91results about How to "Small distortion" patented technology

Disclosed are a target recognition device, a training device and method of a target recognition model. The technical field relates to image processing technology, and the target recognition device comprises a processor configured to: acquire a to-be-detected image, the to-be-detected image comprising a target object; process the to-be-detected image based on a target recognition model to obtain first confidence of each category of the target object and second confidence of each occlusion degree of the target object; and determine a target category of the target object based on the first confidence of each category and the second confidence of each occlusion degree. The embodiment of the disclosure can accurately recognize the target object in the occlusion condition, improve the target object recognition accuracy in the occlusion scene, and reduce the safety risk caused by the recognition error.

This application discloses an optical lens. The optical lens, along its optical axis from the object side to the image side, sequentially comprises: a first lens with negative optical power, its object side being convex and its image side being concave; a second lens with negative optical power, its object side being convex and its image side being concave; a third lens with negative optical power, its object side being concave and its image side being concave; a fourth lens with positive optical power, its object side being convex and its image side being concave; a fifth lens with positive optical power, its object side being convex and its image side being convex; a sixth lens with negative optical power, its image side being concave; a seventh lens with positive optical power, its object side being convex and its image side being convex; and an eighth lens with positive optical power, its object side being convex. The effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy: -8.8 ≤ F1 / F ≤ -7.7.

This invention discloses a high-definition lens, comprising a first lens, a first cemented lens group, an aperture stop, a fourth lens, and a fifth lens arranged sequentially from the object plane to the image plane; wherein the first lens and the fourth lens have negative optical power; the first cemented lens group and the fifth lens have positive optical power, and the fifth lens has a biconvex structure; the focal length of the lens is f, and the focal length of the first cemented lens group is f. U1 f U1 The following relationship exists between f and f: 0.35 < |f U1 / f|<0.90. The lens formed by this invention is not only compact and economical, but also ensures high imaging resolution, small aperture and low distortion, which can meet the needs of industrial applications and has great market prospects and economic value.

The application discloses a camera module distortion determination method, a distortion correction method and a depth measurement device. The scheme establishes a mapping relationship between a distortion value of a module and a field angle based on a grating equation. Based on the established mapping relationship, the distortion value of the module can be quickly obtained only by knowing the field angle of the module, so that further design is made according to the distortion value of the module, the distortion value of a receiving module and the distortion value of a projecting module are offset to each other, distortion correction is realized, and the distortion of the whole depth measurement device can be reduced, and the influence of the distortion on the depth measurement precision can be effectively avoided.

The application discloses a protection and distortion control method and system during sound operation, and relates to the technical field of audio processing. An audio signal and a reference signal are acquired; the reference signal is preprocessed to obtain a trigger signal of a level effective value; a trigger threshold is acquired according to the trigger signal of the level effective value; the trigger threshold is adjusted to obtain a preset trigger threshold; the preset trigger threshold is dynamically adjusted according to a voltage value corresponding to a frequency of the audio signal to obtain a voltage value corresponding to the preset trigger threshold; and the audio frequency corresponding to the voltage value corresponding to the preset trigger threshold is a protected and distortion-controlled audio signal. The application realizes dynamic change of a high-frequency cutoff frequency of an audio high-frequency unit while maintaining the loudness of a sound field restoration of a sound system, and improves the protection and distortion control accuracy of the sound in a limit operation state of high power and long time.

The utility model relates to a magnification display device, belongs to the technical field of optical imaging, and particularly relates to a desktop optical imaging magnification display device which comprises a support, a storage barrel and a limiting sliding barrel are fixedly mounted on the surface of the support, a threaded rod is slidably mounted in the storage barrel, a mounting block is fixedly mounted at the end of the threaded rod, and the limiting sliding barrel is fixedly mounted in the mounting block. An imaging assembly is also included; according to the utility model, the effect of obtaining a non-deformation and high-definition magnified picture by using the two lenses easy to process is achieved, and the problems that although a magnified imaging effect can be achieved in the prior art, the height of the imaging device cannot be adjusted, the height of the imaging device cannot be effectively adjusted for users with different body types and heights, and the imaging effect is poor are solved. And the use effect is poor.

The application belongs to the technical field of information security, and discloses an attribute correlation-based differential privacy anonymous method. First, the correlation between attributes is analyzed through data distribution analysis of a data set, the number of each equivalent group of each attribute group is calculated by using permutation and combination, all minimum attribute combinations are found, if the number of each equivalent group of the attribute combination is greater than or equal to 30, and there is an equivalent group with a number less than 30 in each equivalent group when any attribute is added, the attribute combination is a minimum equivalent group. Then, the set condition of each attribute is obtained by performing intersection on all minimum attribute groups, the number of each attribute under the intersection is calculated, then the priority of the attributes with intersection is divided, the intersection number is used as the privacy protection priority of the attribute, privacy budget is allocated through the privacy protection priority of each attribute, and finally, the attributes with intersection are protected by differential privacy.

This invention provides a projection lens. The projection lens includes a lens group comprising at least eight lenses, which, from a first side to a second side, are sequentially: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with optical power, a seventh lens with optical power, and an eighth lens with optical power. At least one group of lenses from the fourth to the eighth lens is cemented together to form a cemented doublet lens or a cemented triplet lens. The ratio between the combined focal length of the cemented doublet lens and the focal length of the second lens group is greater than or equal to 1 and less than or equal to 8; or, the ratio between the focal length of the cemented triplet lens and the focal length of the second lens group is greater than or equal to 0 and less than or equal to 14. This invention solves the problem in existing projection lenses where it is difficult to simultaneously achieve both high-quality projection and miniaturization.

This application relates to a high-precision visual inspection system and method for product sides, belonging to the technical field of visual inspection. It includes a worktable, a light source, a vision camera, and reflectors. The worktable has an inspection area for placing the product. The light source illuminates the side of the product within the inspection area. The vision camera is positioned above the inspection area. Several reflectors are obliquely arranged on the worktable, each corresponding to a side of the product within the inspection area. The reflectors are located to the side of the corresponding side of the product. When the light source illuminates the side of the product, the light reflected from the side is reflected by the reflectors to the central area of ​​the vision camera. This application achieves high-precision inspection of all sides of a product under single-vision camera conditions, reducing equipment cost and size.

The embodiment of the application discloses a high-definition zoom lens applied to micro-nano high-precision 3D printing, comprising: coaxially arranged lens groups with positive light angles, a diaphragm, a light splitting device, a galvanometer, a protective glass and an imaging surface, wherein the lens groups comprise coaxially arranged first group lenses and second group lenses in sequence, and the diaphragm is located between the first group lenses and the second group lenses. Through the high-definition zoom lens, the printing pixel size can be continuously changed, the lens distortion is small, the relative luminance is high, the light efficiency is high, and the use requirements are met.

The invention relates to the field of atomic interference measurement, in particular to an atomic Raman interferometer based on a flat-topped beam. Comprising two Raman interference subsystems arranged in parallel, each of the two Raman interference subsystems comprises an ultrahigh vacuum cavity and a light path system, and the light path system comprises a flat-topped beam shaping module located on one side of the high vacuum cavity and a Raman light Doppler sensitive configuration module located on the other side of the high vacuum cavity; in the flat-topped beam shaping module, the holographic algorithm principle is adopted, the actual size of atoms in an interference area is combined to determine the size of a target flat-topped beam, the initial complex amplitude is precisely constrained, and a final diffraction phase is obtained through iterative optimization. After the Raman light passes through the diffraction phase, the Raman light is shaped into a flat-topped light beam with a target size and uniform intensity distribution at the ultrahigh vacuum cavity, so that the coherence efficiency under the same interference time is remarkably improved.

Embodiments of the present application provide a projection lens and a projection device. The projection lens comprises, in order from the magnification side to the demagnification side: a first lens group with negative focal power, a second lens group with positive focal power, a diaphragm, a third lens group with negative focal power, and a fourth lens group with positive focal power. The projection lens only comprises one aspherical lens, the aspherical lens is located in the first lens group, and the materials of the lenses comprised in the projection lens are all glass materials.

The utility model discloses a loudspeaker diaphragm supporting structure, which comprises a sound basin, magnetic steel arranged at the bottom of the sound basin, a voice coil and a framework arranged in the cavity of the sound basin, a diaphragm sleeved on the framework, a bracket arranged on the sound basin and used for supporting the diaphragm, a gasket arranged above the diaphragm, and a compression ring arranged above the gasket. The pressing ring is connected with the sound cone through a plurality of bolts, a pressing sheet is arranged at the center above the vibrating diaphragm, the pressing sheet is in threaded connection with the framework, the vibrating diaphragm comprises a vibrating diaphragm main body, a connecting part matched with the framework is arranged below the vibrating diaphragm main body, and a first folding lug is arranged at the edge of the main body; according to the utility model, through multiple mechanical fixation of cooperation of the sound cone bracket and the first folding lug of the vibrating diaphragm, threaded connection of the pressing sheet and the skeleton, and fastening of the pressing ring and the bolt, the risk of easy degumming and sound leakage at part of the sealing edge during long-term use when the sealing edge of the vibrating diaphragm is bonded through a gasket to realize supporting traditionally is avoided, the stability of the vibrating diaphragm and the high efficiency of sound wave conduction are ensured, and the service life of the vibrating diaphragm is prolonged. And the tone quality performance and the service life under high volume are obviously improved.

This application discloses a scanning electron microscope device, comprising: an electron gun, the cavity of which is electrically connected to a first reference voltage terminal; a detector disposed inside the cavity of the electron gun and electrically connected to the first reference voltage terminal; an amplifier, the input terminal of which is electrically connected to the output terminal of the detector and electrically connected to the first reference voltage terminal; and an analog-to-digital converter (ADC), the input terminal of which is electrically connected to the output terminal of the amplifier, a first terminal of the ADC's power supply being electrically connected to the ADC, and a second terminal of the ADC's power supply being electrically connected to a second reference voltage terminal. The aforementioned scanning electron microscope device can improve the quality of semiconductor images generated by the scanning electron microscope.

The invention belongs to the technical field of projection optical lenses, and discloses a projection lens which can form a lens structure with a long back focal length through three lens groups which are respectively used for focusing, zooming and fixing, can obtain higher brightness and contrast through the lens structure with the long back focal length, and is more beneficial to heat dissipation. On the basis, continuous zooming can be achieved through the first zoom lens set, the second zoom lens set and the third zoom lens set which independently move along the optical axis, and meanwhile under the condition that the back focal length is long or the length of the lens is fixed, through the design in the aspects of back focal length control, lens materials and / or lens gluing and the like, continuous zooming can be achieved. The problems of chromatic aberration and difficult light correction caused by a long back focal length lens structure can be solved in the aspects of aberration, chromatic aberration and the like, the contrast ratio and the brightness are better improved, and the purposes of long back focal length, high brightness, low chromatic aberration, low distortion, large aperture and high imaging quality of the projection lens are finally achieved.

The application discloses a small-distortion large-view-field high-definition lens based on Q- TYPE aspheric surface, which comprises first lens elements, second lens elements,..., tenth lens elements and an aperture diaphragm arranged in sequence from left to right, the aperture diaphragm is arranged between the fifth lens element and the sixth lens element, two aspheric surfaces are adopted in total, and the front surface of the first lens element and the front surface of the tenth lens element are both Q- type aspheric surfaces. The application applies the novel Q- type aspheric surface to the design of the wide-angle lens, reduces the weight and processing cost of the lens, realizes small distortion, a large aperture and high pixels, strictly limits the structural parameters of the lens elements, finally realizes the size requirements of a long back intercept, a short total length of the system and a small first surface lens, so as to meet the assembly requirements, improves the processing and detection precision to a certain extent due to the excellent characteristics of the Q- type, and improves the optimization efficiency.

A ferromagnetic coil parallel push-pull type nonlinear offset moving iron and moving magnetic coil double-acting oscillator comprises an oscillator body, the oscillator body comprises an outer cylinder, a first vibration transmission sheet, a second vibration transmission sheet, a first rotor assembly and a second rotor assembly, the first rotor assembly comprises an iron core combination structure, the second rotor assembly comprises a magnet coil combination structure, and the magnet coil combination structure comprises a magnet coil. The first rotor assembly is arranged in the outer cylinder, the second rotor assembly is arranged in the outer cylinder and located on the outer side of the first rotor assembly, the first rotor assembly is fixedly connected with the first vibration transmission piece through at least one site, and the second rotor assembly is fixedly connected with the second vibration transmission piece through at least one site; seen from the center to the outside, the permanent magnet of the magnet coil combined structure is arranged inside, and the coil is arranged outside; the first mover assembly and the second mover assembly are subjected to electromagnetic acting force of pushing force and pulling force in pairs at the same time, and the push-pull type structural characteristic is shown.

This invention discloses a super-linear loudspeaker and its manufacturing method, comprising a square bar-shaped loudspeaker body that cooperates with a display screen. The loudspeaker body includes a support frame, which includes a first-stage frame that cooperates with a sound-generating unit and a second-stage frame that cooperates with a magnetic circuit unit. The first-stage frame and the second-stage frame are arranged in a stepped manner. The magnetic circuit unit includes a magnetic cup and a magnet disposed within the magnetic cup. The sound-generating unit includes a diaphragm disposed at the top of the first-stage frame and a voice coil that drives the diaphragm to vibrate. A magnetic gap is formed between the magnet and the sidewall of the magnetic cup to cooperate with the voice coil. A main frame is disposed between the voice coil and the diaphragm. The top of the main frame is fixedly connected to the diaphragm, and the bottom of the main frame is fixedly connected to the voice coil. By optimizing the loudspeaker shape, adding a small diaphragm structure welded to the back of the FPC, and optimizing the magnetic circuit structure, the low frequency is better during sound generation, and the power consumption, distortion, and space occupation are smaller, resulting in higher loudness.

The application discloses a high-definition wide-angle lens, which comprises, in sequence along an optical axis from an object side to an image side, a first lens with negative optical power, the object side being a concave surface and the image side being a concave surface; a second lens with positive optical power, the object side being a convex surface and the image side being a convex surface; a third lens with positive optical power, the object side being a concave surface and the image side being a convex surface; a fourth lens with positive optical power, the object side being a convex surface and the image side being a convex surface; a fifth lens with negative optical power, the object side being a concave surface and the image side being a convex surface; and an infrared filter between the fifth lens and an imaging surface; the third lens is a glass spherical lens, the first lens, the second lens, the fourth lens and the fifth lens are plastic aspherical lenses, and a diaphragm is arranged between the second lens and the third lens. Through reasonable optical power distribution, the performance of 140-150 degrees of large field of view, optical total length of less than 13.6 mm and full-field MTF of 100 lp / mm being greater than or equal to 50% is realized, and the high-definition wide-angle lens is suitable for fields of vehicle-mounted surround view, intelligent security and the like.

This invention discloses a single-camera optical image separation imaging system based on optical features, comprising an incident light module, a beam splitting module, a reflection adjustment module, and an imaging module. The incident light module, consisting of a front-facing image system and a collimating lens group, collimates the light beam before it is incident on the beam splitting module. The beam splitting module separates the beam into four independent beams. A reflection adjustment module, located between the beam splitting module and the imaging module, adjusts the four beams into separate off-axis beams and reflects them to a broadband achromatic lens group. Finally, these beams are simultaneously imaged onto four different quadrants of the image sensor. The advantages are that the broadband achromatic lens group achieves near-diffraction-limited imaging performance, and the symmetrical structure design with the collimating lens group ensures uniform light intensity distribution across the entire field of view. While reducing cost and size, it is compatible with image separation imaging requirements based on multi-dimensional optical features such as wavelength, polarization state, and focal plane.

The application discloses a power distribution box electricity monitoring method based on big data analysis and relates to the technical field of big data analysis, which comprises the following steps: collecting loop-level electricity and operation data, and obtaining time series data sets through preprocessing; calculating an incremental energy density curve and a distribution entropy curve, and generating a joint sequence sample set; constructing an improved DLinear model to obtain a prediction sequence; performing singular spectrum decomposition and phase space re-embedding to form an abnormal recognition feature vector set; obtaining clustering attribution information based on a mean shift clustering algorithm; performing target risk integration to output a graded alarm result; and generating loop-level electricity monitoring to form an electricity monitoring result. The application realizes reliable electricity trend prediction and abnormal grading positioning monitoring of the power distribution box by combining the improved DLinear model prediction and the risk grading alarm of the mean shift clustering algorithm.

The invention provides a personal care device, a driving device comprises a coil assembly, a main conducting magnet, a coil and a coil holding part used for holding the coil, and the coil holding part is fixed relative to a shell; the magnet assembly is provided with a permanent magnet and a magnet holding part with a magnetic conducting part, the magnet assembly can do linear reciprocating motion along the longitudinal axis of the driving device relative to the coil assembly, and the elastic piece acts between the coil assembly and the magnet assembly and is arranged to apply elastic acting force in the direction of the longitudinal axis. Wherein the drive device comprises a transverse magnetizer arranged transversely to the longitudinal axis, at least a portion of the transverse magnetizer extending inside the magnet holder in a lateral space on one or both sides of the permanent magnet in a direction parallel to the longitudinal axis, the permanent magnet being opposite the coil and forming a transverse gap therebetween, and most magnetic lines generated by the coil do not pass through the transverse gap. The personal care device is stable in operation, low in noise, small in vibration and high in use comfort.

The application provides a Schmitt lens for an industrial camera, comprising: a first lens group, a second lens group and a third lens group arranged in sequence from an object side to an image side along a lens optical axis, wherein the first lens group, the second lens group and the third lens group are all positive lens groups; wherein the second lens group is used as an aperture stop of the Schmitt lens, a ratio of an aperture of the third lens group to an aperture of the first lens group is 0.6-1.1, and the number of lenses in the first lens group is equal to the number of lenses in the third lens group. The Schmitt lens for industrial 3D measurement is optimized and designed, the requirement of clear imaging of the target full field of view is met, and the Schmitt lens has the characteristics of small volume, high resolution and low distortion.

The application relates to an AR lens with an ultrathin wide-angle small head and a projection device, the lens comprising: a first lens, a diaphragm, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from an object side to an image side, the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface is a concave surface; the second lens has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface is a convex surface; the third lens has negative focal power, the object side surface of the third lens is a convex surface, and the image side surface is a concave surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; the fifth lens has negative focal power, the object side surface of the fifth lens is a convex surface, and the image side surface is a concave surface; the effective diameter D (P1) of the first lens satisfies 1.50 < D (P1) < 2.0; and the total optical length TTL of the AR lens satisfies 3.79 <= TTL <= 4.10. The application reduces the total length and cost of the AR lens and improves the resolution.

The invention discloses a high-light-transmission large-target-surface low-cost video conference lens and electronic equipment. The lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side. The first lens has negative diopter, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens has negative diopter, the object side surface is a convex surface, and the image side surface is a concave surface; the third lens has positive diopter, the object side surface is a convex surface, and the image side surface is a convex surface; the fourth lens has positive diopter, the object side surface is a convex surface, and the image side surface is a convex or concave surface; the fifth lens has negative diopter, the object side surface is a convex surface, and the image side surface is a concave surface; the sixth lens has positive diopter, the object side surface is a concave surface, and the image side surface is a convex surface. According to the lens, the full-plastic lens group is adopted, the light transmission capacity with the F number being 1.1 is achieved in the optical design, the maximum distortion of an image plane is lower than 3%, and the working distance covers the range from 0.5 m to infinity.

The application belongs to the technical field of loudspeakers, and particularly relates to a double-magnetic-circuit high-flux-density magnetic circuit structure of a bone conduction loudspeaker. The technical scheme is as follows: a double-magnetic-circuit high-flux-density magnetic circuit structure of a bone conduction loudspeaker, comprising an upper outer ring magnet, an outer ring magnetic conducting member, a lower outer ring magnet, an upper inner ring magnet, an inner ring magnetic conducting member, a lower inner ring magnet and a voice coil; the upper outer ring magnet, the outer ring magnetic conducting member and the lower outer ring magnet form an outer ring magnetic circuit system, the upper inner ring magnet, the inner ring magnetic conducting member and the lower inner ring magnet form an inner ring magnetic circuit system, and the voice coil is arranged in an annular magnetic gap formed between the outer ring magnetic circuit system and the inner ring magnetic circuit system. The application provides the double-magnetic-circuit high-flux-density magnetic circuit structure of the bone conduction loudspeaker, which can guide to improve the magnetic flux density of the magnetic gap and improve the driving efficiency through a more reasonable magnetic circuit structure and magnetic conducting structure.

The present application relates to a kind of big field of view big aperture negative focal length visual optical system and near-eye display device, visual optical system includes: the first lens group close to human eye side and the second lens group close to micro display screen side;Light is emitted from micro display screen, after converging once by the second lens group, then enter human eye by the first lens group, form image;System total focal length is negative, the first lens group and the second lens group both have positive refractive power;The first lens group is sequentially arranged by a piece of positive lens, a piece of negative lens and a piece of negative lens, and the second lens group is arranged by a piece of positive lens, a piece of negative lens, a piece of positive lens and a piece of negative lens.The present application uses big field of view big aperture negative focal length visual optical system, greatly increases the optimization degree of freedom of optical system, greatly improves the imaging quality of entire optical system, realizes the big field angle of visual optical system, high image resolution, low distortion, small field curvature and other indexes, greatly improves the competitiveness of product.

This application provides an electromyography (EMG) signal acquisition circuit, belonging to the field of integrated circuit technology. The circuit includes an acquisition interface, a signal compensation circuit, and an instrumentation amplifier. The acquisition interface is used to acquire EMG differential-mode signals. The input terminal of the signal compensation circuit is connected to the amplification resistor of the instrumentation amplifier, and the output terminal of the signal compensation circuit is connected to the acquisition interface. The signal compensation circuit is used to acquire a compensation signal and perform signal compensation on the EMG differential-mode signal using the compensation signal. The input terminal of the instrumentation amplifier is connected to the acquisition interface, and the instrumentation amplifier is used to amplify the EMG differential-mode signal and output a first EMG signal. This application embodiment can improve the accuracy of EMG signal acquisition.

The invention provides an audio processing method and apparatus, a device and a storage medium. The method comprises the steps of obtaining a current to-be-processed framing sequence from an input audio signal; calculating an inter-frame smooth gain of the current to-be-processed framing sequence according to the initial gain of the current to-be-processed framing sequence and an inter-frame smooth gain of a previous framing sequence adjacent to the current to-be-processed framing sequence; calculating an intra-frame smoothing gain of the current to-be-processed framing sequence according to the inter-frame smoothing gain of the current to-be-processed framing sequence, the inter-frame smoothing gain of the previous framing sequence and the total number of all sampling points contained in the current to-be-processed framing sequence; according to the intra-frame smoothing gain of the current to-be-processed framing sequence and the inter-frame smoothing gain of the previous framing sequence, calculating the target gain of each sampling point in the current to-be-processed framing sequence; and adjusting the value of each sampling point in the current to-be-processed framing sequence to be the respective target gain to obtain an adjusted framing sequence.

The invention relates to an adjustable ophthalmology view inspection device, which comprises a view meter main body, the front end of the view meter main body is provided with an inspection cavity, one side of the view meter main body is provided with a display screen and a transponder, and the lower part and the upper part of the front end of the inspection cavity are respectively provided with a lower mounting box and an upper mounting box; a lower moving seat and a lower driving part capable of driving the lower moving seat to horizontally move are arranged in the lower mounting box, a lower jaw support is arranged on the top surface of the lower moving seat, and two lower jaw clamping plates are symmetrically arranged on the lower moving seat. The head fixing device has the advantages that the first bidirectional driving part and the second bidirectional driving part are used for driving the lower jaw clamping plate and the forehead clamping plate to be clamped at the lower jawbone and the forebone of a patient respectively, and the head of the patient is fixed. The head of a patient is directly fixed in a physical fixing mode, shaking of the head of the patient due to tension and the like is avoided, examination errors are reduced, and the probability that examination results are distorted, invalid and even cancelled can be effectively reduced.