Baumer VEXG - Page 38

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Pixel depth: In general, pixel depth denes the number of possible different values for
each color channel. Mostly this will be 8 bit, which means 2
8
different "col-
ors".
For RGB or BGR these 8 bits per channel equal 24 bits overall.
Two bytes are needed for transmitting more than 8 bits per pixel - even if the
second byte is not completely lled with data. In order to save bandwidth, the
packed formats were introduced to Baumer VEX cameras. In this formats,
the unused bits of one pixel are lled with data from the next pixel.
8 bit:
Byte 1 Byte 2 Byte 3
12 bit:
Byte 1 Byte 2
unused bits
Packed:
Byte 1 Byte 2 Byte 3
Pixel 0Pixel 1
8.1.2.2 Pixel Formats VEXG
Camera Type Mono8 Mono10 Mono12 Mono12p Bayer RG8 Bayer RG10 Bayer RG12 Bayer RG129
Monochrome
VEXG-02M ■ ■ □ □ □ □ □ □
VEXG-13M ■ ■ □ □ □ □ □ □
VEXG-25M ■ ■ □ □ □ □ □
VEXG-52M.R ■ □ ■ ■ □ □ □ □
VEXG-100M.R ■ □ ■ ■ □ □ □ □
Color
VEXG-02C □ □ □ □ ■ ■ □ □
VEXG-13C □ □ □ □ ■ ■ □ □
VEXG-25C □ □ □ □ ■ ■ □ □
VEXG-52C.R □ □ □ □ ■ □ ■ ■
VEXG-100C.R □ □ □ □ ■ □ ■ ■
Figure13►
Bit string of Mono 8 bit
and RGB 8 bit.
Figure14►
Spreading of Mono 12
bit over two bytes.
Figure15►
Spreading of two pix-
els in Mono 12 bit over
three bytes (packed
mode).