A multi-temporal (sequential) binary coding uses black and white stripes to form a sequence of projection patterns for each point on the surface of the object. Binary coding technique is very reliable and less sensitive to the surface characteristics, since only binary values exist in all pixels. Thus, each pixel may be assigned a codeword consisting of its illumination value across the projected patterns. The respective patterns may, for instance, be based on binary codes or Gray codes and phase shifting. To achieve high spatial resolution, a large number of sequential patterns need to be projected. All objects in the scene have to remain static. The entire duration of 3D image acquisition may be longer than a practical 3D application allows for. These sensors are utilized in industrial environment.
Explain the principles of operation of the multi-temporal pattern based sensor
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