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參數資料
型號： W9967BCF
廠商： WINBOND ELECTRONICS CORP
英文描述： JPEG USB Camera Chip(運用JPEG壓縮技術和通用串行總線結構技術的照相電路數字處理芯片的攝像照相機接口控制器)
中文描述： USB相機的JPEG芯片（運用的JPEG壓縮技術和通用串行總線結構技術的照相電路數字處理芯片的攝像照相機接口控制器）
文件頁數： 25/72頁
文件大?。?/td> 756K
代理商： W9967BCF
W9967BCF
Publication Release Date: March 2000
- 25 - Revision A1
encoding. The DC coefficients are coded differently from the AC coefficients. The value that should be
encoded is the difference (DIFF) between the quantized DC coefficient of the current block (DC
i
which
is also designated as Sq
00
) and that of the previous block of the same component (PRED):
DIFF
DC
PRED
i
=
At the beginning of the scan and at the beginning of each restart interval, the prediction for the DC
coefficient prediction is initialized to 0.
For the AC coefficient encoding, since many AC coefficients are zero, runs of zeros are identified and
coded efficiently. In addition, if the remaining coefficients in the zig-zag sequence order are all zero, this
is coded explicitly as an end-of-block (EOB).
The W9967BCF Huffman encoder employs two DC and two AC Huffman tables within one scan for
luminance and chrominance components.
7.3.4 JPEG Encoding Order
The W9967BCF JPEG encoder supports two non-interleaved encoding orders shown in Figure 7.2:
YUV4:2:2 non-interleaved encoding order
YUV4:2:0 non-interleaved encoding order
Y
1
, Y
, ...Y
n
Scan 1
YUV4:2:2 Non-interleaved Encoding Order
Y
1
Y
2
Y
n
U
1
U
2
U
n/2
V
1
V
2
V
n/2
Y
1
Y
2
Y
n
U
1
U
2
U
n/4
V
1
V
2
V
n/4
U
1
, U
, ...U
n/2
Scan 2
V
1
, V
, ...V
n/2
Scan 3
U
3
V
3
Y
3
Y
4
Y
3
Y
4
Y
1
, Y
, ...Y
n
Scan 1
YUV4:2:0 Non-interleaved Encoding Order
U
1
, U
, ...U
n/4
Scan 2
V
1
, V
, ...V
n/4
Scan 3
Figure 7.2 JPEG Encoding Order
相關PDF資料
PDF描述
W9967CF JPEG USB Camera Chip(運用JPEG壓縮技術和通用串行總線結構技術的照相電路數字處理芯片的攝像照相機接口控制器)
W99681CF JPEG USB Dual Mode Camera Chip(運用JPEG壓縮技術、通用串行總線結構技術、雙制式的照相電路數字處理芯片的攝像照相機接口控制器)
W9971CF Integrated Video Graphics Accelerator(集成的視頻圖形加速器)
W9980 Digital Voice Recorder(數字式錄音器)
WA08-2433A 820-980 MHz LOW NOISE BALANCE AMPLIFIER WA08-2433A
相關代理商/技術參數
參數描述
W99681CF 制造商:WINBOND 制造商全稱:Winbond 功能描述:JPEG USB Dual Mode Camera Chip
W99685 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
W99685BS 制造商:WINBOND 制造商全稱:Winbond 功能描述:SYSTEM CAMERA DEVICE
W99685FS 制造商:WINBOND 制造商全稱:Winbond 功能描述:SYSTEM CAMERA DEVICE
W9968CF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Camera
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