Instruction manual

Guppy Technical ManualV7.4.0
88
Description of the data path
As mentioned before two adjacent pixels in a line are used to calculate a luma (Y)
value and one component (R-Y or B-Y) of the chroma values. This means: a half
sized color image per field is reconstructed. After deinterlacing the image has
the properties of a 4:2:2 image.
Format_7 Mode_1: sensor readout and color
In Format_7 Mode_1 controlling gain is done digitally for each of the four chan-
nels Cyan, Yellow, Magenta and Green.
Because it is not possible to obtain full color or chroma information per field, the
data has to be deinterlaced first. After that demosaicing is done (see Chapter
How demosaicing works on page 85): luma (Y) and the two chroma values (R-Y
and B-Y) are calculated from each 2x2 pixel array.
Figure 53: Format_7 Mode_1: 1st field and 2nd field
Figure 54: Format_7 Mode_1: Sensor readout
G Mg G Mg G Mg G Mg
Cy Ye Cy Ye Cy Ye Cy Ye
Mg G Mg G Mg G Mg G
Cy Ye Cy Ye Cy Ye Cy Ye
G Mg G Mg G Mg G Mg
Cy Ye Cy Ye Cy Ye Cy Ye
Mg G Mg G Mg G Mg G
Cy Ye Cy Ye Cy Ye Cy Ye
Sensor Bayer pattern 1st field 2nd field
G Mg
Mg G Cy Ye
1st field
G Mg
Cy Ye Cy Ye Y R-Y B-Y
Mg GYR-YB-Y
Cy Ye Y R-Y B-Y
2nd field