Mat.ConvexityDefects Method

MatConvexityDefects Method

OpenCvSharp Class Library

Computes the contour convexity defects

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

Syntax

C++

Copy

public Mat ConvexityDefects(
	InputArray convexHull
)

Public Function ConvexityDefects ( 
	convexHull As InputArray
) As Mat

public:
Mat^ ConvexityDefects(
	InputArray^ convexHull
)

member ConvexityDefects : 
        convexHull : InputArray -> Mat

Parameters

convexHull: Type: OpenCvSharp.CPlusPlusInputArray
Convex hull obtained using convexHull() that should contain indices of the contour points that make the hull.

Return Value

Type: Mat
The output vector of convexity defects. Each convexity defect is represented as 4-element integer vector (a.k.a. cv::Vec4i): (start_index, end_index, farthest_pt_index, fixpt_depth), where indices are 0-based indices in the original contour of the convexity defect beginning, end and the farthest point, and fixpt_depth is fixed-point approximation (with 8 fractional bits) of the distance between the farthest contour point and the hull. That is, to get the floating-point value of the depth will be fixpt_depth/256.0.

Reference

Mat Class

OpenCvSharp.CPlusPlus Namespace