108results about How to "Improve filtering efficiency" patented technology

An embodiment of the invention discloses a filtering method and a filtering device for point cloud data. The filtering method comprises the steps of: converting the point cloud data into raster data, and acquiring the lowest point in each raster as the initial point; performing morphological opening operation on the raster data to obtain an initial terrain surface; for each initial point, determining the current initial point as a potential ground seed point if a difference value between an elevation value of the current initial point and a value of the target raster which the current initial point falls into; constructing an initial triangulation network model according to the potential ground seed point; and determining a ground point according to the initial triangulation network model based on an irregular triangulation network filtering algorithm. By adopting the filtering method and the filtering device, the ground seed point can be reasonably determined, and the filtering efficiency is improved while guaranteeing the accuracy and precision of the initial triangulation network model, thereby the ground point in the point cloud data can be screened quickly and accurately.

A filter medium comprises a modified cross-section fiber (A) having a fiber diameter between 40 and 70 μm, an extremely fine fiber (B) having a fiber diameter of more than 5 μm and no more than 10 μm and a modified cross-section fiber (C) having a fiber diameter between 15 and 30 μm, the content of the extremely fine fiber (B) is between 3 and 10% by mass, and the content of the modified cross-section fiber (C) is between 5 and 15% by mass based on 100% by mass of total the fibers in the filter medium.

The invention provides a navigation radar co-frequency interference inhibition method based on spatial correlation. The method comprises the steps of: loading spatial sea area clutter continuous images, and synchronously recording an image sampling point number, a bus number, a direction number and a display mode; utilizing correlation among radar image signals in a spatial domain, carrying out correlation coefficient calculation on adjacent storage lines; carrying out classified statistics on correlation coefficient histograms of signal lines and noise lines, drawing corresponding probability density curves, utilizing a fixed threshold method to determine detection thresholds; and judging the noise lines and the signal lines through the detection thresholds; and utilizing a close line substitution method to restore the noise lines detected out. Aimed at the distribution characteristic that co-frequency interference on the radar images is represented as rayed noise in the radial direction, the sea clutter spatial correlation is utilized for noise detection, noise pre-processing is carried out on original radar images, the co-frequency interference is filtered out, and the sea wave parameter inversion precision is improved.

The invention belongs to wastewater treatment field, especially relates to printing and dyeing mill wastewater treatment. The invention employs sorting and collecting physico-chemical treatment, automatic- pressure filtering and separating wastewater and further chemical treatment for active sludge, to reduce the COD concentration in primary discharged water by 15%, and meet national standard. The invention is characterized by greatly saved energy and resource and benefit for environmental and resource protection and sustainable development.

The present invention relates to a coalescence filter for purifying a fluid which contains a carrier and at least one liquid contaminant, by coalescing of the at least one contaminant. The coalescence filter comprises an inlet for supplying the fluid to a filter element present in the coalescence filter. The filter element comprises a primary coalescence medium which is provided for coalescing of the at least one contaminant in the primary coalescence medium. The coalescence filter further comprises an outlet for discharging the coalesced contaminant from the filter element. The primary coalescence medium comprises at least one layer of a porous material, and has a total thickness of at least 3.5 mm, preferably at least 4 mm, preferably at least 5 mm, more preferably at least 6 mm, most preferably at least 7 mm, in particular at least 7.5 mm, measured at a pressure of 2N/cm².

The invention provides a target detection method based on two-dimensional sliding window robust space-time self-adaptive processing, which can increase the accuracy of target detection. The target detection method comprises the steps of : step 1, receiving echo data through an airborne radar; step 2, carrying out space-time sliding window processing on the echo data; step 3, establishing a target apparent steering vector error boundary matrix; step 4, calculating an autocorrelation matrix of projectional component of the echo data after space-time sliding window processing on an orthogonal complementary space of a subspace formed by the target; step 5, calculating a correlation matrix after diagonal loading of the autocorrelation matrix; step 6, solving a weight vector; step 7, judging whether a module value of a column vector obtained through multiplying a conjugate transpose matrix of the boundary matrix by the weight vector is less than 1, if so, increasing loading factors and then executing step 5 and step 6, otherwise, regarding the weight vector as the optimal weight vector; and step 8, constructing a filter by utilizing the optimal weight vector so as to filter the echo data after space-time sliding window processing, and acquiring target echo data.

The invention discloses a self-adaptive median filtering denoising method applied to image processing, which comprises the following steps of: firstly preprocessing an image, and then, (1) sorting data in a filtering window by adopting a divide-and-conquer sorting strategy; And (2) adaptively adjusting the size of a filtering window by combining the noise density. The adaptive median filtering denoising method applied to image processing is high in denoising efficiency and easy to implement.

A filter includes a filter element (1) having a filter medium (106) pleated in a zigzag manner, with a raw side (105) and a clean side (104). Filter medium sections (120), which extend on either side of the raw-side pleat tips (102a) to adjoining raw-side pleat bases (103a), include a first bend (552) toward the raw side (105), and behind that a second bend (554) toward the clean side (104), in each case viewed from the raw-side pleat tips (102a).

A water filtering device includes a filter element and telescopically interconnected inner and outer cylinder units. Each of the inner and outer cylinder units has an open inner end and a closed outer end. A first space is formed in the inner cylinder unit. The filter element is disposed within the inner cylinder unit, and is adjacent to the inner end of the inner cylinder unit so as to define a second space between the filter element and the outer cylinder unit. The outer cylinder unit is movable on the inner cylinder unit, such that the outer ends of the inner and outer cylinder units are moved toward each other, thereby forcing water to flow from the second space into the first space through the filter element.

The invention discloses a photon crystal filter with high resolution, comprises a photon crystal, and is characterized in that: the photon crystal filter also comprises an input waveguide formed on the photon crystal, a first output waveguide and a second output waveguide; the input waveguide, the first output waveguide and the second output waveguide are respectively provided with a sealed end. Two point defect cavities are provided between the first and the second output waveguides and the input waveguide, The peaks of photon crystals at the two ends of the first point defect cavity respectively moves outward for a first distance; and the peaks of photon crystals at the two ends of the second point defect cavity respectively moves outward for a second distance; the second distance is larger than the first distance. The invention enhances filtering efficiency, and can realize fine filtering, therefore, the invention is more suitable for optical integrating systems with high density.

The invention discloses a portable wristband device for monitoring physiological stress indexes, comprising a fingerprint identification sensor, a hear rate acquisition sensor, a blood pressure sensor, a noninvasive glucose detection device, a body temperature sensor and a wireless communication module; the fingerprint identification sensor, the heart rate acquisition sensor and the body temperature sensor are in communications connection with a first forwarding sensor, the blood pressure sensor and the noninvasive glucose detection device are in communications connection with a second forwarding module, the first forwarding module and the second forwarding module are in communications connection with the wireless communications module, and the first forwarding module and the second forwarding module are in communications connection through a monitor module. The defects of the prior art can be improved, and data transmission rate is guaranteed at the premise of ensuring data accuracy.

The embodiment of the invention provides a flexible winding and an inductor which are integrated with a capacitor characteristic, and a manufacturing method of the flexible winding. The flexible winding comprises a first metal layer, a medium thin film and a second metal layer having an instant self-restoring characteristic; the first metal layer and the second metal layer are arranged on both side surfaces of the medium thin film respectively so as to form a thin film capacitor structure of the flexible winding; and the first metal layer and the second metal layer are used as electrodes of the thin film capacitor structure respectively. The winding of the inductor is formed by coiling the flexible winding around a magnetic core. The manufacturing method of the flexible winding comprises the following steps of: installing the first metal layer on one side surface of the medium thin film, and evaporating the second metal layer having the instant self-restoring characteristic on the other side surface of the medium thin film; and pressing the structures together so as to obtain the flexible winding with the first metal layer, the medium thin film and the second metal layer.

Embodiment of the present invention discloses an interpolation filtering method and interpolation filter, which include setting N filter processing units, wherein the filter processing unit includes a filter data buffering unit, and the filter data buffering unit includes M data buffering sub-units; shifting and inputting source data points one by one to the filter data buffering unit of each filter processing unit in parallel and synchronously, processing filter operation to the source data points in each filter processing unit after the source data points are written to each data buffering sub-unit in each filter data buffering unit, and respectively outputting the operation result of the filter operation for each filter processing unit to an output data buffering unit; shifting and inputting next source data points to the filter data buffering unit of each filter processing unit until processing X times filter operation to each filter processing unit, obtaining X operation results and outputting the operation results, wherein X is the number of the source data points.

The invention relates to the technical field of light emitting diode (LED) lighting, in particular to a ripple filter circuit of a high-efficiency LED constant current source. According to principles of low sampling voltage of a bipolar junction transistor (BJT) and controllable and variable internal resistance of the BJT, current is detected by a resistor R2 and an inductor L1, and a detection result is accurately adjusted by a triode amplification unit, so low-frequency ripple and switching pulse ripple in the circuit are filtered, electric energy on an electrolytic capacitor constantly flows to an LED load, and the current which is obtained by the LED load can be pure constant current which is substantially free from the ripple. The ripple filter circuit of the high-efficiency LED constant current source has the advantages that the content of the low-frequency ripple is not more than 1 percent, and the filter efficiency can be between 97 percent and 99 percent. The ripple filter circuit is simple in structure, small in quantity of circuit elements, small in size, low in cost and high in circuit reliability and working efficiency, the insertion loss of the circuit is only 1 to 3 percent, and the cost performance of a product is greatly improved.

The invention relates to the technical field of motor controllers and in particular relates to a motor controller. The motor controller comprises a controller shell, wherein a thin-film capacitor component, an IGBT (Insulated Gate Bipolar Translator) component and a direct-current busbar are arranged in the controller shell; a cooling bottom plate is arranged at the bottom of the controller shell;a capacitor cooling chamber, an IGBT cooling chamber and a busbar cooling chamber are formed in the cooling bottom plate; the capacitor cooling chamber and the busbar cooling chamber respectively correspond to the positions of the thin-film capacitor component and the direct-current busbar isolated above the cooling chambers one by one; the bottom of the IGBT component is correspondingly insertedinto the IGBT component cooling chamber. According to the motor controller disclosed by the invention, the controller shell is designed and produced by adopting a high-pressure aluminum alloy castingprocess, and the motor controller is light in weight, compact in structure and high in power density; the bottom of the shell adopts a full water cooling design, the heat exchange area is enlarged, and the heat exchange efficiency is improved; a universal water pipe joint with an adjustable position is arranged on the controller shell, so that the cost of development is reduced, and the adaptability of the product is improved.

The invention provides a suspended structure subwavelength guided mode resonant terahertz high efficiency narrowband filtering method, which is a new filtering method. At the same time, a device prepared by the method and a preparation method are provided, the filtering efficiency does not decrease as the wavelength becomes longer, and the filtering bandwidth does not broaden as the wavelength becomes longer, thereby enabling efficient and narrowband filtering. The filter of the invention adopts a high-resistance silicon resonant structure suspension technology, which improves the filtering efficiency and the quality factor of the guided mode resonance, reduces the loss of the resonant structure, and reduces the bandwidth; and the two-dimensional array structure is adopted to overcome thedevice asymmetry problem.