Barco Thor Series, Installation Manual

Page: 175 / 182

R5906788-03 Thor series 175
Digital Cinema Package (DCP)
A Digital Cinema Package (DCP) is a collection of digital files used to store and convey Digital Cinema (DC)
audio, image, and data streams. The term has been defined by Digital Cinema Initiatives (DCI). General
practice adopts a file structure that is organized into a number of usually multi-gigabyte size Material
eXchange Format (MXF) files, which are separately used to store audio and video streams, and auxiliary
index files in XML format. The MXF files contain streams that are compressed, encoded, and encrypted, in
order to reduce the huge amount of required storage and to protect from unauthorized use. The image part is
JPEG 2000 compressed, whereas the audio part is linear PCM. The adopted (optional) encryption standard is
AES 128 bit in CBC mode. The newer SMPTE standards are used to conform the recommendations among
different tool vendors and producers. Interop, the legacy DCP standard, is still required to be supported by
DCP players.
Digital Cinema Initiatives (DCI)
DCI is a joint venture of Disney, Fox, Paramount, Sony Pictures Entertainment, Universal and Warner Bros.
Studios. DCI's primary purpose is to establish and document voluntary specifications for an open architecture
for digital cinema that ensures a uniform and high level of technical performance, reliability and quality control.
Note that the DCI specification is not a standard. Standards for digital cinema are the domain of the Society of
Motion Picture and Television Engineers (SMPTE). "DCI compliant" is a term used to describe products that
conform to the DCI specification. Products that have been tested per the DCI Compliance Test Plan (CTP) are
posted at the DCI compliance web site. Notably, DCI compliance does not require compliance to the full set of
SMPTE DCP standards. A copy of the most recent DCI specification can be downloaded from the DCI website
(
http://dcimovies.com ).
Scheimpflug principle
The "plane of sharp focus" can be changed so that any plane can be brought into sharp focus. When the DMD
plane and lens plane are parallel, the plane of sharp focus will also be parallel to these two planes. If, however,
the lens plane is tilted with respect to the DMD plane, the plane of sharp focus will also be tilted according to
geometrical and optical properties. The DMD plane, the principal lens plane and the sharp focus plane will
intersect in a line below the projector for downward lens tilt.
Scheimpflug principle
The "plane of sharp focus" can be changed so that any plane can be brought into sharp focus. When the DMD
plane and lens plane are parallel, the plane of sharp focus will also be parallel to these two planes. If, however,
the lens plane is tilted with respect to the DMD plane, the plane of sharp focus will also be tilted according to
geometrical and optical properties. The DMD plane, the principal lens plane and the sharp focus plane will
intersect in a line below the projector for downward lens tilt.
Screen Brightness
Screen Brightness, or how bright a screen will look, involves measuring the light reflected from its surface to
our eyes. It takes into account the luminous flux (lumens) falling over its entire area (lux) and how reflective
the surface of the screen is. It literally is a measure of the light bouncing off the screen. Luminance is
measured in foot-lamberts. One foot-Lambert of luminance is equal to one lumen per square foot.