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==== 1. Initial threshold T<sub>0</sub>: (Assume C<sub>max</sub> is the largest coefficient.) ====
<span>[[File:Threshold-0119.png
==== 2. Threshold T<sub>i</sub> is reduced to half of the value of the previous threshold. ====
[[File:Threshold-01192.png|
=== C. Scanning order for coefficients ===
'''Raster scanning''' is the rectangular pattern of image capture and reconstruction. Using this scanning on EZW transform is to perform scanning the coefficients in such way that no child node is scanned before its parent node. Also, all positions in a given subband are scanned before it moves to the next subband.
=== D. Two-pass bitplane coding ===
==== (1) Refinement pass (or subordinate pass) ====
This determine that if the coefficient is the internal [Ti, 2Ti). And A refinement bit is coded for each significant coefficient.
In this method, it will visit the significant coefficients according to the magnitude and raster order within subbands.
==== (2) Significant pass (or dominant pass) ====
This method will code a bit for each coefficient that is not yet be seen as significant. Once a determination of significance has been made, the significant coefficient is included in a list for further refinement in the refinement pass. And if any coefficient already known to be zero, it will not be coded again.
==See also==
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