SnnFilter2d

Performs an edge-preserving smoothing of a two-dimensional image with the Symmetric Nearest Neighbor filter.

Access to parameter description

For an introduction to image filters: see Images Filtering.

This algorithm implements the Symmetric Nearest Neighbor filter (SNN), which is an average filter weighted by the structural symmetry of a rectangular neighborhood window. It computes a local mean around a central pixel

$x$ , considering for each neighbor pixel

$y$ , having a gray level

$I(y)$ , the value given by:

$I'(y)=\left\{\begin{array}{ll} I(y) & ~\mbox{if $|I(x)-I(y)| < |I(x)-I(y_s)|$} \\ I(y_s) & ~\mbox{if $|I(x)-I(y)| > |I(x)-I(y_s)|$} \\ I(x) & ~\mbox{otherwise} \end{array}\right.$ Where

$y_s$ is the neighbor pixel symmetric to

$y$ with respect to

$x$ .

The output value of the pixel

$x$ is then given by:

$O(x)=\mu[I'(y)]$ Where

$\mu$ is the mean value of the local window.

See also

Function Syntax

This function returns outputImage.

// Function prototype
std::shared_ptr< iolink::ImageView >
snnFilter2d( std::shared_ptr< iolink::ImageView > inputImage,
             int32_t kernelSizeX,
             int32_t kernelSizeY,
             std::shared_ptr< iolink::ImageView > outputImage = NULL );

This function returns outputImage.

// Function prototype.
snn_filter_2d( input_image,
               kernel_size_x = 3,
               kernel_size_y = 3,
               output_image = None )

This function returns outputImage.

// Function prototype.
public static IOLink.ImageView
SnnFilter2d( IOLink.ImageView inputImage,
             Int32 kernelSizeX = 3,
             Int32 kernelSizeY = 3,
             IOLink.ImageView outputImage = null );

Class Syntax

// Command constructor.
SnnFilter2d();

/// Gets the inputImage parameter.
/// The input image.
std::shared_ptr< iolink::ImageView > inputImage() const;
/// Sets the inputImage parameter.
/// The input image.
void setInputImage( std::shared_ptr< iolink::ImageView > inputImage );

/// Gets the kernelSizeX parameter.
/// The horizontal kernel size in pixels (odd value).
int32_t kernelSizeX() const;
/// Sets the kernelSizeX parameter.
/// The horizontal kernel size in pixels (odd value).
void setKernelSizeX( const int32_t& kernelSizeX );

/// Gets the kernelSizeY parameter.
/// The vertical kernel size in pixels (odd value).
int32_t kernelSizeY() const;
/// Sets the kernelSizeY parameter.
/// The vertical kernel size in pixels (odd value).
void setKernelSizeY( const int32_t& kernelSizeY );

/// Gets the outputImage parameter.
/// The output image. Its dimensions, type and calibration are forced to the same values as the input.
std::shared_ptr< iolink::ImageView > outputImage() const;
/// Sets the outputImage parameter.
/// The output image. Its dimensions, type and calibration are forced to the same values as the input.
void setOutputImage( std::shared_ptr< iolink::ImageView > outputImage );


// Method to launch the command.
void execute();

# Property of the inputImage parameter.
SnnFilter2d.input_image
# Property of the kernelSizeX parameter.
SnnFilter2d.kernel_size_x
# Property of the kernelSizeY parameter.
SnnFilter2d.kernel_size_y
# Property of the outputImage parameter.
SnnFilter2d.output_image

// Method to launch the command.
execute()

// Command constructor.
SnnFilter2d()

// Property of the inputImage parameter.
SnnFilter2d.inputImage
// Property of the kernelSizeX parameter.
SnnFilter2d.kernelSizeX
// Property of the kernelSizeY parameter.
SnnFilter2d.kernelSizeY
// Property of the outputImage parameter.
SnnFilter2d.outputImage

// Method to launch the command.
Execute()

Parameters

	Description	Type	Supported Values	Default Value
inputImage	The input image.	Image	Binary, Label, Grayscale or Multispectral	nullptr
kernelSizeX	The horizontal kernel size in pixels (odd value).	Int32	[3, 100]	3
kernelSizeY	The vertical kernel size in pixels (odd value).	Int32	[3, 100]	3
outputImage	The output image. Its dimensions, type and calibration are forced to the same values as the input.	Image		nullptr

Description	Type	Supported Values	Default Value
input_image	The input image.	image	Binary, Label, Grayscale or Multispectral	None
kernel_size_x	The horizontal kernel size in pixels (odd value).	int32	[3, 100]	3
kernel_size_y	The vertical kernel size in pixels (odd value).	int32	[3, 100]	3
output_image	The output image. Its dimensions, type and calibration are forced to the same values as the input.	image		None

Description	Type	Supported Values	Default Value
inputImage	The input image.	Image	Binary, Label, Grayscale or Multispectral	null
kernelSizeX	The horizontal kernel size in pixels (odd value).	Int32	[3, 100]	3
kernelSizeY	The vertical kernel size in pixels (odd value).	Int32	[3, 100]	3
outputImage	The output image. Its dimensions, type and calibration are forced to the same values as the input.	Image		null

Object Examples

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

SnnFilter2d snnFilter2dAlgo;
snnFilter2dAlgo.setInputImage( polystyrene );
snnFilter2dAlgo.setKernelSizeX( 3 );
snnFilter2dAlgo.setKernelSizeY( 3 );
snnFilter2dAlgo.execute();

std::cout << "outputImage:" << snnFilter2dAlgo.outputImage()->toString();

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

snn_filter_2d_algo = imagedev.SnnFilter2d()
snn_filter_2d_algo.input_image = polystyrene
snn_filter_2d_algo.kernel_size_x = 3
snn_filter_2d_algo.kernel_size_y = 3
snn_filter_2d_algo.execute()

print( "output_image:", str( snn_filter_2d_algo.output_image ) )

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

SnnFilter2d snnFilter2dAlgo = new SnnFilter2d
{
    inputImage = polystyrene,
    kernelSizeX = 3,
    kernelSizeY = 3
};
snnFilter2dAlgo.Execute();

Console.WriteLine( "outputImage:" + snnFilter2dAlgo.outputImage.ToString() );

Function Examples

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

auto result = snnFilter2d( polystyrene, 3, 3 );

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

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

result = imagedev.snn_filter_2d( polystyrene, 3, 3 )

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

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

IOLink.ImageView result = Processing.SnnFilter2d( polystyrene, 3, 3 );

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

SnnFilter2d

- Function Syntax

+ Class Syntax

Parameters

Object Examples

Function Examples

Function Syntax

Class Syntax