Omron STC-HD203 Series - Page 48

No. 13S054-10
STC-HD203DV / STC-HD203DV-CS / STC-HD203SDI / STC-HD203SDI-CS
Product Specifications and Users Guide
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USER mode
When AE Mode = 2[h] was selected, the USER mode is established. In this USER mode, the gain and exposure time
can be configured. If exposure time is longer than Normal AE maximum shutter time, Long AE mode will be available.
Exposure time can be set on USER mode shutter time (0x012 - 0x013).
Gain can be set on USER mode gain (0x014 - 0x015).
Flicker less mode
Horizontal band noise that is called “rolling bars” or “Flicker” and shown in the figure below is generated when
shooting under fluorescent lights whose flickering periods differ from the shutter periods. The function is capable of
reducing the rolling bars by adjusting the shutter speed so as to match the light-emitting frequency of the fluorescent
lights.
Auto Flicker less
If 50Hz flicker is detected, it will shift to 50Hz flicker-less. If 60Hz flicker will be detected, it will shift to 60Hz flicker-less.
When judging with outdoor during flicker-less compensation, flicker-less compensation shifts to OFF state.
50/60Hz fixed Flicker less mode
The table below shows the exposure times when the frame rate is 25, 30, 50, 60 and when the 50 Hz mode and 60
Hz mode are established by selecting this mode, respectively, as the flicker less mode setting.
The exposure time changes in steps. The minimum shutter time is approximately 1/100s and 1/120s in the 50 Hz
mode and 60 Hz mode, respectively. This minimum shutter time is called the flicker less minimum fixed shutter time
and the maximum is called flicker-less maximum shutter time.
Frame Rate 25fps Frame Rate 30fps
50Hz Fixed mode 60Hz Fixed mode 50Hz Fixed mode 60Hz Fixed mode
39.8
mseconds
1/25 seconds 33.4
mseconds
1/29 seconds - - 33.2
mseconds
1/30 seconds
20.1
mseconds
1/49 seconds 16.6
mseconds
1/60 seconds 20.1
mseconds
1/49 seconds 16.6
mseconds
1/60 seconds
10 mseconds 1/100 seconds 8.3 mseconds 1/120 seconds 10 mseconds 1/100 seconds 8.3 mseconds 1/120 seconds
Frame Rate 50fps Frame Rate 60fps
50Hz Fixed mode 60Hz Fixed mode 50Hz Fixed mode 60Hz Fixed mode
20.1
mseconds
1/49 seconds 16.6
mseconds
1/60 seconds - - 16.6
mseconds
1/60 seconds
10 mseconds 1/100 seconds 8.3 mseconds 1/120 seconds 10 mseconds 1/100 seconds 8.3 mseconds 1/120 seconds
AE convergence speed
The AE convergence speed register is used to set the time to be taken for the exposure amount appropriate for the
image to be established. The fastest setting is A[h]. If the setting is too high, the AE convergence speed will be
reduced. Conversely, if it is too low, hunting may occur.
Convergence end dead band range
The Convergence end identification dead band range register is used to set the range in which convergence is to be
identified, and convergence end is identified when the absolute value of the error amount is below the setting and the
same status has continued for 3 frames. The dead band range is the setting × 6.02/1024 [dB].