ImageDev

AxisPropagationDistance3d

Simulates the propagation through a phase of a three-dimensional image and computes an image of traveled distances.

Access to parameter description

For an introduction: The values set in the output image correspond to the distance traveled to reach a voxel starting from an image border used as seed. This border is defined by the axis and propagationDirection parameters.

The maskAndSeedValues and maximumThreshold parameters identify areas of the image in which propagation can be done; therefore, it allows identifying non-porous areas.

Propagation is performed from the seeds, along the user defined axis, through voxels of intensity X verifying the following four conditions: The following images illustrate this algorithm results:



Figure 1. Input CT core sample image (left) and propagation distance image (right)

In the binary case, the maskAndSeedValues and maximumThreshold are ignored. The propagation does not reject any specific value, propagates through 0 intensity values and stops on 1 intensity values. It amounts to considering maskAndSeedValues at [2, 0] and maximumThreshold at 0.

See also

Function Syntax

This function returns a AxisPropagationDistance3dOutput structure containing the outputImage and outputMeasurement output parameters. 
// Output structure.
struct AxisPropagationDistance3dOutput
{
    std::shared_ptr< iolink::ImageView > outputImage;
    AxisPropagationDistance3dMsr::Ptr outputMeasurement;
};

// Function prototype.
AxisPropagationDistance3dOutput
axisPropagationDistance3d( std::shared_ptr< iolink::ImageView > inputImage,
                           iolink::Vector2i32 maskAndSeedValues,
                           int32_t maximumThreshold,
                           AxisPropagationDistance3d::Axis axis,
                           AxisPropagationDistance3d::PropagationDirection propagationDirection,
                           std::shared_ptr< iolink::ImageView > outputImage = NULL,
                           AxisPropagationDistance3dMsr::Ptr outputMeasurement = NULL );
This function returns a tuple containing the output_image and output_measurement output parameters. 
// Function prototype.
axis_propagation_distance_3d( input_image,
                              mask_and_seed_values = [255, -1024],
                              maximum_threshold = 128,
                              axis = AxisPropagationDistance3d.Axis.Z_AXIS,
                              propagation_direction = AxisPropagationDistance3d.PropagationDirection.MIN_TO_MAX,
                              output_image = None,
                              output_measurement = None )
This function returns a AxisPropagationDistance3dOutput structure containing the outputImage and outputMeasurement output parameters. 
/// Output structure of the AxisPropagationDistance3d function.
public struct AxisPropagationDistance3dOutput
{
    public IOLink.ImageView outputImage;
    public AxisPropagationDistance3dMsr outputMeasurement;
};

// Function prototype.
public static AxisPropagationDistance3dOutput
AxisPropagationDistance3d( IOLink.ImageView inputImage,
                           int[] maskAndSeedValues = null,
                           Int32 maximumThreshold = 128,
                           AxisPropagationDistance3d.Axis axis = ImageDev.AxisPropagationDistance3d.Axis.Z_AXIS,
                           AxisPropagationDistance3d.PropagationDirection propagationDirection = ImageDev.AxisPropagationDistance3d.PropagationDirection.MIN_TO_MAX,
                           IOLink.ImageView outputImage = null,
                           AxisPropagationDistance3dMsr outputMeasurement = null );

Class Syntax

Parameters

Class Name AxisPropagationDistance3d

Parameter Name Description Type Supported Values Default Value
input
inputImage
The input grayscale, binary, or color image. In the case of a binary image, the background represents the phase where the propagation has to be performed. Image Binary, Label or Grayscale nullptr
input
maskAndSeedValues
The first value is a mask value. Voxels with this intensity value are not infiltrated by the propagation. The second value is the seed value. Voxels with an intensity value lower than this seed value are not infiltrated by the propagation. A value lower than the second value of maskAndSeedValues or greater or equal to maximumThreshold is ignored. This parameter is ignored in binary case, and then is forced to [2, 0]. Vector2i32 Any value {255, -1024}
input
maximumThreshold
The maximum propagation intensity value. Voxels having an intensity value greater or equal to this value are rejected by the propagation. This parameter is ignored in binary case, and is forced to 1. Int32 Any value 128
input
axis
The axis along which the propagation is performed.
X_AXIS The propagation is performed along the X axis.
Y_AXIS The propagation is performed along the Y axis.
Z_AXIS The propagation is performed along the Z axis.
Enumeration Z_AXIS
input
propagationDirection
The direction in which the propagation is performed.
MIN_TO_MAX The propagation is performed from the first to the last slice index.
MAX_TO_MIN The propagation is performed from the last to the first slice index.
Enumeration MIN_TO_MAX
output
outputImage
The grayscale output image where each voxel intensity value represents the propagation distance from the seeds. This distance is expressed in voxels; it is not calibrated. Its dimensions and type are forced to the same values as the input. Image nullptr
output
outputMeasurement
The output measurement result. AxisPropagationDistance3dMsr nullptr

Object Examples

auto foam_sep = readVipImage( std::string( IMAGEDEVDATA_IMAGES_FOLDER ) + "foam_sep.vip" );

AxisPropagationDistance3d axisPropagationDistance3dAlgo;
axisPropagationDistance3dAlgo.setInputImage( foam_sep );
axisPropagationDistance3dAlgo.setMaskAndSeedValues( {255, -1024} );
axisPropagationDistance3dAlgo.setMaximumThreshold( 128 );
axisPropagationDistance3dAlgo.setAxis( AxisPropagationDistance3d::Axis::X_AXIS );
axisPropagationDistance3dAlgo.setPropagationDirection( AxisPropagationDistance3d::PropagationDirection::MIN_TO_MAX );
axisPropagationDistance3dAlgo.execute();

std::cout << "outputImage:" << axisPropagationDistance3dAlgo.outputImage()->toString();
std::cout << "isVolumePierced: " << axisPropagationDistance3dAlgo.outputMeasurement()->isVolumePierced( ) ;

foam_sep = imagedev.read_vip_image(imagedev_data.get_image_path("foam_sep.vip"))

axis_propagation_distance_3d_algo = imagedev.AxisPropagationDistance3d()
axis_propagation_distance_3d_algo.input_image = foam_sep
axis_propagation_distance_3d_algo.mask_and_seed_values = [255, -1024]
axis_propagation_distance_3d_algo.maximum_threshold = 128
axis_propagation_distance_3d_algo.axis = imagedev.AxisPropagationDistance3d.X_AXIS
axis_propagation_distance_3d_algo.propagation_direction = imagedev.AxisPropagationDistance3d.MIN_TO_MAX
axis_propagation_distance_3d_algo.execute()

print( "output_image:", str( axis_propagation_distance_3d_algo.output_image ) )
print( "isVolumePierced: ", str( axis_propagation_distance_3d_algo.output_measurement.is_volume_pierced( ) ) )

ImageView foam_sep = Data.ReadVipImage( @"Data/images/foam_sep.vip" );

AxisPropagationDistance3d axisPropagationDistance3dAlgo = new AxisPropagationDistance3d
{
    inputImage = foam_sep,
    maskAndSeedValues = new int[]{255, -1024},
    maximumThreshold = 128,
    axis = AxisPropagationDistance3d.Axis.X_AXIS,
    propagationDirection = AxisPropagationDistance3d.PropagationDirection.MIN_TO_MAX
};
axisPropagationDistance3dAlgo.Execute();

Console.WriteLine( "outputImage:" + axisPropagationDistance3dAlgo.outputImage.ToString() );
Console.WriteLine( "isVolumePierced: " + axisPropagationDistance3dAlgo.outputMeasurement.isVolumePierced( ) );

Function Examples

auto foam_sep = readVipImage( std::string( IMAGEDEVDATA_IMAGES_FOLDER ) + "foam_sep.vip" );

auto result = axisPropagationDistance3d( foam_sep, {255, -1024}, 128, AxisPropagationDistance3d::Axis::X_AXIS, AxisPropagationDistance3d::PropagationDirection::MIN_TO_MAX );

std::cout << "outputImage:" << result.outputImage->toString();
std::cout << "isVolumePierced: " << result.outputMeasurement->isVolumePierced( ) ;

foam_sep = imagedev.read_vip_image(imagedev_data.get_image_path("foam_sep.vip"))

result_output_image, result_output_measurement = imagedev.axis_propagation_distance_3d( foam_sep, [255, -1024], 128, imagedev.AxisPropagationDistance3d.X_AXIS, imagedev.AxisPropagationDistance3d.MIN_TO_MAX )

print( "output_image:", str( result_output_image ) )
print( "isVolumePierced: ", str( result_output_measurement.is_volume_pierced( ) )  )

ImageView foam_sep = Data.ReadVipImage( @"Data/images/foam_sep.vip" );

Processing.AxisPropagationDistance3dOutput result = Processing.AxisPropagationDistance3d( foam_sep, new int[]{255, -1024}, 128, AxisPropagationDistance3d.Axis.X_AXIS, AxisPropagationDistance3d.PropagationDirection.MIN_TO_MAX );

Console.WriteLine( "outputImage:" + result.outputImage.ToString() );
Console.WriteLine(  "isVolumePierced: " + result.outputMeasurement.isVolumePierced( )  );