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PDF JE360 Data sheet ( Hoja de datos )
| Número de pieza | JE360 | |
| Descripción | (JE300 - JE360) JPEG Baseline Encoder IP-Core Users Manual | |
| Fabricantes | Penz VHDL | |
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Hay una vista previa y un enlace de descarga de JE360 (archivo pdf) en la parte inferior de esta página. Total 45 Páginas | ||
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Free Datasheet http://www.0PDF.com
JE300, JE310,
JE350 and JE360
JPEG Baseline Encoder IP-Core
Users Manual
Rev 3.0
© by Penz VHDL
Frankenstr. 16
D-55299 Nackenheim
Germany
www.penz-vhdl.de
1 page  
Penz VHDL
Free Datasheet http://www.0PDF.com
JE300, JE310, JE350 and JE360
1. The JPEG Baseline Encoding Standard
The JPEG standard defines four modes of operation:
• Sequential DCT-based
• Progressive DCT-based
• Hierarchical
• Sequential lossless
The most used mode is the Sequential DCT-based, also known as Baseline mode.
The following overview describes the Baseline encoding standard.
Figure 1: JPEG Encoding Structure
8x8 Blocks
8x8
2D-DCT
Zigzag
Order
Quantizier Entropy
Encoder
Source
Image Data
JPEG Baseline Encoder
Typical compress rates are values from 10 to 15.
Bit-Stream
Compressed
Image Data
1.1 Level Shift
The image samples must be in the two’s complement format with a size of 8 bit. If the
samples are in integer format, a value of 80h (800h with 12 bit precision) must be
subtracted.
1.2 Blocks
The complete image is divided into 8x8 blocks, starting in the top left row. The blocks
are read out in the same order, beginning in the top left corner to the top right corner,
and then continuing the next eight rows until all done. If the number of pixels / lines
are not a multiple of 8, the last pixel / line is repeated until the block is completed.
Any extra pixels / lines are discarded by the decoding process.
5
5 Page 
Penz VHDL
Free Datasheet http://www.0PDF.com
JE300, JE310, JE350 and JE360
2. The JPEG File Format
The JPEG file is assembled of segments. Each segment has a Header with the
marker and when further parameter, a segment length. A marker is a two byte code
with the first byte always FFh and the second byte unequal zero. Integer values are
high significant byte first arranged.
A typical JPEG file segment structure is SOI, DQT, SOF, DHT, SOS and EOI.
The following description shows only those segments, where needed by the mono
chrome and color (4:2:2) baseline encoding. Some others modes have more
segments, or the segment parameters has another meaning.
2.1 SOI Start of Image
The Start Of Image segment defines the beginning of an image and has no further
parameter.
SOI marker
16 bit xx, xx FFh, D8h
2.2 DQT Define Quantization Table
The Define Quantization Table segment defines the Quantization tables, used by the
encoder. The table elements are in Zigzag order.
DQT marker
Segment length
16 bit xx, xx FFh, DBh
16 bit xx, xx 2 + num tables * 65
For each table:
Table precision
Table identifier
Table elements
4 bit x
0
4 bit xx
0 for luminance, 1 for chrominance
64 x 8 bit xx, ... , xx
11
11 Page | ||
| Páginas | Total 45 Páginas | |
| PDF Descargar | [ Datasheet JE360.PDF ] | |
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