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9.1.2 Pixel Format
On Baumer digital cameras, the pixel format depends on the selected image format.
Definitions
9.1.2.1
RAW:
Raw data format. Here, the data is stored without being processed.
Bayer:
Raw data format of color sensors.
Color filters are placed on these sensors in a checkerboard pattern, generally
in a 50% green, 25% red and 25% blue array.
Mono:
Monochrome. The color range of mono images consists of shades of a sin-
gle color. In general, shades of gray or black-and-white are synonymous with
monochrome.
RGB:
Color model in which all detectable colors are defined by three coordinates,
Red, Green and Blue.
Red
Green
Blue
Black
White
The three coordinates are displayed within the buffer in the order R, G, B.
BGR:
Here, the color alignment mirrors RGB.
YUV:
Color model, which is used in the PAL TV standard and in image compression.
In
YUV, a high bandwidth luminance signal (Y: luma information) is transmitted
together with two color difference signals with low bandwidth (U and V: chroma
information). U represents the difference between blue and luminance (U = B -
Y), V is the difference between red and luminance (V = R - Y). The third color,
green, does not need to be transmitted as its value can be calculated from the
other three values.
YUV 4:4:4
Here, each of the three components has the same sample rate.
There is therefore no sub-sampling in this case.
YUV 4:2:2
The chroma components are sampled at half the sample rate.
This reduces the necessary bandwidth to two-thirds (in relation to
4:4:4) and causes no, or low visual differences.
YUV 4:1:1
Here, the chroma components are sampled at a quarter of the
sample rate. This decreases the necessary bandwidth by half (in
relation to 4:4:4).
Figure 8 ►
Sensor with Bayer
Pattern
Figure 9 ►
RBG color space dis-
played as color tube.
Summary of Contents for USB3 Vision
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