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)： 14/102頁(yè)
文件大?。?/td> 282K
代理商： ΜSAP70300-B03
4
μ
SAP703000-B03 USER'S MANUAL
(3) Sampling and MCU
The minimum unit in which JPEG processing is performed is called an MCU (minimum coded unit). The
MCU is separated into Y/Cb/Cr in units of 8 x 8 pixels, each of which is called a block.
Obtaining four blocks of Y, one block of Cb, and one block of Cr from one MCU can be expressed as a
“sampling ratio of 4:1:1.” Similarly, when obtaining two blocks of Y, one block of Cb, and one block of
Cr from one MCU, the sampling ratio is said to be 4:2:2. When obtaining one block each of Y, Cb, and
Cr from one MCU, the sampling ratio is 4:4:4.
Table 1-1. Sampling Ratio and MCU
MCU
Sampling ratio
Block
Vertical 16 pixels
Horizontal 16 pixels
4:1:1
(H:V = 2:2)
Y: 4 blocks
Cb: 1 block, Cr: 1 block
Vertical 8 pixels
Horizontal 32 pixels
4:1:1
(H:V = 4:1)
Y: 4 blocks
Cb: 1 block, Cr: 1 block
Vertical 8 pixels
Horizontal 16 pixels
4:2:2
Y: 2 blocks
Cb: 1 block, Cr: 1 block
Vertical 8 pixels
Horizontal 8 pixels
4:4:4
Y: 1 block
Cb: 1 block, Cr: 1 block
Although the JPEG standard covers sampling ratios other than those listed in Table 1-1, the AP703000-
B03 supports only those sampling ratios listed in the table.
JPEG compression starts by dividing the image in this MCU units into grids. Conversely, JPEG expansion
involves arranging the processing result for each MCU in a manner exactly like paving a floor with tiles.
For example, an image is vertically and horizontally divided into 16-pixel units, each at a sampling ratio
of 4:1:1 (H:V = 2:2). Next, the 16 x 16 pixel image is separated into Y, Cb, and Cr components, and the
Y component is divided into four blocks, each block consisting of 8 x 8 pixels. For the Cb and Cr
components, an 8 x 8 pixel image is created from the 16 x 16 pixel image. At this time, the vertically and
horizontally adjacent 4 pixels are averaged. This is called “thinning out.”
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