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
文件頁數(shù)： 25/102頁
文件大小： 282K
代理商： ΜSAP70300-B03
15
CHAPTER 1 OVERVIEW
There are eight types of restart markers, in the value range of 0xFF,0xD0 to 0xFF,0xD7. A restart marker
is inserted in a compressed code every m MCUs, and used in the order of RST0, RST1, and RST2 to
RST7. Following RST7, RST0 is used. The value of m is called the restart interval.
If the restart interval is 3, the image will be as shown in the figure below.
Figure 1-14. Restart Marker
The number of restart markers to be inserted is determined by the size of the image. For example, the
number of restart markers for an image measuring 640 x 480 pixels, for a sampling ratio of 4:2:2 and a
restart interval of 2, is calculated as follows:
MCU (minimum compression unit): 16 x 8 pixels
Restart marker:
Therefore,
(640 x 480)
÷
(16 x 8)
÷
2 = 1200 restart markers
every 2 MCUs
RST0
FF, D0
RST1
FF, D1
RST2
FF, D2
RST3
FF, D3
RST4
FF, D4
RST5
FF, D5
RST6
FF, D6
RST7
FF, D7
RST0
FF, D0
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