42 results about "Shadow zone" patented technology

The invention discloses a zero momentum magnetic control sun capture device and method of a satellite. The device comprises a 0-1 type sun sensor, a magnetometer and a magnetic torquer, wherein the 0-1 type sun sensor and the magnetometer are matched, and are used for performing satellite attitude measurement; the output of the magnetic torquer acts on the satellite body after delay, and is used for providing control moment for the satellite in the satellite rate damping process and controlling the attitude angle deviation to be less than a preset threshold value, so as to realize zero momentum magnetic control sun capture; when the 0-1 type sun sensor judges that the sun appears in the field of view, the double-vector attitude determination FORM algorithm is adopted, and a three-axis attitude matrix of the satellite is determined through the 0-1 type sun sensor and the magnetometer; when the 0-1 type sun sensor judges that the satellite enters the shadow zone, the satellite elevation angle is determined through the magnetometer. According to the zero momentum magnetic control sun capture device and method, the single machine configuration of the control system is simplified, the reliability of an attitude control subsystem is improved, and the resources on the satellite are saved.

A motor vehicle headlamp has a discharge lamp, a reflector and a smooth or nearly smooth cover lens, the reflector being adapted to generate a beam below a cut-off line. At least two masks are associated with the discharge lamp, and define two shadow zones on the reflector; the reflector includes at least two reflective zones for forming portions of the beam below the cut-off line, with different amounts of sideways spreading of the light; and these zones of the reflector are separated by generally radial transition planes, at least some of which extend into the shadow zones. A particular application is to enable wide cruising beams to be produced to European standards without any optical anomalies.

The invention relates to a method for illuminating/normalizing an image and a method for identifying an image by using the same, wherein the method for illuminating/normalizing the image comprises the steps of: dividing the input image into a shadow zone and a normal illumination zone; obtaining the small scale part of the image when lambda L1 is valued within 0 to 0.5 according to a TVQI model or LTV model, preferably lambda L1=0.2; obtaining the small scale part of the image when the lambda L1 is valued within 0.6 to 1, preferably lambda L1=0.8; taking the small scale part of the image obtained when the lambda L1 is valued within 0 to 0.5 (preferably 0.2) as the small scale part of the shadow zone of the image, then taking the small scale part of the image obtained when lambda L1 is valued within 0.6 to 1 (preferably 0.8) as the small scale part of the normal illumination zone of the image, and splicing to obtain the small scale part v of the whole image. The invention can enhance the effectiveness of image identification under a complicated illumination condition without knowing the light source information previously.

The invention relates to a radar target and shadow segmentation method based on wavelets and constant false alarm rates. The method includes the following eleven steps: inputting a synthetic aperture radar image; selecting a wavelet function; conducting wavelet multi-dimensioned decomposition; selecting a high frequency sub-image after wavelet decomposition; inputting a CFAR detector I; segmenting the selected sub-image; performing wavelet inverse transformation; removing a mean value; inputting a CFAR detector II; inputting a target that finally needs to be segmented; and segmenting the image again. The advantages of the method are that the influence of spot noise on an SAR image is reduced; the defect that a contrast ratio between a target and a background has to be high in terms of a single CFAR detection method is overcome, and a target zone and a shadow zone can be detected at the same time; weak scattering targets in the SAR image can be effectively segmented, and the method exhibits high universality. An experiment shows that the mentioned SAR image segmentation method based on CFARs and wavelet transformation is a feasible and effective segmentation method, and has great application prospects.

The subject of the invention is a secure method for automatically closing a motor vehicle tailgate (200) fitted with at least one presence sensor (201; 202; 203; 204) of an element in a detection zone (206), the said detection zone having at least one shadow zone (207; 208; 209; 210), characterized in that it comprises the step consisting in making the automatic operation of closing the vehicle tailgate conditional upon the completion of the following various operations: —detecting (301) the presence of an element in the detection zone; —detecting (304) a departure of the said element from the detection zone.

An exemplary embodiment of the present invention may include a cavitating body sonar system and method. The method may include, in an exemplary embodiment: applying a receiving-while-transmitting sonar signal processing to at least one cavitating body, over an entire range of achievable sonar operating frequencies; applying transmit wave-form shaping to a RWT sonar system employed on the cavitating body; applying heterodyne filter frequency rejection to the RWT sonar system employed on the cavitating body; applying detection processing techniques to the RWT sonar system employed on the cavitating body; employing at least one transducer as an acoustical transmitter near a scattering body comprising the cavitating body, wherein the at least one transducer is strategically located with respect to said cavitating body, at least one target, and a receiver, wherein the receiver lies in a shadow zone of the body, but the at least one target does not; and, employing at least one transducer as an acoustical transmitter near a scattering body comprising the cavitating body, wherein the at least one transducer is strategically located with respect to a cavity, at least one target, and a receiver, wherein direct propagation of a transmitted signal along the outside of the cavity to the receiver is inhibited, and reflected propagation from the acoustical transmitter to the target and thence reflected to the receiver is not inhibited.

Heat irradiation apparatus (1) defined in terms of the following:—Refractory flexible irradiation module (7) comprising stopping means which are high temperature resistant and avoid shadow zones and side losses of heat at the burning zone in the ceramic surface;—Employment of refractory flexible ceramic plates (15) having flexible pores which permit air/gas modulation, the flexible pores permit define the path of the air/gas mixture through the ceramic plate (15). When the flow pressure of mixture is reduced, part of the pore automatically close and the combustible mixture is conducted to the surface where the hot fibers are placed. The fibres keep the combustion active at the surface, multiplying IR heating effects. Ceramic plates (15) of the art tend to “swallow” the flame causing an inner burning and reducing the efficiency of the process and/or loss of the control of the flame and equipment explosion.—Sensors and measuring means are provided for monitoring all steps: Thermal sensor (14)—safety device applied in the lower face of each flexible fibrous ceramic module (15), more particularly fixed in the support screen of the ceramic plate (15) and extending to median line of such plate (15), for monitoring a possible heat flow inversion due to external factors which cause the “flame swallowing”. The apparatus further comprises oxygen measuring means (23) and an ultraviolet flame detector (24).

The invention discloses a method of removing foreground detection result shadows, comprising: obtaining a grey-scale map and a foreground detection map from an input original map to obtain the shadow candidate zone in the grey-scale map; removing the background of the grey-scale map to obtain a foreground grey-scale map; calculating the texture statistical characteristic number of each pixel row in a horizontal direction according to the foreground grey-scale map, and calculating the texture statistical characteristic number of each pixel column in a vertical direction; finding a segmentation position by utilizing the texture statistical characteristic numbers; and respectively calculating the ratio between each shadow candidate zone on two sides of the segmentation position in the grey-scale map and a foreground pixel, and selecting the side with a greater ratio out of two sides on the segmentation position as a shadow to remove. The invention also discloses a corresponding apparatus. The method and apparatus can effectively reduce the shadow false drop rate in a foreground detection result, avoid the error checking of a non shadow zone as a shadow zone, increase shadow identification accuracy, and thereby facilitate the improvement of subsequent processing efficiency.

A radar object detection system includes a first sensor and a controller. The first sensor emits a first radar signal toward a first area about a vehicle, and outputs a first signal indicative of detected targets proximate to the vehicle. The controller receives the first signal from the first sensor, determines when a trailer is connected to the vehicle based on the first signal, defines a shadow-zone that corresponds to a first portion of the first area obstructed by the trailer from being viewed by the first sensor, and ignores detected targets within the shadow-zone that are indicated by the first signal.

The invention discloses a displacement measuring device with a reference and a measuring method. The device comprises a point light source for setting a measured point, a composite lens, a positioning frame with front and rear light-through seams, and a CCD or PSD photoelectric device. Wide-field parallel light which is generated by the point light source through the composite lens sequentially passes through the front and rear light-through seams. When a measured marker exists in a light path, one part of light can be shielded by the measured marker and a shadow zone is formed on a CCD or PSD target surface; the changing of the position of the center of the shadow zone relatively to the edge of the rear light-through seam of the positioning frame is measured to obtain the changing of the position of a measured object. The method is applicable to deformation measurement for base points of various dams, bridges, high-rise buildings and high slopes. The invention has the advantages of simple structure, high cost performance, non-contact measurement, high measuring precision and real-time monitoring.

The invention provides a geosynchronous orbit satellite solar cell array closed-loop counterglow tracking method. The geosynchronous orbit satellite solar cell array closed-loop counterglow tracking method comprises the following steps: S1, a solar tracking angle is calculated, specifically, the solar tracking angle is calculated according to a current signal output by an analog solar sensor; S2,the solar tracking angle is subjected to filtering processing; S3, solar array coarse counterglow is conducted; S4, solar array closed-loop fine counterglow is conducted; and S5, shadow period judgment and control are conducted, specifically, whether a geosynchronous orbit satellite is in the shadow period or not is judged, and if the geosynchronous orbit satellite is in the shadow period, a solararray is transferred into a shadow zone control mode. According to the geosynchronous orbit satellite solar cell array closed-loop counterglow tracking control method, an autonomous feedback closed-loop control system on the satellite is formed by taking the analog solar sensor mounted on the solar array as a sensor, taking a solar array driving mechanism as an executing mechanism and taking a control computer as a controller, the solar array accurately points to the sun in real time, and the geosynchronous orbit satellite solar cell array closed-loop counterglow tracking method can be applied to the research and development processes of geosynchronous orbit satellite platforms in China.

The invention provides a method for optimum thrust distribution of position keeping of a conical layout electric propulsion satellite in a fault mode. According to the method, an analytical method isadopted for conducting position keeping control distribution of electric thrusters in a conical layout fault mode; firstly, a pair of thrusters which have no faults and are used for position keeping control are selected according to a thruster with faults; secondly, two different distribution modes of the thruster pair are obtained and selected; finally, the startup time of the electric thrustersis changed to avoid a shadow zone. According to the method, the completely analytical mode is adopted, and the distribution purpose of the electric propulsion position keeping thrusters in the fault mode is achieved, so that the fuel consumption is optimized, the startup frequency of the thrusters within an orbital period is reduced at the same time, and therefore the effective thruster distribution method is provided for electric propulsion position keeping of the geostationary orbit satellite in the fault mode.

The invention discloses a target characteristic extraction method, identification method, extraction device and identification system for a synthetic aperture sonar image. The target characteristic extraction method includes the steps of extracting shadow geometrical characteristics which include the target shadow zone area, the perimeter zone contour length, the eccentricity ratio, shape parameters, direction values and the ratio of the largest width of a target to the largest width of a shadow, obtaining a characteristic space formed by the shadow geometrical characteristics, extracting the target normalization central moment, obtaining a characteristic space formed by the target normalization central moment, extracting statistical property parameter difference characteristics of a background, the target and the shadow, obtaining shape parameters and dimension parameters, then obtaining a characteristic space formed based on the statistical property parameter difference characteristics of the background, the target and the shadow, and forming a new characteristic space formed by the three characteristic spaces. According to the target characteristic extraction method and identification method for the synthetic aperture sonar image, an underwater object can be effectively represented, and detection and identification of the synthetic aperture sonar image are facilitated.

This invention discloses a shadow rendering methods, including: a shift of the light source, offset by the first light source and the second shift points to the first and second shift migration point for point light source location, access scenes of the first and second shadow depth map shadows depth map; drawing points of the first points to the distance between the first shift values from the first shadow depth map, the access point corresponding to the first mapping the depth value; if judged by the depth of greater than or equal to the drawing points of the first migration from the point value, the calculation of the first drawing point to the second migration from the point of value, otherwise referred to drawing point for the first mapping of color from the second shadow depth map, the access point corresponding mapping the depth values; if judged by the depth value is less than the first drawing point to the second shift at the distance, then the drawing for the second point above drawing color value. The present invention also discloses a shadow rendering device to achieve a virtual reality scene illumination, rendering shadow zone.

The invention provides an airborne interference synthetic aperture radar (SAR) shadow estimate and plane route design method for resolving the problems of an airborne SAR low signal-to-noise ratio zone shadow estimate basis and a plane route design basis. The airborne interference SAR shadow estimate and plane route design method comprises the steps: step1, providing an initial plane route which can cover a measuring zone, and calculating a gradient angle, a radar part view angle, and a shadow length of each grid unit; step2, utilizing a backscattering coefficient model to calculate ground backscattering strength inside each grid unit under each ground covering condition; step3, calculating the low signal-to-noise ratio zone shadow estimate basis, distinguishing and marking whether the unit is low signal-to-noise ratio or not, and counting the proportion of the area in which the low signal-to-noise ratio shadow zone occupies the measuring zone; step4; judging and marking a geometry shadow and the low signal-to-noise ratio zone shadow in the plane route direction, and counting a proportion of the area in which the two shadows occupy the measuring zone; step 5, changing the initial plane route which is set in the step 1, repeating step1-step4, and selecting a plane route which is smallest in shadow proportion after the shadows are combined.

A two-dimensionally multicolor scene shadow area division method. It is dividing the shadow area according to the obvious colorific value H in the shadow area and the difference between the three luminous intensity namely red R, green G and blue B in the shadow area and the unshaded area. The invention can improve the character of agility and convenient for the multicolor data image analysis and aim.

According to an embodiment of the present invention, a reradiation repeater may comprise a dielectric substrate, a ground conductor provided on a surface of the dielectric substrate, and a plurality of unit cells provided on another surface of the dielectric substrate, wherein the unit cells reradiate radio waves in the same direction by directing the radio waves which are incident onto the unit cells at different angles to a same direction. The reradiation repeater may facilitate to select, e.g., an installation location and secure a good reradiation capability even when the installation environment is changed (e.g., a variation in the installation location of base station facility), contributing to coverage of a shadow zone. The reradiation repeater may be implemented in various manners according to embodiments of the present invention.

A method of using ultrasound to inspect a part in immersion, by means of a focused beam of ultrasound waves oriented perpendicularly to the surface of the part, the method consisting, when the axis of the focused beam is close to an edge of the part, in tilting the axis towards said edge relative to the normal to the surface of the part in order to eliminate the lateral shadow zone over all or substantially all of the depth of the part.

The present invention provides an image terrain radiation correction method and a device. The method comprises the following steps: reading a solar zenith angle and a solar azimuth angle of an image to be corrected; calculating and obtaining slope, aspect and a reference shadowing factor by using a digital elevation model; calculating and obtaining a sky observation factor according to the slope,and calculating and obtaining a solar effective incidence angle according to the solar zenith angle, the slope, the aspect and the solar azimuth angle; extracting a shadow zone of the image to be corrected, correcting the shadow zone by using the reference shadowing factor, and determining a shadowing factor; calculating and obtaining an atmospheric correlated radiation amount by using a radiationtransmission model; and according to the solar zenith angle, the sky observation factor, the solar effective incidence angle, the shadowing factor and the atmospheric correlated radiation amount, calculating and obtaining reflectivity rates of all image elements of the image to be corrected by using a preset reflectivity rate calculation formula or a relative reflectivity rate calculation formula. The method can be used for performing terrain radiation correction on the image, and thus the terrain radiation correction on the image is realized.

The invention provides a lunar orbit light condition analytical method which comprises the steps that an epoch moment is set, and a sun position and a lunar orbit element are computed; according to the lunar orbit element, a first transferring matrix from a geocenter equator inertial system to a selenocenter equator inertial system is computed; according to the first transferring matrix, a second transferring matrix from the selenocenter equator inertial system to an observing coordinate system is computed; a first true anomaly is recorded and is used as an orbit simulation initial point for computing time of different lunar orbits at a shadow zone; and the first true anomaly is used for carrying out orbit simulation, an eclipse factor and a lighting factor are computed, and accordingly light conditions on different lunar orbits are analyzed. Therefore, according to the lunar orbit light condition analytical method, computing is easy and flexible, the computing results are accurate, the inner relation between the lunar orbit light conditions and lunar orbit parameters can be analyzed conveniently, scene setting is easy, and workload is greatly lowered.

The invention discloses a lighting module of dancing floor, comprising a casing, an illuminant arranged in the casing and a panel sealing-covering the illuminant erected on the casing, which is characterized in that a clapboard dividing the casing into upper and lower two cavities is arranged in the casing, support pillars supporting the panel are evenly distributed on the upper surface of the clapboard, the support pillar is made of transparent materials. The invention has the advantages that because the support pillar is made of transparent materials, the ray of the illuminant can pass through the contact zone of the support pillar and the panel, and cannot leave a shadow zone on the surface of the panel, and the picture quality on the surface of the panel can be improved; simultaneously the invention can omit the light diffusing layer of the panel, simplify the production structure, and reduce the production cost, and the reliability of the product is good.

A method for detecting whether a current layer of a chip is aligned with a front layer of the chip or not, belonging to a semiconductor process manufacturing field, comprises marking a wafer surface to be detected, exposing markers of the current layer and the contrast layer of a micro-shadow zone of the wafer to be detected; measuring the markers of the current layer and the contrast layer by an overlapping measuring apparatus and performing analog computation by an analysis software of the overlapping measuring apparatus, judging whether deformation is existed by a measured result. The invention solves the problem that the chip is deformed, improves performance of the chip and production efficiency of the factory, saves manpower and material resources.