Allied Vision Guppy PRO, Technical Manual

Page: 5 / 254

Guppy PRO Technical Manual V4.1.2
5
Pulse-width modulation ................................................................................................................ 78
PWM: minimum and maximum periods and frequencies ...................................................... 79
PWM: Examples in practice ..................................................................................................... 80
Pixel data............................................................................................................................................. 80
Description of video data formats ................................................................................................ 81
Description of the data path
.......................................................................................................85
Block diagrams of Guppy PRO models ............................................................................................... 85
Monochrome models.................................................................................................................... 85
Color models.................................................................................................................................. 86
White balance..................................................................................................................................... 86
One-push white balance ............................................................................................................... 88
Auto white balance (AWB) ............................................................................................................ 89
Auto shutter........................................................................................................................................ 91
Auto gain............................................................................................................................................. 92
Manual gain ........................................................................................................................................ 95
Brightness (black level or offset) ........................................................................................................ 95
Mirror function (Guppy PRO F-503B, F-503C) ................................................................................... 96
Look-up table (LUT) and gamma function ......................................................................................... 97
Loading an LUT into the camera ................................................................................................... 98
Defect pixel correction (Guppy PRO F-503B, F-503C) ..................................................................... 100
Building defect pixel data............................................................................................................ 101
Grab an image with defect pixel data.................................................................................... 102
Calculate defect pixel coordinates......................................................................................... 102
Reset values (resolution, shutter, gain, brightness).............................................................. 102
Activate/deactivate defect pixel correction ............................................................................... 103
Store defect pixel data non-volatile............................................................................................ 103
Load non-volatile stored defect pixel data ................................................................................. 103
Send defect pixel data to the host .............................................................................................. 103
Receive defect pixel data from the host ..................................................................................... 103
Binning (monochrome CCD models and Guppy PRO F-503B, F-503C) ........................................... 103
2 × binning (Guppy PRO F-503 also 4 ×) ..................................................................................... 103
Vertical binning............................................................................................................................ 104
Horizontal binning ....................................................................................................................... 106
2 × full binning (Guppy PRO F-503 also 4 × full binning) ............................................................ 108
Sub-sampling (Guppy PRO F-503B, F-503C and monochrome CCD models).................................. 110
What is sub-sampling? ................................................................................................................ 110
Which Guppy PRO models have sub-sampling? ......................................................................... 110
Description of sub-sampling........................................................................................................ 110
Binning and sub-sampling access (Guppy PRO F-503B, F-503C, and monochrome CCD models) . 114
Packed 12-Bit Mode ......................................................................................................................... 117
Color interpolation (Bayer demosaicing) ......................................................................................... 117
Hue and saturation ........................................................................................................................... 119
Color correction................................................................................................................................ 119
Why color correction? ........................................................................................................... 119
Color correction in Allied Vision cameras.............................................................................. 120
Color correction: formula ...................................................................................................... 120