686results about How to "Low resolution" patented technology

The invention, which relates to the stereoscopic vision field, discloses a depth image acquisition method based on combination stereo matching and structured light. With the method, a problem of stereo matching realization at an image weak texture region under insufficient image exposure can be solved. When external environmental light is sufficient and no weak texture region exists in a shooting scene, depth information of a three-dimensional scene is obtained by using an image shot under natural light directly; and when a little texture information is collected or the external environmental light is weak during the collection process, a coded structured light is projected actively, thereby enhancing the structured light intensity and object texture information. Because the structured light is processed by scene regulation while the scene texture information is enhanced, the scene depth information can be obtained by using a structured light measuring method directly. The depth image acquisition method is suitable for obtaining the object depth information accurately.

The invention provides a preparation method for an Al2O3 hollow sphere / aluminum porous composite material, relates to a preparation method for an aluminum-based porous composite material, which solves the problems that the strength of a traditional foam aluminum material is low, the process conditions are harsh and the cost is high in an existing preparation method. The preparation method 1 comprises the following steps: step 1. filling an Al2O3 hollow sphere; step 2. pre-heating; step 3. pouring; step 4. pressurizing and immersing; and step 5. maintaining pressure, cooling and carrying out de-molding to obtain the Al2O3 hollow sphere / aluminum porous composite material. The preparation method 2 comprises the following steps: step 1. mixing the Al2O3 hollow spheres with different grain diameters and filling; step 2. pre-heating; step 3. pouring; step 4. pressurizing and immersing; and step 5. maintaining pressure, cooling and de-molding to obtain the Al2O3 hollow sphere / aluminum porous composite material. The Al2O3 hollow sphere / aluminum porous composite material is prepared by immersing aluminum or aluminum alloy into a gap between Al2O3 hollow ball prefabricated blocks; porous structure characterizes of the Al2O3 hollow spheres are maintained and a strengthening mechanism of the aluminum-based composite material is introduced, so that the mechanical properties of materials are improved. According to the preparation method, the operation is convenient, the cost is low, the process is simple, and the production cost is reduced.

The invention discloses a method for calculating the thickness and the weight of ice coating on an overhead transmission line of a tangent tower. The method comprises the following steps of: 1, calculating basic mechanic parameters of a wire at ice coating temperature but without ice coating in a vertical plane according to the design parameters; 2, calculating height difference angle in a wind deviation plane, wire horizontal stress, wire deadweight ratio load in a vertical direction, horizontal span and wire length from the lowest point of a wire of big and small side towers to a main tower according to the wind deviation angle of an isolator string measured by a sensor; and 3, establishing a relation expression between the tilt angle of the isolator string in the wind deviation plane and the wind deviation angle of the isolator string in the wind deviation plane and the tilt angle of the isolator string in the vertical plane, and establishing an equation of load balance in the vertical direction after the ice coating in the wind deviation plane, and calculating the thickness and weight of equivalent ice coating of the wire. The method has the advantages of reducing the equipment quantity, and improving the calculation precision and the accuracy and the reliability of the calculation result.

The invention discloses an energy consumption balancing method in a wireless ultraviolet light cooperative unmanned aerial vehicle formation network. An ultraviolet light non-line-of-sight single scatter communication model is established; an energy attenuation formula of channels in an ultraviolet NLOS(c) class communication mode is determined; and on the basis, energy consumption analysis is carried out on unmanned aerial vehicle formation in flight through adoption of a wireless ultraviolet light communication energy consumption model. Through circulation of three phases of cluster head selection, cluster establishment and stable data transmission, clustering management is carried out on the unmanned aerial vehicle formation, so a purpose of balancing network energy consumption is achieved. According to the method provided by the invention, through combination of the advantages of wireless ultraviolet light scatter communication, the energy consumption balancing is carried out on the unmanned aerial vehicle formation based on a clustering topology management mechanism, energy allocation of the unmanned aerial vehicle formation can be effectively optimized, and survival time of the unmanned aerial vehicle formation is prolonged.

The invention provides an outdoor large-scale scene three-dimensional mapping method fusing multiple sensors. The implementation process is divided into two modules, namely a visual inertia odometer module, and a laser odometer and mapping module. The visual inertia odometer module comprises optical flow tracking, IMU pre-integration, initialization, sliding window optimization, marginalization and word bag model establishment. The laser odometer and mapping module comprises point cloud segmentation, point cloud distortion removal, feature extraction and inter-frame matching, loopback detection and mapping. Compared with a single radar mapping scheme, the high-frequency pose of the visual inertia odometer is fused, and the method has the advantages of being good in point cloud distortion removal effect, high in loopback detection precision and high in mapping precision. The problem that an outdoor large-scene three-dimensional map is low in precision is solved, and a breakthrough is provided for further development of unmanned driving.

When a two-dimensional code having data cells (referred to as DC) comprising two-dimensional data, positioning finder patterns (referred to as FP) and an alignment pattern (referred to as AP) is input, the positions of FP are detected by evaluating the proximity from patterns in three horizontal, vertical and inclined directions. The position of AP is detected by conducting the template matching after the rotation correction of part of the input image. The version of the code is determined by calculation of the number of cells from the widths and positions of FP. Coordinate conversion expressions for converting the positions of DC into their coordinate positions based upon the positions of FP and AP and the version are determined and DC are cut out. The array of the cut out DC is decoded for reading the two-dimensional code.

The invention discloses a zero-force control method of a mechanical arm facing the direct demonstration. The zero-force control method of the mechanical arm facing the direct demonstration comprises the steps of S1, building an n-degree-of-freedom mechanical arm dynamic model with n flexible joints; S2, building a controller of the mechanical arm, wherein the controller is used for carrying out gravity compensation and reducing the influences of an inertia force and a friction force on the flexible joints; and S3, identifying a gravity term in the controller. According to the control method provided by the invention, not only can the gravity of the mechanical arm be compensated, but also the influences of inertia forces and friction forces of the joints can be reduced, and the method is simple, less in calculation amount, and convenient to implement.

A component includes a plurality of electrical connections on a process side opposed to a back side of the component. Each electrical connection includes an electrically conductive multi-layer connection post protruding from the process side. A printed structure includes a destination substrate and one or more components. The destination substrate has two or more electrical contacts and each connection post is in contact with, extends into, or extends through an electrical contact of the destination substrate to electrically connect the electrical contacts to the connection posts. The connection posts or electrical contacts are deformed. Two or more connection posts can be electrically connected to a common electrical contact.