Databases Reference
In-Depth Information
Xsiz
XOsiz
(0,0)
(XOsiz,YOsiz)
Image Area
F I GU R E 16 . 23
Some of the parameters in the SIZ marker with respect to a
reference grid [
219
].
The parameters contained in the SIZ marker segment are shown with respect to a reference
grid in Figure
16.23
.
Functional Markers
There are six functional marker segments. The same markers can
be used in reference to the whole image or the tile depending on their location. If found in
the main header they describe the functions used to code the entire image. If found in the tile
header they describe the functions used to code the tile. The functional markers include the
coding style (COD) marker, the coding style component (COC) marker, the region of interest
(RGN) marker, the quantization default (QCD) marker, the quantization component (QCC)
marker, and the progression order change default (POD) marker.
The coding style (COD) marker is followed by a segment that describes the type of en-
tropy coding used, the number of decomposition levels (with zero implying no transform),
the progression order, the number of layers, the code-block dimensions, the wavelet transform
used, and the multiple component transform used. The information about the decomposi-
tion level, code-block dimensions, transform, and packet partition size contained in the COD
marker can be overridden for a particular component by the coding style component (COC)
marker.
