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8.
KEYKODE READER INSTALLATION
8.1.
OVERVIEW
KEYKODE READER INSTALLATION
Latent edge numbers have been present on motion picture negative film stocks for
many years in human readable form.
specific to various manufacturers and film stock types. In 1988, Eastman Kodak,
in conjunction with the Society of Motion Picture and Television Engineers devised
a new edge print that not only standardizes the numbering format, but is also
printed as a machine readable barcode.
KeyKode. Other film manufacturers have adopted this numbering standard and
have each given their version a proprietary name. For the sake of clarity we shall
refer to all of these implementations as Film barcode.
This purpose of this chapter is to describe the installation procedures and day to
day operating practices used when fitting an external Film Barcode reader to the
4025 Film Footage Encoder.
The 4025 Film Footage Encoder interfaces to external Film barcode readers
manufactured by Evertz, ARRI, Cinema Products or Research In Motion. These
units consist of a bar code reader pickup head, and a decoder device. The pickup
head transforms the optical dark and light bar code into electronic signals and is
designed to mount on the telecine feed roller just before the film enters the gate.
The decoder receives these electronic signals from the pickup head, and sends
the decoded KeyKode number via a serial link to the 4025. The way in which the
4025 uses the KeyKode information is set using the FILM drop down of the On
screen menu system.
When installing the pickup head on the telecine, an automatic alignment procedure
in the 4025 calculates the exact perforation offset between the head and the gate.
The one-of-four perforation ambiguity with 35 mm KeyKode is automatically
compensated for each time the film is rolled, making the day to day operation as
effortless as possible. Operation with the KeyKode reader installed consists of
entering the reference frame's time code number. An on screen KeyKode status
display, which shows the perf that has been detected, and the error between the
KeyKode number read and the bi-phase based value, is useful in verifying that the
correct operational mode has been selected.
The following sections describe the installation for each of the Film Barcode reader
systems supported. In addition to the physical installation, there are calibration
procedures for the 4025 that need to be done. These are detailed in section 6.5.4.
Model 4025 Film Footage Encoder Manual
The edge numbering format has been
Kodak calls this numbering system
Page 8-1
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