Nintendo wii 3 d ir sensor phd thesis introduction

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A structured-light 3D scanner is a 3D scanning device for measuring the three-dimensional shape of an object using projected light patterns and a camera thesis introduction. Projecting a narrow band of light onto a three-dimensionally shaped surface produces a line of illumination that nintendo wii 3 d ir sensor phd thesis introduction distorted from other perspectives than sensor phd of the projector, and can be used for geometric reconstruction of nintendo wii surface shape light section.

Davide Scaramuzza

A faster and more versatile method is the projection of patterns consisting of many stripes at once, or of arbitrary fringes, as this allows for the acquisition nintendo wii wii a multitude of samples simultaneously.

Seen from different viewpoints, the pattern appears geometrically distorted due to the surface shape of phd thesis object. Although many other variants of structured light projection are possible, patterns of parallel stripes are widely used. The picture shows the geometrical deformation of a single stripe projected onto a simple 3D surface.

The displacement of the stripes allows for nintendo wii 3 d ir sensor phd thesis introduction exact retrieval of sensor thesis introduction coordinates of introduction details on the object's surface. Two major methods of stripe pattern generation have introduction established: Laser interference and projection.

3D scanning

The laser interference method works with two wide planar laser beam fronts. Their interference results in regular, equidistant line patterns.

Nintendo wii 3 d ir sensor phd thesis introduction pattern sizes can be obtained by changing the angle between these beams. The method allows for the exact and easy generation of very fine patterns with unlimited click here of field.

Disadvantages are essay writing scientific topics for cost of implementation, difficulties providing the ideal beam geometry, and laser typical effects like speckle noise and the possible self interference with beam parts reflected from objects.

Typically, there is no means of modulating individual stripes, such as with Gray codes. The projection method uses incoherent light and basically works like a video projector. Patterns are usually generated by passing light through a digital spatial light modulatortypically nintendo wii on one of the three currently most widespread digital projection technologies, transmissive liquid crystalreflective liquid crystal on silicon LCOS or digital light processing DLP; moving micro mirror modulators, which sensor phd various comparative advantages and disadvantages for this application.

Other methods of projection could be and have been used, thesis introduction. Patterns generated by thesis introduction display projectors have small discontinuities due to the pixel boundaries in the displays.

Davide Scaramuzza

Sufficiently small boundaries however can practically be neglected as they nintendo wii 3 d ir sensor phd thesis introduction evened out by nintendo wii 3 d ir sensor phd thesis introduction slightest defocus. A typical measuring assembly consists of one projector and at least one camera.

For many applications, two cameras on opposite sides of the projector have been established as useful. Invisible or imperceptible structured light uses structured light without interfering with other computer vision tasks nintendo wii 3 d ir sensor phd thesis introduction which the projected pattern will be confusing.

Example methods include the use of infrared light or of extremely high framerates alternating between two exact opposite patterns. Geometric distortions by optics and perspective must be compensated by a calibration of the measuring equipment, using special calibration patterns and surfaces. A mathematical model is used for describing the imaging properties of projector sensor phd cameras.

Nintendo wii 3-d ir sensor phd thesis

Essentially based on the simple geometric properties of a pinhole camerathe model also has to take into account the geometric distortions and optical aberration of projector and camera lenses. The parameters of the camera as well as its orientation in space can be determined by a series of calibration measurements, using photogrammetric bundle adjustment.

There are several depth cues contained in the observed stripe patterns. The displacement of any single nintendo wii 3 d ir sensor phd thesis introduction can directly be converted into 3D coordinates.

Nintendo wii 3-d ir sensor phd thesis - on the site -

For this purpose, the individual stripe has to be identified, which can for example be accomplished by tracing or counting stripes pattern recognition method. Another common nintendo wii 3 d ir sensor phd thesis introduction projects alternating dna essay outline patterns, resulting nintendo wii 3 d ir sensor phd thesis introduction binary Gray code sequences identifying the number of each individual stripe hitting the college writing cause and effect essay. An important depth cue also results from the varying stripe widths along the object surface.

Stripe width is a function of the steepness of a surface part, i. Stripe frequency and phase deliver similar cues and can be analyzed by a Fourier transform. Finally, the wavelet transform has recently been discussed for the same purpose. In many practical implementations, series of measurements combining pattern recognition, Gray codes and Fourier transform are obtained for a complete and unambiguous reconstruction of shapes.

Another method also belonging to the area of fringe nintendo wii 3 d ir sensor phd thesis introduction has been demonstrated, utilizing the depth of field of the camera.

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