Bayer Bg 12 Format - Basler ace acA640-90gm User Manual

9.3.2

Bayer BG 12 Format

When a color camera is set for the Bayer BG 12 pixel data format, it outputs 16 bits of data per pixel
with 12 bits effective. The 12 bits of effective pixel data fill from the least significant bit. The four
unused most significant bits are filled with zeros.
With the Bayer BG 12 the pixel data is not processed or interpolated in any way. So, for each pixel
covered with a red lens, you get 12 effective bits of red data. For each pixel covered with a green
lens, you get 12 effective bits of green data. And for each pixel covered with a blue lens, you get 12
effective bits of blue data. (This type of pixel data is sometimes referred to as "raw" output.)
The "BG" in the name Bayer BG 12 refers to the alignment of the colors in the Bayer filter to the
pixels in the acquired images. For even rows in the images, pixel one will be blue, pixel two will be
green, pixel three will be blue, pixel four will be green, etc. For odd rows in the images, pixel one
will be green, pixel two will be red, pixel three will be green, pixel four will be red, etc.
For more information about the Bayer filter, see Section 9.3.1 on
The tables below describe how the data for the even rows and for the odd rows of a received frame
will be ordered in the image buffer in your PC when the camera is set for Bayer BG 12 output. Note
that the data is placed in the image buffer in little endian format.
The following standards are used in the tables:
P = the first pixel transmitted by the camera for a row
0
P = the last pixel transmitted by the camera for a row
n
B = the first byte of data for a row
0
B = the last byte of data for a row
m
Even Rows
Byte Data
B Low byte of blue value for P
0
B High byte of blue value for P
1
B Low byte of green value for P
2
B High byte of green value for P
3
B Low byte of blue value for P
4
B High byte of blue value for P
5
B Low byte of green value for P
6
B High byte of green value for P
7
• •
• •
• •
B Low byte of blue value for P
m-7
B High byte of blue value for P
m-6
Basler ace GigE
Odd Rows
Byte
B
0 0
B
0 1
B
1 2
B
1 3
B
2 4
B
2 5
B
3 6
B
3 7
•
•
•
B
n-3 m-7
B
n-3 m-6
page 171.
Data
Low byte of green value for P
High byte of green value for P
Low byte of red value for P
High byte of red value for P
Low byte of green value for P
High byte of green value for P
Low byte of red value for P
High byte of red value for P
•
•
•
Low byte of green value for P
High byte of green value for P
Pixel Data Formats
0
0
1
1
2
2
3
3
n-3
n-3
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