參數(shù)資料
型號(hào)： μSAP70300-B03
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8 Bit Single Chip Microcontrollers
中文描述： 8位單片機(jī)微控制器
文件頁(yè)數(shù)： 12/102頁(yè)
文件大?。?/td> 282K
代理商： ΜSAP70300-B03
2
μ
SAP703000-B03 USER'S MANUAL
1.2.1 Overview
There are several versions of the JPEG standard, such as progressive JPEG, in which an outline of the
image appears first, detail being added subsequently. Lossless JPEG can completely restore an image to
the state existing before compression. These versions, however, are not in general use. The AP703000-
B03 supports only the most commonly used version, called Baseline DCT.
Figure 1-2. JPEG Versions
(1) Flow of JPEG processing
JPEG compression involves compressing data in three steps:
<1>
DCT,
<2>
quantization, and
<3>
entropy compression. JPEG expansion involves reproducing a compressed image by applying the reverse
of the above procedure:
<1>
entropy expansion,
<2>
reverse quantization, and
<3>
reverse DCT.
Figure 1-3. JPEG Processing
DCT (discrete cosine transform) processing involves the disassembly of frequencies. Quantization
reduces the volume of information by eliminating, from the data obtained as a result of DCT (i.e., data
whose frequency has been disassembled), those frequency components that humans cannot sense.
Entropy encoding is generally known as reversible compression/expansion, while baseline DCT uses a
technology based on Huffman encoding.
The AP703000-B03 performs DCT and quantization as part of the same function. Similarly, entropy
decoding and reverse quantization are performed as part of the same function. This increases the
processing speed.
Compression
DCT
Quantization
Entropy coding
Reverse DCT
Reverse
quantization
Entropy decoding
Expansion
I
J
JPEG
Baseline Process
DCT
Sequential
Huffman
Extended DCT-based Process
DCT
Sequential or progressive
Huffman or arithmetic coding
Lossless Process
Sequential
Huffman or arithmetic coding
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