opencv/modules/imgproc/test/test_cornersubpix.cpp

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#include "test_precomp.hpp"

namespace opencv_test { namespace {

TEST(Imgproc_CornerSubPix, out_of_image_corners)
{
    const uint8_t image_pixels[] = {
        0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 1,
        0, 0, 0, 0, 0, 0, 2,
        0, 0, 0, 0, 0, 0, 3};

    cv::Mat image(cv::Size(7, 7), CV_8UC1, (void*)image_pixels, cv::Mat::AUTO_STEP);
    std::vector<cv::Point2f> corners = {cv::Point2f(5.25, 6.5)};
    cv::Size win(1, 1);
    cv::Size zeroZone(-1, -1);
    cv::TermCriteria criteria;
    cv::cornerSubPix(image, corners, win, zeroZone, criteria);

    ASSERT_EQ(corners.size(), 1u);
    ASSERT_TRUE(Rect(0, 0, image.cols, image.rows).contains(corners.front()));
}

// See https://github.com/opencv/opencv/issues/26016
TEST(Imgproc_CornerSubPix, corners_on_the_edge)
{
    cv::Mat image(500, 500, CV_8UC1);
    cv::Size win(1, 1);
    cv::Size zeroZone(-1, -1);
    cv::TermCriteria criteria;

    std::vector<cv::Point2f> cornersOK1 = { cv::Point2f(250, std::nextafter(499.5f, 499.5f - 1.0f)) };
    EXPECT_NO_THROW( cv::cornerSubPix(image, cornersOK1, win, zeroZone, criteria) ) << cornersOK1;

    std::vector<cv::Point2f> cornersOK2 = { cv::Point2f(250, 499.5f) };
    EXPECT_NO_THROW( cv::cornerSubPix(image, cornersOK2, win, zeroZone, criteria) ) << cornersOK2;

    std::vector<cv::Point2f> cornersOK3 = { cv::Point2f(250, std::nextafter(499.5f, 499.5f + 1.0f)) };
    EXPECT_NO_THROW( cv::cornerSubPix(image, cornersOK3, win, zeroZone, criteria) ) << cornersOK3;

    std::vector<cv::Point2f> cornersOK4 = { cv::Point2f(250, std::nextafter(500.0f, 500.0f - 1.0f)) };
    EXPECT_NO_THROW( cv::cornerSubPix(image, cornersOK4, win, zeroZone, criteria) ) << cornersOK4;

    std::vector<cv::Point2f> cornersNG1 = { cv::Point2f(250, 500.0f) };
    EXPECT_ANY_THROW( cv::cornerSubPix(image, cornersNG1, win, zeroZone, criteria) ) << cornersNG1;

    std::vector<cv::Point2f> cornersNG2 = { cv::Point2f(250, std::nextafter(500.0f, 500.0f + 1.0f)) };
    EXPECT_ANY_THROW( cv::cornerSubPix(image, cornersNG2, win, zeroZone, criteria) ) << cornersNG2;
}

}} // namespace