ALLIED Vision Technologies Guppy F-503 - Manual (Page 111)

Description of the data path
GUPPY Technical Manual V7.1.0
111
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.