摘要:
System for processing digital images includes a system of n fixed real cameras whose individual fields of view merge for recording a panoramic scene. An image construction system simulates a mobile, virtual camera continuously scanning the panoramic scene (Iv) to furnish an arbitrary sub-image, referred to as a digital target image (Iv) constructed from adjacent source images of the real cameras. A luminance equalizing system includes modules which apply correction laws (Gi, Gj), respectively, to the sets (R and F(R)) of the corresponding luminance levels, in portions (Ivi, Ivj) of a digital target image (Iv) constructed from two adjacent digital source images (Ii, Ij) to equalize these corresponding levels in accordance with the relation Gi(R)=Gj[F(R)].
摘要:
Method of processing a digital image in order to construct a calculated image, termed the target image (I*), which represents a so-called source image (I) reconstructed with modifications to the tilting angle, panning angle and scale factor in relation to this source image, including the determination of a common view point (P) for the source image (I) and the target image (I*), and of an orthonormal reference frame; the definition of an image (H*) termed the projection of the target image (I*), with geometrical center (.OMEGA..sub.H *) aligned with the optical axis (PZ*) of the target image, with zero tilting angle, with the same panning angle (.THETA.*) and the same framing (2V.sub.x*, 2V.sub.y *) as the target image (I*) so that every pixel (M*) with address (X*, Y*) in the target image (I*) has a counterpart under projection (M.sub.H *) with the same address (X*, Y*) in the projection image (H*); the calculation by a trigonometric function (G.sup.-1), for every pixel (M*) with address (X*, Y*) in the target image, of the spherical coordinates (.alpha., .beta.) defining, in the reference frame, the ray linking the origin (P) to the corresponding pixel (M.sub.H *) of (H*).
摘要:
A method of processing a digital image in order to construct a calculated image, termed the target image (I*), which represents a so-called source image (I) reconstructed with modifications to the tilting angle, panning angle and scale factor in relation to this source image. This method includes determining a common view point (P), for the source image (I) and the target image (I*), as the origin of an orthonormal reference frame; and calculating, for every pixel (M*) with address (X*, Y*) in the target image (I*), spherical coordinates (.alpha., .beta.) by a linear function G.sup.-1 such that (.alpha., .beta.)=G.sup.-1 (X*Y*), the coefficients being functions of the modified tilting and panning angles and scale factor. Finally, the method includes reading a pair (X, Y) which is stored in a table and which constitutes the address of a point (M), in the source image (I), corresponding to the pixel (M*) in the target image (I*), by the matching, to the resolution of the table, the spherical coordinates (.alpha., .beta.) with one of the addresses (.alpha..sub.o, .beta..sub.o) of the table.
摘要:
The present invention relates to a device 10 for automatically identifying a part 20a, 20b of an anatomy structure comprising several parts 20a, 20b, in which anatomy structure an intervention device 21 resides. The device 10 comprises a feature extraction unit 11 and an anatomy part classification unit 13. The feature extraction unit 11 uses provided image content data ICD to extract at least one characterizing feature DS of the appearance of 10 the intervention device 21. The anatomy part classification unit 13 correlates the at least one characterizing feature DS with provided classifier data CD which are characteristic for a projection feature of the intervention device 21 viewed under certain geometry of an imaging system 30. After correlating, the anatomy part classification unit 13 determines in which part 20a, 20b of the anatomy structure comprising several parts 20a, 20b the intervention device 2115 is located.
摘要:
The present invention relates to annotating a medical image. For an improved manual insertion of information in a medical image, it is provided to display an image (130) of a tubular structure; and to display a graphical representation (132) of at least one segmented portion of the tubular structure; wherein the graphical representation comprises at least one indicator line representing the portion's shape and/or extension; and wherein the graphical representation is displayed in combination with the image of the tubular structure; and to generate and display at least one marker (128) overlaid to the image of the tubular structure; wherein the marker is movable (134) along the graphical representation; and to position the marker at a location along the graphical representation to indicate a predetermined feature of the tubular structure.
摘要:
An apparatus and a related method of processing a 2D projection image (110a-b) taken of a tubular structure comprising two or more tubes. One of the tubes branches off from the other at a sidewall opening. The apparatus is configured to estimate a position of the sidewall opening. The estimation is based on a segmentation of the one or more projection images. A marker for the estimated position of the sidewall opening can be displayed overlaid on the projection image.
摘要:
The invention relates to a method and an apparatus for providing device sizing support, the method comprising obtaining an X-ray image of a vessel, introducing a guide wire having a radiopaque wire tip into the vessel, obtaining an X-ray image of the wire tip, segmenting the wire tip when it passes through the vessel, and providing sizing information relating to the size of the vessel based on the size of the wire tip. The imaging system according to the invention includes means providing functionality for performing the method according to the invention.
摘要:
The invention relates to adaptive roadmapping providing improved information to the user, comprising the following steps: providing pre-navigation image data representing at least a part of a vascular structure comprising a tree-like structure with a plurality of sub-trees; generating a vessel representation on the basis of pre-navigation image data; acquiring live image data of the object, which object comprises the vascular structure; wherein the vascular structure contains an element of interest; determining spatial relation of the pre-navigation image data and the live image data; analysing the live image data by identifying and localizing the element in the live image data; determining a sub-tree in which the element is positioned, wherein the determining is based on the localization of the element and on the spatial relation; and selecting a portion of the vascular structure based on the determined sub-tree; generating a combination of the live image data and an image of the selected portion of the vascular structure; and displaying the combination as a tailored roadmap. The element may be physical object, for example an interventional tool or device.
摘要:
A method for dynamically visualizing coronary information and an apparatus adapted to implement such method is described. In a preferred embodiment of the method, first dynamic cardiac data is acquired during a first cardiac stage and second dynamic cardiac data is acquired during a second cardiac stage. Then, the two data sets are visualized continuously the in a superimposed presentation, wherein the first cardiac data and the second cardiac data corresponding to a same phase within the cardiac cycle are visualized simultaneously. In this way for example information about the vessel geometry may be immediately linked with information about the muscle irrigation or perfusion. Furthermore, this useful information may be displayed in a high-contrasted and low-noise presentation.
摘要:
The invention relates to a system and a method for producing an image of a physical object and to a computer program element and a computer readable medium. In order to provide improved stent boost subtract also showing wire state information, a system and a method are provided, the method comprising the following steps: a) tracking a predetermined first feature (126) and a predetermined second feature (128) in a first plurality (114) of first images (116), which images reveal a first criterion (118); and determining a first feature transform; and determining second feature distortion vector fields relative to the first feature transform; b) associating and recording second feature distortion vector fields corresponding to at least two phase attributes (120); c) tracking the predetermined first feature (126) in at least one secondary image (142) which image reveals a second criterion; d) determining a first-feature-based inter-criterion the first-feature-based inter-phase transform and the second feature distortion vector fields corresponding to a matching phase attribute (120); and f) generating a combined inter-criterion image (162) based on the restored physical distortion.