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ADV7195
FILTER GAIN
FG (FG7–FG0)
(Address (SR4–SR0) = 10H)
Figure 34 shows the various operations under the control of the
Filter Gain register.
The response of the curve is programmed at seven predefined
locations. In changing the values at these locations the gamma
curve can be modified. Between these points linear interpola-
tion is used to generate intermediate values. Considering the
curve to have a total length of 256 points, the seven locations
are at: 32, 64, 96, 128, 160, 192, 224.
FG7
FG6
FG5
FG4
FG3
FG2
FG1
FG0
Locations 0, 16, 240, and 255 are fixed and cannot be changed.
FG7 – FG4
FILTER GAIN B
FG3 – FG0
FILTER GAIN A
For the length of 16 to 240 the gamma correction curve has to
be calculated as below:
y = x γ
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0
1
2
3
4
5
6
7
– 8
– 7
– 6
– 5
– 4
– 3
– 2
– 1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0
1
2
3
4
5
6
7
– 8
– 7
– 6
– 5
– 4
– 3
– 2
– 1
where
y = gamma corrected output.
x = linear input signal.
γ = gamma power factor.
To program the gamma correction registers, the seven values
for y have to be calculated using the following formula:
y n = [ x ( n –16) /(240 – 16)] γ × (240–16) + 16
where
x (n–16) = Value for x along x-axis at points:
Figure 34. Filter Gain Register
n
y n
= 32, 64, 96, 128, 160, 192, or 224.
= Value for y along the y-axis, which has to be written
FG BIT DESCRIPTION
Filter Gain A (FG3–FG0)
These bits are used to program the gain A value, which varies
from response –8 to response +7 and are applied to Filter A.
Filter Gain B (FG4–FG7)
These bits are used to program the gain B value, which varies
from response –8 to response +7, and are applied to Filter B.
Refer to Sharpness Filter Control and Adaptive Filter Control
section for more detail.
GAMMA CORRECTION REGISTERS 0–13
into the gamma correction register.
Example:
y 32 = [(16/224) 0.5 × 2 24] + 16 = 76 *
y 64 = [(48/224) 0.5 × 224] + 16 =120 *
y 96 = [(80/224) 0.5 × 224] + 16 = 150 *
y 128 = [(112/224) 0.5 × 224] + 16 = 174 *
* Rounded to the nearest integer.
The above will result in a gamma curve shown on the next
page, assuming a ramp signal as an input.
300
(GAMMA CORRECTION 0–13)
(Address (SR5–SR0) = 14H–21H)
The Gamma Correction Registers are 14 8-bit-wide registers.
They are used to program the gamma correction Curves A and B.
250
200
GAMMA CORRECTION BLOCK OUTPUT
TO A RAMP INPUT
SIGNAL OUTPUT
Generally, gamma correction is applied to compensate for the
nonlinear relationship between signal input and brightness
level output (as perceived on the CRT). It can also be applied
wherever nonlinear processing is used.
Gamma correction uses the function:
150
100
0.5
Signal OUT = (S ignal IN ) γ
where γ = gamma power factor.
50
SIGNAL INPUT
Gamma correction is performed on the luma data only.
0
0
50
100
150
LOCATION
200
250
The user has the choice of two different curves, Curve A or
Curve B. At any one time only one of these curves can be used.
REV. A
–21 –
Figure 35. Signal Input (Ramp) and Signal Output for
Gamma 0.5
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