Structural Analysis and Shape Descriptors

Select a filter from the list below.

Icon	Name	Description
	cvApproxPolyDP	Approximates polygonal curve(s) with the specified precision.
	cvArcLength	Calculates a contour perimeter or a curve length.
	cvBoundingRect	Calculates the up-right bounding rectangle of a point set.
	cvConnectedComponents	Computes the connected components labeled image of boolean image.
	cvContourArea	Calculates the contour area.
	cvConvexHull	Finds the convex hull of a point set.
	cvDrawContours	Draws contour outlines or filled contours.
	cvFindContours	Finds the contours in a binary image.
	cvFitEllipse	Fits an ellipse around a set of 2D points.
	cvFitLine	Fits a line to a 2D or 3D point set.
	cvHuMoments	Calculates Hu moments of the image.
	cvIsContourConvex	Tests contour convexity.
	cvMatchShapes_Images	Compares two shapes.
	cvMatchShapes_Shapes	Compares two shapes.
	cvMinAreaRect	Finds a rotated rectangle of the minimum area enclosing the input 2D point set.
	cvMinEnclosingCircle	Finds the minimum area circle enclosing a 2D point set.
	cvMinEnclosingTriangle	Finds a rotated rectangle of the minimum area enclosing the input 2D point set.
	cvMoments	Calculates image moments.
	cvPointPolygonTest	Performs point-in-contour test.