Photron FASTCAM ultima APX-i2, Руководство по оборудованию

Страница: 51 / 147

FASTCAM-ultima APX-i2 Hardware Manual
-49-
4.1. Initialization (Calibration)
To take advantage of maximam performance of the APX-i2 system high image quality,
it is necessary to correct the non-uniformity in sensitivity of each pixel of the imaging
sensor. The APX has a calibration (shading correction) function that corrects the
non-uniformity in output of each pixel based on black level. This function uses a uniform
black image as reference to null the output of each pixel against black, making it
possible to obtain uniform output from each of pixels in proportion to the level of
incoming light.
Calibration is carried out automatically when the system is switched on. For the best
result of recording, however,
it is strongly recommended that whenever you
change framing parameters such as resolution, gain, frame rate, shutter speed,
etc
., you carry out calibration of the camera before starting a recording.
It may happen that as follows, but It will be resolved if you carry out calibration.
◆
Horizontality fixed noise appears.
◆
Partial area is clear but other area has noise.
The following procedure shows how to initialize the system.
4.1.1. Start Calibration
1. Turn off power to the intensifier.
2. Set up framing parameters such as frame rate and shutter speed.
3. Place a cap on the lens to completely cover it. The black image at this time is used
as reference black. Make sure the lens is covered and there is no light falling on
the imaging sensor.
4. Press the MENU button on the keypad to display the menu.
5. Use the joystick on the menu to go to [CALIBRATE] and press the joystick down to
select.
CA LIBRATE
OFF
ON
SAV E
L OAD
R ESERVE D
L U T SEL EC T
CA LIBRATE
D S SHU TTER
D IGITA L I/ F SE T
TIME SET
DA TE/ TIM E
6. Use the joystick to go to [ON]. Double check if the lens is completely covered and
press the joystick down at [CALIBRATE] to execute calibration.
7. Remove the lens cap and make sure corrected image is displayed.