- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363910 > W99681CF (WINBOND ELECTRONICS CORP) JPEG USB Dual Mode Camera Chip(運用JPEG壓縮技術(shù)、通用串行總線結(jié)構(gòu)技術(shù)、雙制式的照相電路數(shù)字處理芯片的攝像照相機(jī)接口控制器) PDF資料下載
參數(shù)資料
| 型號： | W99681CF |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | JPEG USB Dual Mode Camera Chip(運用JPEG壓縮技術(shù)、通用串行總線結(jié)構(gòu)技術(shù)、雙制式的照相電路數(shù)字處理芯片的攝像照相機(jī)接口控制器) |
| 中文描述： | JPEG格式相機(jī)的USB雙模芯片（運用的JPEG壓縮技術(shù)，通用串行總線結(jié)構(gòu)技術(shù)，雙制式的照相電路數(shù)字處理芯片的攝像照相機(jī)接口控制器） |
| 文件頁數(shù)： | 26/78頁 |
| 文件大小： | 816K |
| 代理商： | W99681CF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當(dāng)前第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁
W99681CF
- 26 -
7.3.3 Huffman Encoding
After quantization, the quantized coefficients are converted to the zig-zag sequence for Huffman
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 W99681CF 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 W99681CF 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(guān)PDF資料 |
PDF描述 |
|---|---|
| W9971CF | Integrated Video Graphics Accelerator(集成的視頻圖形加速器) |
| W9980 | Digital Voice Recorder(數(shù)字式錄音器) |
| WA08-2433A | 820-980 MHz LOW NOISE BALANCE AMPLIFIER WA08-2433A |
| WA0805ML180A | Multilayer Ceramic Transient Voltage Suppressors for Automotive Applications |
| WA1206ML180A | Multilayer Ceramic Transient Voltage Suppressors for Automotive Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| W9986D | 制造商:WINBOND 制造商全稱:Winbond 功能描述:MPEG Audio Layer III Decoder |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。