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): 106/166頁
文件大小: 713K
代理商: ΜSAP70732-B03
106
μSAP705100-B03, μSAP70732-B03 USER'S MANUAL
(5) DHT segment, DQT segment
In the general JPEG format, the header includes two quantization tables as the DQT segment, and four
Huffman tables as the DHT segment.
The JPEG standard (ISO/IEC 10918) permits these tables to be described separately or together.
Examples of the description are shown below.
(a) Describing two 64-byte tables separately
0xFF, 0xDB, (segment length (2 bytes)), (table number), 64-byte table
0xFF, 0xDB, (segment length (2 bytes)), (table number), 64-byte table
(b) Describing two 64-byte tables together
0xFF, 0xDB, (segment length (2 bytes)), (table number), 64-byte table, (table number), 64-byte table
With the AP705100-B03 and AP70732-B03 libraries, the DQT and DHT segments are described
separately, when compression is performed in a general way.
To describe the DQT and DHT segments together using the AP705100-B03 or AP70732-B03 libraries,
follow the procedure below.
Cast the four bytes of CJInfo.IR [8] into unsigned char* type, and specify the two-letter key word “Ex.”
Example of description: *(unsigned char**)&(CJInfo.IR[8]) = “Ex”;
*
Separate description
DHT (FF C4 ee ee)
(00)
Table for Y-DC
(01)
Table for Cb/Cr-DC
(10)
Table for Y-AC
(11)
Table for Cb/Cr-AC
DQT (FF DB 00 C5)
(00)
Quantization table for Y
(64 bytes)
(01)
Quantization table for Cb/Cr
(64 bytes)
Comprehensive description
DQT (FF DB 00 43 00)
Quantization table for Y
(64 bytes)
DQT (FF DB 00 43 01)
Quantization table for Cb/Cr
(64 bytes)
DHT (FF C4 aa aa 00)
Huffman table for Y-DC
DHT (FF C4 bb bb 01)
Table for Cb/Cr-DC
DHT (FF C4 cc cc 10)
Table for Y-AC
DHT (FF C4 dd dd 11)
Table for Cb/Cr-AC
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