JVC GR-DVA10 Technical Manual page 17

2. AW (Auto White balance) control
AW control compensates the Red component gain and Blue component gain shown in the camera block
diagram to keep the white balance in the camera picture under every kind of light source.
Basic input data for AW control are three of the following.
(1) R, G, B levels of sections divided a picture into 48 sections.
(2) Data on existence/absence of infrared rays in the light source. This data is used for judging the
sort of the light source.
(3) Illumination judged with the exposure compensation parameters (iris/ AGC gain/ shutter speed).
The white balance is controlled by the following setting referring to the R, G, B data on the section that is
judged as a white (uncolored) part of the picture according to the three kinds of data mentioned above.
Red component gain = Green level / Red level
Blue component gain = Green level / Blue level
Besides the white balance control, balance among color phases is controlled by the parameter control in
the color signal processing from RGB to C signal depending on the light source.
1) Light source judging process
IR
DC component
Yes
Yes
Yes
Yes
No
No
No
No
FLICKER
AC component
Yes
Yes
No
No
Yes
Yes
No
No
Table 2-3-1 Light source judging process
2-11
BRIGHT
(Over 4000 Lx)
Yes
No
Yes
No
Yes
No
Yes
No
∗ : OUT DOOR or HAROGEN (not FL LIGHT)
LIGHT
SOURCE
HAROGEN
∗
OUT DOOR
OUT DOOR
FL LIGHT
FL LIGHT
FL LIGHT
FL LIGHT