Page 210 - DCAP303_MULTIMEDIA_SYSTEMS

Multimedia Systems

notes
Differential spatial, Huffman SOF7 FFC7H
Reserved for JPEG extensions, Arithmetic JPG FFC8H
Extended sequential DCT, Arithmetic SOF9 FFC9H
Progressive DCT, Arithmetic SOF10 FFCAH
Spatial (sequential) lossless, Arithmetic SOF11 FFCBH
Differential sequential DCT, Arithmetic SOF13 FFCDH
Differential progressive DCT, Arithmetic SOF14 FFCEH
Differential spatial, Arithmetic SOF15 FFCFH
Define Huffman Table(s) DHT FFC4H
Define Arithmetic coding conditioning DAC FFCCH
Restart RSTm FFD0-FFD7H
Start of Image SOI FFD8H
End of Image EOI FFD9H
Start of Scan SOS FFDAH
Define Quantisation Table DQT FFDBH
Define number of Lines DNL FFDCH
Define Restart Interval DRI FFDDH
Define Hierarchical progression DHP FFDEH
Expand reference components EXP FFDFH
Reserved for Application Segments APPn FFE0-FFEFH
Reserved for JPEG extensions JPGn FFF0-FFFDH
Comment COM FFFEH
Temporary arithmetic Coding TEM FF01H
Reserved RES FF02-FFBFH

start of image (soi) segment
This segment is always 2 bytes long and always contains the marker FFD8H
Jfif application (app0) segment
This segment contains the following information in order. The purpose of this segment is to define
higher level details such as image size and miscellaneous version control information. The number
in brackets indicates the number of bytes the information is stored in.
• Segment marker (2). Is always FFE0H
• Section length (2). Does not include the segment marker

• Application code (4). Is always “JFIF”
• JFIF major version number (2)
• JFIF minor version number (2)

• Horizontal pixel density of the image (2)
• Vertical pixel density of the image (2)
• Width of thumbnail image (1)
• Height of thumbnail image (1)

This segment contains information detailing the Quantization Tables for the encoded image. The
number in brackets indicates the number of bytes the information is stored in:

204 LoveLy professionaL University