JAI AT-140GE - Manual (Page 25)

AT-140GE
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Analog Signal [mV]
Black Level
1023
890
32
0
25 700
D
ig
it
al
O
u
t
[L
SB
]
White Clip Level
100% Level
800
8. GigE Vision Streaming Protocol (GVSP)
8.1. Digital Video Output (Bit Allocation)
Although the AT-140GE is a digital camera, the image is generated by an analog component,
the CCD sensor.
The table and diagram below show the relationship between the analog CCD output level and
the digital output.
CCD out Analog Signal * Digital Out(24-bit) Digital Out(32-bit)
Black Setup 3.6%, 25mV 8LSB 32LSB
200mV 700mV 222LSB 890LSB
230mV 800mV 255LSB 1023LSB
The standard setting for 10-bit video level is 890 LSB. 200 mV CCD output level equals 100%
video output.
Fig.20 Digital output (10-bit output)
8.2. Bit Allocation (Pixel Format / Pixel Type)
In the GigE Vision Interface, GVSP (GigE Vision Streaming Protocol) is used for an application
layer protocol relying on the UDP transport layer protocol. It allows an application to receive
image data, image information and other information from a device.
As for the sensors in the AT-140GE, the following pixel types supported by GVSP are available.
With regard to the details of GVSP, please refer to the GigE Vision Specification available
from the AIA (
www.machinevisiononline.org ).
8.2.1 GVSP_PIX_RGB8_PACKED (RGB 24bit output)
1 Byte 2 Byte 3 Byte 4 Byte
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
R0 G0 B0