Allied Vision Technologies MF-145B2 Instruction Manual download pdf (Page 57)

Description of the data path

8.3 White balance

color cameras have both manual and automatic white balance. White balance is applied so

at non-colored image parts are displayed non-colored.

White balance does not use the so called PxGA® (P end

litude modulation from the sensor is in the form of

The

ixel Gain Amplifier) of the analog front

(AFE) but a digital representation in the FPGA in order to modify the gain of the two channels

with lower output by +9.5dB (in 106 steps) relative to the channel with highest output.

The following screenshot is taken from the datasheet of the AFE and illustrates the details:

e analog color signal, coming in pulse ampTh

the BAYER™ color pattern sequence. It is initially processed in the CDS (correlated double

sampler) then bypasses the PxGA before further amplification and digitization.

Figure 31: Block diagram of AFE (Source: Analog Devices)

From the user’s point, the white balance settings are made in register 80Ch of IIDC v. 1.3. This

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Allied Vision Technologies MF-145B2 Instruction Manual Page 57