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1073 results about "Width ratio" patented technology

The width/depth (W/D) ratio is defined as the ratio of the bankfull surface width to the mean depth of the bankfull channel. The width/depth ratio is key to understanding the distribution of available energy within a channel, and the ability of various discharges occurring within the channel to move sediment.

Pedestrian identification method under road traffic environment based on improved YOLOv3.

InactiveCN109325418AVerify the recognition effectSolve the problem of difficult and slow target detectionBiometric pattern recognitionCluster algorithmRoad traffic
The invention discloses a pedestrian identification method under a road traffic environment based on improved YOLOv3. The method comprises the following steps of: S1, acquiring and pre-processing an image, and making a pedestrian sample set; 2, calculating the length-width ratio of the pedestrian candidate frames by using a clustering algorithm and the training set; 3, inputting the training set into the YOLOv3 network for multi-task training and saving the trained weight file; S4, inputting a picture to be recognized into the YOLOv3 network to obtain a multi-scale characteristic map; S5, using a logistic function to activate the x, y, confidence degree and category probability of the network prediction, and obtaining the coordinates, confidence degree and category probability of all prediction frames by judging the threshold value; S6, generating a final target detection frame and a recognition result by carrying out the non-maximum value suppression processing on the above result. The method of the invention solves the problem of low detection accuracy of the prior method, realizes the multi-task training, does not need additional storage space, and is high in detection accuracyand fast in speed.
Owner:SOUTH CHINA UNIV OF TECH

Target tracking method based on TLD (Tracking-Learning-Detection) algorithm

The invention relates to a target tracking method based on a TLD (Tracking-Learning-Detection) algorithm. The method comprises the steps of: initially selecting a target region from a first frame of image; by adopting a mid-value optical flow method, according to target region information in a previous frame of image, predicting a determined prediction target as a target tracking result; judging whether a number of pixel points in a current frame of image, which are occupied by the target region in the previous frame of image, is greater than a pixel threshold value; if yes, shortening the target region in the previous frame of image and the current frame of image according to a certain length-width ratio, and carrying out global traversal in a mode of a sliding window so as to obtain to-be-selected targets; if no, carrying out local region partitioning on the current frame of image, and carrying out local traversal in a mode of the sliding window so as to obtain to-be-selected targets; processing at least one to-be-selected target to form a target detection result; and according to the target tracking result and the target detection result, determining a target tracking region. According to the target tracking method disclosed by the invention, a detection module and a learning module of the TLD algorithm are improved, and real-time performance of target tracking is improved.
Owner:XIDIAN UNIV

Organic carrier for silver paste and preparation method thereof as well as silver paste containing organic carrier and solar cell manufactured from silver paste

The invention discloses an organic carrier for conductive silver paste applied to a front face electrode and a grid line of a solar cell, a preparation method of the organic carrier, silver paste containing the organic carrier and a solar cell manufactured from the silver paste. The organic carrier comprises the following components in percentage by weight: 60-75 percent of solvent, 1-10 percent of thickener, 0.3-5 percent of thixotropic agent, 1-5 percent of surfactant and 10-30 percent of plasticizer. The preparation method of the organic carrier comprises the following steps of: weighing various raw materials; adding various aids into a solvent respectively; and heating and stirring until the aids are dissolved completely. The organic carrier has proper viscosity and a simple preparation process. Paste prepared from the organic carrier has proper viscosity, fineness, leveling property, thixotropy and chemical stability. After the paste is subjected to screen printing and sintering on a cell substrate, the thicknesses of a front face electrode and a grid line thick film of a cell panel can be over 20 micros, and the prepared electrode and the grid line thick film can obtain a higher height-width ratio.
Owner:湖南威能新材料科技有限公司

Two-dimensional code coding method, two-dimensional code decoding method and two-dimensional code print

ActiveCN104143109AHigh coding densityAdapt to the needs of different practical applicationsRecord carriers used with machinesSensing by electromagnetic radiationComputer hardwareCoding decoding
The invention discloses a two-dimensional code coding method, a two-dimensional code decoding method and a two-dimensional code print. The two-dimensional code coding method includes the steps that a coding mode of input data is determined; the input data are converted to data code word streams; the error correction level, the line number M and the column number N are determined; error correction code words are generated and added to the position behind the data code word streams; a horizontal cutting line and a vertical cutting line of a two-dimensional code are generated, and the area defined by an outer frame of the two-dimensional code is cut into coding area blocks through the horizontal cutting line and the vertical cutting line; data code words to which the error correction code words are added are added to the coding area blocks, The two-dimensional code decoding method includes the steps that the two-dimensional code is scanned and a binary image is generated; a boundary image is generated; a frame image is generated; the coordinates of the vertexes of the coding area blocks are distinguished; the data code word streams are obtained; error correction is conducted on decoding data code word streams; the data are restored. The two-dimensional code is printed on the print. According to the two-dimensional code coding method, the two-dimensional code decoding method and the two-dimensional code print, high coding density is achieved, the length-width ratio of the two-dimensional code can be adjusted by adjusting the line number and the column number of the two-dimensional code, and therefore the different requirements of practical application can be met.
Owner:SHENZHEN YLINK COMPUTING SYST

Closed hydrostatic slideway

The invention provides a closed hydrostatic slideway which comprises a base and a sliding block arranged on the base. The upper surface of the base is provided with a horizontal supporting slideway and a vertical supporting slideway in sequence from bottom to top; the sliding block is inlaid in a groove formed by the base, the horizontal supporting slideway and the vertical supporting slideway; a hydrostatic oil cavity is arranged between the upper surface of the sliding block and the lower surface of the vertical supporting slideway; a hydrostatic oil cavity is arranged between the lower surface of the sliding block and the upper surface of the base; and a hydrostatic oil cavity is arranged between the side surface of the sliding block and the side surface of the horizontal supporting slideway. In the closed hydrostatic slideway, a groove structure with a certain depth-to-width ratio is not adopted, and all main precision surfaces are all of a plane structure and can be ground, thereby reducing the processing difficulty of the slideway. Meanwhile, since the slideway and the base are both made of granite materials with good heat stability, the precision of the slideway is ensured. The straightness error of the closed hydrostatic slideway can be 0.1 mu m/100mm, and the rigidities of the slideway in horizontal and vertical directions are both larger than 10000N/mu m.
Owner:XI AN JIAOTONG UNIV +1

Unmanned ship dynamic obstacle avoidance algorithm based on speed obstacle method and dynamic window method

The invention relates to an unmanned ship dynamic obstacle avoidance algorithm based on a speed obstacle method and a dynamic window method. On the basis of the speed obstacle method, the unmanned ship dynamic obstacle avoidance algorithm considers the characteristic of the ship's large length-width ratio, uses the ellipses to represent the unmanned ship and the obstacle, and gives a method for solving the ellipse tangents; considering the kinematic performance of the unmanned ship, only the speed and direction that the unmanned ship can reach in a given time is used to calculate obstacle avoidance; the starting time of obstacle avoidance is determined by comparing the time of collision with the time required for the unmanned ship to avoid the obstacle, and the obstacle avoidance is endedby determining that the unmanned ship is safely moving in the desired direction of the navigation and moving in the direction of the target point; and the virtual obstacle is added according to the speed and movement direction error of the obstacle to reduce the influence of the obstacle motion information error. The unmanned ship dynamic obstacle avoidance algorithm can ensure that the unmanned ship can effectively avoid the static and dynamic obstacles encountered during the autonomous navigation on the sea surface.
Owner:SHANGHAI UNIV

Superfine flat terylene low elater and technique for producing the same

The invention relates to a superfine, flat, terylene and low-stretch yarn and a production technology thereof. The invention is characterized in that the superfine, flat, terylene and low-stretch yarn has the specification of (55-444)dtex/(144-576)f, the single yarn density is smaller than or equal to 0.58dtex, and the cross section shape of the yarn is a rectangle with a length-width ratio which is larger than or equal to 2. The invention adopts a fused mass direct spinning production mode and a two-step POY-DTY method production line for production; an outer ring blowing cooling mode is adopted, and a spinneret plate with a straight spinneret orifice is used in a spinning working procedure, and the spinneret plate has a high length-width ratio which is larger than or equal to 2; a pentaerythritol additive capable of changing the rheological property and the spinnability of fused mass is added in a polyester working procedure; and integrative production measures, such as a special extending deformation technology, and the like, are adopted in a false twisting working procedure. Fabrics woven by the superfine, flat, terylene and low-stretch yarn have the advantages of soft feeling, good moisture absorption and ventilation, elegant luster, good hair uprightness, easy dying, and the like as well as higher product added value.
Owner:JIANGSU SHENGHONG CHEM FIBRE CO LTD

Fourier descriptor and gait energy image fusion feature-based gait identification method

The invention relates to a Fourier descriptor and gait energy image fusion feature-based gait identification method. The method comprises the steps of performing graying preprocessing on a single frame of image, updating a background in real time by using a Gaussian mixture model, and obtaining a foreground through a background subtraction method; performing binarization and morphological processing on each frame, obtaining a minimum enclosing rectangle of a moving human body, performing normalization to a same height, and obtaining a gait cycle and key 5 frames according to cyclic variation of a height-width ratio of the minimum enclosing rectangle; extracting low-frequency parts of Fourier descriptors of the key 5 frames to serve as features I; centralizing all frames in the cycle to obtain a gait energy image, and performing dimension reduction through principal component analysis to serve as features II; and fusing the features I and II and performing identification by adopting a support vector machine. According to the method, the judgment whether a current human behavior is abnormal or not can be realized; the background is accurately modeled by using the Gaussian mixture model, and relatively good real-time property is achieved; and the used fused feature has strong representability and robustness, so that the abnormal gait identification rate can be effectively increased.
Owner:WUHAN UNIV OF TECH

Superconductive nanowire single-photon detector with self-gain structure

ActiveCN106289515AReduce time domain jitterTime Domain Jitter ReductionPhotometry electrical circuitsPower flowNanowire
The invention discloses a superconductive nanowire single-photon detector with a self-gain structure. The single-photon detector comprises a first nanowire used as a photosensitive area and a second nanowire used as a self-gain area. The first nanowire is connected with the second nanowire in parallel. The width ratio of the second nanowire to the first nanowire is N, wherein N is larger than 1. The first nanowire is used for detecting photons. The second nanowire is used for storing current, thereby achieving amplifying of pulse signals. A parallel branch of the first nanowire and the second nanowire is connected with a third nanowire in series. The width of the third nanowire is the sum of the width of the first nanowire and the width of the second nanowire. The length of the second nanowire is used for controlling inductance proportion of the first nanowire and the second nanowire. By adjusting the length of the second nanowire, the length proportion of the first nanowrie and the second nanowire is controlled, thereby controlling the inductance proportion, so the first nanowire and the second nanowire are allowed to be in a high-bias current state. The third nanowire is used for increasing total inductance of the branch. By controlling the length of the third nanowire, the total inductance of the branch is controlled, thereby avoiding a thermal latch-up effect.
Owner:TIANJIN UNIV
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