68results about How to "Expand the capture range" patented technology

An imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with negative refractive power has a convex object-side surface and a concave image-side surface. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element with refractive power has an object-side surface and an image-side surface being aspheric. The fifth lens element with positive refractive power has an object-side surface and an image-side surface being aspheric. The sixth lens element with negative refractive power has a concave image-side surface, wherein at least one reflection point is formed on the image-side surface thereof.

A filter circuit arrangement for filtering of a radio-frequency signal has a first tunable filter and a phase regulation loop in order to hold the first tunable filter to a transmission phase constant relative to the frequency of the radio-frequency signal. The filter circuit arrangement has a second tunable filter arranged parallel to the first tunable filter in the phase regulation loop. The first tunable filter and the second tunable filter exhibit different attenuation characteristics and are fashioned and connected within the phase regulation loop so that: a capture range of the filter circuit arrangement, in which a tuning of the phase regulation loop to a radio-frequency signal to be filtered is possible is dominated by the attenuation characteristic of the second tunable filter, and so that the transmission behavior of the filter circuit arrangement in operation is dominated by the attenuation characteristic of the first tunable filter, given a tuned phase regulation loop. A circuit arrangement for generation of a local oscillator signal has an oscillation generator and a filter circuit arrangement as described above arranged downstream of the oscillation generator.

The invention relates to an operation instrument for optical tweezers. The operation instrument comprises a laser source, a convex lens, a plane mirror, a two-tone spectroscope, optical wedges, a focusing objective lens, a sample table, a sample pool, an illuminating light source and a CCD camera. Light beams are emitted by the laser source, expanded and shaped by a light beam coupler, and then are converged and irradiated by the plane first mirror, the two-tone spectroscope, the two deflection optical wedges and the focusing objective lens into the sample pool to capture target particles, the first optical wedge and the second optical wedge are driven by a motor to deflect around the Y axis and the X axis respectively in an orthogonal mode, the deflection angle can be measured through an angle sensor, the deflection of the light beams is controlled, and the target particles are moved; the particle capturing and moving process can be visually acquired through the CCD camera and a displayer. When the particles move in the plane parallel to the XOY plane, the sample pool does not need to move, namely, the particles are not affected by external vibration in the moving process; in addition, due to the fact that the two orthogonal deflection optical wedges can achieve the light beam deflection hundredfold-order reduction ratio, the deflection directions of the light beams can be accurately controlled, and the light beams can capture the particles accurately and carry the particles to move firmly.

The invention discloses a method for extracting video object contour based on centroid tracking and improved GVF Snake. The method is characterized by comprising the following steps of according to the condition that the movement trend of adjacent frames is similar in short time, dividing a video sequence into a plurality of sections, wherein each section has k frames of video, taking the first two frames in the section as key frames, detecting the effect of eliminating the background border based on the change of t obvious test, and acquiring an initial movement area; extracting a critical quadrangle as an initial contour of the key frames, performing intra-frame GVF Snake evolution, searching the exact contour, then forecasting initial contours of the subsequent frames through the movement vector between centroids of the intra-frame movement object contours of the key frames, and then performing the exact intra-frame GVF Snake contour positioning of the subsequent frames; and by the analogy, extracting the object contour of all frames. The improved model adopts four-direction anisotropic diffusion, and adopts fidelity term coefficients with fast descending speed to enhance the performance to enter into concave; and the convergence to a weak edge is kept. By the method, the shortcoming of manually acquiring the initial contours is conquered.

The invention discloses a high-precision frequency and phase discrimination signal processing method and device in laser offset frequency locking. The method comprises the steps: enabling tunable laser and a femtosecond optical frequency comb to pass through a beat frequency signal detection unit to obtain a beat frequency signal, performing analog-digital sampling on the beat frequency signal andthen enabling the signal to enter an FPGA development board for frequency and phase discrimination processing; multiplying the beat frequency signal by a reference signal and carrying out low-pass filtering; acquiring a corresponding phase through a coordinate rotation arithmetic unit; performing scaling processing on a phase after phase unwrapping, outputting an error voltage signal to an analogPID controller through a digital-to-analog converter, enabling the analog PID controller to generate a control signal to the tunable laser for closed-loop control, locking the frequency of a beat frequency signal to a reference signal, and calculating the signal-to-noise ratio, the frequency and the amplitude of the beat frequency signal. The invention solves the problems of difficulty in improving the frequency and phase discrimination precision of the beat frequency signal and small capture range in the offset frequency locking technology of locking the laser to the optical frequency comb,and can be widely applied to the field of laser precision measurement.

The invention provides a method for capturing water armies on microblog platforms. The method includes the following steps: step one, by forwarding lists of new microblog hot topics or celebrity microblogs, and with the help of artificial judging, acquiring an initial water army sample S; step two, acquiring fan lists L of all the sampled water armies, and according to preset threshold values, filtering and obtaining user lists L' in close relations with a plurality of water armies in the sample; step three, acquiring the feature information of microblog publishing of the users; step four, judging the users whether to have the characteristics of the water armies or not one by one with the information acquired in the step three; and step five, adding the newly obtained water armies to the sample and then selecting an iterative process repeating the step two to the step four.

The invention relates to a method for segmenting a cardiac nuclear magnetic resonance image. The method for segmenting the cardiac nuclear magnetic resonance image comprises the following steps of: 1, performing Gaussian filtering preprocessing on the acquired cardiac nuclear magnetic resonance image; 2, computing an external force field of a generalized gradient vector flow based on expansion neighborhood and noise smoothing on the preprocessed image; 3, defining an initialized outline position of the left ventricular endocardium of the heart; 4, segmenting the left ventricular endocardium of the heart; 5, defining a final segmenting outline result of the left ventricular endocardium of the heart into an initialized outline position of the left ventricular epicardium of the heart; 6, setting the boundary strength of an area surrounded by the endocardium outline in an original boundary graph to be 0, recomputing the external force field of the generalized gradient vector flow based onthe expansion neighborhood and the noise smoothing; and 7, segmenting the left ventricular epicardium of the heart. Based on convolution computation, and by taking energy constraint of an elliptical shape, the method for segmenting the cardiac nuclear magnetic resonance image has the advantages of high computing speed, wide capturing range, strong anti-noise ability, excellent performance in weakboundary protection and deep dented region segmentation, and capability of accurately segmenting the left ventricular endocardium and the left ventricular epicardium of the heart.

A PLL clock generator generates an output signal with a frequency N times (where N>=1) as high as that of an input signal. The clock generator includes: a frequency divider for dividing the frequency of a clock signal by N so as to output a frequency-divided clock signal; a phase comparator for detecting a phase difference between the input signal and the output signal of the frequency divider so as to output a phase difference signal including information representing the phase difference; a LPF for smoothing the phase difference signal; a VCO for generating the clock signal, of which the frequency is determined by the output of the LPF, and outputting the clock signal to the frequency divider; and a phase shifter for shifting the phase of the output signal of the frequency divider in accordance with the phase difference signal.

The present invention improves a lead-in time of the PLL with a phase error detector having an enlarged range of phase error detection and gain control based on the PLL synchronous state. The phase error detection range is enlarged by correcting the phase error detection point in a case where the phase error increases. A locked state of the PLL is determined based on a standard deviation of the smoothed phase error values and the gains are switched between a lead-in transient state and a stationary state. As a result, it is possible to shorten and stabilize the lead-in time of the PLL.

The invention relates to the technical field of safety, and provides a method for obtaining pictures via remote control. The method for obtaining the pictures via remote control includes steps: receiving a picture obtaining instruction including geographic information; searching a plurality of mobile terminal communication interfaces matched with the geographic information; broadcasting a snapshot instruction to the mobile terminal communication interfaces; and receiving a snapshot picture in response to the snapshot instruction. Correspondingly, the invention also provides a server employing the method. According to the method and the server, a movable mobile terminal is employed as camera equipment, the mobile terminal is controlled to obtain a target picture in a remote manner, illegal behaviors can be monitored in an omnibearing manner, illegal destruction is prevented, the construction cost of a monitoring system is reduced, the reliability is high, and the maintenance is facilitated.

The present invention is a system and method for use with alignment marks and search algorithms of diffraction pattern detection tools. The system and method of the invention significantly increases the capture range of diffraction pattern detection methods and enable more efficient operation of tools employing such detection methods.

In a phase error detecting circuit used in a synchronous clock extracting circuit for extracting a clock which is synchronized with reproduced data, a cross reference value generator 72 inputs, as a rising cross reference value S5, rising phase error data S3 calculated in a phase error calculator 71 to a rising cross detector 70a and inputs, as a falling cross reference value S6, falling phase error data S4 similarly calculated to a falling cross detector 70b. Each of the cross detectors 70a and 70b calculates a difference value between the value of the reproduced data at a sampling point and the inputted cross reference value (cross offset value) S5 or S6 and outputs a rising or falling cross detection signal when one of two difference values at consecutive sampling points is negative and the other thereof is positive. Accordingly, a capture range is enlarged.

In a phase sync circuit (40) which extracts a clock signal CK from a data signal D in a random NRZ format, particularly in a phase sync circuit (40) of a dual loop configuration including both a phase comparison circuit (81) and a frequency comparison circuit (10), a phase sync circuit (40) capable of achieving both broadening of the capture range and extraction of a high-quality clock signal without requiring any reference clock signal is provided. A clock signal Ca, another clock signal Cb having a phase delayed by an approximately ¼ period from the clock signal Ca and the data signal D are input to the frequency comparison circuit (10) to output a logical value according to the high-low relationship between the frequency of the clock signal and the bit rate of the data signal D. This logical value is fed back by a frequency comparison loop F2 to bring the frequency of the clock signal CK close to the bit rate of the data signal D without requiring any reference clock signal, thus achieving both broadening of the capture range and extraction of a high-quality clock signal.

A solid-state image capturing apparatus according to the present invention includes a pixel area in which pixels for generating a signal charge by a photoelectric conversion on an incident light are arranged in a two dimensional matrix; a row selection section for selecting each pixel row of the pixel area; a plurality of column signal lines, to which an analog pixel signal from each pixel of a pixel row selected by the row selection section is readout; and a signal processing circuit for generating a digital pixel value from the analog pixel signal of each pixel that is read out to each of the column signal lines, where the signal processing circuit includes at least two or more AD conversion circuits for simultaneously converting the analog pixel signal of each pixel of the selected pixel row into a digital pixel value.

The invention relates to a cardiac nuclear magnetic resonance image segmentation method which comprises the following steps of: 1, carrying out Gaussian filtering pretreatment on an image; 2, calculating an external force field of an edge for keeping a normal gradient vector flow; 3, defining an initialization outline position of an inner membrane of the cardiac ventriculus sinister; 4, adding a circular energy constraint in a curve evolution process, and segmenting to obtain the inner membrane; 5, defining a final segmentation outline result of the inner membrane as an initialization outlineposition of an outer membrane; 6, setting the edge strength of a zone enclosed by the inner membrane outline in an original edge graph as 0, and re-calculating the external force field; and 7, addinga circular energy constraint in a curve evolution process, and segmenting to obtain the outer membrane. The invention has the advantages of large capturing range, strong noise proof capacity, better robustness to weak edge leakage, and capability of accurately segmenting the inner membrane and the outer membrane of the ventriculus sinister wall.

The invention provides a multiple-variable-propeller wind driven electric generator. The multiple-variable-propeller wind driven electric generator comprises variable propeller devices used for capturing and converting gravitational potential energy of wind energy / rain water into own rotational potential energy and further used for capturing and using solar energy, a power source used for providing driving power for deformation of the variable propeller devices, an anemoscope used for detecting the power generation environment natural wind flowing direction and delivering wind direction signals to a controller, a power generation cabin used for accepting the rotational potential energy of the variable propeller devices and converting the rotational potential energy into electric energy anda tower rack used for erecting and supporting the power generation cabin, wherein the variable propeller devices are arranged at the front end of the power generation cabin, the anemoscope is arranged at the rear end of the power generation cabin, the tower rack is arranged between the power generation cabin and the ground and the power generation cabin is rotatably arranged at the top of the tower rack, the tower rack is internally provided with a yawing device for driving the power generation cabin to rotate around the vertical direction, and signal connection is established between the yawing device and the controller.

A microscope for high-resolution imaging of a sample in a depth direction and transversely thereto has an excitation beam path for illuminating a sample,—an imaging beam path with an objective and two detectors,—and a phase element. The phase element is situated in a pupil of the imaging beam path and has a different influence on two halves of the pupil cross section. The imaging beam path is split into two partial imaging beam paths downstream of the pupil as seen in the imaging direction, which partial imaging beam paths each lead to one of the two detectors. The two partial imaging beam paths have imaging lengths that differ by a specific wavelength difference such that the two detectors record images of the sample from two different focal planes, which are spaced apart by a distance in the depth direction.

The invention provides a multi-pitch-varying power generating method of a wind driven generator. The method includes the steps that in a wind blowing environment, a controller transmits wind directionsignals of an anemoscope to a yaw device, the yaw device drives a power generating bin to rotate, a pitch varying device conforms to wind directions, the pitch varying device captures wind energy andconverts the wind energy into rotation potential energy of itself, and the pitch varying device drives the power generating bin to operate to generate power; in a rainfall breezeless environment, thepitch varying device is automatically transformed into a V structure with an upward opening and captures the gravitational potential energy of rainwater, the gravitational potential energy of the rainwater is converted into the rotation potential energy of the pitch varying device, and the pitch varying device drives the power generating bin to operate to generate power; in a sunny breezeless environment, the pitch varying device is automatically transformed and folded, solar energy is captured, and power is directly generated; and in a hurricane environment, the pitch varying device is automatically transformed to be parallel to the wind directions, impact force of hurricane to the pitch varying device is reduced, and the pitch varying device is in a self-protection state.

The invention discloses a stern rope ring unfolding, hanging and dragging traction device which can quickly establish connection between a mother ship and a recovery target so as to pull a recovery target and assist in laying the target. The device comprises a traction rope, left and right traction rods, a rope guide device, a releaser and a winch. The traction rope is released by the winch, thenpenetrates through the rope guide device, is positioned at the tail end of the left traction rod, then is wound to the tail end of the right traction rod and finally is fixed to the releaser after passing through the rope guide device, and therefore a U-shaped rope loop is formed on the water surface of the stern. During use, a recovered object carries a hook to enter the rope ring, the hook is used for hooking the rope ring, and the rope ring is separated from the tail ends of the left traction rod and the right traction rod under the traction action of the recovery target and is closed underthe limitation of the rope guide device, so that dragging of the recovery target is realized. When a target is placed, the closed rope loop is hung on the hook of the target, and the target is tensioned to stably enter water. After the target enters the water, the releaser releases the traction cable, and the traction cable is pulled back to be separated from the hook on the target to finish laying.

The invention relates to an auxiliary phase discrimination circuit of a PN code loop. The auxiliary phase discrimination circuit of the PN code loop can expand the range of phase discrimination of the PN code loop and the range of capture of phase positions of the PN code loop, and can improve the tolerance capacity of the PN code loop to initial phase position errors. According to the technical scheme, a PN code loop phase discrimination circuit and an extended PN code loop phase discrimination circuit are used, wherein the PN code loop phase discrimination circuit is formed by two paths, and each path is formed in the mode that a correlator circuit, an accumulated point zeroing filter circuit and an absolute-value evaluation circuit are connected in series in sequence, and the common end of the two paths is connected with a subtracter; the extended PN code loop phase discrimination circuit is formed by two paths, and each path is formed in the mode that a correlator circuit, an accumulated point zeroing filter circuit and an absolute-value evaluation circuit are connected in series in sequence, and the common end of the two paths is connected with a subtracter; the correlator circuits of the PN code loop phase discrimination circuit and the correlator circuits of the extended PN code loop phase discrimination circuit are respectively connected with code sequence output of a PN code generator, and the subtracter of the PN code loop phase discrimination circuit and the subtracter of the extended PN code loop phase discrimination circuit are together connected with an added circuit used for solving error voltage. Error voltage output is obtained by the PN code loop phase discrimination circuit and the extended PN code loop phase discrimination circuit through the added circuit. Compared with the prior art, the capture range of the auxiliary phase discrimination circuit of the PN code loop is three times that of an initial phase position, and a related secondary peak, located within the range from a positive half chip to a negative half chip, of an existing phase discrimination circuit can be eliminated.

The present invention discloses a method and image pick-up system for obtaining clear images through the rain, snow or fog. The method includes a DSP processing module controls a laser pulse generating module output laser pulse signals with a default pulse width, and shut the laser pulse generating module down when a first default time arrives; when the laser pulse signals is being output, the DSP processing module controls an electronic shutter of an image pick-up device open after delaying for a second default time, and close the electronic shutter when a third default time arrives; wherein, the third default time is a lasting period of the default pulse width of the laser pulse signals; then, an FPGA module processes the images captured by the image pick-up device, and outputs clearer images, or makes the capturing distance farther but obtains clear images.

The invention relates to a visual and steering-controllable abscess debridement device. The visual and steering-controllable abscess debridement device comprises a handle and a pipeline body; a first adjusting button and a second adjusting button are arranged on the side edge of the handle, a display screen and a switch button are arranged on the surface of the handle, and a power module is arranged in the handle; the pipeline body is of a hollow structure, and the tail end of the pipeline body is of a Y-shaped structure and is connected with the handle; the top end of the pipeline body is communicated with a first bent pipe and a second bent pipe, and an illumination camera system is arranged on the periphery of the inner side of the top of the first bent pipe; the first adjusting button and the second adjusting button are connected with the two sides of the top end of the first bent pipe and the two sides of the top end of the second bent pipe through steel wires arranged in the pipe wall of the pipeline body respectively; and a negative pressure device or a flushing device or a pair of operating forceps can be externally connected to the Y-shaped structure at the tail end of the pipeline body. The visual and steering-controllable abscess debridement device has the advantages that use is convenient, the operating view can be clearly displayed, and meanwhile the purpose of fully debridement of the large abscess cavity is achieved.