ImageDev

ClosestBoundaryPoints2d

Computes the Chamfer distance map of the background of a two-dimensional image and the coordinates of the associated boundary points.

Access to parameter description

This algorithm is like the DistanceMap2d algorithm, applied on the background of the input image, and indicates the distance to the closest object boundary point.
It also stores the X and Y coordinates of the corresponding point in two additional output images.

Note: This algorithm does not take into account the input image calibration. The output values are systematically indicating distance in pixel units.

See also

Function Syntax

This function returns a ClosestBoundaryPoints2dOutput structure containing the outputMapImage, outputImageX and outputImageY output parameters. 
// Output structure.
struct ClosestBoundaryPoints2dOutput
{
    std::shared_ptr< iolink::ImageView > outputMapImage;
    std::shared_ptr< iolink::ImageView > outputImageX;
    std::shared_ptr< iolink::ImageView > outputImageY;
};

// Function prototype.
ClosestBoundaryPoints2dOutput
closestBoundaryPoints2d( std::shared_ptr< iolink::ImageView > inputBinaryImage,
                         std::shared_ptr< iolink::ImageView > outputMapImage = NULL,
                         std::shared_ptr< iolink::ImageView > outputImageX = NULL,
                         std::shared_ptr< iolink::ImageView > outputImageY = NULL );
This function returns a tuple containing the output_map_image, output_image_x and output_image_y output parameters. 
// Function prototype.
closest_boundary_points_2d( input_binary_image,
                            output_map_image = None,
                            output_image_x = None,
                            output_image_y = None )
This function returns a ClosestBoundaryPoints2dOutput structure containing the outputMapImage, outputImageX and outputImageY output parameters. 
/// Output structure of the ClosestBoundaryPoints2d function.
public struct ClosestBoundaryPoints2dOutput
{
    public IOLink.ImageView outputMapImage;
    public IOLink.ImageView outputImageX;
    public IOLink.ImageView outputImageY;
};

// Function prototype.
public static ClosestBoundaryPoints2dOutput
ClosestBoundaryPoints2d( IOLink.ImageView inputBinaryImage,
                         IOLink.ImageView outputMapImage = null,
                         IOLink.ImageView outputImageX = null,
                         IOLink.ImageView outputImageY = null );

Class Syntax

Parameters

Class Name ClosestBoundaryPoints2d

Parameter Name Description Type Supported Values Default Value
input
inputBinaryImage
The binary input image. Image Binary nullptr
output
outputMapImage
The output background distance map image. Its dimensions are forced to the same values as the input. Its type is signed 16-bit integer. Image nullptr
output
outputImageX
The X coordinate image of the closest boundary point, in pixel units. Its dimensions are forced to the same values as the input. Its type is signed 16-bit integer. Image nullptr
output
outputImageY
The Y coordinate image of the closest boundary point, in pixel units. Its dimensions are forced to the same values as the input. Its type is signed 16-bit integer. Image nullptr

Object Examples

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

ClosestBoundaryPoints2d closestBoundaryPoints2dAlgo;
closestBoundaryPoints2dAlgo.setInputBinaryImage( polystyrene_sep );
closestBoundaryPoints2dAlgo.execute();

std::cout << "outputMapImage:" << closestBoundaryPoints2dAlgo.outputMapImage()->toString();
std::cout << "outputImageX:" << closestBoundaryPoints2dAlgo.outputImageX()->toString();
std::cout << "outputImageY:" << closestBoundaryPoints2dAlgo.outputImageY()->toString();

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

closest_boundary_points_2d_algo = imagedev.ClosestBoundaryPoints2d()
closest_boundary_points_2d_algo.input_binary_image = polystyrene_sep
closest_boundary_points_2d_algo.execute()

print( "output_map_image:", str( closest_boundary_points_2d_algo.output_map_image ) )
print( "output_image_x:", str( closest_boundary_points_2d_algo.output_image_x ) )
print( "output_image_y:", str( closest_boundary_points_2d_algo.output_image_y ) )

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

ClosestBoundaryPoints2d closestBoundaryPoints2dAlgo = new ClosestBoundaryPoints2d
{
    inputBinaryImage = polystyrene_sep
};
closestBoundaryPoints2dAlgo.Execute();

Console.WriteLine( "outputMapImage:" + closestBoundaryPoints2dAlgo.outputMapImage.ToString() );
Console.WriteLine( "outputImageX:" + closestBoundaryPoints2dAlgo.outputImageX.ToString() );
Console.WriteLine( "outputImageY:" + closestBoundaryPoints2dAlgo.outputImageY.ToString() );

Function Examples

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

auto result = closestBoundaryPoints2d( polystyrene_sep );

std::cout << "outputMapImage:" << result.outputMapImage->toString();
std::cout << "outputImageX:" << result.outputImageX->toString();
std::cout << "outputImageY:" << result.outputImageY->toString();

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

result_output_map_image, result_output_image_x, result_output_image_y = imagedev.closest_boundary_points_2d( polystyrene_sep )

print( "output_map_image:", str( result_output_map_image ) )
print( "output_image_x:", str( result_output_image_x ) )
print( "output_image_y:", str( result_output_image_y ) )

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

Processing.ClosestBoundaryPoints2dOutput result = Processing.ClosestBoundaryPoints2d( polystyrene_sep );

Console.WriteLine( "outputMapImage:" + result.outputMapImage.ToString() );
Console.WriteLine( "outputImageX:" + result.outputImageX.ToString() );
Console.WriteLine( "outputImageY:" + result.outputImageY.ToString() );