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Tetragramm
GitHub Repository: Tetragramm/opencv
 Path: blob/master/modules/imgproc/test/test_fitellipse.cpp
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// This file is part of OpenCV project.

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// It is subject to the license terms in the LICENSE file found in the top-level directory

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// of this distribution and at http://opencv.org/license.html.

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//

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// Copyright (C) 2016, Itseez, Inc, all rights reserved.

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#include "test_precomp.hpp"

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namespace opencv_test { namespace {

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// return true if point lies inside ellipse

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static bool check_pt_in_ellipse(const Point2f& pt, const RotatedRect& el) {

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    Point2f to_pt = pt - el.center;

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    double pt_angle = atan2(to_pt.y, to_pt.x);

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    double el_angle = el.angle * CV_PI / 180;

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    double x_dist = 0.5 * el.size.width * cos(pt_angle + el_angle);

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    double y_dist = 0.5 * el.size.height * sin(pt_angle + el_angle);

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    double el_dist = sqrt(x_dist * x_dist + y_dist * y_dist);

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    return cv::norm(to_pt) < el_dist;

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}

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// Return true if mass center of fitted points lies inside ellipse

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static bool fit_and_check_ellipse(const vector<Point2f>& pts) {

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    RotatedRect ellipse = fitEllipseDirect(pts); // fitEllipseAMS() also works fine

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    Point2f mass_center;

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    for (size_t i = 0; i < pts.size(); i++) {

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        mass_center += pts[i];

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    }

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    mass_center /= (float)pts.size();

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    return check_pt_in_ellipse(mass_center, ellipse);

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}

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TEST(Imgproc_FitEllipse_Issue_4515, accuracy) {

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    vector<Point2f> pts;

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    pts.push_back(Point2f(327, 317));

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    pts.push_back(Point2f(328, 316));

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    pts.push_back(Point2f(329, 315));

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    pts.push_back(Point2f(330, 314));

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    pts.push_back(Point2f(331, 314));

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    pts.push_back(Point2f(332, 314));

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    pts.push_back(Point2f(333, 315));

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    pts.push_back(Point2f(333, 316));

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    pts.push_back(Point2f(333, 317));

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    pts.push_back(Point2f(333, 318));

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    pts.push_back(Point2f(333, 319));

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    pts.push_back(Point2f(333, 320));

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    EXPECT_TRUE(fit_and_check_ellipse(pts));

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}

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TEST(Imgproc_FitEllipse_Issue_6544, accuracy) {

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    vector<Point2f> pts;

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    pts.push_back(Point2f(924.784f, 764.160f));

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    pts.push_back(Point2f(928.388f, 615.903f));

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    pts.push_back(Point2f(847.4f,   888.014f));

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    pts.push_back(Point2f(929.406f, 741.675f));

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    pts.push_back(Point2f(904.564f, 825.605f));

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    pts.push_back(Point2f(926.742f, 760.746f));

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    pts.push_back(Point2f(863.479f, 873.406f));

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    pts.push_back(Point2f(910.987f, 808.863f));

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    pts.push_back(Point2f(929.145f, 744.976f));

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    pts.push_back(Point2f(917.474f, 791.823f));

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    EXPECT_TRUE(fit_and_check_ellipse(pts));

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}

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}} // namespace

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