opencv/modules/imgproc/test/test_lsd.cpp

// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
#include "test_precomp.hpp"

namespace opencv_test { namespace {

const Size img_size(640, 480);
const int LSD_TEST_SEED = 0x134679;
const int EPOCHS = 20;

class LSDBase : public testing::Test
{
public:
    LSDBase() { }

protected:
    Mat test_image;
    vector<Vec4f> lines;
    RNG rng;
    int passedtests;

    void GenerateWhiteNoise(Mat& image);
    void GenerateConstColor(Mat& image);
    void GenerateLines(Mat& image, const unsigned int numLines);
    void GenerateRotatedRect(Mat& image);
    virtual void SetUp();
};

class Imgproc_LSD_ADV: public LSDBase
{
public:
    Imgproc_LSD_ADV() { }
protected:

};

class Imgproc_LSD_STD: public LSDBase
{
public:
    Imgproc_LSD_STD() { }
protected:

};

class Imgproc_LSD_NONE: public LSDBase
{
public:
    Imgproc_LSD_NONE() { }
protected:

};

class Imgproc_LSD_Common : public LSDBase
{
public:
    Imgproc_LSD_Common() { }
protected:

};

void LSDBase::GenerateWhiteNoise(Mat& image)
{
    image = Mat(img_size, CV_8UC1);
    rng.fill(image, RNG::UNIFORM, 0, 256);
}

void LSDBase::GenerateConstColor(Mat& image)
{
    image = Mat(img_size, CV_8UC1, Scalar::all(rng.uniform(0, 256)));
}

void LSDBase::GenerateLines(Mat& image, const unsigned int numLines)
{
    image = Mat(img_size, CV_8UC1, Scalar::all(rng.uniform(0, 128)));

    for(unsigned int i = 0; i < numLines; ++i)
    {
        int y = rng.uniform(10, img_size.width - 10);
        Point p1(y, 10);
        Point p2(y, img_size.height - 10);
        line(image, p1, p2, Scalar(255), 3);
    }
}

void LSDBase::GenerateRotatedRect(Mat& image)
{
    image = Mat::zeros(img_size, CV_8UC1);

    Point center(rng.uniform(img_size.width/4, img_size.width*3/4),
                 rng.uniform(img_size.height/4, img_size.height*3/4));
    Size rect_size(rng.uniform(img_size.width/8, img_size.width/6),
                   rng.uniform(img_size.height/8, img_size.height/6));
    float angle = rng.uniform(0.f, 360.f);

    Point2f vertices[4];

    RotatedRect rRect = RotatedRect(center, rect_size, angle);

    rRect.points(vertices);
    for (int i = 0; i < 4; i++)
    {
        line(image, vertices[i], vertices[(i + 1) % 4], Scalar(255), 3);
    }
}

void LSDBase::SetUp()
{
    lines.clear();
    test_image = Mat();
    rng = RNG(LSD_TEST_SEED);
    passedtests = 0;
}


TEST_F(Imgproc_LSD_ADV, whiteNoise)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateWhiteNoise(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_ADV);
        detector->detect(test_image, lines);

        if(40u >= lines.size()) ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_ADV, constColor)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateConstColor(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_ADV);
        detector->detect(test_image, lines);

        if(0u == lines.size()) ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_ADV, lines)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        const unsigned int numOfLines = 1;
        GenerateLines(test_image, numOfLines);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_ADV);
        detector->detect(test_image, lines);

        if(numOfLines * 2 == lines.size()) ++passedtests;  // * 2 because of Gibbs effect
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_ADV, rotatedRect)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateRotatedRect(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_ADV);
        detector->detect(test_image, lines);

        if(2u <= lines.size())  ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_STD, whiteNoise)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateWhiteNoise(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);
        detector->detect(test_image, lines);

        if(50u >= lines.size()) ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_STD, constColor)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateConstColor(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);
        detector->detect(test_image, lines);

        if(0u == lines.size()) ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_STD, lines)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        const unsigned int numOfLines = 1;
        GenerateLines(test_image, numOfLines);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);
        detector->detect(test_image, lines);

        if(numOfLines * 2 == lines.size()) ++passedtests;  // * 2 because of Gibbs effect
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_STD, rotatedRect)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateRotatedRect(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);
        detector->detect(test_image, lines);

        if(4u <= lines.size()) ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_NONE, whiteNoise)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateWhiteNoise(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);
        detector->detect(test_image, lines);

        if(50u >= lines.size()) ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_NONE, constColor)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateConstColor(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_NONE);
        detector->detect(test_image, lines);

        if(0u == lines.size()) ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_NONE, lines)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        const unsigned int numOfLines = 1;
        GenerateLines(test_image, numOfLines);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_NONE);
        detector->detect(test_image, lines);

        if(numOfLines * 2 == lines.size()) ++passedtests;  // * 2 because of Gibbs effect
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_NONE, rotatedRect)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateRotatedRect(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_NONE);
        detector->detect(test_image, lines);

        if(8u <= lines.size()) ++passedtests;
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_Common, supportsVec4iResult)
{
    for (int i = 0; i < EPOCHS; ++i)
    {
        GenerateWhiteNoise(test_image);
        Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);
        detector->detect(test_image, lines);

        std::vector<Vec4i> linesVec4i;
        detector->detect(test_image, linesVec4i);

        if (lines.size() == linesVec4i.size())
        {
            bool pass = true;
            for (size_t lineIndex = 0; pass && lineIndex < lines.size(); lineIndex++)
            {
                for (int ch = 0; ch < 4; ch++)
                {
                    if (cv::saturate_cast<int>(lines[lineIndex][ch]) != linesVec4i[lineIndex][ch])
                    {
                        pass = false;
                        break;
                    }
                }
            }
            if (pass)
                ++passedtests;
        }
    }
    ASSERT_EQ(EPOCHS, passedtests);
}

TEST_F(Imgproc_LSD_Common, drawSegmentsVec4f)
{
    GenerateConstColor(test_image);

    std::vector<Vec4f> linesVec4f;
    RNG cr(0); // constant seed for deterministic test
    for (int j = 0; j < 10; j++) {
        linesVec4f.push_back(
            Vec4f(float(cr) * test_image.cols, float(cr) * test_image.rows, float(cr) * test_image.cols, float(cr) * test_image.rows));
    }

    Mat actual = Mat::zeros(test_image.size(), CV_8UC3);
    Mat expected = Mat::zeros(test_image.size(), CV_8UC3);

    Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);
    detector->drawSegments(actual, linesVec4f);

    // something should be drawn
    ASSERT_EQ(sum(actual == expected) != Scalar::all(0), true);

    for (size_t lineIndex = 0; lineIndex < linesVec4f.size(); lineIndex++)
    {
        const Vec4f &v = linesVec4f[lineIndex];
        const Point2f b(v[0], v[1]);
        const Point2f e(v[2], v[3]);
        line(expected, b, e, Scalar(0, 0, 255), 1);
    }

    ASSERT_EQ(sum(actual != expected) == Scalar::all(0), true);
}

TEST_F(Imgproc_LSD_Common, drawSegmentsVec4i)
{
    GenerateConstColor(test_image);

    std::vector<Vec4i> linesVec4i;
    RNG cr(0); // constant seed for deterministic test
    for (int j = 0; j < 10; j++) {
        linesVec4i.push_back(
            Vec4i(cr(test_image.cols), cr(test_image.rows), cr(test_image.cols), cr(test_image.rows)));
    }

    Mat actual = Mat::zeros(test_image.size(), CV_8UC3);
    Mat expected = Mat::zeros(test_image.size(), CV_8UC3);

    Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);
    detector->drawSegments(actual, linesVec4i);

    // something should be drawn
    ASSERT_EQ(sum(actual == expected) != Scalar::all(0), true);

    for (size_t lineIndex = 0; lineIndex < linesVec4i.size(); lineIndex++)
    {
        const Vec4f &v = linesVec4i[lineIndex];
        const Point2f b(v[0], v[1]);
        const Point2f e(v[2], v[3]);
        line(expected, b, e, Scalar(0, 0, 255), 1);
    }

    ASSERT_EQ(sum(actual != expected) == Scalar::all(0), true);
}

TEST_F(Imgproc_LSD_Common, compareSegmentsVec4f)
{
    GenerateConstColor(test_image);
    Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);

    std::vector<Vec4f> lines1, lines2;
    lines1.push_back(Vec4f(0, 0, 100, 200));
    lines2.push_back(Vec4f(0, 0, 100, 200));
    int result1 = detector->compareSegments(test_image.size(), lines1, lines2);

    ASSERT_EQ(result1, 0);

    lines2.push_back(Vec4f(100, 100, 110, 100));
    int result2 = detector->compareSegments(test_image.size(), lines1, lines2);

    ASSERT_EQ(result2, 11);
}

TEST_F(Imgproc_LSD_Common, compareSegmentsVec4i)
{
    GenerateConstColor(test_image);
    Ptr<LineSegmentDetector> detector = createLineSegmentDetector(LSD_REFINE_STD);

    std::vector<Vec4i> lines1, lines2;
    lines1.push_back(Vec4i(0, 0, 100, 200));
    lines2.push_back(Vec4i(0, 0, 100, 200));
    int result1 = detector->compareSegments(test_image.size(), lines1, lines2);

    ASSERT_EQ(result1, 0);

    lines2.push_back(Vec4i(100, 100, 110, 100));
    int result2 = detector->compareSegments(test_image.size(), lines1, lines2);

    ASSERT_EQ(result2, 11);
}

}} // namespace