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參數(shù)資料
| 型號(hào)： | BT849A |
| 英文描述： | Single-Chip Video Capture for PCI |
| 中文描述： | 單芯片的PCI視頻捕捉 |
| 文件頁(yè)數(shù)： | 51/141頁(yè) |
| 文件大?。?/td> | 1149K |
| 代理商： | BT849A |
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Brooktree
41
F
UNCTIONAL
D
ESCRIPTION
Video Data Format Conversion
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
YCrCb to RGB
Conversion
The 4:2:2 YCrCb data stream from the video decoder portion of the Bt848 must be
converted to 4:4:4 YCrCb before the RGB conversion occurs, using an interpola-
tion filter on the chroma data path. The even valid chroma data pass through un-
modified, while the odd data is generated by averaging adjacent even data. The
chroma component is upsampled using the following equations:
For n = 0, 2, 4, etc.
Cb
n
= Cb
n
Cr
n
= Cr
n
Cb
n+1
= (Cb
n
+ Cb
n+2
)/2
Cr
n+1
= (Cr
n
+ Cr
n+2
)/2
RGB Conversion:
R = 1.164(Y–16) + 1.596(Cr–128)
G = 1.164(Y–16) – 0.813(Cr–128) – 0.391(Cb–128)
B = 1.164(Y–16) + 2.018(Cb–128)
Y range = [16,235]
Cr/Cb range = [16,240]
RGB range = [0,255]
Gamma Correction
Removal
Bt848 provides gamma correction removal capability. The available gamma values
are:
NTSC: RGBout = RGBin
2.2
PAL: RGBout = RGBin
2.8
Gamma correction removal capability is not programmable on a field basis.
Furthermore, gamma correction removal is not available when YCrCb data is out-
put.
YCrCb Sub-sampling
The 4:2:2 data stream is horizontally sub-sampled to 4:1:1 using the following
equations:
For n = 0, 4, 8, etc.:
Cb
n
= (Cb
n
+ Cb
n+2
)
Cr
n
= (Cr
n
+ Cr
n+2
)
Vertical sub-sampling is supported by Bt848’s YUV9 and YUV12 planar
modes. In these modes, the video data is first planarized and placed in the FIFO as
4:2:2 planar or 4:1:1 planar data. The FIFO data is then vertically sub-sampled to
4:1:1 for YUV9 and 4:2:2 for YUV12 formats. The vertical sub-sampling is per-
formed via RISC instructions that are executed by the DMA controller.
Table 7 shows an example of a 4 pixel line for YUV9 and YUV12 formats. In
the YUV12 format. Line 2 of Cr/Cb data is discarded and hence 4:2:2 vertical
sub-sampling is achieved. In the YUV9 format, lines 2–4 of Cr/Cb data are dis-
carded and hence 4:1:1 vertical sub-sampling is achieved.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BT849AKPF | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Single-Chip Video Capture for PCI |
| BT850-SA | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
| BT850-SA-T/R | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:2,500 |
| BT850-ST | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
| BT850-ST-T/R | 功能描述:BTV4.2 DUAL MODE USB HCI MODULEE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:2,500 |
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