Re: David Laser Scanner Keygen Torrent -
Ashlie Hagenson
DAVID Laserscanner is a software package for low-cost 3D laser scanning. It allows scanning and digitizing of three-dimensional objects using a camera (e.g. a web cam), a hand-held line laser (i.e. one that projects a line, not just a point), and two plain boards in the background. The software generates 3D data in real time and shows them on the computer screen while the laser line is swept over the object by hand (like a virtual brush). The line may be swept over the object multiple times, until the results are satisfactory.
The resulting 3D mesh can be exported into well-known file formats and can thus be imported and processed in most 3D applications. The software is also able to grab the texture and "stitch together" scans made from different viewing directions.
An initial calibration is made to determine the lens parameters and location of the camera relative to the background boards, which are two vertical planes positioned at 90 degrees to one another behind the object to be scanned. When scanning, the camera must be able to see part of the laser line on each board. This enables the software to reconstruct the plane of the projected laser light. Once it has determined the two-dimensional plane that the line laser is projecting, it is able to analyse the image of the laser line falling on the scanned object and resolve it into points in space.
Development of DAVID Laserscanner started in September 2006 by German computer scientists Dr. Simon Winkelbach and Sven Molkenstruck, research associates of the Institute for Robotics and Process Control of the TU Braunschweig. The concept has been published as a research paper[1] and has received the Best Paper Award at the German Association for Pattern Recognition (DAGM) on September 14, 2006, in Berlin.
This package contains everything you need to set up your own 3D scanner. Just hold the laser in your hand and sweep the laser line over the object you wish to scan: a sculpture, a face, anything at all. DAVID LASERSCANNER will immediately generate a 3D model in your PC, capturing even fine surface details of less than 0.2 millimetre.
Simply scan all sides of the object separately, including top and bottom. The software will automatically align and fuse all scans to create a textured all-round model!
The results may be stored and used in various standard 3D file formats (OBJ, STL, PLY), e.g. for computer animations, games, virtual 3D environments, product presentations, works of art, archaeology... The limits are set only by your imagination!
3-D modelling is maturing fast. Increasingly affordable solutions are not only raising general awareness of 3D workflows but revolutionizing design, engineering and manufacturing processes. The case in point is German-based David-laserscanner - a system that lets users turn everyday objects into 3D models at a low cost.
David-laserscanner currently offers two types of scanning units. The first uses a laser pen, (usually but not exclusively) a web camera, and a back board setup with known points on each facade. The points appear behind the object and are recognized by the software as part of the scanning process.
The second system uses the same type of camera (with plain board used for calibration only) and a projector, which projects a pattern on the surface of the object scanned. It is this process - known as structured light scanning - which enables the software to recognize the shape of the surface via the pattern projected on it. The iPhone app, Trimensional - a development stemming from Georgia Institute of Technology - uses the same principle in its 3D workflow.
The video below from Tinkernut.com demonstrates how to build your own laser scanner and use the free software offered by David. In the example highlighted, the figure of a robot is captured using the free version of the software and additional processing is done in Blender - an open source 3D modelling package. More information on the latter, along with downloads of the modelling package, can be found at Blender.org.
Der David-Laserscanner ist ein Softwarepaket, mit dessen Hilfe sich ohne spezielle Hardware Laserscanning betreiben lsst, also dreidimensionale Modelle von Objekten erfasst werden knnen. Auer der Software und einem Windows-PC werden lediglich ein Linienlaser und eine Webcam bentigt.
Vor dem eigentlichen Scanvorgang ist eine Kalibrierung erforderlich. Dazu bringt man ausgedruckte Messpunkte auf zwei rechtwinklig zueinander stehenden Platten auf, die dann von der Webcam erfasst werden. Durch die bekannte Lage der Messpunkte im Raum gewinnt man so eine bijektive Funktion zwischen den Pixelkoordinaten der Kamera und 3D-Punkten auf der Oberflche des Kalibrierungsobjektes. Auerdem wird das Programm auf die Lichtverhltnisse eingestellt.
Beim eigentlichen Scanvorgang wird das aufzunehmende Objekt zwischen die beiden Kalibrierungsflchen gestellt und frei Hand mit der Laserlinie abgetastet. Dabei wird die Linie durch die Kamera erfasst, und zwar gleichzeitig auf beiden Kalibrierflchen und auf dem gescannten Objekt. Mithilfe der zuvor gewonnenen Funktion kann nun fr jedes Einzelbild die Lage des Lasers im Raum bestimmt werden und damit auch die Lage der vom Laser beleuchteten Punkte auf der Oberflche des gescannten Objektes.
Die 3D-Daten werden unmittelbar auf dem Monitor angezeigt. Die Abtastung kann so lange fortgesetzt werden, bis die Dichte der gewonnenen Daten zufriedenstellend ist. Das erzeugte 3D-Modell kann in verschiedene Dateiformate exportiert und mit beliebigen CAD- und 3D-Programmen weiterverarbeitet werden.
Die Entwicklung des David-Laserscanners begann im September 2006 durch Simon Winkelbach und Sven Molkenstruck, wissenschaftliche Mitarbeiter am Institut fr Robotik und Prozessinformatik an der TU Braunschweig. Das Konzept wurde als wissenschaftliche Verffentlichung publiziert[1] und gewann im September 2006 den DAGM-Hauptpreis der Deutschen Arbeitsgemeinschaft fr Mustererkennung[2].
The scanner could be done a number of ways.
One way would be to angle a laser so that it reflects a line onto the object and sensors detect the intensity of the light while the object rotates.
Another way would be to surround the entire working space with an laser diode matrix each side could be scanned while the opposing side emits light.
For metal objects, one thing you could do is use the method used in the Roland Modela Desktop CNC machines for calibrating the tool height. It works like a simple closed / open circuit : a current passes in the tool and the object, whenever the tool touches the objects, it closes the circuit. This way, you can have your tool move on a grid, and make it go down slowly at each intersection of the grid. Whenever you touch the object, you have an X/Y/Z coordinate, and with a fine enough grid, can reconstruct a relatively accurate object.
I have a touch probe at home (stole it in high school, those thing are damn expensive ^^), but I was unable to find any info on the pinout and how this works, but I think this might be the best solution.
Edit: it appears the Roland scanners use a touch-probe to achieve this. Considering the low-cost of their units, this might be a viable method for a do-it-yourself-er (The laser-based units all seem to cost a lot of money =)
Basically, you hold print out a calibrating sheet and point a webcam at the scene. Place something in front of the calibrator and shine a laser line over the object then rotate it every 15 degrees or so.
Si vous disposez d'ouvrages ou d'articles de rfrence ou si vous connaissez des sites web de qualit traitant du thme abord ici, merci de complter l'article en donnant les rfrences utiles sa vrifiabilit et en les liant la section Notes et rfrences .
David-Laserscanner est un logiciel pour le scan 3D avec un laser. Il est disponible gratuitement et sous licence. Il permet de scanner et de numriser des objets en 3 dimensions l'aide d'une camra (exemple : webcam), un laser ligne (diffrent du laser point)[Quoi ?] et deux plans de calibration derrire. Le laser peut tre tenu la main pour obtenir le rsultat alors que David-Laserscanner gnre en temps rel le modle 3D et l'affiche l'cran. Le modle 3D obtenu peut tre export en fichiers standard (.obj)[Quoi ?]. Le logiciel est aussi capable de capturer la texture et de l'appliquer sur le modle 3D. La version complte permet d'aligner et de fusionner les diffrents scans capturs depuis des directions diffrentes.
Les dernires versions du logiciel permettent de scanner en lumire structure : Scanner 3D lumire structure. Il faut alors disposer d'un vidoprojecteur (ou quivalent) pour projeter les franges sur l'objet scanner.
The starter-kit supplied by A1 Technologies comprises a high resolutiontwo-megapixel webcam with autofocus; a red line laser module (650 nm, Class 1laser) with adjustable focus, including battery; calibration panels (for threedifferent object sizes); a base plate for mounting the calibration panels;DAVID-laserscanner Professional Edition software on a USB Flash Drive; a standfor the webcam; and a full user manual.
Easy to use, the DAVID-laserscanner is capable of producing 3D data that canbe used in various standard file formats. To obtain the required data userssimply hold the laser in their hand and sweep the laser line over the object tobe scanned. The DAVID-laserscanner will immediately generate a 3D model in yourPC, capturing even fine surface details of less than 0.2 mm. Simply scan allsides of the object separately, including the top and bottom. WithDAVID-Shapefusion it is possible to merge multiple scans that were made fromdifferent sensor directions in order to get a complete, textured 360model. The data generated can be used for a host of applications including:product design, computer animations, games, virtual 3D environments, productpresentations, works of art, and archaeology. The potential is limitless.
For any company that is considering 3D laser scanning as an enablingtechnology for its business development, the DAVID-laserscanner is an idealchoice. Priced at just 320 for the entire starter kit the investment iseasy to justify and will bring with it great rewards and real insight into thecapabilities of this technology.
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