ImageDev

Dilation2d

Performs a two-dimensional dilation using a structuring element matching with a square or a cross.

Access to parameter description

For an introduction: The dilation is performed by an iterative method in which each step dilates the result of the previous step. The kernelRadius parameter tunes the number of iterations, which sets the kernel size.
This algorithm uses a basic structuring element with either 8 neighbors, or 4 neighbors, according to the neighborhood parameter.

<b> Figure 1.</b> Structuring elements
Figure 1. Structuring elements
See also

Function Syntax

This function returns the outputImage output parameter. 
// Function prototype.
std::shared_ptr< iolink::ImageView >
dilation2d( std::shared_ptr< iolink::ImageView > inputImage,
            uint32_t kernelRadius,
            Dilation2d::Neighborhood neighborhood,
            std::shared_ptr< iolink::ImageView > outputImage = NULL );
This function returns the outputImage output parameter. 
// Function prototype.
dilation_2d( input_image,
             kernel_radius = 3,
             neighborhood = Dilation2d.Neighborhood.CONNECTIVITY_8,
             output_image = None )
This function returns the outputImage output parameter. 
// Function prototype.
public static IOLink.ImageView
Dilation2d( IOLink.ImageView inputImage,
            UInt32 kernelRadius = 3,
            Dilation2d.Neighborhood neighborhood = ImageDev.Dilation2d.Neighborhood.CONNECTIVITY_8,
            IOLink.ImageView outputImage = null );

Class Syntax

Parameters

Class Name Dilation2d

Parameter Name Description Type Supported Values Default Value
input
inputImage
The input image. The image type can be integer or float. Image Binary, Label, Grayscale or Multispectral nullptr
input
kernelRadius
The number of iterations (the half size of the structuring element, in pixels). A square structuring element always has an odd side length (3x3, 5x5, etc.) which is defined by twice the kernel radius + 1. UInt32 >=1 3
input
neighborhood
The 2D neighborhood configuration.
CONNECTIVITY_4 The structuring element is a cross.
CONNECTIVITY_8 The structuring element is a square.
Enumeration CONNECTIVITY_8
output
outputImage
The output image. Its dimensions and type are forced to the same values as the input image. Image nullptr

Object Examples

std::shared_ptr< iolink::ImageView > polystyrene = ioformat::readImage( std::string( IMAGEDEVDATA_IMAGES_FOLDER ) + "polystyrene.tif" );

Dilation2d dilation2dAlgo;
dilation2dAlgo.setInputImage( polystyrene );
dilation2dAlgo.setKernelRadius( 3 );
dilation2dAlgo.setNeighborhood( Dilation2d::Neighborhood::CONNECTIVITY_8 );
dilation2dAlgo.execute();

std::cout << "outputImage:" << dilation2dAlgo.outputImage()->toString();

polystyrene = ioformat.read_image(imagedev_data.get_image_path("polystyrene.tif"))

dilation_2d_algo = imagedev.Dilation2d()
dilation_2d_algo.input_image = polystyrene
dilation_2d_algo.kernel_radius = 3
dilation_2d_algo.neighborhood = imagedev.Dilation2d.CONNECTIVITY_8
dilation_2d_algo.execute()

print( "output_image:", str( dilation_2d_algo.output_image ) );

ImageView polystyrene = ViewIO.ReadImage( @"Data/images/polystyrene.tif" );

Dilation2d dilation2dAlgo = new Dilation2d
{
    inputImage = polystyrene,
    kernelRadius = 3,
    neighborhood = Dilation2d.Neighborhood.CONNECTIVITY_8
};
dilation2dAlgo.Execute();

Console.WriteLine( "outputImage:" + dilation2dAlgo.outputImage.ToString() );

Function Examples

std::shared_ptr< iolink::ImageView > polystyrene = ioformat::readImage( std::string( IMAGEDEVDATA_IMAGES_FOLDER ) + "polystyrene.tif" );

auto result = dilation2d( polystyrene, 3, Dilation2d::Neighborhood::CONNECTIVITY_8 );

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

polystyrene = ioformat.read_image(imagedev_data.get_image_path("polystyrene.tif"))

result = imagedev.dilation_2d( polystyrene, 3, imagedev.Dilation2d.CONNECTIVITY_8 )

print( "output_image:", str( result ) );

ImageView polystyrene = ViewIO.ReadImage( @"Data/images/polystyrene.tif" );

IOLink.ImageView result = Processing.Dilation2d( polystyrene, 3, Dilation2d.Neighborhood.CONNECTIVITY_8 );

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