User`s manual

Operation and Features
BASLER A101f 3-21
DRAFT
Once the conversion to YUV is complete, pixels are transmitted from the camera in the YUV
(4:2:2) format as defined in Section 2.1.3
Video Data Payload Structure in the 1394-based Digital
Camera Specification Version 1.20.
3.11.1 White Balance
White balance capability has been implemented on the A101fc. With white balancing, a correction
factor can be applied to the U values and to the V values transmitted from the camera.
The U_Value field of the WHITE_BALANCE control register can be used to apply a correction
factor to the U values transmitted from the camera. The setting for the field can range from 0 to
255. If the field is set to 0, the image will be less blue. If the field is set to 128, there will be no
effect on the image. And if the field is set to 255, the image will be more blue.
The V_Value field of the WHITE_BALANCE control register can be used to apply a correction
factor to the V values transmitted from the camera. The setting for the field can range from 0 to
255. If the field is set to 0, the image will be less red. If the field is set to 128, there will be no effect
on the image. And if the field is set to 255, the image will be more red.
3.11.2 Using the A101fc in a Monochrome Mode
The A101fc color camera is normally used in a YUV (4:2:2) color output mode. The camera can
also operate in several 8 bit monochrome output modes. The 1394 Digital Camera Specification
indicates that when a color camera is operating in a monochrome mode, the camera should output
the Y value for each pixel. The
A101fc does not operate this way. Instead, it outputs the raw data
for each pixel. This allows the camera user to perform color interpolations or other processing
algorithms on pixel data that has not been manipulated.
3.11.3 Integrated IR Cut Filter on C-Mount Equipped Cameras
Cameras equipped with a C-mount lens adapter contain an IR cut filter inside of the camera. The
location of the filter limits the thread length of the lens that is used on the camera. See Section 5.5
for more details on lens thread length.
Cameras equipped with an F-mount lens adapter do not contain an IR cut filter.
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The values for U and for V normally range from -128 to +128. Because the 1394 Dig-
ital Camera specification requires that U values and V values be transmitted with un-
signed integers, 128 is added to each U value and to each V value before the values
are transmitted from the camera. This process allows the values to be transmitted on
a scale that ranges from 0 to 256 (for more information, see Section 2.1.4
Data Struc-
ture
in the 1394-based Digital Camera Specification Version 1.20).
As a result of the conversion process, the pixel data for the first line and for the first
column is not useful. This data should be discarded.
When an
A101fc is operating in a YUV (4:2:2) mode, the average number of bits per
pixel is 16. This means that the camera will require twice the bandwidth of a camera
operating in 8 bit monochrome mode.
The
A101fc can operate in several YUV (4:2:2) color modes and can also operate in
several monochrome 8 bit modes (see Sections 3.12.3 and 3.12.4).