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

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 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 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 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.

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 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 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 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.