Baumer EX Series Manual do utilizador - Página 15

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Baumer EX Series Manual do utilizador
4.1.2 Pixel Format
On Baumer digital cameras the pixel format depends on the selected image format.
4.1.2.1 Definitions
RAW:
Raw data format. Here the data are stored without processing.
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 single 
color. In general, shades of gray or black-and-white are synonyms for mono-
chrome�
RGB:
Color  model,  in  which  all  detectable  colors  are  defined  by  three  coordinates, 
Red, Green and Blue.
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). Thereby 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, its value can be calculated from 
the other three values.
YUV 4:4:4
YUV 4:2:2
YUV 4:1:1
White
Green
Here each of the three components has the same sample rate.
Therefore there is no subsampling here.
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.
Here  the  chroma  components  are  sampled  at  a  quater  of  the   
sample  rate.This  decreases  the  necessary  bandwith  by  half  (in 
relation to 4:4:4).
Red
Black
Blue
◄ Figure 9
Sensor with Bayer 
Pattern
◄ Figure 10
RBG color space dis-
played as color tube.
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