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1252results about How to "Guaranteed image quality" patented technology
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Wide-width off-axis three-reflection-mirror optical system adopting free curved surface
InactiveCN103246053AReduce manufacturing difficultyGuaranteed image qualityOptical elementsOptoelectronicsMeridian plane
The invention discloses a wide-width off-axis three-reflection-mirror optical system adopting a free curved surface, and belongs to the technical field of optics. A conventional off-axis three-reflection optical system adopting a free curved surface has a small field angle, and the adopted totally unbalanced free curved surface has large processing difficulty. The system is a wide-width off-axis three-reflection mirror optical system taking a primary reflection mirror as a free curved surface, and comprises the primary reflection mirror, a secondary reflection mirror, a third reflection mirror and a aperture diaphragm, wherein the aperture diaphragm is overlapped with the secondary reflection mirror; incident light is reflected to the secondary reflection mirror through the main reflection mirror, reflected to the third reflection mirror through the secondary reflection mirror, and then reflected through the third reflection mirror, so that an image is formed; the main reflection mirror is a free curved surface which is symmetrical to a meridian plane, so that the manufacturing difficulty of the system can be reduced; and at the same time, the system has a lager rectangular view field, so that wide-width imaging can be realized.
Owner:CHANGCHUN UNIV OF SCI & TECH
Method for achieving user authentication by utilizing camera
InactiveCN103678984AImprove securityGuaranteed picture qualityDigital data authenticationSpoof detectionUser authenticationFacial recognition system
The invention discloses a method for achieving user authentication by utilizing a camera. The method comprises the following steps: (1) pre-collecting and storing a facial image of a user, (2) performing vivo detection on a facial image of a current user through the camera in the field use process, executing the step (3) if the detection succeeds, and prompting that the detection fails if not, (3) performing field photographing on the current user through the camera and performing storing, (4) comparing the stored facial image of the user with the pre-collected facial image of the user to obtain the degree of similarity, and (5) comparing the degree of similarity and a preset threshold value and determining whether the two compared facial images belong to the same person, wherein it is determined that the two compared facial images belong to the same person if the degree of similarity is greater than or equal to the preset threshold value, and the authentication cannot be passed if the degree of similarity is smaller than the preset threshold value. According to the method for achieving the user authentication by utilizing the camera, because dual detection is performed through a facial recognition system and the vivo detection, the situation of easily invading the system can be effectively controlled, and the security of user data is promoted.
Owner:湖北微模式科技发展有限公司
Splicing device for real-time high speed high definition panoramic video and method thereof
ActiveCN103763479AThe problem of reducing the number of cache linesGuaranteed image qualityTelevision system detailsColor television detailsComputer graphics (images)Video sequence
The invention discloses a splicing device for a real-time high speed high definition panoramic video and a method thereof. The method comprises the steps: S10, obtaining spliced multipath real-time video sequences; S20, judging whether video images at the same moment in any two paths of video sequences meet the image splicing condition; S30, calculating an image splicing parameter; S40, selecting a projection face and mapping the video images in the multipath real-time video sequences to the same mapping face according to the splicing parameter, then determining the panoramic projection face; S50, establishing a mapping table of pixel points on the video images and coordinate points of the overall projection face; S60, conducting exposure and fusion processing on pixel values of all the coordinate points on the panoramic projection face and outputting the panoramic video images according to the pixel values. The splicing device for the real-time high speed high definition panoramic video and the method of the splicing device can greatly improve splicing efficiency of the images, ensure output quality of the images, and meet the requirement for real-time high speed high definition panoramic video.
Owner:SHENZHEN INFINOVA
Method for evaluating star-loaded optical remote sensing image compression quality
ActiveCN101478693AMeet application requirementsQuality assuranceTelevision systemsImage compressionComputer science
The present invention provides a method for evaluating compression quality of satellite-loading optical remote sensing image. The method comprises the following steps: obtaining an analog original image; obtaining the image which is decompressed after compression; respectively analyzing the dynamic range of analog original image and dynamic range of compressed image; respectively analyzing the texture detail of analog original image and texture detail of compressed image; analyzing the application effect of compression to image; analyzing the interrelationship between the analog original picture and compressed image; and evaluating the compression quality of image after synthesizing each item of analytical result to analog original image and compressed image. The invention aims at the characteristic of satellite sensor for generating analog image, adopts a comprehensive method which mainly uses objective evaluation and uses subjective evaluation in auxiliary for evaluating compression quality of image fully, systemtically and purposely. A whole system for evaluating the compression quality of satellite-loading optical remote sensing image is constructed.
Owner:CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
A video image decoding and encoding method and device based on area
InactiveCN101102495AGuaranteed image qualityObjective encoding quality improvementTelevision systemsDigital video signal modificationRegion selectionComputer graphics (images)
The method comprises: 1) encode step, providing the image data, and selecting area for inputting the digital image; making priority classification for the inputted digital image, and making quantization operation for the transformed image data, and recording the priority data; 2) decode step, decoding the location information and priority information of different areas; calculating the quantization value of each area, and using the quantization value to make inverse quantization operation for the data in each area. The structure of the apparatus thereof is: setting a area selection, priority division and quantization unit in the decode device. The decode device comprises an area information decoding and inversely-quantizing unit.
Owner:WUHAN UNIV
Adaptive imaging quality optimization method for unmanned aerial vehicle autonomous inspection of power transmission line
ActiveCN111272148AGuarantee the final image qualityGuaranteed image qualityTelevision system detailsColor television detailsAdaptive imagingImaging quality
The invention discloses an adaptive imaging quality optimization method for the unmanned aerial vehicle autonomous inspection of a power transmission line. According to the present invention, an eventtrigger loop control technology based on an unmanned aerial vehicle spatial position error threshold, an event trigger loop control technology based on a pan-tilt attitude position error threshold and an event trigger loop focusing technology based on a Laplace operator image definition threshold are used in sequence, the imaging quality of the inspection photos is detected at the aspects of photo shooting angle, lens focusing condition, photo clarity and the like, and a corresponding method is adopted for optimization, so that the final imaging quality of the photos is ensured. An iterativethought is adopted, the photo shooting angle is gradually optimized from the shooting position, the head direction and the pan-tilt camera attitude information, and the photo shooting angle precisionis improved, so that a target device is located at the image center position as much as possible, the subsequent focusing, definition adjustment and the like are facilitated, and the imaging quality is ensured. Meanwhile, the adjustment amplitude of the pan-tilt camera attitudes is reduced, and the mechanical loss is reduced.
Owner:JIANGSU FRONTIER ELECTRIC TECH +1
Fast inter-frame mode decision methods applied to transcoding from H.264 to HEVC
InactiveCN105430407AEffective pruningGuaranteed accuracyDigital video signal modificationComputation complexityInterframe coding
Different fast inter-frame mode decision methods applied to transcoding from H.264 to HEVC are adopted for coding units (CUs) of different HEVC depths respectively according to H.264 code stream information and prediction mode information of different depths of the HEVC inter-frame CUs. For CUs of which the depths are 0 and 1, information obtained by decoding an H.264 code stream is processed with a classifier, and decision threshold values used for Skip mode judgement and CU division respectively are calculated. First, Skip mode judgement of a CU is carried out in advance according to the Skip mode judgement threshold value, and then whether the CU is required to be divided into sub-CUs or not is predicted. The methods combine the statistical characteristic of CU division and distribution and the H.264 code stream information, so as to judge a Skip mode in advance, and effectively predict whether CU division is required to be stopped or continued. Therefore, a quadtree can be pruned effectively and unnecessary coding branches are skipped. The methods can remarkably lower the calculation complexity of inter-frame coding during transcoding from H.264 to HEVC.
Owner:TONGJI UNIV
Photographing method and equipment and computer readable storage medium
ActiveCN107613191AImprove accuracyGuaranteed image qualityTelevision system detailsColor television detailsImage acquisitionLight intensity
The embodiment of the invention discloses a photographing method which is applied to a mobile terminal. The method comprises the steps that a photographing instruction is acquired; the photographing instruction is performed, and the light intensity value of the scene to be photographed by the mobile terminal is measured based on the preset exposure parameter; a first exposure parameter and a second exposure parameter corresponding to the light intensity value are determined according to the preset strategy, wherein the second exposure parameter is different from the first exposure parameter; image acquisition is performed based on the first exposure parameter so as to acquire a preview image, and the preview image is previewed; and photographing is performed based on the second exposure parameter after previewing of the preview image is completed. The embodiment of the invention also discloses photographing equipment and a computer readable storage medium.
Owner:NUBIA TECHNOLOGY CO LTD
Image processing method of self-adaptive time domain and spatial domain resolution ratio frame
InactiveCN101778275AEasily damagedReduce computational complexityPulse modulation television signal transmissionDigital video signal modificationTime domainImaging processing
The invention relates to the field of video image processing and provides an image processing method of a self-adaptive time domain and spatial domain resolution ratio frame. The method comprises the following steps: A. an encoder computes and obtains the conditional value of the critical code rate according to the variation of an input video image and a target distribution code rate; B. the encoder compares the conditional value and the threshold value of the critical code rate; if the conditional value of the critical code rate is less than the threshold value, i.e. when the target distribution code rate is less than the critical code rate, the image resolution ratio which is adaptive to the target distribution code rate is obtained through the under-sampling; otherwise, the conventional coding processing is carried out; and C. the encoder recovers and receives the original resolution rate of the image through the upsampling and carries out the conventional coding processing. The method does not cause that the imaged decoded by the encoder produces serious distortion caused by the over-compression or over-quantization of the encoder in the situation of ensuring the low code rate.
Owner:SHENZHEN TEMOBI SCI &TECH
Apparatus and method for nondestructive optical constant imaging of dermatosis tissue of human body
InactiveCN101313847AHigh resolutionImprove clarityScattering properties measurementsDiagnostic recording/measuringHuman bodyFiber
The invention relates to a device for carrying out the nondestructive optical constant imaging of a human body cutis pathologic tissue and a method thereof. The device comprises a tungsten halogen lamp, an incident fiber optic probe, a line array CCD for receiving diffused reflection light, and a grating spectrograph, an amplification filter circuit, an A / D conversion circuit, a computer and a computer-controlled three-dimensional traveling table which are connected in turn through an optical fiber. The invention uses the line array CCD optical measurement device detecting the obliquely incident diffused reflection light to detect the human body cutis tissue, uses a Monte Carlo statistical method limited by characteristic parameters to conversely compute the values of the absorption coefficient and the reduction scattering coefficient at each two-dimensional space coordinates of the detected cutis tissue, then uses the grating spectrograph to carry out spectrum, and respectively images through the absorption coefficient and the reduction scattering coefficient and simultaneously detects the detected human body pathologic tissue and a healthful tissue around the pathologic tissue. Then the optical constants of the pathologic tissue and the healthful tissue are compared to see difference or the optical constant of the pathologic tissue is compared with a healthful human body tissue sample, thereby carrying out the diagnosis and identification of diseases.
Owner:BEIJING NORMAL UNIVERSITY
Holder control method and device
ActiveCN105116926AEasy to controlAchieve self-stabilizing control effectControl using feedbackStable stateImaging quality
The invention discloses a holder control method. The method comprises the steps that a current posture and a target posture of a controlled end, a current posture of a fixed end and rotation inertia ratio of the fixed end to the controlled end on a holder are acquired; according to the current posture and the target posture of the controlled end, the current posture of the fixed end and the rotation inertia ratio of the fixed end to the controlled end, effective mechanical energy controlling the controlled end is calculated and acquired; and according to the effective mechanical energy, the controlled end is controlled to maintain a stable state. The invention further discloses a holder control device. According to the invention, the controlled end reaches the target posture and maintains the stable state; the holder is precisely controlled; body disturbance is effectively isolated; self-stabilization control of the holder is realized; and the imaging quality of a holder load camera is ensured.
Owner:SICHUAN AEE AVIATION TECH CO LTD
Electronic device and control method thereof
ActiveCN108983872AIncrease the screen ratioRealize full screenDigital data processing detailsTelephone set constructionsCamera lensImage resolution
The invention discloses an electronic device and a control method thereof. The electronic device comprises a main board, a display screen and a camera. The display screen is connected to the motherboard. The display screen includes a first display area and a second display area. The camera is connected to the motherboard. The camera is arranged on the side of the display screen adjacent to the main board, the lens of the camera is opposite to the first display area, the resolution of the first display area is smaller than the resolution of the second display area when the camera is in the working state, and the resolution of the first display area is the same as the resolution of the second display area when the camera is in the non-working state. According to the present application, thescreen occupancy ratio of the electronic device can be improved, the overall screen of the electronic device is facilitated, the light transmittance of the first display area can be increased and theimaging quality of the camera is guaranteed when the camera is in operation. Meanwhile, the display effect of the first display area is guaranteed when the camera is not in operation, thereby ensuringthe display effect of the whole display screen.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Display screen and terminal device
PendingCN110062082AImaging effectsGuaranteed image qualityTelephone set constructionsImaging qualityTerminal equipment
The invention relates to the technical field of terminal devices, and provides a display screen and a terminal device. The display screen comprises a display module, a cover plate and a shading unit.The cover plate covers the surface of the display module. The display module is provided with a display module through hole. The shading unit comprises a shading ring and a shading layer, the shadinglayer is attached to the surface of the display module through hole, the shading ring is arranged between the cover plate and the display module and corresponds to the display module through hole in position, and the diameter of the inner ring of the shading ring is smaller than that of the display module through hole. Through the blocking effect of the shading layer, light generated by the display module cannot pass through the surface of the through hole of the display module, so that the imaging effect of the camera is not influenced, and the imaging quality of the camera is effectively guaranteed. By arranging the shading layer, the diameter of the outer ring of the shading ring is reduced, and the imaging quality of the camera cannot be influenced, so that the size of the shading ringcan be further reduced, and the screen-to-body ratio of the display screen is increased.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Large field-of-view bionic compound eye visual system adopting dome light cone
InactiveCN102819053ASolve the problem of severe imaging defocusCompact structureCoupling light guidesMountingsCouplingSurface type
The invention discloses a large field-of-view bionic compound eye visual system adopting a dome light cone. The system comprises a curved surface compound eye lens, an aperture diaphragm, the light cone and an image detector, which are connected with one another in sequence; the curved surface compound eye lens comprises sub eyes and a substrate, the sub eyes are hermetically bonded in the hexagonal array mode, the surface type of the sub eyes are non-spherical, the substrate is a curved surface substrate, the aperture diaphragm is a stepped type aperture diaphragm, and the light cone is a dome light cone. According to the invention, the dome light cone coupling strategy is used as the light path conduction mode, on one hand, a curved image formed by the compound eye lens is converted into a planar image, so as to be received by a plane detector, on the other hand, the large field of view image formed by the compound eye lens is compressed into a smaller image according to an equal ratio, so that the large field of view image can be completely imaged in a small-sized detector in a lossless mode, the coupling is realized, and the technical requirements on the size of detectors are accordingly reduced.
Owner:MDTP OPTICS
Virtual studio implementation method capable of automatically tracking objects
InactiveCN105072314AQuick installationGuaranteed image qualityTelevision system detailsColor television detailsData controlVirtual camera
The invention discloses a virtual studio implementation method capable of automatically tracking objects. The virtual studio implementation method comprises the following steps: selecting a high-resolution real camera and setting a camera position so that the real camera is capable of getting a comprehensive shot of the whole range of the activities of objects without any operation; creating a virtual scene and an image matting plane; setting the position of a virtual camera; performing chroma key image matting on a picture picked up by the real camera and mapping the images of the objects into the image matting plane to form mapped images; calculating the positions of the objects during activities in a real scene by use of an image identification module; generating a group of attitude data based on the position information and controlling the operation of the virtual camera through the attitude data; generating a scene image by an image rendering system based on the picture picked up by the virtual camera; and synchronizing the mapped images and the scene image into an image for final presentation and generating a virtual studio to play videos. The virtual studio implementation method capable of automatically tracking the objects is capable of enabling the installation and debugging of the virtual studio to be simple and fast, and also capable of greatly saving cost.
Owner:黄喜荣
Optical imaging lens unit
InactiveCN108254890AShorten the lengthGuaranteed image qualityOptical elementsCamera lensField angle
The invention discloses an optical imaging lens unit comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from an object side to an image side. According to the invention, with control of concave-convex curved surface arrangement of all lenses, the lens unit is shortened, the field angle is increased, and the diaphragm value is reduced while the good optical performance is kept.
Owner:GENIUS ELECTRONICS OPTICAL XIAMEN
High-safety JPEG image steganography method
ActiveCN103345767AEnsure safetyGuaranteed image qualityImage codingDistortionDiscrete cosine transformation
The invention discloses a high-safety JPEG image steganography method. The method includes the steps of acquiring the quantitative rounding error of each quantitative discrete cosine transformation coefficient in a transformation domain in the JPEG image compression process, and quantitative DCT coefficients x and X before and after rounding, defining corresponding longitudinal distortion and transverse distortion by the utilization of the quantitative DCT coefficient x and X before and after the rounding, building a minimized imbedded distortion model of the longitudinal distortion by the utilization of the quantitative rounding errors, calculating the optimal modification probability of each quantitative DCT coefficient according to the minimized embedded distortion model of the longitudinal distortion, the corresponding longitudinal distortion and the corresponding transverse distortion, converting the acquired optimal modification probability of each quantitative DCT coefficient into ternary distortion, calling check space time trellis codes, embedding a secrete message into the rounded quantitative DCT coefficient X which serves as a carrier, and performing packaging to form an integral JPEG image. The method ensures the safety of the embedded secrete message and good image quality after the secrete message is embedded.
Owner:UNIV OF SCI & TECH OF CHINA
Landslide MIMO radar monitoring system and monitoring method
ActiveCN104991249AFast data collectionAdjustable arrayRadio wave reradiation/reflectionTime delaysData acquisition
Owner:GUILIN UNIV OF ELECTRONIC TECH
Stereoscopic vision detection machine for parts and detection method thereof
PendingCN106872474AAvoid damageExquisite designOptically investigating flaws/contaminationProgramme control in sequence/logic controllersControl systemEngineering
The invention discloses a stereoscopic vision detection machine for parts and a detection method thereof. The detection machine comprises a rotating disc, six shooting stations and a control system, wherein the rotating disc is used for bearing a to-be-detected part and driving the to-be-detected part to rotate; the six shooting stations are used for acquiring six-face images of the to-be-detected part; the control system is at least used for judging whether the to-be-detected part is qualified or unqualified according to the image acquired at each shooting station; when the to-be-detected part is determined to be unqualified, projections of a circular ring formed by a subsequent movement track of the to-be-detected part and a circular ring formed by an initial movement track of the part on the same plane parallel to the rotating disc are concentric and do not coincide with each other. By virtue of the rotating disc made of an optical transparent material, an extra delivery structure does not need to be increased to enable the to-be-detected part to be suspended, and possible damage caused by up-and-down movement of the to-be-detected part is avoided. Moreover, a complicated delivery structure is not needed, the structure is greatly simplified, and partitioned discharging is realized by a dislocation device and a discharging mechanism.
Owner:张天山
Camera module and camera module assembly method
ActiveCN102998765AShort curing timeImprove assembly efficiencyMountingsCamera body detailsCamera lensPhysics
The invention provides a camera module assembly method. The camera module assembly method includes providing an imaging module, a lens base and a lens, providing curable adhesive, coating the curable adhesive in a groove which is jointly defined at one end distant from the substrate by the circumference side of the lens and the inner circumference side of the lens base; adjusting the axial position of the lens and the inclined angle until the lens focuses the image sensor and the optic axis of the lens is superposed on a central normal line of the image sensor, and curing the curable adhesive, wherein the imaging module comprises a substrate and an image sensor arranged on the substrate, the lens base is arranged on the substrate and covers the image sensor, and the lens is held in the lens base and is in clearance fit with the lens base. By the camera module assembly method, assembly efficiency can be improved, and imaging quality of an assembled camera module is guaranteed. The invention further provides the camera module.
Owner:HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
Image acquisition method and device, electronic equipment and computer readable storage medium
ActiveCN109429001ARich in detailsImprove signal-to-noise ratioTelevision system detailsColor television detailsImaging qualityLight signal
The embodiments of the invention provide an image acquisition method and device, electronic equipment and a computer readable storage medium. The image acquisition method comprises the following steps: firstly, acquiring a visible light signal in an incident light to acquire a target visible light image; acquiring a non-visible light signal in the incident light to acquire a non-visible light widedynamic range image; then registering the acquired target visible light image and non-visible light wide dynamic range image to acquire a registered image of the target visible light image and a registered image of the non-visible wide dynamic range image; and finally, fusing the two acquired registered images to acquire a target image, thereby completing image acquisition. The over-exposure phenomenon of the non-visible wide dynamic range image is significantly smaller than that of a non-visible low dynamic range image. Therefore, compared with the prior art, the image acquisition method hasthe advantages that the non-visible wide dynamic range image has richer image details, and the image fusion effect is good, thus guaranteeing the imaging quality of the finally fused image.
Owner:HANGZHOU HIKVISION DIGITAL TECH
Printing plate quality detection system and method
ActiveCN103674962ARelatively high stabilityAccurate focusOptically investigating flaws/contaminationImaging processingHeat sink
The invention relates to a printing plate quality detection system and method. The system comprises a detection platform, an electric device, an image acquisition device and an image processing device, wherein the image acquisition device comprises an annular optical imaging light source, an area-array camera and a laser displacement sensor; the annular optical imaging light source comprises an annular frame body, a heat radiation sheet arranged on the outer side wall of the annular frame body and a plurality of LED (Light Emitting Diode) light sources arranged on the inner wall of the annular frame body; the annular optical imaging light source is used for uniformly illuminating in a focal plane of the area-array camera; the area-array camera is used for automatically scanning a detection object which is horizontally arranged on the detection platform under the irradiation of the annular optical imaging light source to acquire a high-quality image in the horizontal plane and carry out image pattern detection; the area-array camera or the laser displacement sensor is used for acquiring the depth of the detection object in the vertical direction so as to carry out depth measurement; the image processing device is used for carrying out data processing and analysis on image information to finish the quality detection. The system and the method have the advantages of high detection precision, high detection speed and high reliability.
Owner:BEIJING BANKNOTE CURRENCY DESIGNING & PLATING +2
Exposure parameter determining method and apparatus, and readable medium
ActiveCN108769542AQuick fixGuaranteed image qualityTelevision system detailsColor television detailsImaging processingImaging quality
The invention discloses an exposure parameter determining method and apparatus, and a readable medium, and belongs to the technical field of image processing. In the method and apparatus provided by the invention, an exposure evaluation value of a current frame of image and a current exposure parameter are determined; and the exposure parameter for shooting the next frame of image is determined according to the current exposure parameter and a target exposure value of the next frame of image. As the exposure parameter for shooting the next frame of image is determined by using the exposure evaluation value of the current frame of image, the exposure parameter for shooting the current frame of image, namely, the current exposure parameter, and the target exposure value of the next frame ofimage, on one hand, the quick determination of the exposure parameter is achieved, and on the other hand, the image quality of the next frame of image shot by using the determined exposure parameter is also guaranteed.
Owner:BEIJING TUSEN ZHITU TECH CO LTD
Full-automatic quality detection device of micro drill point for drilling PCB
InactiveCN101706256AReal-time precise axial positioning heightGuaranteed stabilityUsing optical meansImaging qualityEngineering
The invention relates to a full-automatic quality detection device of a micro drill point for drilling a PCB in the technical field of tool detection, which comprises a feeding mechanism, a rotary worktable, a micro drill rotary mechanism, a height adjusting mechanism, a vision detection device and a discharging mechanism, wherein the feeding mechanism, the rotary worktable and the discharging mechanism are respectively and correspondingly arranged at a feeding station, a rotary station and a discharging station of a working platform, the micro drill rotary mechanism and the height adjusting mechanism are sequentially arranged at the side face of the rotary table, the vision detection device is arranged at a vision detection station of the working platform, the feeding station and the rotary station are arranged at the same side, the discharging station and the feeding station are positioned at two ends of the working platform, and the vision detection station and the discharging station are positioned at the same side. The micro drill rotary mechanism and the height adjusting mechanism can enable a micro drill to simultaneously realize the circumferential rotation and the axial real-time precise adjustment, can fine adjust the axial positioning height of the micro drill in real time, and ensure the imaging quality of a blade surface and the measurement precision of geometric parameters.
Owner:SHANGHAI JIAO TONG UNIV
PSF fast calibration method based on single-lens imaging
ActiveCN103856723AAvoid repetitionShorten the estimated timeTelevision system detailsImage analysisImaging processingImaging algorithm
The invention discloses a PSF fast calibration method based on single-lens imaging. Firstly, PSF estimation is performed on a group of single lenses of the same type, and a PSF template of the single lenses of the type is obtained by obtaining the average value of a group of PSFs; when other lenses of the type are used, existing complicated PSF estimation methods do not need to be completely repeated, the PSF template serves as an initial value of the PSF estimation iterative optimization process, and time needed in the PSF estimation process can be reduced. According to the PSF fast calibration method based on single-lens imaging, on the basis of the existing single lens imaging algorithm, the PSF calibration speed is greatly improved, a user can conveniently use the method, practical operability is strong, the quality of images is ensured, meanwhile, the cost of the lenses is greatly reduced, the size and weight of the lenses are reduced, and the PSF fast calibration method is of greatly significance in the field of image processing and camera designing.
Owner:NAT UNIV OF DEFENSE TECH
Intelligent digital X ray exposure control device and method
ActiveCN107582085AQuality improvementReduce radiation doseRadiation diagnosticsImaging qualityComputer module
The invention provides an intelligent digital X ray exposure control device and method. The device includes a double-camera automatic calibration module, a double-camera target thickness chart reestablishing module, an input parameter standardizing module, an interest area extraction module based on photographed parts, an image error correcting module based on the photographed parts, a sample settraining module based on the photographed parts and an exposure parameter estimation module based on the photographed parts. According to the intelligent digital X ray exposure control device and method, appropriate exposure parameters can be selected intelligently according to the patient information and the actual thickness of the photographed parts. Not only can the imaging quality be ensured,but unnecessary radiation dosage likely to be performed on patients can be reduced, and moreover, a neural network can constantly learn new illness cases during usage to perfect the exposure control effect. During clinical usage, the intelligent digital X ray exposure control device does not rely on clinical experience of technicians and is convenient to operate without limits, and therefore the device is an ideal automatic exposure control system.
Owner:HEDY MEDICAL DEVICE CO LTD
Large-diaphragm monitoring camera
InactiveCN101943789AAvoid instabilityImprove the correction effectOptical elementsCamera lensOptical axis
The invention discloses a large-diaphragm monitoring camera. From an object along an optical axis, the large-diaphragm monitoring camera comprises a first lens system with a retro focus, an automatic diaphragm and a second lens system with a positive focus, wherein the second lens system comprises at least three lenses; the first lens and the last lens are plastic aspheric lenses, the first lens has the positive focus, and the last lens has the retro focus; and the focus between the first lens and the last lens satisfies the condition of 2.0<|fa / fb|<4.0, wherein fa is the focus of the first lens, and fb is the focus of the last lens. By using two complementary aspherical lenses, the invention does not influence the imaging quality and well corrects the effect of aberration on the premise of ensuring high light flux. Meanwhile, by replacing glass with plastics, the invention can reduce the weight of the overall system and the total length of the mechanism, thereby effectively lowering the cost.
Owner:JIANGXI PHENIX OPTICS TECH CO LTD
Image element motion estimating method and apparatus
ActiveCN101431675AReduce the number of pixelsReduce coding timeTelevision systemsDigital video signal modificationVideo encodingImaging quality
The invention discloses a pixel motion estimation method and a device thereof which relate to the video encoding field. The method and device can reduce encoding time at the same time ensuring image quality. The pixel motion estimating method provided by an embodiment of the invention includes: judging whether satisfying early terminal condition according with obtained matching error value of present optimality matching point searched by median estimation range or origin estimation range when whole pixel searching is processed, if yes, jumping at least one step of searching process subsequently according with asymmetric cross multi-layer hexagon encoding sequence, and judging macro block whether being 16*16 model for searching corresponding block and adjacent frame or upper layer; deciding processing vertical search or horizontal search or multi-layer hexagon search according with distance between the obtained present optimality matching point and vector (0, 0); processing sub-pixel search with various method to the macro block with various moving character when processing sub-pixel search. The invention is suitable for situation that needs video encoding.
Owner:HISENSE GRP HLDG CO LTD
Key playing time point determination method, video playing method and related device
InactiveCN104717571AImprove viewing experienceIncrease flexibilitySelective content distributionComputer engineeringSetting time
The invention discloses a key playing time point determination method, a video playing method and a related device. The key playing time point determination method comprises the steps that it is judged whether a user performs jumps again or exits a play mode according to a video within a set time length after the user performs jumps on the video every time the video is played; if the judging result is negative, a post-operating playing time point corresponding to the jump operation is obtained; key playing time points of the video are determined according to the obtained post-operating playing time points. According to the technical scheme, the problems existing in the prior art that the video playing flexibility is poor and many processing resources are consumed are solved.
Owner:CHINA MOBILE COMM GRP CO LTD
Diffusion tensor imaging method and system
ActiveCN102488519ATroubleshoot issues prone to artifactsShorten the lengthDiagnostic recording/measuringSensorsDiffusionComputer science
The invention relates to a diffusion tensor imaging method, which comprises the following steps of: dividing a K space into a plurality of mutually separated subspaces along a reading-out direction in the K space; divide the mutually separated subspaces along the reading-out direction in the K space; sampling the K space along a phase code direction to obtain data of the K space; and rebuilding the data of the K space to obtain a rebuilt image. In addition, the invention also provides a diffusion tensor imaging system.
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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