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280results about How to "Resistance to deformation" patented technology

Video copy detection method and system based on soft cascade model sensitive to deformation

InactiveCN102737135AEasy to detectReduce the cost of time and spaceSpecial data processing applicationsTime domainFiltration
The invention provides a video copy detection method and a video copy detection system based on a soft cascade model sensitive to deformation. The method comprises the following steps of: preprocessing, namely extracting vision key frames and audio frames of which the formats are consistent from an inquiry video; identifying deformation, namely distinguishing the type of the deformation of the inquiry video, and transmitting the type information to a cascade detector chain corresponding to the type; and detecting, namely sequentially processing the inquiry video by detectors in the cascade detector chain until a certain detector determines that the inquiry video is a copy or all the detectors determine that the inquiry video is not a copy, wherein in a certain detector, the vision key frames or the audio frames of the inquiry video are searched according to a vision characteristic or an audio characteristic; and then a time domain pyramid trusted platform module (TPM) is used for integrating search results of the frame layers into a copy detection result of a video layer. According to the method and the system, whether the inquiry video is a copy of a given reference video base can be accurately and quickly distinguished; and the method and the system have great significance in application to the fields of digital copyright management, advertisement tracking, video content filtration and the like.
Owner:PEKING UNIV +1

Design method of bionic spider web composite material structure

The invention discloses a design method of a bionic spider web composite material structure, comprising seven steps as follows: (1) performing static force analysis on stress of an original structure by finite-element analysis software to obtain a stress deformation cloud chart of the structure; (2) finding out the position of the maximum deformation region from the deformation cloud chart of the structure; (3) selectively arranging annular and arc-shaped regular latitudes and regular longitudes, wherein the maximum radius thereof is equal to or larger than the radius of the maximum deformation concentrated region; (4) arranging the regular longitudes in the mode that the regular longitudes are diffused to the periphery along the centers of the annular and arc-shaped regular latitudes, wherein the density of the longitudes is determined according to the order of magnitude of deformation of the maximum deformation concentrated region and the maximum deformation region; (5) arranging irregular longitudes along the gradient direction of deformation of the regions outside the maximum deformation concentrated region; (6) removing parts of materials from the sections of the structure having smaller stress deformation so as to form a hollow structure and reduce the whole mass of the structure; and (7) performing repeated design improvement on the original structure based on the above steps until the requirement is met.
Owner:BEIHANG UNIV

Redundant drive five degrees of freedom parallel machine tool with large rotation angle

The invention relates to a redundant drive five degrees of freedom parallel machine tool with a large rotation angle. The redundant drive five degrees of freedom parallel machine tool with the large rotation angle includes a fixed platform, a movable platform for installing a main shaft head and a first driving branch, a second driving branch, a third driving branch and a fourth driving branch forconnecting the fixed platform and the movable platform, the structures of the first driving branch and the second driving branch are similar, and the first driving branch includes a hooke hinge, a servo driving unit, a revolute pair and a compound sphere hinge; the third driving branch includes a hooke hinge, a servo driving unit and a compound sphere hinge, the fourth driving branch includes a revolute pair, a servo driving unit, a hooke hinge and a revolute pair, and the movable platform of a machine tool and the four driving branches are hinged to form a space closed-cycle parallel mechanism; and the three-dimensional translation and the two-dimensional rotation of the space can be achieved by controlling six servo motors to drive the four branches. The redundant drive five degrees offreedom parallel machine tool with the large rotation angle has the advantages that the branch structures are simple and compact, the orientation workspace is large, the flexibility is high, the rigidity is large, and the singular configuration can be prevented, and can be used for high-speed, high-precision and efficiency machining for free-form surface in complex space.
Owner:BEIJING JIAOTONG UNIV
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