The invention relates to a cooperative construction method for enhancing a realistic table-tennis system based on real rackets. The method comprises the following steps of: detecting and tracking a real table-tennis racket by utilizing the color characteristics according to a video image acquired by the system; designing and realizing the virtual-real three-dimensional registration of a virtual scene and a real scene, mapping the virtual scene to a video image coordinate system of the real rackets, participator users and real environment; designing and realizing the collision detection between a virtual table-tennis ball and objects, such as the real rackets, a virtual table-tennis table, a virtual table-tennis net, and the like according to the motion information of the real rackets and confirming and representing the motion trajectory of the virtual table-tennis ball after collision; and providing a finite state machine and a message-processing mechanism, controlling the conversion of various states of the table-tennis system in the operation process and ensuring a plurality of users to have the same table-tennis motion experience. The cooperative construction method can be widely applied to the fields, such as interactive digital entertainment, sports research, training simulation, remote education and training, and the like.
Owner:BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products