Gige Vision Streaming Protocol (Gvsp); Digital Video Output (Bit Allocation); Bit Allocation (Pixel Format / Pixel Type) - Cm-140Ge/-Ra (Monochrome); Gvsp_Pix_Mono8 (8Bit) - IAI cm-140ge User Manual

7. GigE Vision Streaming Protocol (GVSP)

7.1. Digital Video Output (Bit Allocation)

Although the CM-140GE/CM-140GE-RA and CB-140GE/CB-140GE-RA are digital cameras, 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. 12. Digital Output
7.2. Bit Allocation (Pixel Format / Pixel Type) – CM-140GE/-RA (monochrome)
In the GigE Vision Interface, GVSP (GigE Vision Streaming Protocol) is used as 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.
In the monochrome camera, CM-140GE/CM-140GE-RA, the following pixel types supported by GVSP
are available.
With regard to the details of GVSP, please refer to GigE Vision Specification available from AIA
(www.machinevisiononline.org).

7.2.1. GVSP_PIX_MONO8 (8bit)

１Byte
Y0
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
CM-140 GE / -RA/-UV / CB-140GE/-RA
Analog Signal *
Setup 3.6%, 25mV
700mV
800mV
White Clip Level
100% Level
700 800
２Byte
Y1
Digital Out(10-bit)
32LSB
890LSB
1023LSB
３Byte
- 19 -
Y2