Cv.FindContours Method (CvArr, CvMemStorage, CvSeq(CvPoint), Int32, ContourRetrieval, ContourChain, CvPoint)

CvFindContours Method (CvArr, CvMemStorage, CvSeqCvPoint, Int32, ContourRetrieval, ContourChain, CvPoint)

OpenCvSharp Class Library

Retrieves contours from the binary image and returns the number of retrieved contours.

Namespace: OpenCvSharp
Assembly: OpenCvSharp (in OpenCvSharp.dll) Version: 1.0.0.0 (1.0.0.0)

Syntax

public static int FindContours(
	CvArr image,
	CvMemStorage storage,
	out CvSeq<CvPoint> firstContour,
	int headerSize,
	ContourRetrieval mode,
	ContourChain method,
	CvPoint offset
)

Public Shared Function FindContours ( 
	image As CvArr,
	storage As CvMemStorage,
	<OutAttribute> ByRef firstContour As CvSeq(Of CvPoint),
	headerSize As Integer,
	mode As ContourRetrieval,
	method As ContourChain,
	offset As CvPoint
) As Integer

public:
static int FindContours(
	CvArr^ image, 
	CvMemStorage^ storage, 
	[OutAttribute] CvSeq<CvPoint>^% firstContour, 
	int headerSize, 
	ContourRetrieval mode, 
	ContourChain method, 
	CvPoint offset
)

static member FindContours : 
        image : CvArr * 
        storage : CvMemStorage * 
        firstContour : CvSeq<CvPoint> byref * 
        headerSize : int * 
        mode : ContourRetrieval * 
        method : ContourChain * 
        offset : CvPoint -> int

Parameters

image: Type: OpenCvSharpCvArr
The source 8-bit single channel image. Non-zero pixels are treated as 1’s, zero pixels remain 0’s - that is image treated as binary. To get such a binary image from grayscale, one may use cvThreshold, cvAdaptiveThreshold or cvCanny. The function modifies the source image content.
storage: Type: OpenCvSharpCvMemStorage
Container of the retrieved contours.
firstContour: Type: OpenCvSharpCvSeqCvPoint
Output parameter, will contain the pointer to the first outer contour.
headerSize: Type: SystemInt32
Size of the sequence header, >=sizeof(CvChain) if method=CV_CHAIN_CODE, and >=sizeof(CvContour) otherwise.
mode: Type: OpenCvSharpContourRetrieval
Retrieval mode.
method: Type: OpenCvSharpContourChain
Approximation method.
offset: Type: OpenCvSharpCvPoint
Offset, by which every contour point is shifted. This is useful if the contours are extracted from the image ROI and then they should be analyzed in the whole image context.

Return Value

Type: Int32
The number of retrieved contours.

Reference

Cv Class

FindContours Overload

OpenCvSharp Namespace