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Description of the data path
PIKE Technical Manual V4.0.0
127
How to store shading image
There are two storing possibilities:
• After generating the shading image in the camera, it can be uploaded to
the host computer for nonvolatile storage purposes.
• The shading image can be stored in the camera itself.
The following pictures describe the process of automatic generation of cor-
rection data (PIKE F-032C). Surface plots and histograms were created using
the ImageJ program.
• On the left you see the source image with non-uniform illumination.
• The surface plot on the right clearly shows a gradient of the brightness
(0: brightest 255: darkest pixels).
• The histogram shows a wide band of gray values.
By defocusing the lens, high-frequency image data is removed from the
source image, therefore its not included in the shading image.
Figure 63: Shading correction: Source image with non-uniform illumination
surface plot
histogram
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2560
Count: 307200 Min: 79
Mean: 135.337 Max. 19
StdDev. 30.497 Mode: 88 (4200)
- Technical Manual 1
- AVT Pike 1
- Legal notice 2
- Contents 3
- Introduction 10
- Before operation 13
- Declarations of conformity 14
- *: also -15fps variant 15
- Safety instructions 16
- Cautions 17
- Environmental conditions 17
- PIKE types and highlights 18
- FireWire 21
- FireWire in detail 22
- 1394b bandwidths 27
- FireWire hot plug precautions 31
- Operating system support 31
- System components 32
- Camera lenses 34
- Specifications 36
- PIKE F-032B / F-032B fiber 37
- PIKE F-032C / F-032C fiber 39
- PIKE F-100B / F-100B fiber 41
- PIKE F-100C / F-100C fiber 43
- PIKE F-210B / F210B fiber 49
- PIKE F-210C / F-210C fiber 51
- PIKE F-421B / F-421B fiber 53
- PIKE F-421C / F-421 C fiber 55
- PIKE F-505B / F-505B fiber 57
- PIKE F-505C / F-505C fiber 59
- Spectral sensitivity 61
- Camera dimensions 67
- Tripod adapter 69
- Pike W90 (2 x 1394b copper) 70
- Pike W270 (2 x 1394b copper) 74
- Adjustment of C-Mount 81
- F-Mount, K-Mount, M39-Mount 82
- PIKE fiber 84
- Status LEDs 90
- Operating the camera 92
- In1 – Pin 4 94
- In2 – Pin 11 94
- InGND – Pin 7 94
- PIKE Technical Manual V4.0.0 100
- Camera interfaces 102
- Pixel data 107
- Description of the data path 110
- Color cameras 111
- Channel balance 112
- White balance 115
- Automatic white balance 118
- Auto shutter 119
- Auto gain 121
- Manual gain 123
- Horizontal mirror function 125
- Shading correction 126
- How to store shading image 127
- Output = f (Input) 133
- Write n databytes 134
- 2 x / 4 x / 8 x binning 135
- Vertical binning 136
- Horizontal binning 138
- Figure 75: 8 x full binning 141
- 8 x full binning 141
- What is sub-sampling? 142
- Description of sub-sampling 142
- 2 out of 16 H+V sub-sampling 146
- Why new timing modes? 151
- ☺ Disadvantage 153
- Packed 12-Bit Mode 156
- Deferred image transport 157
- HoldImg mode 159
- FastCapture mode 161
- (BAYER demosaicing) 162
- Sharpness 163
- Hue and saturation 164
- Color correction 165
- Color conversion (RGB YUV) 167
- Bulk Trigger 167
- Level Trigger 167
- Serial interface 168
- Controlling image capture 173
- Trigger delay 178
- Exposure time 180
- Minimum exposure time 181
- Extended shutter 181
- One-shot 183
- Exposure 185
- Multi-shot 186
- ISO_Enable / Free-Run 186
- Asynchronous broadcast 186
- Jitter at start of exposure 187
- Sequence mode 189
- SetupMode to 193
- Disable SetupMode 193
- SIS: Definition 198
- SIS: Scenarios 198
- Smear reduction 200
- PIKE F-032B / PIKE F-032C 201
- PIKE F-100B / PIKE F-100C 203
- PIKE F-210B / PIKE F-210C 207
- PIKE F-421B / PIKE F-421C 209
- PIKE F-505B / PIKE F-505C 211
- Area of interest (AOI) 213
- Autofunction AOI 215
- Frame rates 216
- Frame rates Format_7 220
- PIKE F-032: AOI frame rates 221
- PIKE F-100: AOI frame rates 223
- (no sub-sampl.) 229
- (sub-sampl.) 231
- AOI height / pixel 232
- Frame rate / fps 232
- PIKE F-421: AOI frame rates 236
- PIKE F-505: AOI frame rates 238
- Test images 243
- Test images for color cameras 244
- Configuration of the camera 245
- Sample program 249
- Example FireStack API 250
- Configuration ROM 251
- Implemented registers 254
- Format_7 276
- Advanced features 278
- Advanced feature inquiry 283
- Camera status 285
- Maximum resolution 286
- Time base 286
- Look-up tables (LUT) 290
- Frame information 297
- Input/output pin control 297
- Delayed Integration enable 298
- Auto shutter control 299
- Auto gain control 300
- Mirror image 304
- Soft Reset 305
- Parameter-List Update 309
- Format_7 mode mapping 310
- Secure image signature (SIS) 312
- User profiles 317
- GPDATA_BUFFER 320
- Firmware update 321
- Appendix 322
- PIKE Technical Manual V4.0.0 332
- , 117, 118 332
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