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331 results about "Relative space" patented technology

Head-mounted type virtual reality device and virtual reality system

The invention discloses a head-mounted type virtual reality device. The device comprises a shell, a head-mounted display, a plurality of positioning light beam receivers and a processor. The head-mounted display is located in the shell and used for displaying a three-dimensional virtual scene. The positioning light beam receivers are embedded in the outer surface of the shell and used for receiving positioning light beams which conduct sweeping in a laser positioning base station according to a preset sweeping period. The relative space position relations between the positioning light beam receivers are fixed. The processor is located in the shell and used for determining the position of the head-mounted type virtual reality device according to the times when the four positioning beam receivers receive the positioning light beams respectively, the sweeping period, the relative space position relations and a preset position of the positioning light beam emitting device. Therefore, when a three-dimensional virtual image is shown to a user through the head-mounted type virtual reality device, position information of the user can be determined. Therefore, the position information of the user can be displayed in the virtual scene through the head-mounted type virtual reality device, and interaction between the user and the virtual reality scene can be achieved.
Owner:BEIJING G WEARABLES INFORMATION SCI & TECH

Method and system for laser marking in the volume of gemstones such as diamonds

A method and an apparatus for laser marking indicia in the volume of gemstones such as diamonds, the indicia being made up of a plurality of microscopic dot-shaped marks whose build-up can be initiated by exposing naturally-occurring internal defects or impurities in the volume of a gemstone to a tightly focused train of laser pulses. Authentication data is encoded in the gemstone from the relative spatial arrangement of the dot-shaped marks that form the indicium. Taking advantage of the presence of otherwise invisible defects in the gemstone allows for inscribing indicia with laser pulses carrying energies substantially lower than the threshold energy required for inscribing in the volume of a perfect gemstone material. The marking process is then much less susceptible to inflict damages to the surface of the gemstone, and the marking can be performed using a broad variety of femtosecond laser systems. The dot-shaped marks engraved at a depth below the surface of a gemstone can be made undetectable with the unaided eye or with a loupe by limiting their individual size to a few micrometers, while devising indicia made up of only a few marks. As a result, the marking does not detract from the appearance and value of the gemstone. The procedure for laser marking accounts for the random spatial distribution of the defects present in natural gemstones as well as for their strongly localized character. The presence of an indicium can be detected by using a dedicated optical reader that can be afforded by every jewellery store.
Owner:GEMOLOGICAL INST OF AMERICA INC

Infrared vision based automatic landing guidance method and system applied to fixed-wing UAV (unmanned aerial vehicle)

The invention discloses an infrared vision based automatic landing guidance method and system applied to a fixed-wing UAV (unmanned aerial vehicle). The system comprises two identical image tracking modules, an image processing module, a control module and a wireless transmission module, wherein each image tracking module comprises a camera and biaxial pan-tilt units. According to the method, the UAV is detected, identified and tracked in images with an image tracking technology, and deflecting angles of the pan-tilt units are accurately recorded; the relative space position of the UAV can be determined through geometric relationship analysis and trigonometric calculation of pitch heading angles of the two pan-tilt units and the distance between the pan-tilt units, and position information of the UAV is sent to the UAV through the wireless transmission module, so that the UAV is guided to accurately land. The infrared vision based automatic landing guidance system is constructed on two sides of a landing runway of the UAV, complicated image processing is performed based on powerful computing capacity of a ground-based computer, each guidance device is utilized to the greatest extent, the accuracy of the system is improved, the control is simple, and real-time performance and stability are good.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Image retrieval method, device and system

The invention discloses an image retrieval method, an image retrieval device and an image retrieval system, wherein the image retrieval method comprises the following steps: extracting the local features of a query image, and quantizing the local features into visual words; querying a preset visual-word inverted list in an image database by using the visual words so as to obtain matched local-feature pairs and matched images; respectively carrying out space encoding on relative space positions between matched local features in the query image and the matched images so as to obtain a space code picture of the query image and space code pictures of the matched images; executing a space consistency check on the space code picture of the query image and the space code pictures of the matched images so as to obtain the number of the matched local-feature pair in conformity with the space consistency; and according to the numbers of the matched local-feature pairs (in conformity with the space consistency) of different matched images, returning to the matched images according to the similarity of the matched images. By using the method provided by the invention, the image retrieval accuracy and the retrieval efficiency can be improved, and the time consuming for retrieval can be reduced.
Owner:UNIV OF SCI & TECH OF CHINA

Three-dimensional positioning and attitude-determining method and system for track detection platform in dynamic environment

The invention provides a three-dimensional positioning and attitude-determining method and a system for a track detection platform in a dynamic environment. The method comprises the steps of calibrating the relative spatial positions and attitudes of the left and right cameras of a binocular stereo camera; calibrating the relative position and attitude parameters of the binocular stereo camera relative to the laser inertial navigation; taking the photos of a CPIII control point by means of the binocular stereo camera to obtain multiple photos of the control point; obtaining the position and the attitude of the binocular stereo camera through the stereo intersection process; adopting the position and the attitude of the binocular stereo camera as weighted observation values and inputting the weighted observation values into an INS/OD navigation system for filtering, smoothing and interpolating treatments so as to obtain the positioning and the attitude of the track detection platform. According to the technical scheme of the invention, the data of a track line high-precision control network and the data of an inertial navigation meter /speedometer are fused based on visual techniques, and the combined resolving method is adopted. In this way, the continuous and high-precision positioning and attitude-determining effect of the dynamic track detection platform is realized. The method and the system can be widely applied to the track detection of high-speed rails and subways, and the mobile road measurement.
Owner:SHENZHEN UNIV

Construction method for manufacturing multi-pipe intersecting steel pipe component

The invention relates to a construction method for manufacturing a multi-pipe intersecting steel pipe component and belongs to the technical field of steel structure manufacturing. The construction method is characterized in that: 1) intersecting lines are drawn by adopting three-dimensional AutoCAD modeling and circumference bisecting tessellation line methods, thereby filling the blank that most intersecting line software in markets cannot solve the problems of complicated intersecting line forms that the axes of multi-pipe intersecting and intersecting steel pipes are not intersected on one point, the steep pipe is intersected with a steel plate and the like; 2) a sample figure is printed in a ratio of 1 to 1 instead of a conventional manual lofting method ; 3) relative space relations among cross lines of a main pipe and branch pipes are found out by a computer, a method combining projection, space angles and characteristic points and lines is used as a method for positioning manufacturing spaces, so that a great amount of investment in high-precision measurement instruments is saved, and the method is the low-cost, high-efficiency and high-precision method for measuring and positioning the spaces; and 4) a welding method is adopted for welding lines of large-diameter and small-angle intersecting lines by combining internal and external groove welding and internal and external welding, so the problem that the welding lines of the roots of the intersecting lines cannot be fully welded is solved.
Owner:王正怡 +2
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