76results about How to "The impact of reducing image quality" patented technology

The invention discloses a super-resolution linear array three-dimensional synthetic aperture radar imaging method based on an MUSIC (MUltiple SIgnal Classification) algorithm, which comprises the steps of: firstly, compressing distance data by adopting pulse; secondly, focusing scene information by adopting the MUSIC algorithm for each distance section, obtaining reverse scattering information ofa scene point by adopting an LS (Least Square) algorithm; and finally, integrating processed distance sections and displaying to obtain a three-dimensional reconstruction graph. Compared with the traditional imaging methods, such as a BP algorithm and an MF algorithm, the super-resolution linear array three-dimensional synthetic aperture radar imaging method has the advantages of overcoming the problem of Rayleigh limit and limited antenna length, realizing sidelobe weakening by using an MUSIC method while the length of an antenna is not increased, reducing the influence of sidelobe crosstalkto imaging quality, increasing resolution, realizing three-dimensional imaging and improving imaging quality.

The invention provides a head-wearing multi-depth three-dimensional image display system comprising a processing unit, a multi-plane optical unit, a projection unit, and a visual unit. The processingunit receives three-dimensional image information, extracting color data and three-dimensional coordinate data representing depth information of each pixel point in the three-dimensional image, and distributing all the pixel points into a plurality of pixel point groups corresponding to different space depths according to the three-dimensional coordinates of the pixel points. The multi-plane optical unit comprises a plurality of layers of transparent state / scattering state-controllable transparent scattering elements. The projection unit selectively projects each pixel point group to a transparent scattering element representing the corresponding depth with a certain frequency to generate a relay three-dimensional image which is visual in the multi-plane optical unit. The visual unit comprises an eyepiece lens which can project the relay three-dimensional images in the multi-plane optical unit to human eyes. The three-dimensional display effect of the display system is good; the display system can ease visual fatigue of users. The invention also provides a multi-depth three-dimensional image display method.

The invention discloses a robot grabbing system. The robot grabbing system comprises a visual inspection device and a grabbing execution device which is used for grabbing workpieces and connected with the visual inspection device. The visual inspection device comprises a visual sensor for acquiring images. By the adoption of the robot grabbing system, data acquisition is conducted through the visual sensor, the influence of the ambient light on the imaging quality is lowered, besides, the positioning accuracy of the workpieces is improved, and the instantaneity of workpiece grabbing is higher. The invention further provides a workpiece grabbing method.

The invention discloses a high-accuracy alignment mark structure based on machine vision alignment. The shape structure of the high-accuracy alignment mark structure based on the machine vision alignment is in an asymmetric shape, wherein the asymmetric shape comprises non-axial symmetry and non-central symmetry; the high-accuracy alignment mark structure based on the machine vision alignment at least comprises a line array, and the lines of the line array are ranked in parallel; the width of the lines in the line array is different from the width of the line seam among the lines; and the lines in the line array are ranked in a staggered mode. The high-accuracy alignment mark structure disclosed by the invention reduces the influence on the imaging quality of alignment mark figures because of process factors such as optical proximity effect, corrosion accuracy control and the like, thereby enhancing alignment accuracy and alignment efficiency.

The invention discloses a radio frequency tomography positioning method capable of relieving the influence of background electromagnetic waves. The radio frequency tomography positioning method has the advantages that a background received signal strength (RSS) measuring result is divided into a background noise part and an environment inherent influence part through a singular value decomposition manner, the environment inherent influence is removed during imaging, and the influence of environment change on imaging quality is minimized; according to the feature that RSS change of wireless links influenced by a target is evident and the RSS change of the wireless link not influenced by the target is relatively small, the principle of maximum distance between classes is used to divide measured wireless links into effective links influenced by the target and ineffective links not influenced by the target, only the effective links are used to perform imaging during positioning, calculation resources and storage resources needed can be reduced, influence of outlier links on the positioning result can be removed during solving, and accuracy and robustness of the positioning result can be increased.

The invention discloses a super-resolution image reconstruction-based synthetic aperture sonar imaging method, which comprises: expanding aperture according to an original sonar aperture array; dividing the expanded aperture into sub apertures; estimating the round trip time of detecting acoustic waves; orthogonally encoding transmission acoustic waves and detecting a target water area; and imaging the target water area with a super resolution. In the invention, a high-resolution sonar image is obtained by combining super-resolution image reconstruction technology and SAS processing technology. Compared with synthetic aperture sonar before expansion, the expanded synthetic aperture sonar has improved resolution in terms of direction and distance; and compared with the conventional synthetic aperture sonar technology of the same aperture, the expanded synthetic aperture sonar has improved resolution in terms of direction and distance.

The invention provides a graphene mesh / double-layer metal mesh transparent electromagnetic shielding device having a bidirectional wave-absorbing effect, belongs to the technical field of optical transparent part electromagnetic shielding, the electromagnetic shielding device utilizes different light-transmitting and microwave shielding characteristics which are shown when a graphene mesh film has different mesh unit hole area ratios, characteristics of low reflection and partial absorption of microwaves of the graphene mesh film and a strong electromagnetic reflection characteristic of a high-light-transmitting double-layer metal mesh are organically combined, and the multilayer graphene mesh film is arranged at two sides of the double-layer metal mesh to form a multilayer stacked structure; the double-layer metal mesh is used as a transparent reflecting layer, and N layers of graphene mesh films separated by transparent mediums are used as transparent absorbing layers; the structure can enable radio frequency radiation at two sides of the device to pass through the absorbing layers for many times to be strongly absorbed, bidirectional strong shielding and low reflection characteristics are realized, and visible light only penetrates through the stacked structure only once and a high light transmittance is achieved; and the electromagnetic shielding device solves the problem that an existing transparent electromagnetic shielding method cannot give consideration to bidirectional low electromagnetic reflection, strong electromagnetic shielding and high light transmittance at the same time.

The invention provides an optical lens and an imaging device. The optical lens sequentially comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lensand an optical filter from an object side to an image side along an optical axis, and satisfies the following conditional expression of SAG8D0.5 / SAG8D1> 0.35, wherein SAG8D0.5 represents the vector height at the 1 / 2 aperture of the image side surface of the fourth lens, and SAG8D1 represents the vector height at the full aperture of the image side surface of the fourth lens. According to the invention, the optical lens and the imaging device effectively reduce the influence of ghost images on the imaging quality, realize a high-definition imaging effect, have the advantage of high imaging quality, and can effectively improve the shooting experiences of users.

The invention discloses a finger vein recognition encryption system based on an ARM processor. The system comprises an acquisition module, an image processing module and an upper computer. after a finger vein recognition encryption authentication system is started. the acquisition module can perform image acquisition in a range controlled by the image processing function module; an acquired fingervein original image is transmitted to the image processing function module through the USB interface; preprocessing and feature extraction are carried out on the image; and finally, the acquired images of the finger veins are transmitted to an upper computer for storage by taking an image processing function module as a client and an upper computer as a server through a Socket technology, so thatthe acquisition of the finger veins can be remotely managed, and the working state of the finger vein device can be monitored.

The invention discloses an automatic focusing method of an electron microscope. The method comprises the following steps of initializing a stepping motor, arranging the stepping motor at an initial position, acquiring a first picture; performing full-picture processing on the first picture, obtaining t areas with most obvious image changes, and outputting gradient outburst values of t areas; after one picture is processed, calculating and outputting t gradient outburst values, and frontwards moving the stepping motor by pi step lengths each time until the whole stroke is finished; respectively fitting all gradient outburst values and corresponding motor positions in the t areas for forming t secondary curves, finding out a motor position which corresponds with a peak value from the secondary curves, wherein the position is the focal length which corresponds with a highest-definition image; moving the stepping motor to the position for finishing focusing, and simultaneously acquiring the image and displaying. The automatic focusing method can eliminate the effect of different ambient lights and different photographed object material surfaces on the automatic focusing effect of the electron microscope.

The invention provides magnetic resonance imaging equipment capable of reducing vibration noises of a gradient coil. The magnetic resonance imaging equipment comprises a superconducting magnet assembly (1) and a gradient coil assembly (2), and is characterized by further comprising a damping layer (3); and the damping layer (3) is arranged between the superconducting magnet assembly (1) and the gradient coil assembly (2). According to the magnetic resonance imaging equipment capable of reducing the vibration noises of the gradient coil provided by the invention, damp of a medium between a superconducting magnet and the gradient coil is improved, so that the noises caused by the gradient coil can be obviously reduced. The magnetic resonance imaging equipment has the specific advantages in that the noises of the magnetic resonance imaging equipment in scanning and imaging processes can be reduced; the influence of the noises on a scanning target can be reduced; and the tension feeling of the scanning target can be released. The vibration of the magnetic resonance imaging equipment in the scanning and imaging processes can be reduced; and the influence of vibration on the imaging quality can be reduced. The magnetic resonance imaging equipment has the application advantages of low implementation cost, and simplicity and easiness in operation.

The invention discloses an optical lens and imaging equipment. The optical lens sequentially comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an optical filter from an object side to an imaging surface along an optical axis, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface near the optical axis; the object side surface of the third lens is a convex surface near the optical axis, and the image side surface of the third lens is a concave surface near the optical axis; the fourth lens has positive focal power, and the image sidesurface of the fourth lens is a convex surface; the fifth lens has negative focal power, the object side surface and the image side surface of the fifth lens are both concave surfaces near the optical axis, and the object side surface and the image side surface of the fifth lens are both provided with at least one inflection point; the optical filter is further arranged. the first lens, the second lens, the third lens, the fourth lens and the fifth lens are aspheric lenses. According to the optical lens, the influence of ghosting on the imaging quality can be reduced, and the balance of highpixel and miniaturization is realized.

The invention relates to an internal scanning type microscopic hyperspectral imaging system and an imaging method, and solves the problems that the imaging optical parameters do not match and the system integration difficulty is large presenting in the existing space scanning type microscopic spectrum imaging technology. The internal scanning type microscopic hyperspectral imaging system comprisesa microscopic imaging system, an adapter port, an internal scanning spectrum imager and an upper computer. The internal scanning spectrum imager is connected with the microscopic imaging system through the adapter port, and transmits signals to the upper computer. The internal scanning spectrum imager comprises a box body, and a hyperspectral imager, a linear displacement table, a driving deviceand a driving control board provided in the box body. The hyperspectral imager is mounted on the linear displacement table, and is connected with the microscopic imaging system through the adapter port. The linear displacement table is driven by the driving device. The upper computer realizes the motion control of the driving device, and acquisition and analysis of image data. The invention further provides an imaging method based on the internal scanning type microscopic hyperspectral imaging system.

The invention provides a camera module. The camera module comprises an image sensor and an optical filter, wherein the image sensor comprises an optical sensing surface for receiving incident light imaging, the optical sensing surface comprises a sensing area and a non-sensing area surrounding the sending area, and multiple bonding pads are formed in the non-sensing area. At least one metal ball is stacked on at least three bonding pads; the number of the metal balls of each bonding pad is the same, and the optical filter is arranged on the metal balls. According to the camera module, by use of the metal balls, the image sensor and the optical filter can be isolated at a quite long distance so that the effects exerted on imaging quality by dust possibly adhered to the optical filter can be reduced, and the imaging quality is improved.

The invention discloses a camera module. The camera module comprises a lens module, a shell, a bottom plate and a photosensitive chip, the mean square error radius of the focusing image point when thedistance from the object point on the optical axis to the object space main surface of the lens module is smaller than 40mm is smaller than the mean square error radius of the focusing image point when the object point on the optical axis is located at infinity; the lens module sequentially comprises a first lens group, an aperture and a second lens group from the object side to the image side ofan optical axis, the first lens group and the second lens group have positive focal power. The object-side clear aperture of the first lens group is larger than the image-side clear aperture of the first lens group, and the object-side clear aperture of the second lens group is smaller than the image-side clear aperture of the second lens group, and specific process parameters of the position relationship between the lens module and the photosensitive surface of the photosensitive chip are given. The structure is beneficial to reducing the distance from the image side end surface of the lensto the photosensitive chip during close-range imaging, avoids adopting a distance increasing mode to realize close-range photographing, and is beneficial to miniaturization of the structure.

The present invention discloses a difference-based projector street corner imaging method. According to the method, random speckles generated by a projector irradiate an object; the random speckles are diffusely reflected through the wall surface of a street corner, and a bucket detector with no spatial resolution power located at one side of the street corner collects and detects the diffusely reflected light of the wall surface; after the light intensity value of the bucket detector is calculated, the difference information of the object is taken as an imaged object, and a difference value is used to replace the light intensity value, the average intensity fluctuation of a light field is removed; by means of second-order correlation, the image of the object that cannot be directly imagedon the street corner can be obtained; the influence of noises on an imaging result are considered, when the resolution of the object is small, the SNR (signal to noise ratio) of GI (Ghost Imaging) islow due to the interference of background light, and therefore, a differential algorithm is introduced to reduce the influence of the noises, and as a result, imaging quality can be effectively improved. The method of the invention has the advantages of structural simplicity and convenience in realization, can satisfy the needs of street corner monitoring and imaging, and has a bright applicationprospect.

The invention provides an optical fiber axial nondestructive on-line detection device and method, which belong to the technical field of optical fiber device processing and manufacturing, and solve the problem that the fixed axis of a 40-micron ultra-small-diameter polarization maintaining optical fiber is simultaneously suitable for various special optical fibers. The device comprises an image processing device, a rotating part, an optical fiber clamp, an imaging screen, a coherent light emitter and an image recording device. The optical fiber clamp is installed on the rotating part and usedfor clamping an optical fiber, and the rotating part is used for driving the optical fiber to coaxially rotate through the optical fiber clamp. The coherent light emitter and the imaging screen are arranged on the two sides of the optical fiber clamp respectively, and light beams emitted by the coherent light emitter are used for vertically irradiating the optical fiber. A central bright spot filtering part is arranged on the imaging screen; and the image recording device is arranged on one side of the imaging screen towards the optical fiber clamp and is connected with the image processing device. The imaging screen is provided with the central bright spot filtering part, thereby reducing the impact on the imaging quality from the central bright spot, improving the imaging quality, and improving the fixed axis accuracy through the detection device.

The invention provides a PET (Positron Emission Tomography) detector, a PET imaging system and a PET tester. The PET detector comprises a semi-continuous crystal and a photoelectric detector array coupled to the semi-continuous crystal. The semi-continuous crystal is a scintillation crystal formed by coupling multiple internally uncut continuous crystal plates in the cascading order in the width direction. The semi-continuous crystal is cut into multiple continuous crystal plates in the length direction, and the multiple continuous crystal plates are coupled in the cascading order in the width direction of the semi-continuous crystal. Through the PET detector, the PET imaging system and the PET tester provided by the embodiments of the invention, full-field high spatial resolution and high efficiency can both be achieved at low cost.

The invention discloses a diameter parameter randomization-based overlapping ring grid designing method belonging to the technical field of electromagnetic shielding of optical windows. The randomizedparameters of an overlapping ring grid include diameter and period parameters; and the diameters of rings are randomized within a symmetric range of employing an initial diameter value as the centerto obtain the randomized grid by adopting a randomization mode of individually randomizing the diameter parameter. According to the randomization method, the diameter values of various ring units in the grid can be effectively changed, so that the structure of the overlapping ring grid is effectively randomized. Compared with a traditional grid of a periodic structure, high-level diffraction energy of the grid can be effectively homogenized through the randomized grid with a plurality of ring units of different diameters, distribution of stray light is more uniform and the influence on the imaging quality is significantly reduced.

The invention provides a dechirping one-bit acquisition method and system for broadband radar echoes, and the dechirping one-bit acquisition method comprises the steps: carrying out the frequency shift processing of a dechirping echo signal after dechirping pulse pressure processing, and obtaining a frequency shift echo signal; sampling the echo signal of the frequency shift to obtain a signal inwhich a higher harmonic frequency spectrum is separated from a dechirped echo frequency spectrum; carrying out one-bit quantization processing on a signal obtained by separating the higher harmonic frequency spectrum from the de-chirped echo frequency spectrum; obtaining echo data, wherein the frequency offset coefficient of the frequency shift processing and the sampling frequency of the samplingprocessing are determined according to the maximum frequency in the de-skewed echo signal. The frequency band of the de-chirp echo signal and the frequency band of the higher harmonics can be effectively separated, the influence of the higher harmonics on the imaging quality is reduced, the imaging quality of the radar is improved, the data processing amount and the hardware cost are reduced, andthe working efficiency is improved.

A dual-layer metal mesh strong electromagnetic shielding optical window possessing graphene interlayers and dual external absorption layers belongs to the optical transparent member electromagnetic shielding technology field. The core devices of the electromagnetic shielding optical window are first, second and third transparent absorption layers and a transparent reflection layer, the first and third transparent absorption layers are both composed of 1-6 layers graphene films separated by the transparent mediums, the second transparent absorption layer is composed of 1-3 layers of graphene films separated by the transparent mediums, and the metal meshes A and B form the transparent reflection layer. The first and third transparent absorption layers are placed at the two sides of the transparent reflection layer respectively, and the second transparent absorption layer is placed between the metal meshes A and B. The dual-layer metal mesh strong electromagnetic shielding optical window possessing the graphene interlayers and the dual external absorption layers solves the problem that a conventional transparent electromagnetic shielding method can not consider the low-electromagnetic reflection, the bidirectional strong electromagnetic shielding and the high light transmission simultaneously, and has the characteristics of high light transmission performance, bidirectional strong electromagnetic shielding and low electromagnetic reflection.

The invention discloses a design method for an overlapped circular ring mesh based on random circle center position and variable diameter, and belongs to the technical field of electromagnetic shielding of optical windows. Random parameters of the overlapped circular ring mesh comprise diameter and period parameters. The random fashion is which the diameter parameter and the period parameter are random simultaneously is adopted, the random period is realized through the random circle center position, the random area of the circle center position is divided into polygonal areas such as quadrangular and hexagonal areas as well as circular areas respectively, and the diameter parameter is randomized in a symmetrical range taking an initial diameter value as the center. The circle center position of each circular ring unit inside the overlapped circular ring mesh is randomized inside a fixed area so as to obtain the overlapped circular ring mesh of a random structure, and the random methodcan effectively randomize the period and diameter of a circular ring inside the mesh structure. Compared with a traditional mesh of a periodical structure, the overlapped circular ring mesh based onthe random method can effectively homogenize the high-grade order diffraction energy of the mesh, so that the distribution of stray light is more uniform, and the influence on imaging quality is obviously reduced.

The invention discloses an imaging lens, which comprises, from an objective side to an image side, a first lens, a second lens, and a third lens along an optical axis. The first lens is the biconvex lens, and is provided with the positive refractive power. The second lens is the biconcave lens, and is provided with the negative refractive power. The third lens is provided with the positive refractive power. The first lens and the second lens are attached together in an adhesive manner to form the adhesive lens, which is provided with the power refractive power. The first lens and the second lens are capable of satisfying the following condition:1,29<=f 12 / f<= 1.34, and f 12 is the combination effective focal length of the first lens and the second lens, and f is the effective focal length of the imaging lens.

The invention discloses a head-mounted virtual reality device, and relates to the technical field of virtual display. The device comprises a front shell, a back shell, a motherboard, a first surface display, a second surface display, and a display stand. The motherboard is fixed to a side of the display stand near the front shell. The first surface display and the second surface display are fixed to a side of the display stand away from the back shell, and are connected with the motherboard. A first optical lens and a second optical lens are arranged on the back shell. The center of the first surface display and the center of the first optical lens are in the same line. The center of the second surface display and the center of the second optical lens are in the same line. Through use of the first surface display and the second surface display, the imaging positions of light at the edges of the first optical lens and the second optical lens are closer to the meridian focus. Thus, the influence of astigmatism and field curvature on the quality of imaging is reduced, and the imaging resolution is improved.

The invention is suitable for the technical field of optical window electromagnetic shielding, and provides an optical window electromagnetic shielding metal mesh and a preparation method thereof.The method comprises the steps that a regular polygonal metal mesh is prepared on the surface of an optical window, and polygons in the regular polygonal metal mesh are the same in size and shape and are tightly connected; for each polygon, randomly selecting two points on any two edges of the polygon, connecting the two points by using a metal wire, and randomly dividing each polygon into two polygons to obtain an irregular polygonal metal mesh; detecting whether the structural parameters of the irregular polygonal metal mesh reach a preset standard or not; and if the structural parameters do not reach the preset standard, repeatedly executing the step of randomly segmenting each polygon in the irregular polygonal metal mesh into two polygons until the structural parameters reach the preset standard. The random electromagnetic shielding metal mesh with good photoelectric performance can be prepared, and the imaging quality is improved.

The invention discloses a lens cone structure of a large-aperture solar telescope. The lens cone structure comprises a four-leaf beam, an F1 focus, a truss, a four-way joint and a balance weight; thetruss is fixedly connected to the upper portion of the four-way joint; the four-leaf beam is fixedly connected with the upper end of the truss; the F1 focus is fixed to the portion, below the four-leaf beam, of the truss; and the detachable balance weight is arranged at the lower end of the four-way joint. The main lens chamber of the solar telescope is connected with the four-way upper ring; thelens cone pitch axis of the solar telescope is located on the upper center of the four-way joint; and the main lens chamber of the solar telescope is completely exposed on the four-way joint. The lenscone structure is convenient to mount and dismount; the counterweight weight of the lens cone can be effectively reduced, and the influence of the turbulence phenomenon formed by the heat effect of sunlight irradiated on the four-way joint on the imaging quality of the telescope can be effectively reduced; the area of sunlight irradiated on the surface of the truss can be effectively reduced, sothat the influence of turbulence formed by heat effect on the imaging quality of the telescope is reduced.

The invention relates to the technical field of medical apparatuses and instruments and discloses a surgical imaging device based on a polarizing extinction principle. By configuring polarizers in an imaging assembly and an illumination assembly of the surgical imaging device, reflected light on the surfaces of the tissues in orifices and non-orifice organs can be filtered out by utilizing the polarizing extinction principle, accordingly the influence of the reflected light on the imaging quality can be reduced, high-definition images without surface reflected light are obtained, thus tissue information under the surfaces of the tissues is convenient and close to observe, and the accuracy of operations in the internal medicine department is guaranteed. In addition, by orthogonally arranging the polarization directions of two polarizers, the surface reflected light can be eliminated to the most degree, and the clearest tissue surface images of the orifices and the non-orifice organs are obtained. By arranging the polarization directions of the two polarizers in parallel, images with surface reflected light can be obtained without elimination of the surface reflected light, and accordingly flexible section can be performed according to the clinic application demand.

The invention discloses a super-resolution linear array three-dimensional synthetic aperture radar imaging method based on an MUSIC (MUltiple SIgnal Classification) algorithm, which comprises the steps of: firstly, compressing distance data by adopting pulse; secondly, focusing scene information by adopting the MUSIC algorithm for each distance section, obtaining reverse scattering information ofa scene point by adopting an LS (Least Square) algorithm; and finally, integrating processed distance sections and displaying to obtain a three-dimensional reconstruction graph. Compared with the traditional imaging methods, such as a BP algorithm and an MF algorithm, the super-resolution linear array three-dimensional synthetic aperture radar imaging method has the advantages of overcoming the problem of Rayleigh limit and limited antenna length, realizing sidelobe weakening by using an MUSIC method while the length of an antenna is not increased, reducing the influence of sidelobe crosstalkto imaging quality, increasing resolution, realizing three-dimensional imaging and improving imaging quality.

The invention relates to a COB camera module and a packaging method thereof. The packaging method of the COB camera module comprises the following steps that the COB camera module including a photosensitive chip is provided; and a protective layer is formed in the surface of the photosensitive chip by means of chemical vapor deposition. The protective layer is made of a homopolymer or copolymer, the homopolymer is one selected from parylene, polystyrene and acrylic polymers, and copolymer is formed by polymerizing at least two selected from parylene, styrene andacrylic ester monomers. According to the packaging method of the COB camera module, impurity particles are not adhered to the photosensitive chip directly in the packaging process, and the photosensitive chip is not damaged in the process of removing the impurity particles. The material of the protective layer has a high optical performance, and the protective layer has lower influence on the imaging quality of the COB camera module.