Criminology-oriented computer-assisted facial reconstruction method for skulls of unknown body sources

The invention belongs to the fields of forensic anthropology and computer graphics and relates to a criminology-oriented computer-assisted facial reconstruction method for skulls of unknown body sources. The criminology-oriented computer-assisted facial reconstruction method mainly includes steps of 1 three-dimensional modeling of a skull of an unknown body source, 2 gender discrimination of the skull of the unknown body source, 3 dense point based facial soft tissue rule analysis, 4 dense point registration based skull facial reconstruction method, 5 principal component analysis based facial estimation of the skull of the unknown body source, 6 generating of investigated photos based on three-dimensional facial model. The criminology-oriented computer-assisted facial reconstruction method can fast achieve facial reconstruction for skulls of unknown body sources, and can predict the facial features of victims before their death for criminal case investigation.

Spring model-based ball B spline tricot deformation simulation method

The invention discloses a spring model-based ball B spline tricot deformation simulation method. According to the method, deformation simulation is performed on a ball B spline structure-based tricot, a ball B spline is characterized by defining a series of control points, control radii of the control points and B spline curves associated with the control points to show 2D (two dimensional) and 3D (three dimensional) drawings, during operation, spring models are built among coils of the tricot based on a Hooke law, accurate deformation of the tricot can be realized by changing the ball B spline curve control points and corresponding depths, and storage efficiency and transmission efficiency are improved. The spring model-based ball B spline tricot deformation simulation method has the advantages that a parameterization method is adopted for computer three dimensional simulation on the weft knitting tricot, user interactive operation is facilitated, a tricot deformation model can be truly ...

Hair modelling modeling method based on static supercoiling model

The invention relates to the technical field of virtual human simulation, in particular to a hair modelling modeling method based on a static supercoiling model. The hair modelling modeling method based on the static supercoiling model includes the steps that growing points of hairs are initialized; parametric calculation is conducted on the hairs; a coordinate frame and coordinates of the hairs are computed; energy minimization calculation is conducted on the hairs; a new coordinate frame and coordinates of the hairs are computed; collision detection is conducted on the hairs; modeling is conducted on the hairs according to a ball B-spline curve. According to the hair modelling modeling method, hair strands can be constructed through ball B-splines, the hair modeling is optimized through energy minimization, and the obtained model can be used for various hair models of the virtual human.

Virtual restoration method for interactive broken relics

The invention relates to a virtual restoration method for interactive broken relics. The method comprises the steps that (1) relic piece data acquisition and classification are carried out; (2) three-dimensional model interaction based on Wiimote is carried out; (3) complementary splicing and virtual restoration of relic pieces are carried out; (4) relic virtual restoration based on template matching is carried out; and (5) relic entity restoration based on three-dimensional printing is carried out. According to the invention, an MSME three shaft accelerometer, a gyroscope and an infrared induction strip are used to realize interaction control of relic models; real-time calibration is carried out on MSME displacement and attitude 6 freedom degree information; the limitation of poor interaction control accuracy caused by gravity acceleration and poor MEMS sensitivity is overcome; the relic piece virtual restoration problems of two conditions that semantic relevance exists while a complementary ...

Dual-drive electronic parking system and vehicle

The invention relates to the technical field of vehicle parts, and discloses a dual-drive type electronic parking system and a vehicle, the dual-drive type electronic parking system comprises a support assembly and a brake caliper assembly, the support assembly comprises a fixed support and an auxiliary drive device, and the brake caliper assembly comprises a shell, a drive assembly and a brake execution assembly. A sliding guide assembly is arranged between the shell and the fixing support, the auxiliary driving device comprises an auxiliary motor, an auxiliary screw rod and an auxiliary thread sleeve, the auxiliary screw rod is connected with the auxiliary motor, the auxiliary thread sleeve is installed on the auxiliary screw rod, and during parking braking, the auxiliary motor is started, and the auxiliary thread sleeve extends and abuts against the shell. The auxiliary driving device is arranged in the support assembly, a dual-driving mechanism does not need to be arranged in the calipers ...

Hair modelling modeling method based on ball B-spline curve

The invention relates to the technical field of virtual human simulation, in particular to a hair modelling modeling method based on a ball B-spline curve. The hair modelling modeling method based on the ball B-spline curve includes the steps that growing points of hairs are initialized; parametric calculation is conducted on the hairs; a coordinate frame and coordinates of the hairs are computed; energy minimization calculation is conducted on the hairs; a new coordinate frame and coordinates of the hairs are computed; collision detection is conducted on the hairs; modeling is conducted on the hairs according to the ball B-spline curve. According to the hair modelling modeling method, hair strands can be constructed through ball B-splines, the hair modeling is optimized through energy minimization, and the obtained model can be used for various hair models of the virtual human.

Method for conducting upright correction on three-dimensional lie-down craniofacial models based on geodesic lines

The invention discloses a method for conducting upright correction on three-dimensional lie-down craniofacial models based on geodesic lines. The method includes the steps that first, for each craniofacial model, the uniform angle geodesic line in the model is extracted from a nasal tip point, each geodesic line is evenly divided according to the geodesic distance from the nasal tip point to the other end of the geodesic line, and the equal division points on the geodesic lines are used as features points of the corresponding three-dimensional craniofacial model; then, the motion vector from the feature point on each three-dimensional lie-down model to the corresponding feature point on an upright model in sample space is calculated, statistic models are established for the feature points and the motion vectors of the feature points, and the model change rules under the two different postures are counted. The motion vectors of the feature points of the lie-down craniofacial models to be ...

Magnesium hydride powder preparation method and device, magnesium hydride hydrogen storage rod and hydrogen storage method

The invention discloses a magnesium hydride powder preparation method and device, a magnesium hydride hydrogen storage rod and a hydrogen storage method, and the magnesium hydride powder preparation method comprises the steps of magnesium alloy raw material preparation, magnesium roller preparation, powder preparation, magnesium hydride powder preparation and packaging. The magnesium hydride hydrogen storage rod comprises a rod shell and a hydrogen flow guide pipe arranged in the rod shell, and a magnesium hydride powder box is arranged in the rod shell; an end cover is connected to a port of the rod shell in a sealing and covering manner; the hydrogen storage method comprises the steps of preparing the magnesium hydride powder cake and assembling the magnesium hydride hydrogen storage rod. The method has the advantages that compared with aluminum hydride, magnesium hydride prepared by the method is relatively low in price, relatively easy to prepare and beneficial to popularization and ...

Method for constructing three-dimensional blood vessel model based on ball B-spline curve

The invention provides a method for constructing a three-dimensional blood vessel model based on a ball B-spline curve, comprising the following steps of: step one: obtaining original data of a medical image; step two: separating blood vessel data from a background; step three: calculating a blood vessel skeleton line according to the blood vessel data; step four: calculating radius of the data points on the blood vessel skeleton line; step five: constructing the blood vessel model according to the skeleton line and corresponding point radius; and step six: visualizing the constructed blood vessel in a computer. The three-dimensional blood vessel model constructed by the method provided by the invention has the advantages of high precision and small error.

Method for measuring length and curvature of blood vessel of brain based on geodesic line

The invention relates to the technical field of blood vessel of brain quantitative analysis, in particular to a method for measuring length and curvature of blood vessels of a brain based on a geodesic line. The method for measuring the length and the curvature of the blood vessels of the brain based on the geodesic line includes the steps that a cerebral vascular area is extracted from image data, cerebral vascular surface structures are reconstructed, cerebral vascular networks are classified according to cerebral vascular communicated situations, two endpoints of each blood vessel are marked, and geodesic distance, normal curvature and geodesic torsion between the two endpoints are calculated. By means of the method for measuring the length of the blood vessels of the brain based on the geodesic distance, the topological structure of the blood vessels of the brain in three-dimensional space can be reflected well, and curvature degrees and morphological structures of the blood vessels ...

Simulation method of ball B-spline-based weft knitted fabric model

The present invention discloses a simulation method of ball B-spline-based weft knitted fabric model. According to the present invention, the ball B-spline-based constructed knitted fabric model is simulated. By defining a series of control points, a control radius of the control points and a B-spline curve associated with the control points, the ball B-spline reflects a 2D drawing and a 3D drawing. During the operations, by virtue of different construction manners of the coils, an effect diagram of any row and column of the weft knitted fabric can be obtained through computer simulation. By changing the colors at the different positions of the coil, the weft knitted fabrics having different patterns can be obtained. The present invention has the advantages that a 3D model can be conveniently and flexibly processed and deformed such that the storage and transmission efficiency is higher, the computer can practically simulate 3D models of weft knitted fabrics having different styles and ...

Overground step reservoir and building method thereof

Carrying vehicle

The invention provides a carrying vehicle, belongs to the technical field of carrying vehicles, and solves the problem that the front road condition cannot be observed when the existing carrying vehicle carries goods. The carrier comprises a carrier body, a damping assembly is arranged on the carrier body, a seat is arranged on the damping assembly, a fixing plate is arranged on the damping assembly, a transmission mechanism is arranged on the fixing plate, a first wheel is arranged on the transmission mechanism, a second wheel is arranged on the carrier body, a lifting mechanism is arranged on the carrier body, a pallet fork is arranged on the lifting mechanism, and a baffle is fixed to the pallet fork. A handle and a steering wheel are arranged on the vehicle body, the steering wheel is connected with the second wheel, a foot brake is arranged on the vehicle body, the foot brake is connected with the second wheel, a camera is arranged on the vehicle body, the camera is located on the ...

Underground step reservoir and building method thereof

Overground step reservoir and building method thereof

The invention discloses an overground cascade reservoir and a method for constructing the same, wherein, the overground cascade reservoir comprises a barrage, gravity flow conduits, a water inlet control valve well, a water outlet control valve well, a branch gully conservation reservoir, a conservation dam, offlets and a supply-water pump station. The construction method comprises the following steps that: (1) at first, the barrage is constructed in a main river; (2) the branch gully conservation reservoir is constructed; (3) the barrage and the conservation dam is communicated by the gravity flow conduits; (4) the supply-water pump station is constructed at the lower reaches of the main river or around the main river; (5) the offlets and the conduits of the main riverway are communicated. The invention has the advantages that: the reservoirs are positioned at the branch gullies of the two sides of the mountain area river and are easily controlled; when abundant, the water is conserved ...

Underground step reservoir and building method thereof

The invention discloses an underground cascade reservoir and a method for constructing the same, wherein, the underground cascade reservoir comprises at least two grooves, impermeable geomembranes paved at the bottoms of the grooves; a cutting undercurrent filter pipe arranged along the top of the impermeable geomembranes of the grooves, control valve inlet wells arranged at the downstream ends of the cutting undercurrent filter pipes; an impervious wall arranged at the downstream ends of the grooves, wherein, the control valve inlet wells are orderly connected by conduits being connected orderly. The construction method comprises the following steps that: (1) the grooves are dug; (2) impermeable parts are prepared; (3) the cutting undercurrent filters are paved; (4) the control valve inlet wells are arranged; (5) the conduits are paved. The invention has the advantages that: the underground cascade reservoir is constructed under the condition of the natural gradient of the natural hypsography ...

Pipeline fixing device for water supply and drainage construction and fixing method thereof

The invention discloses a pipeline fixing device for water supply and drainage construction and a fixing method thereof, and relates to the technical field of pipeline installing.The pipeline fixing device comprises a fixing base plate, two pairs of L-shaped supports are fixedly arranged on the two sides of the top face of the fixing base plate, L-shaped folded plates are arranged at the opposite top ends of each pair of L-shaped supports, and trapezoidal plates are arranged between the opposite bottom ends of each pair of L-shaped folded plates; an arc-shaped bottom plate is fixedly arranged between the top ends of the two trapezoidal plates, a pipeline is arranged in the arc-shaped bottom plate, a pair of arc-shaped side plates are arranged on the front side and the rear side of the pipeline, a plurality of U-shaped supports are fixedly arranged on the front side and the rear side of the bottom face of the fixed base plate, an L-shaped swing arm is arranged in a top end opening of each ...

YB25 packaging machine label paper auxiliary paper warehouse system and intermittent paper falling method

The invention discloses an auxiliary label paper warehouse system of a YB25 packaging machine and an intermittent paper falling method. The system comprises an auxiliary paper warehouse, a controller, a paper warehouse lifting device and an intermittent paper falling device. The paper warehouse lifting device is fixedly connected with the auxiliary paper warehouse and electrically connected with the controller and used for lifting the auxiliary paper warehouse to the outer side of the body paper warehouse or lowering the auxiliary paper warehouse to the position above the body paper warehouse. The intermittent paper falling device is installed on the auxiliary paper warehouse and the body paper warehouse, electrically connected with the controller and used for intermittently enabling the label paper in the auxiliary paper warehouse to fall into the body paper warehouse. The lifting type auxiliary paper warehouse is installed on the base paper warehouse of the YB25 packaging machine, and ...

Global automatic registering and modeling method based on depth images

The invention relates to a global automatic registering and modeling method based on depth images. The global automatic registering and modeling method includes the steps that a three-dimensional laser scanner collects the depth images of different view angles; the depth images are preprocessed; the adjoining depth images based on three congruent points are automatically registered; the depth images are globally registered based on a global feature point set; a registering result estimated based on a spindle is fed back; the depth images are fused. The global automatic registering and modeling method has the superior advantages that automatic rough registering of the adjoining depth images is achieved according to the information of the side length and angles through the three congruent points, and influence on the registering result by noise is lowered. By selecting corresponding points with the high stability and stable geometric attribute and the metric function of the corresponding ...