ClassifierFactoryGradientHistogram Method

CVB.Net Documentation

Calculate the gradient histogram over the aoi in an image plane. The gradient histogram may be useful to determine a suitable contrast threshold value for classifier generation and search operations.

Namespace: Stemmer.Cvb.ShapeFinder
Assembly: Stemmer.Cvb.ShapeFinder (in Stemmer.Cvb.ShapeFinder.dll) Version: 14.0.0.0

Syntax

C++

Copy

public static int[] GradientHistogram(
	ImagePlane plane,
	Rect aoi,
	GradientType gradient
)

Public Shared Function GradientHistogram ( 
	plane As ImagePlane,
	aoi As Rect,
	gradient As GradientType
) As Integer()

public:
static array<int>^ GradientHistogram(
	ImagePlane plane, 
	Rect aoi, 
	GradientType gradient
)

static member GradientHistogram : 
        plane : ImagePlane * 
        aoi : Rect * 
        gradient : GradientType -> int[]

Parameters

plane: Type: Stemmer.CvbImagePlane
image plane in which to claculate the histogram
aoi: Type: Stemmer.CvbRect
area of interest in which to calculate the histogram
gradient: Type: Stemmer.Cvb.ShapeFinderGradientType
gradient operator to use for the calculating the histogram

Return Value

Type: Int32
the calculated histogram

Exceptions

Exception	Condition
ArgumentNullException	If the Parent of plane parameter is null
ObjectDisposedException	If the Parent of plane has already been disposed
CvbException	when trying to learn a classifier from an image plane that does not have the data type 8 bits per pixel unsigned, or if an unspecific error occurs

Reference

ClassifierFactory Class

Stemmer.Cvb.ShapeFinder Namespace

ClassifierFactoryAddLanguageSpecificTextSet("LST46216EA0_0?cpp=::|nu=.");GradientHistogram Method

Parameters

Return Value

Reference

ClassifierFactoryGradientHistogram Method