Cv2DrawContours Method (InputOutputArray, IEnumerableMat, Int32, Scalar, Int32, LineType, Mat, Int32, NullablePoint) OpenCvSharp Class Library
draws contours in the image

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

public static void DrawContours(
	InputOutputArray image,
	IEnumerable<Mat> contours,
	int contourIdx,
	Scalar color,
	int thickness = 1,
	LineType lineType = LineType.Link8,
	Mat hierarchy = null,
	int maxLevel = 2147483647,
	Nullable<Point> offset = null
)

Parameters

image
Type: OpenCvSharp.CPlusPlusInputOutputArray
Destination image.
contours
Type: System.Collections.GenericIEnumerableMat
All the input contours. Each contour is stored as a point vector.
contourIdx
Type: SystemInt32
Parameter indicating a contour to draw. If it is negative, all the contours are drawn.
color
Type: OpenCvSharp.CPlusPlusScalar
Color of the contours.
thickness (Optional)
Type: SystemInt32
Thickness of lines the contours are drawn with. If it is negative (for example, thickness=CV_FILLED ), the contour interiors are drawn.
lineType (Optional)
Type: OpenCvSharpLineType
Line connectivity.
hierarchy (Optional)
Type: OpenCvSharp.CPlusPlusMat
Optional information about hierarchy. It is only needed if you want to draw only some of the contours
maxLevel (Optional)
Type: SystemInt32
Maximal level for drawn contours. If it is 0, only the specified contour is drawn. If it is 1, the function draws the contour(s) and all the nested contours. If it is 2, the function draws the contours, all the nested contours, all the nested-to-nested contours, and so on. This parameter is only taken into account when there is hierarchy available.
offset (Optional)
Type: SystemNullablePoint
Optional contour shift parameter. Shift all the drawn contours by the specified offset = (dx, dy)
See Also

Reference