450results about How to "Improving Imaging Efficiency" patented technology

An image capturing optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element has positive refractive power. The third lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens element with negative refractive power is made of plastic material, and has an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric.

Disclosed is an image encoding method. The method includes deriving a motion refinement candidate from among motion information of spatial neighboring blocks, motion information of a temporal neighboring blocks, predefined motion information, and motion information that most frequently occurs in a reference picture, performing a motion information refinement on the derived motion refinement candidate, and generating a prediction block of a current block by using the motion refinement candidate having undergone the motion information refinement.

This invention provides an optical image lens system comprising: a positive first lens element having a convex object-side surface; a second lens element; a positive third lens element; a fourth lens element; a positive plastic fifth lens element having a convex object-side surface and a concave image-side surface, at least one of the object-side and image-side surfaces is aspheric; and a negative plastic sixth lens element having a concave image-side surface, at least one of the object-side and image-side surfaces is aspheric, wherein the shape of the image-side surface changes from concave at the paraxial region thereof to convex while away from the paraxial region thereof.

An apparatus for providing a visual search interface may include a processing element configured to receive indications of an image including an object, receive location information indicative of a location associated with a user providing the indications of the image, and enable performance of a visual search based on the location information and features of the image to identify candidate search results by comparing the image to source images stored in association with a location within a predetermined distance from the location associated with the user.

The invention relates to a magnetic resonance diffusion tensor imaging method which comprises the following steps: performing K space sparse sampling on an imaging object to obtain K space data of a diffusion weighted reference image; performing K space sparse sampling on the imaging object to obtain the K space data of a diffusion weighted image; performing share filling on the K space data of the diffusion weighted reference image and the diffusion weighted image by keyhole imaging; and performing image reconstruction on the K space data after share filling. The magnetic resonance diffusion tensor imaging method and system provided by the invention have the advantages of reconstructing complete data, shortening the scanning time, improving the data acquiring speed and achieving rapid imaging by adopting sparse sampling rapidly and continuously to acquire K space data and performing share filling under the action of the keyhole imaging technology.

An apparatus for a determining relevance and/or ambiguity in a search system may include a processing element configured for receiving visual media comprising a query, determining search results including a matching score for at least one candidate visual media with respect to the query based on ambiguity and relevance, utilizing a mapping function to provide a confidence level associated with the search results, and providing a visualization of the search results based on the confidence level.

The invention relates to an ultrahigh-resolution agile SAR satellite sliding spotlight mode system parameter design method, is applicable to flexible realization of the ultrahigh-resolution imaging SAR satellite sliding spotlight mode system parameter design through whole satellite attitude, and belongs to the technical field of overall design of SAR satellites. According to the method, an accurate orbit, an earth model, system restriction factors, and imaging work characteristics of the sliding spotlight mode are fully considered, an ultrahigh-resolution agile SAR satellite sliding spotlight mode system parameter design method is provided, and an economic and high-efficiency realization method is provided for the ultrahigh-resolution satellite-borne SAR imaging; and the criterion of uniform-beam footprint ground slide speed is employed, ground aiming points of all moments within the whole imaging time are designed, parameters such as the attitude requirement and PRF at an instantaneous moment are calculated, and compared with the conventional method for calculating the parameters according to the mode far away from ground virtual aiming points, the method is higher in precision and imaging efficiency.

The invention discloses a positioning and locating device for radiotherapy and a positioning method of a dynamic target region. A therapy robot has an operating arm, wherein a compact linear electronic accelerator is arranged at one end of an operating arm of the therapy robot, and a secondary collimator is installed at one end of the compact linear electronic accelerator; a robot treatment table is arranged on a corresponding position of a double-image C-arm system, an C-arm sliding rail laser locator is arranged inside the double-image C-arm system, and a left side locator for an C-arm installation space is arranged on a corresponding position at the outer part of the double-image C-arm system. The positioning and locating device provided by the invention is provided with two groups of X-ray image systems, so as to realize binocular imaging; when the C-arm sliding rail rotates and a group of X-ray image systems is started, and CBCT (Cone Beam Computed Tomography) imaging can be realized; according to the positioning method, different imaging ways are adopted for a static target region and a dynamic target region, the rapidity and timeliness of the binocular imaging, the high quality, high definition and image registration of the CBCT imaging can be fully exerted.

A laser radar imaging device based on compressed sensing and an imaging method are disclosed. The device comprises an amplitude modulation laser light source, a beam expanding apparatus, two lenses, a DMD digital micro-mirror, an APD photoelectric detector, a high-pass filter, a multiplier, a low pass filter, two AD analog-digital converters, a control system and an image reconstruction system. After being emitted, the laser is scattered by an imaging object and then is projected to a surface of the DMD digital micro-mirror. Reflected light is focused by another lens, then is received by an APD single point detector and then is converted into an amplified voltage signal. High-pass filtering, mixing and low-pass filtering are successively performed on the voltage signal on one parallel branch and the signal penetrates into the reconstruction system after analog-digital conversion. Simultaneously, the voltage signal directly penetrates into the reconstruction system on another parallel branch after the analog-digital conversion. According to input signals of the two branches and a random matrix corresponding to a DMD control device, a certain reconstruction algorithm is combined so that the reconstruction system can complete imaging. By using the device and the method of the invention, an imaging rate and imaging quality are increased to a great extent.

The present invention relates to an image decoding method. The image decoding method comprises deriving initial motion information of a current block from at least one of motion information of a spatial neighbor block, motion information of a temporal neighbor block, and pre-defined motion information, generating refined motion information by performing motion information refinement for the initial motion information and generating a prediction block of the current block by using the refined motion information.

A magnetic resonance imaging (MRI) water-fat separation method includes acquiring in-phase image raw measurement data and out-of-phase image raw measurement data with an MRI device, reconstructing an in-phase image and an out-of-phase image according to a system matrix and the raw measurement data using the penalty function regularized iterative reconstruction method, and calculating water and fat images according to the in-phase image and the out-of-phase image. The use of the penalty function regularized iterative method eliminates the need for k-space raw measurement data with a 100% sampling rate, thereby reducing the MRI scan time, shortening the entire imaging time, and improving the efficiency of the MRI device.

The invention discloses a landslide MIMO radar monitoring system and monitoring method. Emitting and receiving antennas of the system are an MIMO radar antenna array. Emitting and receiving time-sharing selectors are connected with emitting and receiving antenna array elements respectively. A system synchronization control unit is connected to the emitting and receiving time-sharing selectors through an antenna time-sharing control unit. The monitoring method is characterized by carrying out MIMO antenna array time-sharing emission and step frequency continuous wave signal reception; carrying out inverse Fourier transform and distance compression on echo data, carrying out phase discontinuous correction on radar echo data, calculating time delay compensation factor and carrying out beam forming method azimuth focusing to obtain a high-resolution complex image; carrying out continuous monitoring to obtain a plurality of complex images and forming complex image pairs; and calculating differential interference phase after complex image pair registering and extracting deformation value and carrying out early warning. According to the landslide MIMO radar monitoring system and monitoring method, non-contact remote monitoring is achieved, monitoring range is wide, azimuth resolution ratio is high, real-time performance is high, data acquisition is quick, system device is light and portable, and layout is adjustable.

The invention provides a method and a device for collaboratively dispatching tasks among multiple earth observation satellites. The method comprises the steps of acquiring a directed acyclic graph corresponding to an initial to-be-observed task set of each satellite, wherein the directed acyclic graph comprises the content and a time sequence connection relation of each to-be-observed task; screening out overlapping tasks through comparing the directed acyclic graph of each satellite, wherein the overlapping tasks refer to tasks with the number of executable satellites being at least more than two; predicting an execution effect of each overlapping task according to parameters of the executable satellites; acquiring actual execution satellites of each overlapping task according to the predicted execution effect; deleting the overlapping tasks of the executable satellites except for the actual execution satellites in the initial to-be-observed task set, and generating a final to-be-observed task set of the executable satellites. The embodiment of the invention improves the satellite imaging efficiency and the utilization reasonability of satellite imaging resources.

The invention discloses a synthetic aperture radar efficient autofocus BP method. The synthetic aperture radar efficient autofocus BP method comprises the steps that coarse focus BP imaging is conducted on all pixels in a scene by using a constant speed linear platform track, a small scene region is selected from an image for autofocus BP processing so as to obtain a phase error vector, an accurate APC is obtained with the optimal method on the basis of the phase error vector, and accurate BP imaging is conducted on the whole scene by using the accurate APC. According to the synthetic aperture radar efficient autofocus BP method, only the small pixel region is selected for autofocus BP processing, memory and imaging time are saved greatly, coarse focus BP at the first time and accurate BP at the second time can be executed in parallel in an IMU, and therefore imaging speed and imaging efficiency can be improved more substantially; less memory is occupied and the imaging efficiency is high so that the synthetic aperture radar efficient autofocus BP method can be more suitable for SAR actually measured data processing of large scenes.

The invention discloses a preparation method of RGD-modified ultra-small magnetic iron oxide nanoparticles. The preparation method comprises the following steps: preparing ultra-small magnetic iron oxide nanoparticles by taking ferric acetylacetonate as a reaction raw material and a precursor, taking oleylamine as a surfactant and a reducing agent and taking dibenzyl ether as a solvent; replacing oleylamine molecules wrapped on the surfaces of the nanoparticles by utilizing dopamine-modified HOOC-PEG-COOH to realize PEG-modification of the surfaces of the nanoparticles; and finally, chemically coupling RGD cyclic peptide by virtue of free carboxyl at the tail end of the PEG to obtain the RGD-modified ultra-small magnetic iron oxide nanoparticles. The method of synthesizing the ultra-small magnetic iron oxide nanoparticles has the characteristics of a simple process, a high raw material conversion ratio, strong repeatability and the like. The synthesized magnetic iron oxide nanoparticles have the characteristics of a regular morphology, an ultra-small dimension, good stability, good monodispersity, high biocompatibility, and tumor specific targeting, and the like, and can be used as a T1-weighted imaging high-performance magnetic resonance imaging contrast agent with a tumor active targeting function.

The present invention relates to a method and apparatus for encoding and decoding a video image based on transform. The method for decoding a video includes: determining a transform mode of a current block; inverse-transforming residual data of the current block according to the transform mode of the current block; and rearranging the inverse-transformed residual data of the current block according to the transform mode of the current block, wherein the transform mode includes at least one of SDST (Shuffling Discrete Sine Transform), SDCT (Shuffling Discrete cosine Transform), DST (Discrete Sine Transform) or DCT (Discrete Cosine Transform).

Provided is a video decoding method including obtaining split information indicating whether a current block is to be split; and when the split information indicates that the current block is to be split, splitting the current block into at least two lower blocks, obtaining encoding order information indicating an encoding order of the at least two lower blocks of the current block from the bitstream, determining a decoding order of the at least two lower blocks based on the encoding order information, and decoding the at least two lower blocks according to the decoding order.

This invention provides an image capturing optical system in order from an object side to an image side comprising: a first lens element with positive refractive power having a convex object-side surface; a second lens element; a third lens element; a fourth lens element with both the object-side and image-side surfaces thereof being aspheric, and the fourth lens element is made of plastic; and a fifth lens element with negative refractive power, both the object-side and image-side surfaces thereof being aspheric, at least one inflection point is formed on at least one of the object-side and image-side surfaces thereof, and the fifth lens element is made of plastic. By such arrangement, photosensitivity and total track length of the system can be reduced, and better image quality can be obtained.

This invention provides an image lens system comprising: a first lens element with positive refractive power; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, both the object-side and image-side surfaces thereof being aspheric and made of plastic; a third lens element with positive refractive power; and a fourth lens element with negative refractive power, and at least one inflection point is formed on at least one of the object-side and image-side surfaces thereof; wherein, the region of the image-side surface of the second lens element near the optical axis is concave, but the off-axis region thereof is convex. By such arrangement, not only the photosensitivity and total track length of the system can be reduced, but also better image quality can be obtained.

The invention belongs to the technical field of synthetic aperture imaging and discloses a radar video imaging method based on no-interpolation fusion fast back-projection. First data is subjected tosubaperture division through an FFBP algorithm, and then each subaperture data forms a local rectangular coordinate aperture image with the center of the subaperture as the origin. The subaperture image only utilizes partial aperture data and thus is characterized by having a low azimuth resolution. Every two formed subaperture images are merged to obtain a new higher-resolution sub-image, and theprocess is performed in an iterative manner until a fully resolved polar coordinate image is obtained, and finally the polar coordinate image is interpolated to a rectangular coordinate grid to obtain a final image.