A single method and apparatus for producing many of the most common types
of hologram from digital data is disclosed. In one embodiment the data
are generated entirely by a computer as a 3-D (animated) model. In
another embodiment the data are generated from multiple 2-D camera images
taken of a real 3-D (moving) object or scene from a plurality of
different camera positions. The data are digitally processed and
displayed on a small high resolution spatial light modulator (SLM). A
compact low energy pulsed laser, which avoids the usual vibration
problems encountered at high rates of production and the installation in
normal working environments, is used to record composite holograms on an
holographic emulsion using a special optical design. The present
invention permits the creation of restricted or full parallax master
transmission or reflection type composite holograms, known as H1
holograms, that can be copied using traditional methods to produce full
or single color rainbow white-light transmission holograms, achromatic
white-light transmission holograms or single or full-color white-light
reflection holograms. Alternatively the same invention and apparatus
permits the direct writing of full or single color rainbow white-light
transmission composite holograms, achromatic white-light transmission
composite holograms or single or full-color white-light reflection
composite holograms without the need to pass through the intermediate
stage of the H1 transmission hologram. The present invention allows the
creation of a compact rugged machine that is capable of producing
holograms covering a large size range. In addition the invention produces
holograms that can be tiled together to form composite holograms much
larger than the component panels.