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

1465 results about "Point counting" patented technology

Distributed connection-oriented services for switched communication networks

Method and apparatus providing connection-oriented services for packet switched data communications networks. Directory services include distributed discovery of MAC addresses and protocol alias addresses. Topology services include a link state topology exchange among switches, which provides each switch with a complete topology graph of the network. This enables an access switch receiving a data packet to determine a complete path from a source end system to a destination end system. Another service includes resolution of broadcast frames to unicast frames, in order to reduce the amount of broadcast traffic. Policy restrictions may be applied prior to connection setup. Path determination services enable multiple paths from a source to a destination. Connection management includes source routed mapping of connections on the desired path. A distributed call rerouting service is provided wherein if a link on an active path fails, each switch receives a topology change notification and unmaps any connection involving the failed link. A broadcast/unknown service provides restricted flooding of nonresolvable packets. Furthermore, connection-oriented switching is provided based on the source and destination MAC addresses as a connection identifier. Still further, resolution of networks outside the switch domain is enabled by access switches listening for network and server route advertisements and maintaining best routes to said networks and servers. The best route metrics may be combined with best path metrics to determine a path from a first access switch to an egress switch connected to the external network.
Owner:EXTREME NETWORKS INC

Method for coding quick movement estimation video based on macro block characteristics

The invention discloses a method for coding a quick movement estimation video based on macro block characteristics, relating to the field of video compression coding. The method comprises the following steps of: firstly, extracting brightness information of a current coding macro block from original video data; secondly, searching and designing a simple movement estimation search template aiming at an integral pixel movement vector and reasonably distributing search points; classifying movement sever degree of the current prediction macro block according to distortion principle, making a movement searching prior stopping strategy corresponding to movement characteristics from the movement characteristics of the current prediction macro block, dynamically adjusting the number of search layers and search points of the movement estimation and adaptively selecting a corresponding movement estimation search principle. Compared with the movement estimation search method adopted in a video coding standard H.264, the method can effectively accelerate the movement estimation search process, reduces the movement estimation time consumption, strictly controls the code rate increase, ensures better reconstructed Image quality, and realizes quick movement estimation coding.
Owner:BEIJING UNIV OF TECH

Rapid extraction and reconstruction method for data power line of airborne LIDAR

The invention provides a rapid extraction and reconstruction method for a data power line of an airborne LIDAR. The method comprises the following steps of: acquiring a large amount of laser point cloud data by using an airborne laser radar measurement system, and filtering the laser point cloud data by properly setting an elevation threshold value to reject point cloud data not formed by a power line; after the filtration of the point cloud data is finished, rejecting a pylon according to the variation characteristics of point cloud density on the two sides of the pylon; counting the point number of each layer of power line in the point cloud data of the power line by adopting a histogram counting analysis method, layering the power line, and fitting the power line in the same layer, thereby separating point cloud data on a single power line; and fitting the power lines by utilizing a catenary equation, estimating a catenary equation parameter, and finally realizing the vectorization of the power line. By the method, automatic power line extraction and pylon extraction between a plurality of spans can be rapidly realized, and extraction efficiency is high; and the method can be used for the transmission line safety inspection of a power sector, and transmission line inspection efficiency is greatly improved.
Owner:CHINESE ACAD OF SURVEYING & MAPPING

WLAN (Wireless Local Area Network) indoor KNN (K-Nearest Neighbor) positioning method based on near-neighbor point number optimization

The invention relates to a WLAN indoor KNN positioning method based on near-neighbor point number optimization, which relates to the field of mode identification and solves the problem of reduced positioning precision caused by improper near-neighbor point number selection in the traditional WLAN indoor KNN positioning method. The WLAN indoor KNN positioning method comprises the following steps of: firstly establishing a complete WLAN positioning scene and a position fingerprint database; then, pre-estimating the position of a testing point according to the collected signal intensity at the testing point and the pre-stored position fingerprint data by utilizing a KNN positioning method with the near-neighbor number as 2; then obtaining the theoretical expected error of the testing point at a pre-estimated position by the KNN positioning method when the near-neighbor point numbers are 1 and 2, and selecting the near-neighbor point number corresponding to the KNN positioning method with higher theoretical precision as the optimum near-neighbor point number for estimating the position of the testing point; and finally realizing WLAN indoor KNN positioning by utilizing the KNN positioning method under the optimum near-neighbor point number. The invention is applicable to indoor positioning.
Owner:HARBIN INST OF TECH

Method for detecting interlaced material and field order

A (50) method and apparatus (110) for determining a scanning format of a frame of a video signal determines (52) if any interfield motion exists within the frame; and indicates (53) that the frame is interlaced scanned if interfield motion is detected and indicates (54) that the frame is progressive scanned if interfield motion is not detected. The determination is based on spatial correlation within and around one or more edges of one or more objects in the frame. This can be accomplished by identifying zig-zag or zipper effects near one or more edges of one or more objects in the frame, identifying motion between fields or identifying motion near one or more edges of one or more objects. A method (100) for determining a field order of two interlaced frames of a video sequence of frames assigns (101) one of the two interlaced frames to be a first frame and the other of the two interlaced frames to be a second frame and assembles (102) two new frames from the two interlaced frames by combining a bottom field of the first frame with the top field of the second frame and by combining a top field of the first frame with a bottom field of the second frame. The number of zipper points in each of the two new frames is then determined and compared. If the number of zipper points in the first frame is smaller than the number of zipper points in the second frame, that the field order of the two frames is top field first, otherwise the field order is bottom field first.
Owner:GOOGLE TECH HLDG LLC

Non-equal probability constellation labeling method based on absolute phase shift keying (APSK) constellation diagram

Disclosed is a non-equal probability constellation labeling method based on an absolute phase shift keying (APSK) constellation diagram. The non-equal probability constellation labeling method based on the APSK constellation diagram is characterized by comprising the steps that: the APSK constellation diagram is constructed, number of steps of the constellation labeling is M, M=2m, and m is a positive integer, numbers of constellation points on each ring is the same, phase deviations of each ring are also the same; a constellation labeling mode of the APSK constellation diagram is designed, and the constellation labeling mode is enabled to be a gray labeling; the constellation points are grouped, and constellation points on the same ring are combined to be a new constellation point; labeling bits of the prior constellation points on the same ring are distributed to the new constellation point in sequence. According to the non-equal probability constellation labeling method based on the APSK constellation diagram, the inhomogeneous constellation diagram and a non-equal probability labeling technology are adopted, distribution of output signals of the constellation labeling is enabled to be close to Gaussian distribution, shaping gain is achieved, performance of a coded modulation system is improved, and signal to noise ratio in a modulation process is reduced.
Owner:TSINGHUA UNIV +1
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products