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參數(shù)資料
| 型號： | ZR36050 |
| 廠商： | Zoran Corporation |
| 英文描述： | JPEG Image Compression Processor(JPEG 圖象壓縮處理器) |
| 中文描述： | JPEG圖像壓縮處理器（JPEG格式圖象壓縮處理器） |
| 文件頁數(shù)： | 2/52頁 |
| 文件大小： | 262K |
| 代理商： | ZR36050 |
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ZR36050
2
ADVANCE INFORMATION
In addition to the JPEG Baseline, the ZR36050 supports a
subset of JPEG Lossless standard. The ZR36050 performs one
dimensional differential prediction followed by variable-length
encoding for JPEG Lossless compression, and the correspond-
ing inverse operations for JPEG Lossless expansion.
The ZR36050 maintains full compatibility with the JPEG
Baseline standard. The unique ability to perform bit rate control.
Bit rate control capability allows the user to preset the size of a
compressed image file. This capability is important because
without bit rate control, the size of a compressed image is highly
data dependent for a given set of quantization tables (images
with fine detail generate considerably larger files than files gen-
erated from smooth images).
The ability to perform bit rate control is critical for applications
where predictable file sizes for compressed images is desired, or
where the time allocated to transmit an image across a commu-
nications network is fixed. The compressed image file size is
constrained to be no greater than a user specified target, and is
typically kept within a range of 95% to 100% of this target. The
bit rate control feature relies on a two pass algorithm for its
operation.
The ZR36050 has the ability to generate a “thumbnail” version of
an image for “Fast Preview.” This thumbnail image is a 1/64
scale version of the image, and is generated up to 25 times
faster than full image expansion. The thumbnail image is gener-
ated from the JPEG Baseline compressed data, and eliminates
the need for a separately encoded and stored thumbnail image.
This feature is particularly useful for previewing large databases
of images.
The ZR36050 operates as a dedicated processor requiring only
minimal host intervention. The host processor controls the oper-
ation of the device by writing parameter values into the
ZR36050’s Internal Memory. Once initialized, the ZR36050
operates continuously until it has completed the compression or
expansion of the image. Since the ZR36050 fully complies with
the JPEG Baseline standard, the compressed data bit-stream
generally requires no intervention by the host. Full JPEG capa-
bility also allows for the interchange of files created by other
JPEG imaging systems with files generated by systems using
the ZR36050.
The ZR36050 is useful for a wide range of motion and still video appli-
cations. For example, a typical multimedia application (30 seconds of
video at 10 frames/sec and 320 x 240 resolution) would require 69
Mbytes of storage in uncompressed form. With compression using the
ZR36050, the requirement can be reduced to 2.9 Mbytes, making
storage feasible on a personal computer hard disk. Similarly, for digital
still camera applications, the memory requirement can be reduced
from a 22 Mbyte hard disk to a 1 Mbyte memory card for storage of
twenty 768 x 480 compressed images.
The ZR36050 is fabricated with an advanced low-power CMOS
technology, making it suitable for use in low-power, cost-sensi-
tive applications. The device is available in a 100-pin Plastic
Quad Flat Pack (PQFP).
相關(guān)PDF資料 |
PDF描述 |
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| ZR36060 | Integrated JPEG Codec(集成JPEG編解碼器) |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZR36050PQC-21 | 制造商:ZORAN 功能描述: |
| ZR36050PQC27 | 制造商:ZORAN 功能描述:* |
| ZR36050PQC-27 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:JPEG IMAGE COMPRESSION PROCESSOR |
| ZR36050PQC-29.5 | 制造商:Zoran Corp 功能描述:Peripheral IC |
| ZR36053TQC15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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