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參數(shù)資料
| 型號： | ZR36060 |
| 廠商： | Zoran Corporation |
| 元件分類： | Codec |
| 英文描述： | Integrated JPEG Codec(集成JPEG編解碼器) |
| 中文描述： | 綜合JPEG編解碼器（集成的JPEG編解碼器） |
| 文件頁數(shù)： | 14/46頁 |
| 文件大?。?/td> | 307K |
| 代理商： | ZR36060 |
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Integrated JPEG CODEC
3.4.4 Vertical up-scaling in decompression
As in compression, this is specified by VScale
VScale = 0b: No up-scaling
VScale = 1b:2:1 interpolation, by line replication
3.5 Active Area Size Restrictions
The maximum allowed size for the active area rectangle is 768
pixels x 64K lines.
The ZR36060 JPEG codec always processes an image with
dimensions of 2*8*x and 8*y pixels. This is because of the YUV
4:2:2 format, where the MCU is 2 blocks of Y, 1 block of U and 1
block of V. The active area of the video interface must be config-
ured to reflect the dimensions before down-scaling in
compression, and after up-scaling in decompression. show the
resulting restrictions imposed on the dimensions of the active
area.
In the internal sampling scheme, the first chrominance sample is
always assumed to be a U (Cb) sample. This is directly con-
trolled by the Hstart parameter. Hstart must be programmed to
an appropriate value (even or odd) in order for the ZR36060 to
sample first the U (Cb) pixel, otherwise U-V inversion occurs.
3.6 Spatial Mix of Video Streams
The ZR36060 is capable of spatially mixing (multiplexing) two
video sources for compression, and also of multiplexing the
ZR36060 output video with another video source during decom-
pression. The latter is a useful feature for video editing, e.g. to
superimpose titles or subtitles onto the images.
The SUBIMG output signal creates a sub-image rectangle
defined by the SHstart, SHend, SVstart, SVend parameters,
where one image is outside and the other one is inside the rect-
angle (see Figure 10). In compression, this signal can be
connected, for example, to two synchronized sources of live
video to multiplex their outputs. Some digital video sources have
a video bus which can be placed in a floating state (for example,
the Philips SAA7110 video digitizer/decoder); SUBIMG can be
used to float this bus while enabling a second video source.
Some possible options are to multiplex two video decoders, one
decoder and one field memory, one video decoder and one
MPEG decoder, etc.
There are several inherent problems in mixing video that the
system designer must consider:
The two video sources must be synchronized. This means
that pixel clocks, horizontal and vertical timing must come
from only one source which is the sync master.
Both video sources must work in the same mode (16-bit or 8-
bit).
The SHstart and SHend parameters must be such that the
boundaries of the subimage rectangle (where SUBIMG
changes state) are exactly at the boundary between inde-
pendent YUV 4:2:2 units (units of two VCLKs, containing
related U and V samples) for both sources.
To permit video mixing during decompression (playback), the
SUBIMG output can be externally connected to the POE input.
This way, the ZR36060 places its video data only within (or
outside) the rectangle defined by SUBIMG, floating the output
video bus outside (or inside) the boundaries (see Figure 11). The
polarity of the SUBIMG signal is defined by the SImgPol param-
eter, and the polarity of the POE signal (to place ZR36060 data
inside or outside the rectangle during playback) is defined by
PoePol parameter. In Figure 11, the polarity of SUBIMG has
been chosen so as to float the video bus outside the subimage
rectangle.
Note that SUBIMG and POE operate independently of each
other, so they can also be used separately.
Table 2: Active Area, Horizontal Dimension (HEnd -
HStart)
Horizontal scaling
Restriction
No scaling (1:1)
Multiple of 16
2:1
Multiple of 32
4:1
Multiple of 64
Table 3: Active Area, Vertical Dimension (VEnd -
VStart)
Vertical Scaling
Restriction
No scaling (1:1)
Multiple of 8
2:1
Multiple of 16
Figure 10. Subimage Parameters In Compression
HSYNC
V
Source 1
SHstart
SHend
S
S
Source 2
Active Area
Rectangle
Subimage
Rectangle
相關PDF資料 |
PDF描述 |
|---|---|
| ZR36060 | Circular Connector; No. of Contacts:19; Series:; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:14; Circular Contact Gender:Socket; Circular Shell Style:Cable Receptacle; Insert Arrangement:14-19 |
| ZR36060PQC | Integrated JPEG CODEC |
| ZR36067 | AV PCI CONTROLLER |
| ZR36067PQC | AV PCI CONTROLLER |
| ZR36067 | PCI Adapter Intended for Multimedia Applications on PCI Systems(PCI（外圍部件互連）適配器（用于PCI系統(tǒng)的多媒體）) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ZR36060PQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Integrated JPEG CODEC |
| ZR36060PQC-27 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| ZR36060PQC-29.5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| ZR36067 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AV PCI CONTROLLER |
| ZR36067PQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AV PCI CONTROLLER |
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