opencv/modules/gpu/test/test_labeling.cpp

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#include "precomp.hpp"
#include <string>
#include <iostream>

struct Labeling : testing::TestWithParam<cv::gpu::DeviceInfo>
{
    cv::gpu::DeviceInfo devInfo;

    virtual void SetUp()
    {
        devInfo = GetParam();
        cv::gpu::setDevice(devInfo.deviceID());
    }

    cv::Mat loat_image()
    {
        return cv::imread(std::string( cvtest::TS::ptr()->get_data_path() ) + "labeling/label.png");
    }
};

TEST_P(Labeling, ConnectedComponents)
{
    cv::Mat image;
    cvtColor(loat_image(), image, CV_BGR2GRAY);

    cv::gpu::GpuMat mask;
    mask.create(image.rows, image.cols, CV_8UC1);

    cv::gpu::GpuMat components;
    components.create(image.rows, image.cols, CV_32SC1);

    cv::gpu::connectivityMask(cv::gpu::GpuMat(image), mask, cv::Scalar::all(0), cv::Scalar::all(2));

    cv::gpu::labelComponents(mask, components);

    // std::cout << cv::Mat(components) << std::endl;
    // cv::imshow("test", image);
    // cv::waitKey(0);

    // for(int i = 0; i + 32 < image.rows; i += 32)
    //     for(int j = 0; j + 32 < image.cols; j += 32)
    //         cv::rectangle(image, cv::Rect(j, i, 32, 32) , CV_RGB(255, 255, 255));

    cv::imshow("test", image);
    cv::waitKey(0);
    cv::imshow("test", cv::Mat(mask) * 10);
    cv::waitKey(0);
    cv::imshow("test", cv::Mat(components) * 2);
    cv::waitKey(0);
}

INSTANTIATE_TEST_CASE_P(ConnectedComponents, Labeling, ALL_DEVICES);