823 results about "Line scan" patented technology

An apparatus and method for aligning a line scan camera with a Light Detection and Ranging (LiDAR) scanner for real-time data fusion in three dimensions is provided. Imaging data is captured at a computer processor simultaneously from the line scan camera and the laser scanner from target object providing scanning targets defined in an imaging plane perpendicular to focal axes of the line scan camera and the LiDAR scanner. X-axis and Y-axis pixel locations of a centroid of each of the targets from captured imaging data is extracted. LiDAR return intensity versus scan angle is determined and scan angle locations of intensity peaks which correspond to individual targets is determined. Two axis parallax correction parameters are determined by applying a least squares. The correction parameters are provided to post processing software to correct for alignment differences between the imaging camera and LiDAR scanner for real-time colorization for acquired LiDAR data.

A disk drive is disclosed wherein if multiple retries beyond a threshold are required to recover a data sector during a normal read operation, the data sector is added to a marginal sector list. During an off-line scan, the data sectors in the marginal sector list are verified. If the verification of a data sector fails, the data sector is relocated.

A line scan imager is used to determine the motion of a subject. Each line of image data from the line scan imager is compared with a reference image. The location of a matching line in the reference image reveals the displacement of the subject. The current subject displacement can be determined based on each line of image data. The resulting displacement information can be used to correctly place other optical beams on the subject. The method can be applied to tracking the human eye to facilitate measurement, imaging, or treatment with a beam of optical radiation.

A display device including a current drive circuit capable of stably and correctly supplying an intended current to a light emitting element of each pixel without being affected by variations in characteristics of an active element inside the pixel and as a result capable of displaying a high quality image, wherein each pixel comprises a receiving use transistor TFT3 for fetching a signal current Iw from a data line DATA when a scanning line SCAN-A is selected, a conversion use transistor TFT1 for once converting a current level of a fetched signal current Iw to a voltage level and holding the same, and a drive use transistor TFT2 for passing a drive current having a current level in accordance with the held voltage level through a light emitting element OLED. The conversion use thin film transistor TFT1 generates a converted voltage level at its own gate by passing the signal current Iw fetched by the TFT3 through its own channel. A capacitor C holds the voltage level created at the gate of the TFT1. The TFT2 passes the drive current having a current level in accordance with the held voltage level through the light emitting element OLED.

The invention relates to a method for automatic inspection of the surface 20 of a moving object, in which a region on the object's surface is illuminated from at least two different illumination directions 13-15. The object's illuminated surface region is imaged with a camera to provide image information for analysis. The light sources in the different illumination directions 13-15 are pulsed to illuminate the object's surface region at different times, the pulsing frequency being >1 kHz The object's illuminated surface region is imaged as lines with a line scan camera 21 in sync with the above pulsing. The invention also relates to an arrangement for inspecting the surface 20 of a moving object, the arrangement comprising at least two light sources 10-12 in at least two different illumination directions 13-15 for illuminating the surface region of the object under inspection; a camera for imaging the object's surface region; and an image analyzer for analyzing the image information acquired from the object's surface 20 by imaging. The light sources 10-12 illuminate the object's surface 20 from the different illumination directions 13-15 at different times, and the camera is a line scan camera 21. The arrangement further comprises a timing controller 18 for synchronous pulsing of the light sources 10-12 and the at least one line scan camera 21, the pulsing frequency of the light sources 10-12 being >1 kHz.

A system and method for sending a packet with a position address and line scan data from a first device over a 1394 interface to a second device. The present invention loads a camera, an illuminator, and a microprocessor with set-up instructions and a start pulse. The camera captures a line-by-line image of an object placed on the surface of a sliding prism. Position data, corresponding to the captured line-by-line image, is logged as the position address. The position address is combined with the line-by-line image to form a packet. The packet is sent to the second device for processing and viewing the image.

A polycrystalline film is prepared by (a) providing a substrate having a thin film disposed thereon, said film capable of laser-induced melting, (b) generating a sequence of laser pulses having a fluence that is sufficient to melt the film throughout its thickness in an irradiated region, each pulse forming a line beam having a predetermined length and width, said width sufficient to prevent nucleation of solids in a portion of the thin film that is irradiated by the laser pulse, (c) irradiating a first region of the film with a first laser pulse to form a first molten zone, said first molten zone demonstrating a variation in width along its length to thereby define a maximum width (W_max) and a minimum width (W_min), wherein the first molten zone crystallizes upon cooling to form one or more laterally grown crystals, (d) laterally moving the film in the direction of lateral growth a distance that is greater than about one-half W_max and less than W_min; and (e) irradiating a second region of the film with a second laser pulse to form a second molten zone having a shape that is substantially the same as the shape of the first molten zone, wherein the second molten zone crystallizes upon cooling to form one or more laterally grown crystals that are elongations of the one or more crystals in the first region.

Methods and apparatus are provided for computing focus information prior to scanning microscope slides with a line scan camera. The methods include a point-focus procedure that works by moving the slide to the desired measurement location, moving the objective lens through a predefined set of height values, acquiring imagery data at each height, and determining the height of maximum contrast. The methods also include a ribbon-focus procedure whereby imagery data are acquired continuously, while the slide and objective lens are in motion. Both methods may be applied with either a static or a dynamic implementation.

The invention relates to a method for measuring the volume of a large irregular bulk grain pile based on dynamic three-dimensional laser scanning. The method comprises the following steps of: arranging a guide rail in the middle of the top of a barn along the width direction, wherein the guide rail is provided with a slide block controlled by a stepping motor, and a laser radar scanner is installed on the slide block; moving the slide block from one end to the other end of the top of the barn at a constant speed to drive the laser radar scanner by the slide block to finish scanning on the surface of the whole bulk grain pile, wherein the laser radar device is a one-dimensional scanning device to realize linear scanning and returning coordinate data, and the master control computer is used for transmitting pulses to the stepping motor and processing the signal; acquiring point cloud data of the surface of the bulk grain pile through the master control computer, determining the distribution density of scanned points for calculating the volume according to an allowed error value of the grain pile measured by the user, and calculating the weight of the grain pile according to the grain density provided by the user; and generating a point cloud graphic matrix attached with coordinates through scanning space morphology by guide rail moving type three-dimensional laser, performing surface fitting to form an irregular bulk grain pile appearance, and thus obtaining the volume of the irregular bulk grain pile. The volume of the large irregular bulk grain pile can be rapidly and effectively measured at high precision, and remote monitoring can be realized; and moreover, the method is low in cost and easy to implement.

A system for performing high-speed, high-resolution imaging cytometry utilizes a line-scan sensor. A cell to be characterized is transported past a scan region. An optical system focuses an image of a portion of the scan region onto at least one linear light sensor, and repeated readings of light falling on the sensor are taken while a cell is transported though the scan region. The system may image cells directly, or may excite fluorescence in the cells and image the resulting light emitted from the cell by fluorescence. The system may provide a narrow band of illumination at the scan region. The system may include various filters and imaging optics that enable simultaneous multicolor fluorescence imaging cytometry. Multiple linear sensors may be provided, and images gathered by the individual sensors may be combined to construct an image having improved signal-to-noise characteristics.

The invention belongs to the technical field of tunnel detection of railway engineering systems and particularly relates to a method and a rail vehicle for full-section comprehensive detection of railway tunnels. The rail vehicle comprises a rail vehicle floor board, a cab and a carriage. Line-scan cameras are arranged on an arch frame which is arranged on the rail vehicle floor board, air-coupled shield antennas, and a GPS (global positioning system) mainframe, ground penetrating radar and infrared thermal imagers are arranged on the rail vehicle floor board. A GPS receiver is arranged at the top end of the cab, a laser scanner is arranged at the tail of the top plate of the carriage, and an industrial personal computer is arranged in the carriage. By multiple detection systems, one-time full-section detection of tunnel lining states and tunnel bottom damages can be realized, high detection accuracy, high efficiency, shortening of maintenance time and saving of maintenance cost are realized, influences on normal transportation of the railway tunnels are low, and loss caused by stopping of transportation is reduced.

The invention relates to a method using three-dimensional mechanics characteristics and tissue specific imaging of blood vessels and plaques for detection. The method is on the basis of a multi-beam focus wave and superfast plane wave alternative transmitting sequence and can also be extended to a line-by-line scan imaging manner; the forms and the functions of the blood vessels and the plaques are evaluated and imaged respectively from the aspects of the radial-direction, circumferential and axial-direction three-dimensional mechanics characteristics, blood vessel wall shear rate, plaque form and tissue characterization, and the like; the new method which is provided for detection of the vulnerable plaques of a carotid artery is regarded as the improvement of the existing method.

The invention relates to a system and method for a line scan confocal ophthalmoscope. The system comprises a linear light beam generation module, a splitting module, a scanning module, an imaging module and an output module. A linear light beam is subject to one-dimensional space scanning by the line scan confocal ophthalmoscope to illuminate fundus oculi retina, simultaneously a linear detector is used for image non-scan light beams reflected from the fundus oculi retina, the system only uses one scanning galvanometer and one linear detector, and the number of active members is small; and simultaneously, a confocal slit is conjugated with the plane of the fundus oculi retina, thereby eliminating the influence of eliminate stray light of a non-retina plane on imaging quality and obtaining high resolution by using the confocal imaging principle. The invention has the advantages of simple structure, short light path, good stability and high imaging frame frequency, is easy for manufacture and suitable for adjustment, and is small and exquisite.

The present invention provides a method for determining the physical fitness of documents such as bank notes. The method comprises passing a document past an image sensor while sequentially illuminating the document using multi-mode illumination, wherein a predetermined mode of illumination is used for each line scanned by the image sensor, producing an interleaved image of the document. A multi-dimensional transformation function is applied to this interleaved image to produce a composite measurement, which is then projected onto an empirically determined fitness vector to yield a scalar fitness value for the document. This value is compared against empirically prescribed fitness values to determine if the document is fit enough to remain in circulation or should be taken out of circulation and retired (destroyed).

An inspection system for inspecting a sheet of glass comprises an illumination module, a collimating lens system, a telecentric imaging lens system and a Time Delay Integration line-scan camera. The illumination module has a low coherence light source emitting light. The collimating lens system has a focal point on the main axis thereof on which focal point its light source is located. The collimating lens system produces a collimated sheet of light from the emitted light. This collimated sheet of light passes through the sheet of glass. The telecentric imaging lens system concentrates the sheet of light passed through the sheet of glass on an image formation plane. The Time Delay Integration line-scan camera is positioned in a general area of the image formation plane. The camera is equipped with an antiblooming device. In another embodiment, an inspection system for inspecting a sheet of glass comprises a camera and a peripheral RDF illumination module. The camera is positioned on and points toward a first side of the sheet of glass. The peripheral RDF illumination module surrounds the camera and side, outside a field of view of the camera. The RDF illumination module is operative to illuminate the field of view with its RDF emitted light. The RDF illumination module is oriented so that the sheet of glass reflects the RDF emitted light away from the camera. The camera is positioned so as to be operative to receive the RDF emitted light if a RDF detectable defect is present on the sheet of glass and to avoid the RDF emitted light if no RDF detectable defect is present on the sheet of glass.

The invention provides a contact network geometrical parameter detection method and device. The contact network geometrical parameter detection method comprises the steps of obtaining one-dimensional contact network images shot by at least two line-scan cameras fixed on the top of a vehicle, carrying out grey processing on the one-dimensional contact network images to generate a grey value and pixel coordinate relation diagram, determining the imaging position of contact lines of a contact network in the images according to the grey value and pixel coordinate relation diagram, determining the imaging angle of each contact line in the corresponding camera according to the imaging position of the contact line, and determining the geometrical parameters of the contact network according to the imaging angles and the position data of the line-scan cameras relative to the top of the vehicle. Geometrical parameter detection is carried out by utilization of the images collected by the line-scan cameras, the line-scan speed is high, a detection result is accurate, detection efficiency is high, the time for maintaining a skylight is not occupied, a reliable technical means is provided for measurement and evaluation of dynamic and static geometrical parameters of the contact network, and the working efficiency for checking and maintaining a power supply unit is improved.

The mobile data collection system includes a positioning system, such as a Global Positioning System (GPS) receiver and/or an Inertial Navigation System (INS), to generate position and time data. A down looking line scan camera for mounting on a vehicle, obtains a series of line scan images of a path, such as a road. A data collection controller is connected to the positioning system and the line scan camera to associate the line scan images with the corresponding position and time data. A database stores the line scan images and associated corresponding position and time data. An image processor identifies and marks features in the line scan images.

The invention relates to a method for detecting and classifying glass defects based on machine vision. The method comprises the following steps of: extracting a defect area in a picture provided by a camera (linear scanning) by Canny edge detection to obtain a minimum connected domain of the defects; processing a target area according to a filter and a W characteristic which are provided by the method; defining nine kinds of characteristic modes, scanning the minimum connected domain according to rows and columns, and counting the emerging frequency of the nine kinds of characteristic modes in a sample; and judging the types of the defects (bubbles are used as hollow defects, and impurities are used as solid defects) on the basis of the emerging frequency. Compared with the prior art, themachine-vision-based method has the advantages of simple algorithm, quick operation speed, high accuracy and the like, and a new reliable method is provided for the detection of the glass defects.