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otb
Commits
1f9af73a
Commit
1f9af73a
authored
Dec 12, 2011
by
Julien Michel
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ENH: Aligning streams on a power of 2 grid with respect to a decoding tile size
parent
345134b2
Changes
2
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2 changed files
with
50 additions
and
13 deletions
+50
-13
Code/Common/otbImageRegionSquareTileSplitter.h
Code/Common/otbImageRegionSquareTileSplitter.h
+2
-1
Code/Common/otbImageRegionSquareTileSplitter.txx
Code/Common/otbImageRegionSquareTileSplitter.txx
+48
-12
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Code/Common/otbImageRegionSquareTileSplitter.h
View file @
1f9af73a
...
...
@@ -124,7 +124,7 @@ public:
itkGetMacro
(
TileDimension
,
unsigned
int
);
protected:
ImageRegionSquareTileSplitter
()
:
m_SplitsPerDimension
(
0U
),
m_TileDimension
(
0
),
m_TileSizeAlignment
(
16
)
{}
ImageRegionSquareTileSplitter
()
:
m_SplitsPerDimension
(
0U
),
m_TileDimension
(
0
),
m_TileSizeAlignment
(
0
),
m_TileHint
(
2048
)
{}
virtual
~
ImageRegionSquareTileSplitter
()
{}
void
PrintSelf
(
std
::
ostream
&
os
,
itk
::
Indent
indent
)
const
;
...
...
@@ -135,6 +135,7 @@ private:
itk
::
FixedArray
<
unsigned
int
,
VImageDimension
>
m_SplitsPerDimension
;
unsigned
int
m_TileDimension
;
unsigned
int
m_TileSizeAlignment
;
unsigned
int
m_TileHint
;
};
}
// end namespace otb
...
...
Code/Common/otbImageRegionSquareTileSplitter.txx
View file @
1f9af73a
...
...
@@ -33,8 +33,23 @@ ImageRegionSquareTileSplitter<VImageDimension>
unsigned int theoricalNbPixelPerTile = region.GetNumberOfPixels() / requestedNumber;
unsigned int theoricalTileDimension = static_cast<unsigned int> (vcl_sqrt(static_cast<double>(theoricalNbPixelPerTile)) );
// Take the next multiple of m_TileSizeAlignment (eventually generate more splits than requested)
m_TileDimension = (theoricalTileDimension + m_TileSizeAlignment - 1) / m_TileSizeAlignment * m_TileSizeAlignment;
m_TileDimension = m_TileHint;
// If we have less than one jpeg 2000 tile, split in sub-tiles
if(theoricalTileDimension < m_TileHint)
{
while(m_TileDimension > theoricalTileDimension)
{
m_TileDimension/=2;
}
}
else
{
while(2*m_TileDimension < theoricalTileDimension)
{
m_TileDimension*=2;
}
}
// Minimal tile size is m_TileSizeAlignment * m_TileSizeAlignment
if (m_TileDimension < m_TileSizeAlignment)
...
...
@@ -78,26 +93,47 @@ ImageRegionSquareTileSplitter<VImageDimension>
itkExceptionMacro("Asked for split number " << i << " but region contains only " << numPieces << " splits");
}
// Compute the split index in the streaming grid
unsigned int remaining = i;
// First, find the megatile index
unsigned int tilesPerMegaTilesPerDim = m_TileHint / m_TileDimension;
if(tilesPerMegaTilesPerDim == 0)
{
tilesPerMegaTilesPerDim =1;
}
unsigned int tilesPerMegaTiles = tilesPerMegaTilesPerDim*tilesPerMegaTilesPerDim;
unsigned int remaining = i / tilesPerMegaTiles;
for (unsigned int j = VImageDimension - 1; j > 0; --j)
{
splitIndex[j] =
remaining / m_SplitsPerDimension[VImageDimension - 1 - j]
;
remaining = remaining %
m_SplitsPerDimension[VImageDimension - 1 - j]
;
splitIndex[j] =
tilesPerMegaTilesPerDim * remaining / (m_SplitsPerDimension[VImageDimension - 1 - j] / tilesPerMegaTilesPerDim)
;
remaining = remaining %
(m_SplitsPerDimension[VImageDimension - 1 - j] / tilesPerMegaTilesPerDim)
;
}
splitIndex[0] = remaining;
splitIndex[0] =
tilesPerMegaTilesPerDim *
remaining;
// Now splitIndex contains the megaTile index
remaining = i % tilesPerMegaTiles;
for (unsigned int j = VImageDimension - 1; j > 0; --j)
{
splitIndex[j] += remaining / tilesPerMegaTilesPerDim;
remaining = remaining % (tilesPerMegaTilesPerDim);
}
splitIndex[0]+= remaining;
// Now split index contains the tile index
// Transform the split index to the actual coordinates
for (unsigned int j = 0; j < VImageDimension; ++j)
{
splitRegion.SetIndex(j, region.GetIndex(j) + m_TileDimension * splitIndex[j]);
splitRegion.SetSize(j, m_TileDimension);
}
// Handle the borders
splitRegion.Crop(region);
return splitRegion;
// Handle the borders
splitRegion.Crop(region);
return splitRegion;
}
/**
...
...
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