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/modules/gapi/perf/perf_bench.cpp

@@ -0,0 +1,88 @@
+#include "perf_precomp.hpp"
+#include "../test/common/gapi_tests_common.hpp"
+
+namespace opencv_test
+{
+
+struct SobelEdgeDetector:  public TestPerfParams<cv::Size> {};
+PERF_TEST_P_(SobelEdgeDetector, Fluid)
+{
+    Size sz = GetParam();
+    initMatsRandU(CV_8UC3, sz, CV_8UC3, false);
+
+    GMat in;
+    GMat gx  = gapi::Sobel(in, CV_32F, 1, 0);
+    GMat gy  = gapi::Sobel(in, CV_32F, 0, 1);
+    GMat mag = gapi::sqrt(gapi::mul(gx, gx) + gapi::mul(gy, gy));
+    GMat out = gapi::convertTo(mag, CV_8U);
+    GComputation sobel(in, out);
+    auto pkg = gapi::combine(gapi::core::fluid::kernels(),
+                             gapi::imgproc::fluid::kernels());
+    auto cc = sobel.compile(cv::descr_of(in_mat1),
+                            cv::compile_args(cv::gapi::use_only{pkg}));
+    cc(in_mat1, out_mat_gapi);
+
+    TEST_CYCLE()
+    {
+        cc(in_mat1, out_mat_gapi);
+    }
+    SANITY_CHECK_NOTHING();
+}
+PERF_TEST_P_(SobelEdgeDetector, OpenCV)
+{
+    Size sz = GetParam();
+    initMatsRandU(CV_8UC3, sz, CV_8UC3, false);
+
+    Mat gx, gy;
+    Mat mag;
+    auto cc = [&](const cv::Mat &in_mat, cv::Mat &out_mat) {
+        using namespace cv;
+
+        Sobel(in_mat, gx, CV_32F, 1, 0);
+        Sobel(in_mat, gy, CV_32F, 0, 1);
+        sqrt(gx.mul(gx) + gy.mul(gy), mag);
+        mag.convertTo(out_mat, CV_8U);
+    };
+    cc(in_mat1, out_mat_gapi);
+
+    TEST_CYCLE()
+    {
+        cc(in_mat1, out_mat_gapi);
+    }
+    SANITY_CHECK_NOTHING();
+}
+PERF_TEST_P_(SobelEdgeDetector, OpenCV_Smarter)
+{
+    Size sz = GetParam();
+    initMatsRandU(CV_8UC3, sz, CV_8UC3, false);
+
+    Mat gx, gy;
+    Mat ggx, ggy;
+    Mat sum;
+    Mat mag;
+
+    auto cc = [&](const cv::Mat &in_mat, cv::Mat &out_mat) {
+        cv::Sobel(in_mat, gx, CV_32F, 1, 0);
+        cv::Sobel(in_mat, gy, CV_32F, 0, 1);
+        cv::multiply(gx, gx, ggx);
+        cv::multiply(gy, gy, ggy);
+        cv::add(ggx, ggy, sum);
+        cv::sqrt(sum, mag);
+        mag.convertTo(out_mat, CV_8U);
+    };
+    cc(in_mat1, out_mat_gapi);
+
+    TEST_CYCLE()
+    {
+        cc(in_mat1, out_mat_gapi);
+    }
+    SANITY_CHECK_NOTHING();
+}
+INSTANTIATE_TEST_CASE_P(Benchmark, SobelEdgeDetector,
+                        Values(cv::Size(320, 240),
+                               cv::Size(640, 480),
+                               cv::Size(1280, 720),
+                               cv::Size(1920, 1080),
+                               cv::Size(3840, 2170)));
+
+} // opencv_test