OpenCVForUnity.Features2dModule.SimpleBlobDetector Class Reference

Class for extracting blobs from an image. : More...

Public Member Functions
List< MatOfPoint >	getBlobContours ()
override string	getDefaultName ()
SimpleBlobDetector_Params	getParams ()
void	setParams (SimpleBlobDetector_Params _params)
Public Member Functions inherited from OpenCVForUnity.Features2dModule.Feature2D
void	compute (List< Mat > images, List< MatOfKeyPoint > keypoints, List< Mat > descriptors)
void	compute (Mat image, MatOfKeyPoint keypoints, Mat descriptors)
	Computes the descriptors for a set of keypoints detected in an image (first variant) or image set (second variant).
int	defaultNorm ()
int	descriptorSize ()
int	descriptorType ()
void	detect (List< Mat > images, List< MatOfKeyPoint > keypoints)
void	detect (List< Mat > images, List< MatOfKeyPoint > keypoints, List< Mat > masks)
void	detect (Mat image, MatOfKeyPoint keypoints)
	Detects keypoints in an image (first variant) or image set (second variant).
void	detect (Mat image, MatOfKeyPoint keypoints, Mat mask)
	Detects keypoints in an image (first variant) or image set (second variant).
void	detectAndCompute (Mat image, Mat mask, MatOfKeyPoint keypoints, Mat descriptors)
void	detectAndCompute (Mat image, Mat mask, MatOfKeyPoint keypoints, Mat descriptors, bool useProvidedKeypoints)
override bool	empty ()
	Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read.
void	read (string fileName)
void	write (string fileName)
Public Member Functions inherited from OpenCVForUnity.CoreModule.Algorithm
virtual void	clear ()
	Clears the algorithm state.
IntPtr	getNativeObjAddr ()
void	save (string filename)
Public Member Functions inherited from OpenCVForUnity.DisposableObject
void	Dispose ()
void	ThrowIfDisposed ()

Static Public Member Functions
static new SimpleBlobDetector	__fromPtr__ (IntPtr addr)
static SimpleBlobDetector	create ()
static SimpleBlobDetector	create (SimpleBlobDetector_Params parameters)
Static Public Member Functions inherited from OpenCVForUnity.Features2dModule.Feature2D
static new Feature2D	__fromPtr__ (IntPtr addr)
Static Public Member Functions inherited from OpenCVForUnity.CoreModule.Algorithm
static Algorithm	__fromPtr__ (IntPtr addr)
Static Public Member Functions inherited from OpenCVForUnity.DisposableObject
static IntPtr	ThrowIfNullIntPtr (IntPtr ptr)

Protected Member Functions
override void	Dispose (bool disposing)
Protected Member Functions inherited from OpenCVForUnity.Features2dModule.Feature2D
Protected Member Functions inherited from OpenCVForUnity.CoreModule.Algorithm
Protected Member Functions inherited from OpenCVForUnity.DisposableOpenCVObject
	DisposableOpenCVObject ()
	DisposableOpenCVObject (bool isEnabledDispose)
	DisposableOpenCVObject (IntPtr ptr)
	DisposableOpenCVObject (IntPtr ptr, bool isEnabledDispose)
Protected Member Functions inherited from OpenCVForUnity.DisposableObject
	DisposableObject ()
	DisposableObject (bool isEnabledDispose)

Additional Inherited Members
Package Functions inherited from OpenCVForUnity.Features2dModule.Feature2D
Package Functions inherited from OpenCVForUnity.CoreModule.Algorithm
Package Attributes inherited from OpenCVForUnity.DisposableOpenCVObject
Properties inherited from OpenCVForUnity.DisposableObject
bool	IsDisposed [get, protected set]
bool	IsEnabledDispose [get, set]

Detailed Description

Class for extracting blobs from an image. :

The class implements a simple algorithm for extracting blobs from an image:

1. Convert the source image to binary images by applying thresholding with several thresholds from minThreshold (inclusive) to maxThreshold (exclusive) with distance thresholdStep between neighboring thresholds.
2. Extract connected components from every binary image by findContours and calculate their centers.
3. Group centers from several binary images by their coordinates. Close centers form one group that corresponds to one blob, which is controlled by the minDistBetweenBlobs parameter.
4. From the groups, estimate final centers of blobs and their radiuses and return as locations and sizes of keypoints.

This class performs several filtrations of returned blobs. You should set filterBy* to true/false to turn on/off corresponding filtration. Available filtrations:

• By color. This filter compares the intensity of a binary image at the center of a blob to blobColor. If they differ, the blob is filtered out. Use blobColor = 0 to extract dark blobs and blobColor = 255 to extract light blobs.
• By area. Extracted blobs have an area between minArea (inclusive) and maxArea (exclusive).
• By circularity. Extracted blobs have circularity ( $\$\frac{4\ast \pi \ast Area}{perimeter\ast perimeter}$$) between minCircularity (inclusive) and maxCircularity (exclusive).
• By ratio of the minimum inertia to maximum inertia. Extracted blobs have this ratio between minInertiaRatio (inclusive) and maxInertiaRatio (exclusive).
• By convexity. Extracted blobs have convexity (area / area of blob convex hull) between minConvexity (inclusive) and maxConvexity (exclusive).

Default values of parameters are tuned to extract dark circular blobs.

Member Function Documentation

__fromPtr__()

static new SimpleBlobDetector OpenCVForUnity.Features2dModule.SimpleBlobDetector.__fromPtr__ ( IntPtr addr )

static

create() [1/2]

static SimpleBlobDetector OpenCVForUnity.Features2dModule.SimpleBlobDetector.create ( )

static

create() [2/2]

static SimpleBlobDetector OpenCVForUnity.Features2dModule.SimpleBlobDetector.create ( SimpleBlobDetector_Params parameters )

static

Dispose()

override void OpenCVForUnity.Features2dModule.SimpleBlobDetector.Dispose ( bool disposing )

protectedvirtual

Reimplemented from OpenCVForUnity.Features2dModule.Feature2D.

getBlobContours()

List< MatOfPoint > OpenCVForUnity.Features2dModule.SimpleBlobDetector.getBlobContours

(

)

getDefaultName()

override string OpenCVForUnity.Features2dModule.SimpleBlobDetector.getDefaultName ( )

virtual

Returns the algorithm string identifier. This string is used as top level xml/yml node tag when the object is saved to a file or string.

Reimplemented from OpenCVForUnity.Features2dModule.Feature2D.

getParams()

SimpleBlobDetector_Params OpenCVForUnity.Features2dModule.SimpleBlobDetector.getParams

(

)

setParams()

void OpenCVForUnity.Features2dModule.SimpleBlobDetector.setParams

(

SimpleBlobDetector_Params

_params

)

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The documentation for this class was generated from the following file:

• OpenCVForUnity/Assets/OpenCVForUnity/org/opencv/features2d/SimpleBlobDetector.cs