AW00118303000 Pixel Data Formats
Basler racer GigE 159
9.2.5 YUV 4:2:2 (YUYV Packed) Format
When a monochrome camera is set for the YUV 4:2:2 (YUYV) Packed pixel data format, the camera
transmits Y, U, and V values in a fashion that mimics the output from a color camera set for YUV
4:2:2 (YUYV) Packed.
The YUV 4:2:2 (YUYV) packed pixel data format is similar to the YUV 4:2:2 pixel format described
in the previous section. The only difference is the order of the bytes transmitted to the host PC. With
the YUV 4:2:2 format, the bytes are ordered as specified in the DCAM standard issued by the 1394
Trade Association. With the YUV 4:2:2 (YUYV) format, the bytes are ordered to emulate the
ordering normally associated with analog frame grabbers and Windows
®
frame buffers.
The Y value transmitted for each pixel is the actual 8 bit brightness value similar to the pixel data
transmitted when a monochrome camera is set for Mono 8. The U and V values transmitted will
always be zero. With this format, a Y value is transmitted for each pixel, but the U and V values are
only transmitted for every second pixel.
The table below describes how the pixel data for a received frame will be ordered in the image buffer
in your PC when the camera is set for YUV 4:2:2 (YUYV) output.
With this format, the Y component is transmitted for each pixel, but the U and V components are
only transmitted for every second pixel.
The following standards are used in the table:
P
0
= the first pixel transmitted by the camera
P
n
= the last pixel transmitted by the camera
B
0
= the first byte in the buffer
B
m
= the last byte in the buffer
Byte Pixel - Data Bits
B
0
Y P
0
7 ... 0
B
1
U P
0
7 ... 0
B
2
Y P
1
7 ... 0
B
3
V P
0
7 ... 0
B
4
Y P
2
7 ... 0
B
5
U P
2
7 ... 0
B
6
Y P
3
7 ... 0
B
7
V P
2
7 ... 0
B
8
Y P
4
7 ... 0
B
9
U P
4
7 ... 0
B
10
Y P
5
7 ... 0
B
11
V P
4
7 ... 0
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