FreeMat: vtkVolumeReader

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vtkVolumeReader

Section: Visualization Toolkit IO Classes

# Usage

vtkVolumeReader is a source object that reads image files.

VolumeReader creates structured point datasets. The dimension of the dataset depends upon the number of files read. Reading a single file results in a 2D image, while reading more than one file results in a 3D volume.

File names are created using FilePattern and FilePrefix as follows: sprintf (filename, FilePattern, FilePrefix, number); where number is in the range ImageRange[0] to ImageRange[1]. If ImageRange[1] <= ImageRange[0], then slice number ImageRange[0] is read. Thus to read an image set ImageRange[0] = ImageRange[1] = slice number. The default behavior is to read a single file (i.e., image slice 1).

The DataMask instance variable is used to read data files with imbedded connectivity or segmentation information. For example, some data has the high order bit set to indicate connected surface. The DataMask allows you to select this data. Other important ivars include HeaderSize, which allows you to skip over initial info, and SwapBytes, which turns on/off byte swapping. Consider using vtkImageReader as a replacement.

To create an instance of class vtkVolumeReader, simply invoke its constructor as follows

      obj = vtkVolumeReader

# Methods

The class vtkVolumeReader has several methods that can be used. They are listed below. Note that the documentation is translated automatically from the VTK sources, and may not be completely intelligible. When in doubt, consult the VTK website. In the methods listed below, `obj` is an instance of the vtkVolumeReader class.

- `string = obj.GetClassName ()`
- `int = obj.IsA (string name)`
- `vtkVolumeReader = obj.NewInstance ()`
- `vtkVolumeReader = obj.SafeDownCast (vtkObject o)`
- `obj.SetFilePrefix (string )` - Specify file prefix for the image file(s).
- `string = obj.GetFilePrefix ()` - Specify file prefix for the image file(s).
- `obj.SetFilePattern (string )` - The sprintf format used to build filename from FilePrefix and number.
- `string = obj.GetFilePattern ()` - The sprintf format used to build filename from FilePrefix and number.
- `obj.SetImageRange (int , int )` - Set the range of files to read.
- `obj.SetImageRange (int a[2])` - Set the range of files to read.
- `int = obj. GetImageRange ()` - Set the range of files to read.
- `obj.SetDataSpacing (double , double , double )` - Specify the spacing for the data.
- `obj.SetDataSpacing (double a[3])` - Specify the spacing for the data.
- `double = obj. GetDataSpacing ()` - Specify the spacing for the data.
- `obj.SetDataOrigin (double , double , double )` - Specify the origin for the data.
- `obj.SetDataOrigin (double a[3])` - Specify the origin for the data.
- `double = obj. GetDataOrigin ()` - Specify the origin for the data.
- `vtkImageData = obj.GetImage (int ImageNumber)` - Other objects make use of this method.