feat: 切换后端至PaddleOCR-NCNN，切换工程为CMake

1.项目后端整体迁移至PaddleOCR-NCNN算法，已通过基本的兼容性测试
2.工程改为使用CMake组织，后续为了更好地兼容第三方库，不再提供QMake工程
3.重整权利声明文件，重整代码工程，确保最小化侵权风险

Log: 切换后端至PaddleOCR-NCNN，切换工程为CMake
Change-Id: I4d5d2c5d37505a4a24b389b1a4c5d12f17bfa38c

3rdparty/opencv-4.5.4/samples/gpu/surf_keypoint_matcher.cpp

@@ -0,0 +1,96 @@
+#include <iostream>
+
+#include "opencv2/opencv_modules.hpp"
+
+#ifdef HAVE_OPENCV_XFEATURES2D
+
+#include "opencv2/core.hpp"
+#include "opencv2/features2d.hpp"
+#include "opencv2/highgui.hpp"
+#include "opencv2/cudafeatures2d.hpp"
+#include "opencv2/xfeatures2d/cuda.hpp"
+
+using namespace std;
+using namespace cv;
+using namespace cv::cuda;
+
+static void help()
+{
+    cout << "\nThis program demonstrates using SURF_CUDA features detector, descriptor extractor and BruteForceMatcher_CUDA" << endl;
+    cout << "\nUsage:\n\tsurf_keypoint_matcher --left <image1> --right <image2>" << endl;
+}
+
+int main(int argc, char* argv[])
+{
+    if (argc != 5)
+    {
+        help();
+        return -1;
+    }
+
+    GpuMat img1, img2;
+    for (int i = 1; i < argc; ++i)
+    {
+        if (string(argv[i]) == "--left")
+        {
+            img1.upload(imread(argv[++i], IMREAD_GRAYSCALE));
+            CV_Assert(!img1.empty());
+        }
+        else if (string(argv[i]) == "--right")
+        {
+            img2.upload(imread(argv[++i], IMREAD_GRAYSCALE));
+            CV_Assert(!img2.empty());
+        }
+        else if (string(argv[i]) == "--help")
+        {
+            help();
+            return -1;
+        }
+    }
+
+    cv::cuda::printShortCudaDeviceInfo(cv::cuda::getDevice());
+
+    SURF_CUDA surf;
+
+    // detecting keypoints & computing descriptors
+    GpuMat keypoints1GPU, keypoints2GPU;
+    GpuMat descriptors1GPU, descriptors2GPU;
+    surf(img1, GpuMat(), keypoints1GPU, descriptors1GPU);
+    surf(img2, GpuMat(), keypoints2GPU, descriptors2GPU);
+
+    cout << "FOUND " << keypoints1GPU.cols << " keypoints on first image" << endl;
+    cout << "FOUND " << keypoints2GPU.cols << " keypoints on second image" << endl;
+
+    // matching descriptors
+    Ptr<cv::cuda::DescriptorMatcher> matcher = cv::cuda::DescriptorMatcher::createBFMatcher(surf.defaultNorm());
+    vector<DMatch> matches;
+    matcher->match(descriptors1GPU, descriptors2GPU, matches);
+
+    // downloading results
+    vector<KeyPoint> keypoints1, keypoints2;
+    vector<float> descriptors1, descriptors2;
+    surf.downloadKeypoints(keypoints1GPU, keypoints1);
+    surf.downloadKeypoints(keypoints2GPU, keypoints2);
+    surf.downloadDescriptors(descriptors1GPU, descriptors1);
+    surf.downloadDescriptors(descriptors2GPU, descriptors2);
+
+    // drawing the results
+    Mat img_matches;
+    drawMatches(Mat(img1), keypoints1, Mat(img2), keypoints2, matches, img_matches);
+
+    namedWindow("matches", 0);
+    imshow("matches", img_matches);
+    waitKey(0);
+
+    return 0;
+}
+
+#else
+
+int main()
+{
+    std::cerr << "OpenCV was built without xfeatures2d module" << std::endl;
+    return 0;
+}
+
+#endif