239 results about "Projection View" patented technology

A light weight compact portable GPS receiver and transmitter for use on the person during outdoor activity, data logging receiver, data logging software supported by battery pack and modified active GPS patch antenna with chips, download connector, download docking station, charging units, mapping software to transfer the GPS data onto various maps including ortho-rectified, flat topographical maps, 3-D projection view topographical maps and street maps.

Certain embodiments of the present invention provide a method and system for improved tracking of an internal object, such as an implant or part of the anatomy, during an image-guided operation. In an embodiment, the method may include obtaining a plurality of fiducials for an internal object from a plurality of projection views, obtaining a plurality of measurements for the internal object using the plurality of fiducials, forming a three-dimensional model of the internal object using the plurality of measurements from a plurality of projection views for use in tracking the internal object, and performing an image-guided operation using an image data set and a three-dimensional representation of the internal object. The fiducials may be indentations, curves, grooves and/or identifying features in the internal object. In an embodiment, the representation of the internal object is compared to a computer-generated model of the internal object.

Two-dimensional or three-dimensional, time-resolved CT frame images are acquired during a dynamic study of a subject. A composite image is produced and this is used to reconstruct each CT frame image by weighting the backprojection of each projection view acquired for that image frame by the corresponding value in the composite image. This weighted backprojection enables artifact-free image frames to be produced with far fewer projection views of the subject. The composite image may be reconstructed from views acquired separately, or it may be produced by combining views acquired during the course of the dynamic study.

A method and system for converting low-dose tomosynthesis projection images or reconstructed slices images with noise into higher quality, less noise, higher-dose-like tomosynthesis reconstructed slices, using of a trainable nonlinear regression (TNR) model with a patch-input-pixel-output scheme called a pixel-based TNR (PTNR). An image patch is extracted from an input raw projection views (images) of a breast acquired at a reduced x-ray radiation dose (lower-dose), and pixel values in the patch are entered into the PTNR as input. The output of the PTNR is a single pixel that corresponds to a center pixel of the input image patch. The PTNR is trained with matched pairs of raw projection views (images together with corresponding desired x-ray radiation dose raw projection views (images) (higher-dose). Through the training, the PTNR learns to convert low-dose raw projection images to high-dose-like raw projection images. Once trained, the trained PTNR does not require the higher-dose raw projection images anymore. When a new reduced x-ray radiation dose (low dose) raw projection images is entered, the trained PTNR outputs a pixel value similar to its desired pixel value, in other words, it outputs high-dose-like raw projection images where noise and artifacts due to low radiation dose are substantially reduced, i.e., a higher image quality. Then, from the “high-dose-like” projection views (images), “high-dose-like” 3D tomosynthesis slices are reconstructed by using a tomosynthesis reconstruction algorithm. With the “virtual high-dose” tomosynthesis reconstruction slices, the detectability of lesions and clinically important findings such as masses and microcalcifications can be improved.

The present invention relates to an apparatus for aiding operation of an interventional x-ray imager during image acquisition, to a method of aiding operation of an x-ray imager, to an interventional x-ray imager, to a computer program element and to a computer readable medium. The X-ray imager is capable of varying X-ray dosages depending on differences in X-ray attenuation levels across an object of interest to be imaged and is capable of assuming any one of a plurality of imaging geometry positions when acquiring an image. An indication, visual, acoustic or haptic, to the operator of an X-ray imager is provided on the incurred change in X-ray dosage when changing from a current projection view to an updated projection view, provided that a given constant image quality is to be maintained throughout the different views.

A method and system for an improved data acquisition system with an image detector array and an image processing system which finds a malfunctioning cell, interpolates a signal for the malfunctioning cell using neighboring channels of the cell, and corrects the interpolation with an error rate found in performing interpolations on neighboring rows with cells which are not malfunctioning. The image processing system may include a DAS and a reconstruction system. The step of finding a malfunctioning cell may be accomplished through a variety of methods, such as measuring discrepancies between a cell's and its neighboring cell's average readings over time and exposing the cells to x-rays which should produce similar readings in all the cells and comparing the cells' signals, looking for discrepancies. The step of interpolating and the step of correcting may take into consideration cells within the same projection view as the malfunctioning cell.

The present invention relates to a sunlight readable computing device, especially, to a full color direct-view and projection-view computing device. When the computing device works in the direct-view mode, the display panel tilt up to the conventional display position and it has a wide, open viewing angle; when the computing device works in the projection view mode, the display panel tilt down and forms a projection image via a mirror plate with a sufficient high contrast ratio and superior readability even directly under sunshine. The solar ambient light can be utilized as the lighting source in both direct-view and projection-view display modes, thus remarkably reduces the power consumption and substantially prolongs the operation time of the computing device.

Some configurations of the present invention thus provide a method for producing images of an object. The method includes dynamically helically scanning an object on a moving table utilizing a scanning imaging system. During the scan, projection views of the object are acquired and stored together with corresponding table locations. A plane for reconstruction of an image of the object is selected. The stored table locations are used to determine geometric variables applicable to the stored projection views; and the stored projection views are filtered and backprojected utilizing the geometrical variables to reconstruct an image of the object at the reconstruction plane.

The invention discloses a method for translating dimensions on a two-dimensional engineering drawing to a three-dimensional CAD (computer aided design) model. The method is used for solving a technical problem that a three-dimensional CAD model dimension marking method in prior art is low in efficiency. The technical scheme of the method is as follows: projecting the three-dimensional CAD model to obtain a projection view of the three-dimensional CAD model; then respectively extracting pixel information of the projection view and the two-dimensional engineering drawing, and respectively representing the projection view and the two-dimensional engineering drawing in a spatial relation drawing structure with a pixel as an apex; and finally carrying out accurate pixel matching on two spatial relation drawings. A test result shows that the method can realize accurate pixel matching and can correctly realize dimension tolerance mapping from the two-dimensional engineering drawing to the three-dimensional model. By using the method, a high-efficiency and intelligent method is provided for a condition that the three-dimensional CAD model and the two-dimensional engineering drawing which are separate in prior arts are translated into a single model with three-dimensional dimension marks.

A method for recognizing the projection view of radiographs comprising the steps of correcting the orientation of the input radiograph, locating a region of interesting in the radiograph, recognizing the projection view of the radiograph.

A method for generating an image of an object is provided. The method comprises acquiring projection data at one or more projection views along a circular scan trajectory and generating a corrected projection dataset based upon a weighted derivative applied to a subset of the projection data. The method further comprises backprojecting the corrected projection dataset along one or more projection rays associated with one or more of the projection views, to generate a reconstructed image of the object.

A reconfigurable backlighting construction for use in portable computer-based systems having direct and projection viewing modes of operation is provided. These computer-based systems are capable of selectively displaying color video images on an actively driven display surface, or projecting such video images onto a wall surface or projection screen without the need for a bulky overhead projector, required by all prior art systems. These computer-based systems can be easily reconfigured for projection viewing without physical removal of the light guiding panel and its light diffusing structures. A portable light projection accessory device is also provided for use with the portable computer-based systems of the present invention. The portable light projection device has first and second housing portions that are interconnected by a foldable structure that permits the first and second housing portions to be selectively reconfigured for simple trouble-free use during the projection viewing mode of operation, and for compact storage during the direct viewing mode of operation.

A reconfigurable backlighting construction for use in portable computer-based systems having direct and projection viewing modes of operation. In the illustrative embodiments of the present invention, the backlighting construction is integrated with a LCD display panel, a micropolarization panel, and a touch-screen writing panel to provide several different types of portable computer-based systems including, for example, a portable notebook computer, a computer-driven image display device, and a portable pen-computing device. In general, each of these computer-based systems are capable of selectively displaying color video images on an actively driven display surface, or projecting such video images onto a wall surface or projection screen without the need for a bulky overhead projector, required by all prior art systems. These computer-based systems can be easily reconfigured for projection viewing without physical removal of the light guiding panel and its light diffusing structures. If desired, these computer-based systems can be used to directly view “spatially-multiplexed” images of 3-D objects or imagery during the direct viewing mode, and when desired these spatially-multiplexed images can be projected onto a wall surface or projection screen during the projection viewing mode. When the spatially-multiplexed images are viewed through electrically-passive polarized glasses, the 3-D object is perceived with stereoscopic depth sensation in either mode of viewing. A portable light projection accessory device is provided for use with the portable computer-based systems of the present invention. In the illustrative embodiments, the portable light projection device has first and second housing portions that are interconnected by a foldable structure that permits the first and second housing portions to be selectively reconfigured for simple trouble-free use during the projection viewing mode of operation, and for compact storage during the direct viewing mode of operation.

A method for determining a projection angle for use in tomographic imaging comprises obtaining projection data including at least one projection view from at least one projection angle. The at least one projection view is generated by scanning a test object with a tomographic imaging device. Each projection view comprises at least one observation value obtained at least one detection location, providing a plurality of candidate projection angles, for each candidate projection angle, calculating a function value indicative of an amount of information that may be gained by adding to the projection data a further projection view generated by scanning of the test object with the tomographic imaging device from the candidate projection angle, and selecting a candidate projection angle from the plurality of candidate projection angles taking into account the function values. A corresponding system and computer program product also is provided.

The present technique provides for the spectral calibration of the detector elements of a CT detector using one or more offset calibration phantoms. The offset phantoms provide greater coverage of the detector elements as well as spectral response data associated with penetration lengths ranging in length from a minimum chord of the phantom to the diameter of the phantom. The spectral response as a function of penetration length can be obtained for each detector element by comparing the fitting of each projection view to the corresponding measured projection view over all view angles. The fitting information may then be employed to derive the coefficients of the spectral response curve for each detector element, which may in turn be employed to provide rapid correction of the spectral response for each element.

The invention discloses a method for controlling a spraying gun of a spraying robot. The method comprises the steps of determining a plurality of surfaces of a workpiece, to be spayed according to a three-dimensional projection view; determining a spraying joint of each of the plurality of surfaces to be sprayed according to the spraying parameters and the three-dimensional projection view, and obtaining a two-dimensional point coordinate of the spraying joint; calculating a three-dimensional coordinate corresponding to the spraying joint of each surface according to the correspondence relation of the two-dimensional point coordinate of each view of the three-dimensional projection view; calculating a normal vector of each spraying joint according to the three-dimensional coordinate of each of the spraying joints and the three-dimensional coordinate of the joint adjacent to each joint; generating a spraying track of the spraying surface according to the three-dimensional coordinates of the spraying joints; performing spatial fit for the spraying track to obtain the fitted spraying track; calculating the spraying track and the normal vector of the spraying gun by the formula in the specification according to the fit track and the normal vector of the spraying joints.

The invention discloses an area array structure optical system-based three-dimensional reconstruction method and system. The method comprises the following steps that: the projection plane coordinatesof a projector in a projection coordinate system are obtained according to the physical coordinates of the projector and the calibration parameters of the projector; the first camera plane coordinates of a camera in a camera imaging coordinate system are obtained according to the physical coordinates of the camera and the calibration parameters of the camera, and the first camera plane coordinates are converted to the projection coordinate system, so that the second camera plane coordinates of the camera in the projection coordinate system can be obtained; the forward projection view and reverse projection view of an acquired image are obtained, and a target area is encoded according to the difference image of the forward projection view and the reverse projection view; the point cloud image of the target area is obtained according to the projection plane coordinates and the second camera plane coordinates, and a depth image is generated according to the point cloud image; and three-dimensional reconstruction is performed on a target object according to the point cloud image and the depth image. The method of the embodiments of the invention has the advantages of high precision and high efficiency of three-dimensional reconstruction.

Multiple sets of view channels originate from multiple projected views modulated through an optic assembly comprising a Fresnel lens, a vertical dispersion lenticular lens, and a diffuser. Compact projection enclosures are formed using image-repeating mirrors to create a three-dimensional autostereoscopic viewing experience in free space without the use of special eyeglasses and without the use of view screens. Multiple sets of images are repeated within a viewing zone that may extend well beyond the confines of the enclosure and may be projected through and beyond a glass window. An observer walking past the window will see one view channel per eye, due in part to the repeated images, and due in part to the vertical dispersion of each projected view. Separate images for each view channel may be created by using two or more cameras spaced apart at a distance interval to match the average horizontal distance between the eyes of a human observer. Multiple views or multiple sets of view channels may be generated and projected.