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Description of the data path
PIKE Technical Manual V4.0.0
165
Color correction
Why color correction?
The spectral response of a CCD is different of those of an output device or
the human eye. This is the reason for the fact that perfect color reproduction
is not possible. In each PIKE camera there is a factory setting for the color
correction coefficients, see Chapter GretagMacbeth ColorChecker on page
165.
Color correction is needed to eliminate the overlap in the color channels. This
overlap is caused by the fact that:
• Blue light: is seen by the red and green pixels on the CCD
• Red light: is seen by the blue and green pixels on the CCD
• Green light: is seen by the red and blue pixels on the CCD
The color correction matrix subtracts out this overlap.
Color correction in AVT cameras
In AVT cameras the color correction is realized as an additional step in the
process from the sensor data to color output.
Color correction is used to harmonize colors for the human eye. With other
AVT (color) cameras so far, you had the opportunity to use it or to switch it
off.
PIKE cameras introduce for the first time the so-called color correction
matrix. This means: you are now able to manipulate the color-correction
coefficients yourself.
Color correction: formula
Before converting to the YUV format, color correction on all color models is
carried out after BAYER demosaicing via a matrix as follows:
GretagMacbeth ColorChecker
Sensor-specific coefficients C
xy
are scientifically generated to ensure that
GretagMacbeth™ ColorChecker®-colors are displayed with highest color fidel-
ity and color balance.
These coefficients are stored in user set 0 and can not be overwritten (factory
setting).
Formula 1: Color correction
red* Crr red× Cgr green× Cbr blue×++=
green* Crg red× Cgg green× C/jointfilesconvert/494653/bg blue×++=
blue* Crb red× Cgb green× Cbb blue×++=
- 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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