Gige Vision Streaming Protocol (Gvsp); Digital Video Output (Bit Allocation); Bit Allocation (Pixel Format / Pixel Type); Gvsp_Pix_Rgb8_Packed (Rgb 24Bit Output) - JAI AT-200GE User Manual

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8. GigE Vision Streaming Protocol (GVSP)

8.1. Digital Video Output (Bit Allocation)

Although the AT-200GE 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
Black
200mV
230mV
The standard setting for 10-bit video level is 890 LSB. 200 mV CCD output level equals 100%
video output.
1023
890
32 Black Level
0
25 Analog Signal [mV]
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-200GE, 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
R0
0 1 2 3 4 5 6 7
Analog Signal * Digital Out(24-bit) Digital Out(32-bit)
Setup 3.6%, 25mV
700mV
800mV
White Clip Level
100% Level
800
700
3 Byte
G0
0 1 2 3 4 5 6 7
AT-200GE
8LSB
222LSB
255LSB
4 Byte
0 1 2 3 4 5 6 7
- 23 -
32LSB
890LSB
1023LSB
B0