ObjectCount

Computes the number of objects in a binary or label image.

Access to parameter description

For an introduction: section Image Analysis.
If the input is a binary image, it is first labeled by connected component and the maximum label value is returned as number of objects. If the input is a label image, the number of objects is equal to the maximum grey level value of the input image.

See also

See related examples

Function Syntax

This function returns a ObjectCountOutput structure containing outputLabelImage and outputMeasurement.

// Output structure of the objectCount function.
struct ObjectCountOutput
{
    /// The label output image.
    std::shared_ptr< iolink::ImageView > outputLabelImage;
    /// The output measurement result.
    ObjectCountMsr::Ptr outputMeasurement;
};

// Function prototype
ObjectCountOutput
objectCount( std::shared_ptr< iolink::ImageView > inputObjectImage,
             std::shared_ptr< iolink::ImageView > outputLabelImage = NULL,
             ObjectCountMsr::Ptr outputMeasurement = NULL );

This function returns a tuple containing output_label_image and output_measurement.

// Function prototype.
object_count( input_object_image, output_label_image = None, output_measurement = None )

This function returns a ObjectCountOutput structure containing outputLabelImage and outputMeasurement.

/// Output structure of the ObjectCount function.
public struct ObjectCountOutput
{
    /// The label output image.
    public IOLink.ImageView outputLabelImage;
    /// The output measurement result.
    public ObjectCountMsr outputMeasurement;
};

// Function prototype.
public static ObjectCountOutput
ObjectCount( IOLink.ImageView inputObjectImage,
             IOLink.ImageView outputLabelImage = null,
             ObjectCountMsr outputMeasurement = null );

Class Syntax

Parameters

Class Name	ObjectCount

	Description	Type	Supported Values	Default Value
inputObjectImage	The binary or label input image.	Image	Binary or Label	nullptr
outputLabelImage	The label output image.	Image		nullptr
outputMeasurement	The output measurement result.	ObjectCountMsr		nullptr

Object Examples

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

ObjectCount objectCountAlgo;
objectCountAlgo.setInputObjectImage( polystyrene_sep_label );
objectCountAlgo.execute();

std::cout << "outputLabelImage:" << objectCountAlgo.outputLabelImage()->toString();
std::cout << "count: " << objectCountAlgo.outputMeasurement()->count( 0 ) ;

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

object_count_algo = imagedev.ObjectCount()
object_count_algo.input_object_image = polystyrene_sep_label
object_count_algo.execute()

print( "output_label_image:", str( object_count_algo.output_label_image ) )
print( "count: ", str( object_count_algo.output_measurement.count( 0 ) ) )

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

ObjectCount objectCountAlgo = new ObjectCount
{
    inputObjectImage = polystyrene_sep_label
};
objectCountAlgo.Execute();

Console.WriteLine( "outputLabelImage:" + objectCountAlgo.outputLabelImage.ToString() );
Console.WriteLine( "count: " + objectCountAlgo.outputMeasurement.count( 0 ) );

Function Examples

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

auto result = objectCount( polystyrene_sep_label );

std::cout << "outputLabelImage:" << result.outputLabelImage->toString();
std::cout << "count: " << result.outputMeasurement->count( 0 ) ;

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

result_output_label_image, result_output_measurement = imagedev.object_count( polystyrene_sep_label )

print( "output_label_image:", str( result_output_label_image ) )
print( "count: ", str( result_output_measurement.count( 0 ) )  )

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

Processing.ObjectCountOutput result = Processing.ObjectCount( polystyrene_sep_label );

Console.WriteLine( "outputLabelImage:" + result.outputLabelImage.ToString() );
Console.WriteLine(  "count: " + result.outputMeasurement.count( 0 )  );