Silicon Imaging SI-2K, Руководство пользователя

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QuickStartGuide
SI 2K Manual
this can pose a big problem. Fan mode 2 will keep the fans quiet no matter
what, although again, recording will stop at 100C. But once recording stops,
the fans kick in at full-speed to keep the camera as cool as possible before the
next recording.
Set Resolution and Frame Rate
Browse to RESOLUTION / FRAME RATE and choose i.e.:
2048 x 1080 @ 25p
Confirm RESOLUTION / FRAME RATE with OK
After that, the System will prompt to “SET BLACK”. Close Lens and Iris to
Set Black with for all Gains. If not, please choose “SET BLACK” manually.
Set Black
NOTE: better set black more often than prompted as the fixed pattern noise
changes with the temperature of the camera !
Cover the lens with the lens cap
Browse to MAIN MENU and press SET BLACK
Tick the check box, if you want to SET BLACK for all gains
Press OK to start process, remoce lens cap only after process is finished
SET BLACK calibrates the black level of the sensor, performing a correction
of any fixed pattern noise and column-to-column variations created from incon-
sistencies in the analog-to-digital conversion process, as well as removing any
hot or deviant pixels. Fixed pattern noise on a CMOS sensor looks like a fixed
„screen-door“ effect, or like fixed vertical lines going down the image, and is
typically visible in darker or gained up portions of the image.
All CMOS sensors have this attribute, but because this fixed pattern noise is a
black pure offset, it can easily be removed through a subtraction process which
the SET BLACK operations performs. Furthermore, Altasens CMOS sensor
designs exhibit extremely low amounts of fixed pattern noise, further enabling
the SI-2K to maintain clean blacks after a calibration operation.
After a SET BLACK operation, SiliconDVR saves the black frame for that reso-
lution on the disk, so that it can be recalled the next time you boot the program
or swich modes. This prevents the user from having to repeatedly cover the
lens and SET BLACK. It also saves a listing of deviant pixels that are masked
out, preventing them from being embedded in the recorded RAW files.
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