opencv/modules/imgproc/test/test_approxpoly.cpp

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#include "test_precomp.hpp"

namespace opencv_test { namespace {

//
// TODO!!!:
//  check_slice (and/or check) seem(s) to be broken, or this is a bug in function
//  (or its inability to handle possible self-intersections in the generated contours).
//
//  At least, if // return TotalErrors;
//  is uncommented in check_slice, the test fails easily.
//  So, now (and it looks like since 0.9.6)
//  we only check that the set of vertices of the approximated polygon is
//  a subset of vertices of the original contour.
//

//Tests to make sure that unreasonable epsilon (error)
//values never get passed to the Douglas-Peucker algorithm.
TEST(Imgproc_ApproxPoly, bad_epsilon)
{
    std::vector<Point2f> inputPoints;
    inputPoints.push_back(Point2f(0.0f, 0.0f));
    std::vector<Point2f> outputPoints;

    double eps = std::numeric_limits<double>::infinity();
    ASSERT_ANY_THROW(approxPolyDP(inputPoints, outputPoints, eps, false));

    eps = 9e99;
    ASSERT_ANY_THROW(approxPolyDP(inputPoints, outputPoints, eps, false));

    eps = -1e-6;
    ASSERT_ANY_THROW(approxPolyDP(inputPoints, outputPoints, eps, false));

    eps = NAN;
    ASSERT_ANY_THROW(approxPolyDP(inputPoints, outputPoints, eps, false));
}

}} // namespace