Kodak DryView 8150, Руководство по обслуживанию, Страница: 250 / 470

Service Manual
6-48
7F3318 2005 July Rev. B
Figure 6-26. Image Path through GSM
The main components of GSM include:
•
Contrast LUT -- The image received from the MODALITY into PACSLink MIM is filtered through a
Contrast LUT, which is created from information from a specific Transfer Function table (TFT),
which is modified by user-defined values for Contrast and Dmax, and the film Dmax and Dmin for
each image on the film that has a unique contrast setting.
•
TFT -- This table, selected at installation for the MODALITY, defines the relationship between the
digital values input form the MODALITY and the desired Transmittance (T) values output to the
Laser. Each TFT is a specific table selected from a TFT set of 15 tables.
•
Media LUT -- This LUT is created from the Film Model. It contains the output laser diode values
necessary for the desired sensitometries.
•
Film Model -- The Film Model defines the print characteristics for a particular lot of film. It is created
from:
-- The Dmin and Dmax constants defined for the film type
-- The density step wedge data read from a calibration print
-- The dynamic range of the Laser
Note
The 3 most recent Film Models are stored in the DRE. When a film CARTRIDGE is opened, the
sensitometry information from the RF TAG is compared to the data in the Film Models. If the TAG
data matches an existing Film Model and the date of creation of the Film Model is 7 days old or less,
the Media LUT is built from this Film Model. Otherwise a calibration print is requested and a new Film
Model is built.
•
Hardware Media Linear LUT -- This LUT exists in firmware on the MCS Board. In earlier IMAGERS
this LUT performed the same functions as the Media LUT in the DRE software. In the 8150
IMAGER the sole purpose of the Media Linear LUT is to convert 12--bit image data to 14--bit data
for the D-A CONVERTER that feeds the Laser control circuits.