where MaximumExposureTime is the maximum exposure time that
can be implemented for the current frame acquisition rate. The for-
mula is an exponential function modified to mimic the extension of
the hardware gain in terms of changes in the average measured
intensity of a white HDPE cutting board under ambient fluorescent
lighting. Pressing the ‘‘Gain’’ icon ( Fig. 4 ) brings up a form that
graphically displays gains by wavelengths for five named gain pro-
files: ‘‘HDPE Fixed’’, ‘‘SS Fixed’’ (Stainless Steel), ‘‘General’’, ‘‘HDPE’’,
and ‘‘SS’’ along with the name of the profile currently in use. Profile
names are arbitrary, and are meant only to ease identification of
displayed profiles. The user is asked to select the gain profile to
be used and, for the last three profiles, whether the gain array for
the selected profile should be recalculated. Each time a gain array
for a profile is recalculated, a corresponding text file is written to
disk. The most recent file for each profile is read when the system
is turned on. For this study, the ‘‘HDPE Fixed’’ and the ‘‘SS Fixed’’
profiles were renamed ‘‘Gain 0’’ and ‘‘Gain 4’’, and the associated
gain arrays were assigned uniform values of 0 or 4, respectively.
where MaximumExposureTime is the maximum exposure time that
can be implemented for the current frame acquisition rate. The for-
mula is an exponential function modified to mimic the extension of
the hardware gain in terms of changes in the average measured
intensity of a white HDPE cutting board under ambient fluorescent
lighting. Pressing the ‘‘Gain’’ icon ( Fig. 4 ) brings up a form that
graphically displays gains by wavelengths for five named gain pro-
files: ‘‘HDPE Fixed’’, ‘‘SS Fixed’’ (Stainless Steel), ‘‘General’’, ‘‘HDPE’’,
and ‘‘SS’’ along with the name of the profile currently in use. Profile
names are arbitrary, and are meant only to ease identification of
displayed profiles. The user is asked to select the gain profile to
be used and, for the last three profiles, whether the gain array for
the selected profile should be recalculated. Each time a gain array
for a profile is recalculated, a corresponding text file is written to
disk. The most recent file for each profile is read when the system
is turned on. For this study, the ‘‘HDPE Fixed’’ and the ‘‘SS Fixed’’
profiles were renamed ‘‘Gain 0’’ and ‘‘Gain 4’’, and the associated
gain arrays were assigned uniform values of 0 or 4, respectively.
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