參數(shù)資料
型號(hào): μSAP70732-B03
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 31/166頁
文件大?。?/td> 713K
代理商: ΜSAP70732-B03
31
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 2:1:1 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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