63results about How to "Reduce imaging errors" patented technology

A projection objective of a microlithographic projection exposure apparatus comprises a manipulator for reducing rotationally asymmetric image errors. The manipulator in turn contains a lens, an optical element and an interspace formed between the lens and the optical element, which can be filled with a liquid. At least one actuator acting exclusively on the lens is furthermore provided, which can generate a rotationally asymmetric deformation of the lens.

The application relates to an image processing method and device, a computer readable storage medium and electronic equipment. The method includes the following steps: when detecting that a camera module is turned on, controlling the camera module to acquire a speckle image, wherein the speckle image is an image formed by irradiating laser speckles onto an object; detecting the target temperatureof the camera module, and obtaining a corresponding reference image according to the target temperature, wherein the reference image is an image that is acquired during calibration of the camera module and has reference depth information; and calculating a depth image according to the speckle image and the reference image. According to the image processing method and device, the computer readablestorage medium and the electronic equipment, the accuracy of image processing can be improved.

The invention provides a charged particle beam apparatus capable of preventing image errors in a display image and capturing a clear display image. A display image displayed on a display unit has a rectangular shape having sides that are substantially parallel to coordinate axes of a rectangular coordinate system determined by wafer alignment. A charged particle beam is radiated onto an area including a display image in a direction that is not parallel to the coordinate axes of the reference rectangular coordinate system to scan the area. Then, among image information obtained by scanning, only information of a position within the display image is displayed on the image display unit. In this way, a clear display image without brightness variation is obtained.

The invention discloses a THz ISAR imaging system and an image reconstruction method based on backward projection. The stepped THz ISAR system comprises a THz frequency stepped ISAR imaging system, atwo-dimensional high-precision electronic control rotary table and a stepped motor controller, wherein the stepped motor controller controls the two-dimensional high-precision electronic control rotary table to rotate; the THz frequency stepped ISAR imaging system comprises a frequency hopping module, a radio frequency front end, an intermediate frequency module, a horn antenna module and a signalacquisition and processing module; the two-dimensional high-precision electronic control rotary table comprises ultra-precision shafting, a precision turbine, a worm drive, a grating dial, a liquid crystal screen and a standard computer communication interface; and the stepped motor controller comprises a control unit, a motor drive and a voltage-stabilization circuit.

An objective lens system (2), particularly for a fingerprint reader apparatus, said lens system (2) comprising a first lens (8) formed as a condensing lens guiding light beams arriving from an object generally telecentrically, an aperture stop (9) having a centre (P) and being located in the vicinity of a focal point of the first lens (8), a correcting second lens (10) arranged between the first lens (8) and the aperture stop (9) and juxtaposed with the aperture stop (9), and a correcting third lens (11) formed as a condensing lens and arranged beside the aperture stop (9) opposite the second lens (10). According to the invention, the second lens (10) is a condensing lens with a spherical surface (S3) facing the first lens (8), wherein the curvature centre of the surface (S3) is at a distance shorter than 15% of the curvature radius of the surface (S3) from the centre (P) of the aperture stop (9), and the aperture stop (9) is arranged at a distance shorter than 25% of the focal length of the first lens (8) from the focal point of the first lens (8).

The invention discloses a method for quickly obtaining and measuring an orthophotoquad of a city skyline contour line facede. The method comprises the following steps of: shooting a local image of the city skyline contour line facede hop by hop by a camera with a coordinate obtaining device, and recording the coordinate direction and the lens orientation of the camera at each shooting time; obtaining the horizontal distance between each shooting point and an object to be shot; building a geometric mapping relationship between each shooting point and the object to be shot to generate the orthophotoquad of the city skyline contour line facede; and outputting measurement data of the orthophotoquad of the city skyline contour line facede in combination with the city skyline contour line facede and the orthophotoquad of the city skyline contour line facede. After the method is used, the image distortion error caused by the conventional technology can be reduced, and the measurement precision can be improved.

The invention provides a pitch angle imaging method based on vortex electromagnetic waves, and belongs to the field of radar target imaging. The traditional method is based on electromagnetic wave amplitude scanning, the amplitude scanning range of the traditional method is limited by the working bandwidth of an antenna, and is different from the traditional pitch angle imaging based on vortex electromagnetic waves. The pitch angle imaging method based on vortex electromagnetic waves can work at a single frequency point based on the phase information of an echo signal, so that the pitch angleimaging range is wide, and the requirement on the bandwidth of the antenna is low. The accuracy of amplitude scanning of the traditional method depends on the width of an electromagnetic beam, and thenarrower the electromagnetic beam is, the higher the imaging accuracy is, but the narrower electromagnetic beam is difficult to realize. The imaging precision of the pitch angle imaging method basedon vortex electromagnetic waves depends on the grid thickness during discretization of the pitch angle, and the imaging precision can be effectively improved by adopting thinner grids. The pitch angleimaging method based on vortex electromagnetic waves can realize the measurement of the pitch angle of 5-85 degrees, has wide measurement range, and has the imaging error lower than 1.2 degrees in the range of the pitch angle of 5-85 degrees.

A method for designing an optical device which includes a lens and a microlens array is disclosed. A point spread function (PSF) of the lens including rotationally symmetrical aberration coefficients is formulated, wherein the PSF presents various spherical spot sizes. A virtual phase mask having phase coefficients is provided and the phase coefficients are added to the PSF of the lens, such that the various spherical spot sizes are homogenized. The virtual phase mask is transformed into a polynomial function comprising high and low order aberration coefficients. A surface contour of the lens is determined according to the rotationally symmetrical aberration coefficients and the low order aberration coefficients, and a sag height of each microlens in the microlens array is determined according to the high order aberration coefficients. An optical device using the design method is also disclosed.

The invention discloses a portable multispectral imaging method and a portable multispectral imaging device for mobile phones. The portable multispectral imaging method and the portable multispectral imaging device have the advantages that based on a spectral beam-splitting function of a manual rotation type multispectral imaging device, a self-contained imaging lens, an area-array detector, a matched circuit and a touch screen of one mobile phone match with a matched manual rotation type multispectral imaging component and a wavelength entering an imaging camera of the mobile phone is selected, so that imaging of different spectra is achieved, real-time acquisition, analysis and application of spectral imaging data are completed by software at the mobile phone end supplementarily, and the method and the device can be popularized and applied in daily life.

A data processing apparatus which revises n-bit image data, includes a frame memory which stores therein n−m bit image data of a previous frame; a memory interface which outputs n-bit revision data including upper n−m bits having n−m bit image data of the previous frame outputted by the frame memory and lower m bits having fixed data corresponding to a decimal value 1; a first reviser which revises a color temperature of current frame image data by using n-bit image data of a current frame and the revision data; and a second reviser which revises a gray scale of the current frame image data by using the image data outputted by the first reviser and the revision data.

A method for restructuring partial K data of magnetic resonance based on complex singular spectral analysis includes setting up magnetic resonant image mathematic model of complex coefficient weighting singular function and complex singular spectral analysis model, using partial K data information to carry out model parameter estimation and then utilizing said mathematic model and said spectral analysis model to carry out restructuring of magnetic resonant image.

The invention discloses a cubic visual method for detecting the storage of the coal field: first, equip the paired camera above the coal pile and measure the distance between the focal center and the photic platform; the camera moves along the photic axis and screens the coal piles referring to the center connecting line of the camera and the photic axis to get the pictures of the coal piles; get the theoretical pixel according to the pixel commutation of the coal pile pictures; calculate to obtain the coal pile pictures with the malformation removed and implement edge detecting; abstract the edge information; the area 9 of the edge point of the camera is the matching stencil; calculate the relative coefficient of the suited stencil and the sub-pictures covered by the stencil; select the conjugate point; fit the space curve face of the coal pile and calculate the size and the weight of the coal pile. The invention has high precision and low cost.

The invention discloses a mobile program-controlled multispectral imaging method and a mobile program-controlled multispectral imaging device, which are based on a spectral spectroscopic function of an electric rotary multispectral imaging device. An imaging lens, a plane array detector, a matched circuit and a touch screen, which are prepared by a smart phone, are used for being matched with a matching electric rotary multispectral imaging component, and wavelength entering a smart phone imaging camera is selected, which thus enables the imaging of different spectra to be realized. Furthermore, with the help of a mobile phone terminal software, real-time acquisition and analysis of spectral imaging data is completed, which can be popularized and applied to people's daily life.

A method for producing a final mask layout avoids imaging errors. A provisional auxiliary mask layout that has been produced in accordance with a predetermined electrical circuit diagram is converted into the final mask layer with the aid of an OPC method. Before the OPC method is carried out, a modified auxiliary mask layout is formed with the provisional auxiliary mask layout by a procedure in which, in a first modification step, the mask structures of the provisional auxiliary mask layout are enlarged or reduced in size to form altered mask structures in accordance with a predetermined set of rules. Then the altered mask structures are supplemented, in accordance with predetermined positioning rules, by optically non-resolvable auxiliary structures to form the modified auxiliary mask layout. The mask layout is produced by the OPC method using the modified auxiliary mask layout.

The embodiment of the invention provides an imaging method and device of a three-dimensional light field display system. The imaging method comprises the steps that light field display information is obtained, and collection information is determined through a first preset relationship according to the light field display information; the three-dimensional light field display system is set according to the light field display information and the collection information, and a parallax image array is obtained through collection; a parallax image index corresponding to a first pixel index is determined through a preset index formula according to the number of parallax images and the pre-established first pixel index; according to the preset pixel number of parallax images in the parallax image array, liquid crystal display panel information and the first pixel index, a parallax image pixel index corresponding to the first pixel index is determined through a preset pixel determination formula; the position of the first pixel index is filled with a pixel value corresponding to the parallax image pixel index, and an imaging image is obtained and subjected to three-dimensional display. The three-dimensional image obtained through the imaging method and device is free of deep overturning phenomenon, the structure is simple, and the imaging error is small.

In a method for describing a retardation distribution of a light bundle emerging from a selected field point, which passes through a birefringent optical element contained in an optical system of a microlithographic projection exposure apparatus, a distribution of retardation vectors is determined so that precisely one direction of a retardation vector is allocated to each directionless orientation of the retardation. The retardation vector distribution is then at least approximately described as a linear superposition of predetermined vector modes with scalar superposition coefficients.

The invention discloses a method for line laying operation guided through an image. According to the method, a hypothetic elevation, a hypothetic spatial point, an azimuth angle and a vertical angle are adopted to reckon the theoretical imaging position of a spatial real point in an image. Through the method, a theoretical real plumb line or part of the plumb line (namely pile line or independent image point) of to-be-laid plane coordinate data is plotted in an image shot for a area for allowing a line to be laid; foresight staff hold a surveying rod to a line laying site and erect the surveying rod at a site position where the central axes of the shadow of the surveying rod in the images shot by multiple photographic devices overlaps with the independent image points in the images where the shadow of surveying rod is positioned, or overlaps with pile lines of the images where the shadow of the surveying rod is positioned, and the site position is the accurate position of the laid line on the spot.

The invention relates to a compact lens with fixed or variable focal length for digital image acquisition. According to the invention, a refractive optical element of the lens or a group of elements on a light entry side of the lens is provided as a compound lens having a first lens element from a glass or optical ceramics with a first index of refraction and a second lens element from a plastic with a second index of refraction which is smaller than the first index of refraction, the first lens element being located on the beam path in front of the second lens element and on a light entry side of the lens. The lens also comprises at least one diffractive optical element. With a compactly built lens, imaging errors can thus be minimized by simple means. The diffractive optical element directly on or at a transparent cover is preferably made or provided for covering the detector array. Another aspect of the invention relates to a digital image acquisition device with such a lens.

In a method, by a magnetic resonance device, a transmit B1 field map is determined for a region, a plurality of MR images of at least one part of the region are acquired using transmitter settings differing from each other, and signal intensities of individual pixels measured by the MR images are interpolated by the transmit B1 field map. A correction of the signal intensities may also be effected by carrying out a receive B1 correction by a spatial mirroring of the transmit B1 field map on a symmetry plane of a measured object. A magnetic resonance device is used to carry out the method. The method may be applied, for example, in medical diagnostics.

The invention provides a lens module comprising: a mirror seat provided with female threads on the inner wall; a first limit ring with male threads on the outer wall disposed screwably at the first position of the mirror seat inner wall; a second limit ring with male threads on the outer wall disposed screwably at the second position of the mirror seat inner wall; a cylinder with an outer diameter bigger than the inner diameters of the first limit ring and the second limit ring; at least one glasses lens contained in the cylinder, a first magnetic force generator disposed connectingly on the cylinder; and a second magnetic force generator fixed on the second limit ring. The first magnetic force generator and the cylinder are repulsed to the first limit ring when the facing magnetic pole of the second magnetic force generator and that of the first magnetic force generator are same; the first magnetic force generator and the cylinder are attracted to the second limit ring when the facing magnetic pole of the second magnetic force generator and that of the first magnetic force generator are opposite. The invention also provides a camera die set using the lens module.

The invention relates to an interferometic microwave radiometer clock scanning imaging device comprising unit antennas, radio-frequency receivers, antenna arms, conductive slip rings, a radio-frequency rotary joint, a digital plate and clock module, a three-axis turntable, a turntable bracket and a numerical control processing cabinet. The imaging device is characterized in that the unit antennas are mounted on first-stage and second-stage mounting surfaces of the three-axis turntable, double-speed rotary scanning around the same center rotating shaft in the same plane can be realized, and signal transmission between the radio-frequency receivers and the digital plate and clock module and the numerical control processing cabinet is carried out through the slip rings and the radio-frequency rotary joint. The device has the following beneficial effects: the double-speed rotary scanning work mode of the unit antennas is realized; the transmission problem of signals is solved; and a two-stage superimposed independent-control turntable mechanism is adopted, and the digital plate and clock module is placed on the second-stage bearing surface of rotation.

The invention provides a charged particle beam apparatus capable of preventing image errors in a display image and capturing a clear display image. A display image displayed on a display unit has a rectangular shape having sides that are substantially parallel to coordinate axes of a rectangular coordinate system determined by wafer alignment. A charged particle beam is radiated onto an area including a display image in a direction that is not parallel to the coordinate axes of the reference rectangular coordinate system to scan the area. Then, among image information obtained by scanning, only information of a position within the display image is displayed on the image display unit. In this way, a clear display image without brightness variation is obtained.

The invention provides a line scan apparatus, and a method applied to the same. More specifically, a transport line formed by a transport mechanism is provided with at least one examination area used for examining test portions. Thus, image errors when shooting an examination area can be remarkably reduced and modularized transport machine devices can be provided according to all examination areas.

The invention discloses a measuring system of relative position of a laser mode and an aperture and a measuring method thereof, and mainly solves the disadvantage of low measurement precision of present systems. The whole system comprises a laser (1), an optical system (15), a resonator to be measured (6), a spectroscope (7), a total reflective mirror (8), an image acquisition and data acquisition system (16), a main control computer (13), and a piezoelectric ceramics driver (14); the piezoelectric ceramics driver drives the laser to output laser; the optical system is adjusted to allow the laser outputted by the laser to be coupled to the resonator to be measured; the laser outputted by the resonator to be measured are divided into two paths by the spectroscope and the total reflective mirror; the two-path laser is collected and transmitted to the main control computer by the image acquisition and data acquisition system; the main control computer processes images of the aperture andthe laser mode by using a high-precision image processing algorithm, and calculates the central coordinates of the aperture and the laser mode respectively. The invention has the advantages of synchronous CCD camera acquisition and sawtooth wave signals, and high measurement precision, and is applicable to the high-precision automatic regulation of the laser.

A method for designing an optical device which includes a lens and a microlens array is disclosed. A point spread function (PSF) of the lens including rotationally symmetrical aberration coefficients is formulated, wherein the PSF presents various spherical spot sizes. A virtual phase mask having phase coefficients is provided and the phase coefficients are added to the PSF of the lens, such that the various spherical spot sizes are homogenized. The virtual phase mask is transformed into a polynomial function comprising high and low order aberration coefficients. A surface contour of the lens is determined according to the rotationally symmetrical aberration coefficients and the low order aberration coefficients, and a sag height of each microlens in the microlens array is determined according to the high order aberration coefficients. An optical device using the design method is also disclosed.

The invention relates to an MRI image fusion method based on Laplace pyramid transformation and MRI equipment. The MRI image fusion method comprises the following steps: S1, for the features of a brain MRI image, decomposing a plurality of source images by using Laplace pyramid decomposition to obtain different frequency layers, and adopting different fusion rules in the different frequency layersso as to reserve feature information of each source image in the different frequency layers in a fused image; S2, respectively calculating the regional mean value of the top layer and the point sharpness of other layers to serve as fusion scales; S3, performing normalization processing on the regional mean value and the point definition; S4, comparing the normalized region mean value and point definition value of each layer of different source images, and obtaining a fusion result of each layer of images by adopting different fusion strategies; and S5, for each layer of the Laplace pyramid ofthe obtained fusion image, performing recursion downwards layer by layer from the top layer, and finally obtaining the fusion image. By adopting the MRI image fusion method, the multi-focus fusion image with low noise and clear edge can be obtained.

The invention discloses a parallel accelerating imaging method of a blood vessel without contrast agent. The rapid imaging method of the blood vessel without contrast agent includes the following steps: obtaining two different blood flow signal sampling conditions by corresponding to two different blood fluid signals, processing the two different blood flow signal sampling conditions in a k space to obtain an additive signal sampling k space, conducing parallel acceleration sampling in the additive signal sampling k space to obtain k space sampling signals, transforming the k space sampling signals into folded and mixed signals in an image field, spreading the parallel acceleration which is based on N / 2 ghost imaging extension to obtain extended image field signals, and extracting blood flow images of the blood vessel from the extended image field signals. The rapid imaging method of the blood vessel without contrast agent improves the existing parallel acceleration imaging method, extends the corresponding relation of pixel position of various image areas and sensitivity of a radio-frequency coil and enables the improved parallel acceleration imaging method to be combined with the N / 2 ghost imaging method and to be applied to the blood flow imaging of the blood vessel without contrast agent.

Hard imaging methods, hard imaging device fabrication methods, hard imaging devices, hard imaging device optical scanning systems, and articles of manufacture are described. According to one embodiment, a hard imaging method includes providing image data corresponding to a hard image to be formed; generating light responsive to the image data; scanning the light to form a latent image corresponding to the hard image to be formed; accessing correction data corresponding to scanning errors of a scan lens intermediate a rotating reflection device and a photoconductor; and modifying the image data using the correction data before the generating, the modifying comprising modifying to reduce the introduction of image errors resulting from the scanning using the scan lens.