Hi Jukka,
On Tue, Dec 22, 2015 at 4:34 AM, Jukka Rahkonen < jukka.rahko...@maanmittauslaitos.fi> wrote: > Aaron Boxer <boxerab <at> gmail.com> writes: > > > > This feature would be quite involved: one would have to gather all of the > layers for > > > > all of the code blocks in all of the precincts overlapping that > sub-tile,plus the immediately surrounding precincts, run the inverse > entropy > coder to get the wavelet coefficients, and then do an inverse wavelet > transform,with this incomplete set of coefficients. > > > > I do not claim that I understand GIS but I have a feeling that precincts > are > designed for a fast ROI access. From > http://www2.engr.arizona.edu/~bilgin/publications/SPIE2004_2.pdf > > "A precinct is a collection of code-blocks representing some finite spatial > extent at some resolution." > > Probably gathering the surrounding precincts is unnecessary. Author of > Kakadu seems to dislike tiles and it is no wonder that with Kakadu > precincts > perform well even with archived documents > http://www.digitizationguidelines.gov/still-image/documents/Martin.pdf. > Thanks. Yes, I think precincts are key. But, the way the wavelet transform works, there need to be a number of locations on the boundary of the precinct to correctly transform. I suppose bordering code blocks would be enough, the entire precinct on the border is not necessary. Cheers, Aaron
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