Constructor Detail

• MipmapTransforms

  public MipmapTransforms()

Method Detail

• getMipmapTransformDefault

  public static 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(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(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(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