Allied Vision Technologies MF-145B2 Instruction Manual Page 65
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Marlin Technical ManualV.2.7.0
65
Description of the data path
White balance
There are two types of white balance:
• one-push white balance: white balance is done only once
(not continuously)
• auto white balance (AWB): continuously optimizes the color characteris-
tics of the image
Marlin color cameras have both one-push white balance and auto white bal-
ance.
White balance is applied so that non-colored image parts are displayed non-col-
ored.
White balance does not use the so called PxGA® (Pixel Gain Amplifier) of the ana-
log front end (AFE) but a digital representation in the FPGA in order to modify
the gain of the two channels with lower output by +9.5 dB (in 106 steps) relative
to the channel with highest output.
The following screenshot is taken from the data sheet of the AFE and illustrates
the details:
Figure 34: Block diagram of AFE (Source: Analog Devices)
- Technical Manual 1
- Legal notice 2
- Contents 3
- Contacting Allied Vision 8
- Introduction 9
- on page 12
- Manual overview 15
- More information 17
- Before operation 18
- Marlin cameras 20
- Conformity 21
- Specifications 22
- Marlin F-033B/C 23
- Marlin F-046B/C 24
- Marlin F-080B/C (-30 fps*) 25
- Marlin F-145B2/C2 26
- Marlin F-146B/C 27
- Marlin F-201B/C 28
- Marlin F-131B (b/w also: NIR) 29
- Spectral sensitivity 30
- Red Green Blue 36
- Camera dimensions 37
- Tripod adapter 38
- Marlin W90 39
- Marlin W90 S90 40
- Marlin W270 41
- Marlin W270 S90 42
- Filter and lenses 43
- Camera interfaces 45
- Status LEDs 47
- Delay set by register 56
- Pixel data 57
- Description of the data path 60
- Color cameras 61
- White balance 65
- One-push white balance 67
- Auto white balance (AWB) 68
- AF_AREA_POSITION: Left,Top 69
- Auto shutter 70
- Auto gain 73
- Manual gain 75
- Write LUT data in 78
- Horizontal mirror function 88
- 2 x binning 89
- Vertical binning 90
- Horizontal binning 91
- 2 x full binning 92
- Sub-sampling (Marlin F-131B, 93
- Parameter update timing 98
- Sharpness 99
- Color correction 101
- Color conversion (RGB YUV) 102
- Hue and saturation 102
- Serial interface 103
- Name Field Bit Description 104
- Marlin F-033B/ Marlin F-033C 109
- Marlin F-046B/ Marlin F-046C 110
- Marlin F-146B / Marlin F-146C 114
- Marlin F-201B / Marlin F-201C 116
- Marlin F-131B (NIR) 118
- Area of interest (AOI) 120
- Autofunction AOI 122
- Frame rates 123
- Frame rates Format_7 127
- Marlin F-033: AOI frame rates 128
- Marlin F-046: AOI frame rates 129
- Marlin F-080: AOI frame rates 130
- Ch eTransarg 132
- Marlin F-145: AOI frame rates 133
- Marlin F-146: AOI frame rates 134
- Marlin F-201: AOI frame rates 135
- Marlin F-131: AOI frame rates 136
- Controlling image capture 137
- Trigger delay 142
- Exposure time offset 145
- Minimum exposure time 145
- Extended shutter 146
- One-shot 147
- Exposure 148
- Multi-Shot 149
- ISO_Enable / Free-Run 149
- Asynchronous broadcast 149
- Jitter at start of exposure 150
- Deferred image transport 151
- HoldImg mode 152
- FastCapture 153
- Sequence mode 154
- SEQUENCE_PARAM 156
- Secure image signature (SIS) 159
- Test images 161
- Test images for color cameras 163
- Configuration of the camera 165
- Sample program 167
- Configuration ROM 168
- 0-7 8-15 16-23 24-31 169
- Camera initialize register 171
- PIO_Control_Quadlet_Offset 184
- SIO_Control_Quadlet_Offset 184
- Strobe_Output_Quadlet_Offset 184
- Name Notes 188
- Format_7 193
- Advanced registers summary 194
- Version information inquiry 197
- Advanced feature inquiry 199
- Maximum resolution 201
- Time base 202
- Sequence control 204
- Look-up tables (LUT) 205
- Shading correction 206
- Frame information 208
- High dynamic range mode 209
- (Marlin F-131B only) 209
- DSNU control 210
- Input/output pin control 211
- Auto shutter control 213
- Auto gain control 213
- Mirror image 216
- Soft Reset 216
- Cycles Seconds 218
- User profiles 221
- GPDATA_BUFFER 225
- Firmware update 226
- Appendix 227
- , 71, 73, 74, 76 228
- , 101, 215 230
- , 108, 165 230
- , 152, 207 230
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