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参数资料
| 型号： | TMC2272AH5C2 |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | DSP Peripheral |
| 英文描述： | 12-BIT, DSP-VIDEO IMAGING, PPGA120 |
| 封装： | PLASTIC, PGA-120 |
| 文件页数： | 2/20页 |
| 文件大小： | 170K |
| 代理商： | TMC2272AH5C2 |
PRODUCT SPECIFICATION
TMC2272A
10
REV. 1.1.3 10/25/00
Switching Characteristics
Parameter
Conditions
Min
Typ
Max
Units
tDO
Output Delay Time
CLOAD = 25 pF
15
ns
tHO
Output Hold Time
CLOAD = 25 pF
3
ns
Applications Discussion
The TMC2272A can convert between any two three-coordinate
colorspaces with the selection of the proper coefficients. Sets
of coefficients for some popular colorspace conversions are
presented below.
By concatenating coefcient matrices of single transforma-
tions, the user can program the TMC2272A to perform
compound transforms efciently. For example, given an
RGB input, correction of the relative values of R and B, for
color temperature, conversion to YIQ, modication of
contrast by changing Y, and conversion back to RGB can be
performed as quickly and easily as any simple transformation.
To calculate the nal set of coefcients from the coefcients
of the individual transformations, the procedure in Figure 7
(concatenation) is used. If more than two matrices are to be
combined, the result from the concatenation of the rst two
matrices is concatenated with the third. If more matrices
must be incorporated in the nal function, the last step is
repeated.
Figure 7. Concatenation
AB
C
DE
F
GH
I
JK
L
MN
O
PQ R
AJ + BM + CP
DJ + EM + FP
GJ + HM + IP
AK + BN + CQ
DK + EN + FQ
GK + HN + IQ
AL + BO + CR
DL + EO + FR
GL + HO + IR
=
Converting from GBR to YCBCR
With the right coefficients, two external NOT gates, and an
external 4-bit half-adder, the TMC2272A can convert video
data from 8-bit full-scale (e.g. VGA) GBR components to 10-
bit YCBCR components.
Table 3. 10-bit component formats and
inclusive ranges.
The analog dening equations for 1 Volt luminance and ±0.5
Volt color difference components are:
Y = + 0.5870 (G) + 0.1140 (B) + 0.2990 (R)
B – Y = – 0.3313 (G) + 0.5000 (B) – 0.1687 (R)
R – Y = – 0.4187 (G) – 0.0813 (B) + 0.5000 (R)
To translate these equations into the digital domain, note that
the ranges of R, G, and B are 0 to 255 instead of 0 to 1, the
range of Y is 64 to 940 instead of 0 to 1, and the ranges of U
and V are 64 to 960 instead of +/-0.5:
Y
= (876/255)(0.587(G)+0.114(B)+0.299(R))+64
= 2.01652 (G)+0.39162(B)+1.02715(R) +64
CB = (896/255)(0.3313(G)+0.5(B)-0.1687(R))+512
= -1.16397(G)+1.75686(B)-0.59289(R)+512
CR = (896/255)(-0.4187(G)-0.0813(B)+0.5(R))+512
= -1.47115(G)-0.28571(B)+1.75686(B))+512
Let Y'=Y-64, U'=CB-512, and V'=CR - 512. The TMC2272A
will compute Y', U', and V'. Adding 64 (040h) externally to Y'
will then yield Y, whereas inverting the most signicant bits of
U' and V', U'9 and V'9, will yield CB and CR, respectively.
Multiplying the equations immediately above by 128 and
rounding each coefcient to the nearest integer yields the rec-
ommended set of coefcients for GBR to YUV conversion.
Color Space Term
Range
Format
Y
Luminance
64-940
magnitude
Y'
Y - 64
0-876
magnitude
CB
Color difference,
Blue
64-960
magnitude
U'
CB - 512
±448
2’s comp
CR
Color difference,
Red
64-960
magnitude
V'
CR - 512
±448
2’s comp
GBR
Green, Blue, Red
components
0-255
magnitude,
8-bits
相关PDF资料 |
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|---|---|
| TMC2272AH5C | 12-BIT, DSP-VIDEO IMAGING, PPGA120 |
| TMC2272AKEC2 | 12-BIT, DSP-VIDEO IMAGING, PQFP120 |
| TMC2272AKEC | 12-BIT, DSP-VIDEO IMAGING, PQFP120 |
| TMC2272AH5C3 | 12-BIT, DSP-VIDEO IMAGING, PPGA121 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TMC2272AH5C3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TMC2272AH6C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TMC2272AH6C2 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Digital Colorspace Converter 36 Bit Color, 50 MHz |
| TMC2272AH6C3 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Digital Colorspace Converter 36 Bit Color, 50 MHz |
| TMC2272AKEC | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Digital Colorspace Converter 36 Bit Color, 50 MHz |
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