摘要:
Eine Vorrichtung zur Beobachtung von Objekten (1.7) und/oder Personen in einem Beobachtungsbereich (1.9), weist wenigstens einen Scheinwerfer (1.1) auf, der den Beobachtungsbereich (1.9) mit mindestens zwei verschiedenen für das menschliche Auge nicht sichtbaren Wellenlängen des Lichts zeitlich nacheinander ausleuchten. Wenigstens eine Kamera (1.5) erfasst die die von Objekten (1.7) und/oder Personen im Beobachtungsbereich (1.9) infolge der Ausleuchtung entstehenden Reflexionen nach den verschiedenen Wellenlängen zeitlich hintereinander pixelweise. Die Reflexionswerte je eines mit einer der verschiedenen Wellenlängen beleuchteten Bildes werden pixelweise in Bildspeichern abgespeichert. In einer Datenbank, in der bestimmte, den verschiedenen Wellenlängen zugeordnete Reflexionswerte gespeichert sind, ist den Reflexionswerten eine Farbe und/oder ein Helligkeitswert und/oder eine anderweitige optische Hervorhebung zugeordnet. Ein Monitor dient der Darstellung des von der Kamera (1.5) erfassten Beobachtungsbereichs (1.9). In einer Auswerteeinheit werden die die in den Bildspeichern abgespeicherten Reflexionswerte der Pixel mit den Reflexionswerten in der Datenbank verglichen, wobei dem jeweiligen Pixel zur Darstellung auf dem Monitor anhand des Vergleichs eine Farbe und/oder ein Helligkeitswert und/oder eine anderweitige optische Hervorhebung zugewiesen wird. Dadurch ist eine Identifizierung eines Objektes oder einer Person innerhalb einer Gruppe von Objekten oder Personen möglich, die im Dunkeln durch Scheinwerfer beleuchtet werden.
摘要:
A 3D modelling system is proposed in which an object is successively illuminated by at least one directional energy sources from at least three directions. The directional energy source(s) are controlled to emit energy at different respective intensities at different times. For each direction, at least one image of the object is captured at each of multiple corresponding light intensities. Images captured from the respective directions at first times are used in determining the corresponding intensities with which the object is illuminated from the respective directions at second times. The multiple images of the object for each direction provide high dynamic range data about the propensity of points on the object to reflect light propagating in the corresponding direction.
摘要:
Systems and methods for performing depth estimation may comprise: an illuminator capable of illuminating a scene from at least a first position and a second position, an image sensor to capture (i) a first image of the scene while the illuminator illuminates the scene from the first position and (ii) a second image of the scene while the illuminator illuminates the scene from the second position, and an image processor to receive the first and second images from the image sensor and estimate a depth of at least one feature that appears in the first and second images. The depth is estimated based on the relative intensity of the first image and the second image, a distance between the first illumination position and the second illumination position, and a position of the at least one feature within at least one of the first and second images.
摘要:
Die Erfindung betrifft ein Verfahren zur Aufnahme eines dreidimensionalen Abbilds einer, insbesondere statischen, Szene (3) mit - einer Vielzahl von Bildaufnahmeeinheiten (21, 22) mit gemeinsamem überlappendem Aufnahmebereich (200), sowie - einer Beleuchtungsanordnung, mit der eine Vielzahl von unterschiedlichen Lichtkonfigurationen zur Beleuchtung des gemeinsamen Aufnahmebereichs der Bildaufnahmeeinheiten (21, 22) erstellbar ist, - wobei mit jeder der Bildaufnahmeeinheiten (21, 22) jeweils zumindest ein Bild (411, 412, 413, 421, 422, 423) des gemeinsamen Aufnahmebereichs (200) für jeweils eine Anzahl der Lichtkonfigurationen erstellt wird, - wobei für jede Bildaufnahmeeinheit (21, 22) jeweils ein, gegebenenfalls mehrkanaliges, Merkmalsbild (51, 52) erstellt wird, indem die von dieser Bildaufnahmeeinheit (21, 22) erstellten Bilder (411, 412, 413; 421, 422, 423) nach einer vorgegebenen Funktion kombiniert werden, - wobei durch Korrespondenzanalyse für eine Anzahl von Referenzpunkten (611, 612, 613, 614), insbesondere für Punkte des überlappenden Aufnahmebereichs, in einem der Merkmalsbilder (51) jeweils der lageentsprechende Punkt (621, 622, 623, 624) in zumindest einem anderen Merkmalbild (52) ermittelt wird, und - wobei aufgrund der Disparität zwischen den miteinander korrespondierenden Punkte (611, 612, 613, 614; 621, 622, 623, 624) in den einzelnen Merkmalsbildern (51, 52) die dreidimensionale Lage des in den Punkten (611, 612, 613, 614; 621, 622, 623, 624) abgebildeten Raumpunkts ermittelt wird.
摘要:
A system (100) is provided for imaging a patient's interior. The system comprises an imaging sensor (120) for acquiring a series of images of a region of interest (020) in the patient's interior, and a plurality of light sources (140) for illuminating the region of interest in the patient's interior from different light source directions (152-156). A light controller (160) is provided for controlling individual ones (142-146) of the plurality of light sources (140) to dynamically vary the light source directions (152-156) during said acquiring. Moreover, a processor (180) is provided for obtaining lighting data (164) indicative of the dynamically varying light source directions. The processor (180) is further arranged for using the lighting data to apply a photometric stereo technique to the image data so as to establish a three-dimensional [3D] surface profile of the region of interest. The processor (180) is further provided to detect insufficiently illuminated areas of the region of interest (020-024) in the images acquired by the imaging sensor (120), using the 3D surface profile of the region of interest. Accordingly, the system is enabled to establish a 3D surface profile of the region of interest from a series of images in a convenient and cost-effective manner.
摘要:
A system and method for three-dimensional measurement of surfaces. In one embodiment, a measurement system includes a laser projector, a first camera, and a processor. The laser projector is configured to emit a laser projection onto a surface for laser triangulation. The first camera is configured to provide images of the surface, and is disposed at an oblique angle with respect to the laser projector. The processor is configured to apply photogrammetric processing to the images, to compute calibrations for laser triangulation based on a result of the photogrammetric processing, and to compute, based on the calibrations, coordinates of points of the surface illuminated by the laser projection via laser triangulation.
摘要:
Methods and systems for capturing motion and/or determining the shapes and positions of one or more objects in 3D space utilize cross-sections thereof. In various embodiments, images of the cross-sections are captured using at least one camera.
摘要:
The disclosure concerns processing of electronic images, such as hyperspectral, multispectral or trichromatic images. In particular, but is not limited to, a method, software and computer for estimating parameters of a reflectance model applied to an image is disclosed. Examples of processing of the images using the estimated parameters includes material recognition, recolouring and re-shading of objects represented in the image. That is, a computer implemented method is provided of estimating one or more of photogrammetric parameters, Ω( u ) surface shape N and index of refraction n ( u, λ) represented in a reflectance image having one or more known illumination directions L and a known viewing direction V , the method comprising optimising (802) the difference between the reflectance image and a reflectance model, the reflectance model being based on surface shape N ; the material index of refraction n ( u, λ) and a set of photogrammetric parameters Ω( u ) .
摘要:
The present invention relates to an optical device for imaging and measuring characteristics of an objects surface shape, surface spectral reflectance and structure of sub-surface layers. In particular, the invention relates to imaging of topography of human skin and skin sub-surface layers and determination of concentration of skin constituents. The present invention has applications in areas such as skin care, dermatology, cosmetics, wound management and tricology. The imaging device of the invention significantly improves photometric stereo measurements by suppressing specular reflection and allows accurate determination of the surface shape. Consequently the device allows elimination of the influence of the shape and illumination conditions on spectral measurements and allows accurate measurement of skin constituents.
摘要:
Disclosed are methods and apparatus for recovering the shape and appearance of an object illuminated by a coded structured light pattern that is observed by a camera, which simultaneously captures multiple views of the object. In one embodiment a Fresnel lens and a data projector are used as the means of illuminating the object with surrounding structured light patterns. The projector projects several patterns and the camera captures images of the object for each pattern. The images are decoded to determine the correspondence between projector scan-lines and camera pixels. Combined with the calibration of the relative position of the various optical elements, including the projector and camera, the ray-plane intersection is used to determine the three-dimensional depth for each part of the surface. An additional image captured under ambient illumination is used to recover the appearance for each surface point for each camera pixel.