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| 型號： | ADV7194 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Professional Extended-10⑩ Video Encoder with 54 MHz Oversampling |
| 中文描述： | 專業(yè)擴展- 10⑩視頻編碼器，54兆赫采樣 |
| 文件頁數(shù)： | 43/69頁 |
| 文件大小： | 647K |
| 代理商： | ADV7194 |
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ADV7194
–43–
REV. 0
GAMMA CORRECTION REGISTERS 0–13 (GAMMA
CORRECTION 0–13)
(Address (SR5–SR0) = 26H–32H)
The Gamma Correction Registers are fourteen 8-bit-wide regis-
ter. They are used to program the gamma correction Curves A
and B.
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 wher-
ever nonlinear processing is used.
Gamma correction uses the function:
Signal
OU
T
= (S
ignal
IN
)
γ
where
γ
=
gamma power factor
Gamma correction is performed on the luma data only. The
user has the choice to use two different curves, Curve A or
Curve B. At any one time only one of these curves can be used.
The response of the curve is programmed at seven prede
fi
ned
locations. In changing the values at these locations the gamma
curve can be modi
fi
ed. Between these points linear interpolation
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, and 224.
Location 0, 16, 240 and 255 are
fi
xed and can not be changed.
For the length of 16 to 240 the gamma correction curve has to
be calculated as below:
y
=
x
γ
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 n = 32, 64, 96, 128,
160, 192 or 224
y
n
= Value for y along the y-axis, which has to be written
into the gamma correction register
Example:
DNR27
DNR26
DNR25
DNR24
DNR23
DNR22
DNR21
DNR20
BLOCK OFFSET CONTROL
DNR DNR DNR DNR
27 26 25 24
0
0
0
0
0
0
1
1
1
1
1
1
0
0
1
0
1
1
0
1
0
1
0
1
0 PIXEL OFFSET
1 PIXEL OFFSET
2 PIXEL OFFSET
13 PIXEL OFFSET
14 PIXEL OFFSET
15 PIXEL OFFSET
DNR INPUT SELECT CONTROL
DNR DNR DNR
22 21 20
0
0
0
1
0
1
1
0
1
0
1
0
FILTER A
FILTER B
FILTER C
FILTER D
0
1
DNR MODE
DNR
SHARPNESS
MODE
DNR23
DNR MODE
CONTROL
Figure 90. DNR Register 2
y
32
= [(16/224)
0.5
×
224] + 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 below, assuming
a ramp signal as an input.
250
200
150
100
50
0
300
250
200
150
100
50
300
SIGNAL OUTPUT
SIGNAL INPUT
0.5
GAMMA CORRECTION BLOCK OUTPUT
TO A RAMP INPUT
G
0
50
100
150
200
250
LOCATION
Figure 91. Signal Input (Ramp) and Signal Output for
Gamma 0.5
250
200
150
100
50
0
300
SIGNAL OUTPUTS
SGNALINPUT
0.5
GAMMA CORRECTION BLOCK OUTPUT
TO A RAMP INPUT FOR VARIOUS GAMMA VALUES
G
0
50
100
150
200
250
LOCATION
0.3
1.5
1.8
Figure 92. Signal Input (Ramp) and Selectable Gamma
Output Curves
The gamma curves shown above are examples only, any user
de
fi
ned curve is acceptable in the range of 16
–
240.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7194KST | 制造商:Analog Devices 功能描述:Video Encoder 6DAC 10-Bit 80-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:PROFESSIONAL/HDTV NTSC/PAL ENCODER I.C. - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER |
| ADV7194KSTZ | 功能描述:IC ENCODER VIDEO EXT-10 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7194KSTZ | 制造商:Analog Devices 功能描述:TV / Video IC |
| ADV7195 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input |
| ADV7195KS | 制造商:Analog Devices 功能描述:Video Encoder 3DAC 11-Bit 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:MULTI-FORMAT VID+PROGSCAN/HDTV ENCODERIC - Bulk |
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