Module org.bigdataviewer.core

Package bdv.util

Class MipmapTransforms

java.lang.Object

bdv.util.MipmapTransforms

public class MipmapTransforms
extends Object

Constructor Summary

Constructors

Constructor	Description
MipmapTransforms()

Method Summary

Modifier and Type	Method	Description
static int	getBestMipMapLevel(net.imglib2.realtransform.AffineTransform3D screenTransform, Source<?> source, int timepoint)	Get the mipmap level that best matches the given screen scale for the given source.
static net.imglib2.realtransform.AffineTransform3D	getMipmapTransformDefault(double[] resolution)	Compute the transformation (scale and shift) that maps from coordinates in a down-scaled image to coordinates in the original image.
static double[]	getPixelSourceSize(net.imglib2.realtransform.AffineTransform3D screenTransform, Source<?> source, int timepoint, int mipmapIndex)	Compute the size of the backprojected screen pixel in the Source space.
static double	getVoxelScreenSize(net.imglib2.realtransform.AffineTransform3D screenTransform, Source<?> source, int timepoint, int mipmapIndex)	Compute the projected voxel size at the given screen transform and mipmap level of a Source.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MipmapTransforms

public MipmapTransforms()

Method Detail

getMipmapTransformDefault

public static net.imglib2.realtransform.AffineTransform3D getMipmapTransformDefault(double[] resolution)

Compute the transformation (scale and shift) that maps from coordinates in a down-scaled image to coordinates in the original image. This assumes that each down-scaled pixel is the average of a block of blocks of pixels in the original image. For down-scaling by a factor of 2, pixel (0,0,0) in the down-scaled image is the average of the 8 pixel block from (0,0,0) to (1,1,1) in the original image.

Parameters:

resolution - the down-scaling factors in each dimension. {4,4,2} means every pixel in the down-scaled image corresponds to a 4x4x2 pixel block in the original image.

Returns:

transformation from down-scaled image to original image.

getVoxelScreenSize

public static double getVoxelScreenSize(net.imglib2.realtransform.AffineTransform3D screenTransform,
                                        Source<?> source,
                                        int timepoint,
                                        int mipmapIndex)

Compute the projected voxel size at the given screen transform and mipmap level of a Source. Take a source voxel (0,0,0)-(1,1,1) at the given mipmap level and transform it to the screen image at the given screen scale. Take the maximum of the screen extends of the transformed projected voxel edges.

Parameters:

screenTransform - transforms screen coordinates to global coordinates.

source - the source

timepoint - for which timepoint to query the source

mipmapIndex - mipmap level

Returns:

pixel size

getPixelSourceSize

public static double[] getPixelSourceSize(net.imglib2.realtransform.AffineTransform3D screenTransform,
                                          Source<?> source,
                                          int timepoint,
                                          int mipmapIndex)

Compute the size of the backprojected screen pixel in the Source space. Take a screen pixel (0,0)-(1,1) and transform it into the source coordinate system at the given mipmap level and screen scale, then compute the length of the resulting vectors.

Parameters:

screenTransform - transforms screen coordinates to global coordinates.

source - the source

timepoint - for which timepoint to query the source

mipmapIndex - mipmap level

Returns:

pixel size

getBestMipMapLevel

public static int getBestMipMapLevel(net.imglib2.realtransform.AffineTransform3D screenTransform,
                                     Source<?> source,
                                     int timepoint)

Get the mipmap level that best matches the given screen scale for the given source. Assumes that mipmap indices in the source are ordered by decreasing resolution.

Parameters:

screenTransform - transforms screen coordinates to global coordinates.

source - the source

timepoint - for which timepoint to query the source

Returns:

index of the best-matching mipmap level