24
6.6.3
Exposure time
The exposure time is based on the following formula:
Register value x Ti Offset
The register value is the value set in the corresponding IIDC register (SHUTTER [81Ch]).
This number which lies in the range between 1 and 4095.
The Shutter register value is multiplied by the Time base register value (see
TIMEBASE
).
The default value here is set to 20µs.
A camera-specific offset of 29 µs is also added to this value.
Example
Register value: 100
Timebase: 20 µs
100 x 20 µs + 29 µs = 2029 µs exposure time.
The minimum adjustable exposure time set by register is 10µs. => the real minimum
exposure time of an F-201B is then 10µs + 29µs = 39µs.
7
Block diagrams of the camera
7.1
Description of the data path
In the following diagrams you can see the data flow and the bit resolution of image
data after being read from the CCD chip in the camera. The individual steps are
described in more detail in the following paragraphs.
F-201B up to FW 0.83
CCD
Gain
Offset
LUT
(gamma)
Shading
12 Bit
8 Bit
8 Bit
F-201B from FW 0.84
CCD
Gain
Offset
Shading
LUT
12 Bit
12 Bit
10/8 Bit
F-201C
White
Balance
CCD
Gain
Offset
LUT
(gamma)
Color
Correction
RGB->YUV
Conversion
Color
Interpolation
12 Bit
10 Bit
8 Bit
8 Bit
8 Bit