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/semihosting/CMakeLists.txt

@@ -0,0 +1,10 @@
+# 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
+
+set(SEMIHOSTING_SUFFIX semihosting)
+
+add_subdirectory(include)
+set(RAW_PIXEL_INCLUDE ${CMAKE_CURRENT_BINARY_DIR}/include)
+add_subdirectory(histogram)
+add_subdirectory(norm)

3rdparty/opencv-4.5.4/samples/semihosting/README.md

@@ -0,0 +1,27 @@
+# Arm semihosting
+
+This folder contain a toolchain file and a couple of examples for
+building OpenCV based applications that can run in an [Arm
+semihosting](https://developer.arm.com/documentation/100863/latest)
+setup.
+
+OpenCV can be compiled to target a semihosting platform as follows:
+
+```
+cmake ../opencv/ \
+    -DCMAKE_TOOLCHAIN_FILE=../opencv/platforms/semihosting/aarch64-semihosting.toolchain.cmake \
+    -DSEMIHOSTING_TOOLCHAIN_PATH=/path/to/baremetal-toolchain/bin/ \
+    -DBUILD_EXAMPLES=ON -GNinja
+```
+
+A barematel toolchain for targeting aarch64 semihosting can be found
+[here](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads),
+under `aarch64-none-elf`.
+
+The code of the examples in the `norm` and `histogram` folders can be
+executed with qemu in Linux userspace:
+
+```
+    qemu-aarch64 ./bin/example_semihosting_histogram
+    qemu-aarch64 ./bin/example_semihosting_norm
+```

3rdparty/opencv-4.5.4/samples/semihosting/histogram/CMakeLists.txt

@@ -0,0 +1,26 @@
+# 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
+
+set(PROJECT_NAME histogram)
+project(${PROJECT_NAME})
+
+ocv_install_example_src(histogram *.cpp *.hpp CMakeLists.txt)
+
+set(LOCAL_DEPS
+  opencv_core
+  opencv_imgproc
+  ${OPENCV_MODULES_PUBLIC}
+  ${OpenCV_LIB_COMPONENTS})
+ocv_check_dependencies(${LOCAL_DEPS})
+
+if(NOT OCV_DEPENDENCIES_FOUND)
+  return()
+endif()
+
+ocv_define_sample(histogram histogram.cpp ${SEMIHOSTING_SUFFIX})
+ocv_include_modules_recurse(${LOCAL_DEPS})
+target_include_directories(${histogram} PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+target_include_directories(${histogram} PRIVATE ${RAW_PIXEL_INCLUDE})
+ocv_target_link_libraries(${histogram} PRIVATE ${OPENCV_LINKER_LIBS}
+  ${LOCAL_DEPS})

3rdparty/opencv-4.5.4/samples/semihosting/histogram/histogram.cpp

@@ -0,0 +1,43 @@
+// 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 <opencv2/imgproc.hpp>
+#include <opencv2/imgcodecs.hpp>
+
+#include <cstdint>
+#include <array>
+#include <iostream>
+#include "raw_pixels.hpp"
+
+#define IMG_ROWS 100
+#define IMG_COLS 100
+
+static_assert(IMG_ROWS * IMG_COLS <= RAW_PIXELS_SIZE, "Incompatible size");
+
+int main(void)
+{
+    // Number of experiment runs
+    int no_runs = 2;
+
+    // https://docs.opencv.org/master/d3/d63/classcv_1_1Mat.html
+    cv::Mat src_new(IMG_ROWS, IMG_COLS, CV_8UC1, (void *)raw_pixels);
+
+    // Set parameters
+    int imgCount = 1;
+    const int channels[] = {0};
+    cv::Mat mask = cv::Mat();
+    cv::Mat hist;
+    int dims = 1;
+    const int hist_sizes[] = {256};
+    float Range[] = {0,256};
+    const float *ranges[] = {Range};
+
+    // Run calc Hist
+    for(int i=0; i < no_runs; i++){
+        std::cout << "Running iteration # "<< i << std::endl;
+        cv::calcHist(&src_new, imgCount, channels, mask, hist, dims, hist_sizes, ranges);
+    }
+
+    return 0;
+}

3rdparty/opencv-4.5.4/samples/semihosting/include/CMakeLists.txt

@@ -0,0 +1,16 @@
+# Populate a C array with random data.
+set(RAW_PIXELS_SIZE 102400)
+set(RAW_PIXELS_HEADER ${CMAKE_CURRENT_BINARY_DIR}/raw_pixels.hpp)
+set(RAW_PIXELS_HEADER_IN ${CMAKE_CURRENT_SOURCE_DIR}/raw_pixels.hpp.in)
+
+set(RAW_PIXEL_VALUES "")
+# Seed the random number generator.
+string(RANDOM LENGTH 8 ALPHABET 0123456789abcdf RANDOM_SEED 314 number)
+math(EXPR LOOP_RANGE "${RAW_PIXELS_SIZE} - 1")
+
+foreach(i RANGE ${LOOP_RANGE})
+  string(RANDOM LENGTH 8 ALPHABET 0123456789abcdf number)
+  string(CONCAT RAW_PIXEL_VALUES ${RAW_PIXEL_VALUES} "0x${number}, \\\n")
+endforeach()
+
+configure_file(${RAW_PIXELS_HEADER_IN} ${RAW_PIXELS_HEADER})

3rdparty/opencv-4.5.4/samples/semihosting/include/raw_pixels.hpp.in

@@ -0,0 +1,11 @@
+#ifndef RAW_PIXELS_HPP
+#define RAW_PIXELS_HP
+#include <cstdint>
+
+#cmakedefine RAW_PIXEL_VALUES @RAW_PIXEL_VALUES@
+#cmakedefine RAW_PIXELS_SIZE @RAW_PIXELS_SIZE@
+
+static std::uint32_t raw_pixels[RAW_PIXELS_SIZE] = {
+    RAW_PIXEL_VALUES
+};
+#endif //RAW_PIXELS_HPP

3rdparty/opencv-4.5.4/samples/semihosting/norm/CMakeLists.txt

@@ -0,0 +1,25 @@
+# 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
+
+set(PROJECT_NAME norm)
+project(${PROJECT_NAME})
+
+ocv_install_example_src(norm *.cpp *.hpp CMakeLists.txt)
+
+set(LOCAL_DEPS
+  opencv_core
+  ${OPENCV_MODULES_PUBLIC}
+  ${OpenCV_LIB_COMPONENTS})
+ocv_check_dependencies(${LOCAL_DEPS})
+
+if(NOT OCV_DEPENDENCIES_FOUND)
+  return()
+endif()
+
+ocv_define_sample(norm norm.cpp ${SEMIHOSTING_SUFFIX})
+ocv_include_modules_recurse(${LOCAL_DEPS})
+target_include_directories(${norm} PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+target_include_directories(${norm} PRIVATE ${RAW_PIXEL_INCLUDE})
+ocv_target_link_libraries(${norm} PRIVATE ${OPENCV_LINKER_LIBS}
+  ${LOCAL_DEPS})

3rdparty/opencv-4.5.4/samples/semihosting/norm/norm.cpp

@@ -0,0 +1,33 @@
+// 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 <opencv2/core.hpp>
+#include <opencv2/imgcodecs.hpp>
+
+#include <cstdint>
+#include <array>
+#include <iostream>
+#include "raw_pixels.hpp"
+
+#define IMG_ROWS 100
+#define IMG_COLS 100
+
+static_assert(IMG_ROWS * IMG_COLS <= RAW_PIXELS_SIZE, "Incompatible size");
+
+int main(void)
+{
+    // Number of experiment runs
+    int no_runs = 2;
+
+    // https://docs.opencv.org/master/d3/d63/classcv_1_1Mat.html
+    cv::Mat src(IMG_ROWS, IMG_COLS, CV_8UC1, (void *)raw_pixels);
+
+    // Run calc Hist
+    for(int i=0; i < no_runs; i++){
+        std::cout << "Running iteration # "<< i << std::endl;
+        cv::norm(src);
+    }
+
+    return 0;
+}