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290 results about "Real size" patented technology

Improved VFH algorithm-based positioning and obstacle avoidance method and robot

ActiveCN103926925ASolve the obstacle avoidance path planning problemPosition/course control in two dimensionsLaser rangingHome environment
The invention provides an improved VFH algorithm-based positioning and obstacle avoidance method and robot. According to the improved VFH algorithm-based positioning and obstacle avoidance method and robot, on the basis of an improved vector field histogram method and a scan matching algorithm, environmental information is acquired by the adoption of a laser range-finder sensor, and the pose error brought by speedometer is amended by the adoption of the polar coordinate scan matching algorithm. After robot positioning is finished, environmental information is rasterized, an obstacle is expanded according to the relationship between the robot and the obstacle and considering the sensing uncertainty of a movable robot and the real size of the robot, an original polar coordinate histogram is built, the free walking area and the obstacle avoidance area are acquired, a binary polar coordinate histogram is acquired through the definition of two threshold values, a shielding polar coordinate histogram is built through estimating the movement trail of the movable robot, and finally, the cost function is introduced to determine the best movement direction of the robot so as to solve the problem of shielding route planning of the movable robot in a home environment.
Owner:江苏久祥汽车电器集团有限公司

Creation Of Visual Composition Of Product Images

A computerized method for creating in a computer system a visual composition. One or more photographs are provided, including respectively images of products for presenting in the visual composition. The images are outlined producing outlines of the product images. Based on the outlines, an arrangement is selected from multiple previously defined arrangements. The arrangement becomes the selected arrangement for presenting the images in the visual composition. The images are positioned in the selected arrangement based on at least one previously defined rule. A set of metadata is preferably associated with each photograph and / or with each product; and the selection of the selected arrangement is performed based on the metadata and / or on extractable features. Scaling of the images is preferably based on the metadata or on extractable features. Features of the products in the images are preferably extracted based on the outline or from a database. Extractable features include: orientation of the product in the image, lighting at time of capture, camera position at time of capture, faces showing of the product in the image, a rotation angle of the product in the image, a line of symmetry of the product, a scale ratio of product dimension to image dimension, a diagonal of the outline, product meta data, product category, product orientation, product real dimensions, and product colors.
Owner:REVIONICS

A method and device for measuring the opening width of a shield tunnel lining segment joint

The invention relates to a measuring method of a shield tunnel lining segment seam open width and an apparatus thereof. The method comprises the following steps: using a computer vision kit to demarcate cameras, collecting segment seam images through the digital cameras and determining a shooting distance through a laser range finder; converting the collected images into grayscale images, selecting an appropriate filtering parameter and using a Gauss filter to smooth the images in a selected region of interest (ROI); determining a maximum threshold and a minimum threshold after the images aresmoothed and carrying out Canny lag threshold segmentation so as to obtain a sub-pixel linear characteristic of the images and a segment seam edge; screening needed sub-pixel segment seam edge imagesfrom the sub-pixel linear characteristic; using a normal vertical minimum distance method to respectively calculate a largest width and a mean width according to the obtained two sub-pixel segment seam edge images; determining a conversion proportion between a pixel dimension and an actual dimension according to a predetermined internal parameter of the cameras and calculating so as to obtain an actual width of the segment seam. The method and the apparatus have advantages of low costs and high precision. The method can be used rapidly and conveniently.
Owner:TONGJI UNIV

Method and device for realizing monitored video display

The invention discloses a method and a device for realizing monitored video display, so as to realize monitored video display based on positioning and tracking. The method comprises steps: a three-dimensional model of a building is acquired, and according to the actual size, the geographic coordinates and the azimuth information of the building, the three-dimensional model of the building is mapped to a three-dimensional geographic coordinate system; the positioning coordinates of a positioned object are acquired; the positioning coordinates of the positioned object are converted to three-dimensional geographic coordinates in the three-dimensional geographic coordinate system as three-dimensional geographic coordinates of the positioned object; the position coordinates of a monitoring and photographing device in the building are converted to three-dimensional geographic coordinates in the three-dimensional geographic coordinate system as the three-dimensional geographic coordinates of the monitoring and photographing device; and according to the three-dimensional geographic coordinates of the positioned object and the three-dimensional geographic coordinates of the monitoring and photographing device, a monitoring and photographing device with a distance with the positioned object in a preset range is determined as a called monitoring and photographing device, and a monitored video and/or an image of each called monitoring and photographing device are/is acquired to be displayed.
Owner:北斗智图科技(北京)有限公司

Testing device and method for automatic parking system

ActiveCN104176051AMeet the needs of finding calibrationVehicle testingWheel speed sensorSystem testing
The invention provides a testing device for an automatic parking system. The testing device comprises a parking controller and a test-bench, wherein the parking controller as the main controller of the automatic parking system is placed on the test-bench; a wheel is arranged at the lower part of the test-bench; a wheel speed sensor is arranged on the wheel shaft of the wheel; an ultrasonic wave sensor is arranged on at least one side surface parallel to the test-bench in the moving direction of the test-bench; the wheel speed sensor and the ultrasonic wave sensor are electrically connected with the parking controller; a parking space recognition algorithm, a parking space compensation algorithm, a parking space actual size and various working condition patterns are built in the parking controller used for verifying the accuracy of the parking space recognition algorithm and standardizing the parking space compensation algorithm when the test-bench simulates various parking working condition patterns of automobiles. Correspondingly, the invention provides a testing method applied in the testing device. According to the invention, the testing device for the automatic parking system and the testing method applied in the testing device are low in cost and short in testing time, and can simulate various parking working condition patterns.
Owner:WUHU LION AUTOMOTIVE TECH CO LTD

Skin mirror image milling numerical control program fast generating method based on features

A skin mirror image milling numerical control program fast generating method based on features includes: performing machining area division according to machine tool travel and the actual size of a skin piece, and identifying skin piece area features; determining the frame bent distribution information of each machining area and information such as feature machining sequence and cutting parameters of the current area, and building a skin middle layer process curved surface for automatic tool trajectory calculation; performing automatic numeral control programming based on the features on a machine tool spindle and top support according to tool trajectory information, adjusting frame bent positions through interference judgment, and outputting a final numerical control program for driving the machine tool to perform fast machining. The method has the advantages that by the skin mirror image milling fast numerical control programming based on the features, the tool trajectory compiling cycle is shortened, automatic numerical control programming of the machining spindle and automatic numerical control programming of the top support are achieved, programming's dependence on human experience is reduced, programming standardization is guaranteed, programming quality is increased, and programming efficiency is increased at the same time.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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