Tutorial_Coded_Light_Projection

Experiments

Introduction

Classification

Time-multiplexing

Spatial codification

Direct codification

Direct Codification

•Every encoded pixel is identified by its own intensity/colour

•Since the codification is usually condensed in a unique pattern, the spectrum of intensities/colours used is very large

•Additional reference patterns must be projected in order to differentiate among all the projected intensities/colours:

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•Ambient lighting (black pattern)

•Full illuminated (white pattern)

•…

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•Advantages:

–Reduced number of patterns

–High resolution can be in theory achieved (all points are coded)

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•Drawbacks:

–Very noisy in front of reflective properties of the objects, non-linearities in the camera spectral response and projector spectrum Þ non-standard light emitters are required in order to project single wave-lengths

–Low accuracy (order of 1 mm)

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Conclusions