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/python/package/cv2/__init__.py

@@ -0,0 +1,180 @@
+'''
+OpenCV Python binary extension loader
+'''
+import os
+import importlib
+import sys
+
+__all__ = []
+
+try:
+    import numpy
+    import numpy.core.multiarray
+except ImportError:
+    print('OpenCV bindings requires "numpy" package.')
+    print('Install it via command:')
+    print('    pip install numpy')
+    raise
+
+# TODO
+# is_x64 = sys.maxsize > 2**32
+
+
+def __load_extra_py_code_for_module(base, name, enable_debug_print=False):
+    module_name = "{}.{}".format(__name__, name)
+    export_module_name = "{}.{}".format(base, name)
+    native_module = sys.modules.pop(module_name, None)
+    try:
+        py_module = importlib.import_module(module_name)
+    except ImportError as err:
+        if enable_debug_print:
+            print("Can't load Python code for module:", module_name,
+                  ". Reason:", err)
+        # Extension doesn't contain extra py code
+        return False
+
+    if not hasattr(base, name):
+        setattr(sys.modules[base], name, py_module)
+    sys.modules[export_module_name] = py_module
+    # If it is C extension module it is already loaded by cv2 package
+    if native_module:
+        setattr(py_module, "_native", native_module)
+        for k, v in filter(lambda kv: not hasattr(py_module, kv[0]),
+                           native_module.__dict__.items()):
+            if enable_debug_print: print('    symbol: {} = {}'.format(k, v))
+            setattr(py_module, k, v)
+    return True
+
+
+def __collect_extra_submodules(enable_debug_print=False):
+    def modules_filter(module):
+        return all((
+             # module is not internal
+             not module.startswith("_"),
+             # it is not a file
+             os.path.isdir(os.path.join(_extra_submodules_init_path, module))
+        ))
+    if sys.version_info[0] < 3:
+        if enable_debug_print:
+            print("Extra submodules is loaded only for Python 3")
+        return []
+
+    __INIT_FILE_PATH = os.path.abspath(__file__)
+    _extra_submodules_init_path = os.path.dirname(__INIT_FILE_PATH)
+    return filter(modules_filter, os.listdir(_extra_submodules_init_path))
+
+
+def bootstrap():
+    import sys
+
+    import copy
+    save_sys_path = copy.copy(sys.path)
+
+    if hasattr(sys, 'OpenCV_LOADER'):
+        print(sys.path)
+        raise ImportError('ERROR: recursion is detected during loading of "cv2" binary extensions. Check OpenCV installation.')
+    sys.OpenCV_LOADER = True
+
+    DEBUG = False
+    if hasattr(sys, 'OpenCV_LOADER_DEBUG'):
+        DEBUG = True
+
+    import platform
+    if DEBUG: print('OpenCV loader: os.name="{}"  platform.system()="{}"'.format(os.name, str(platform.system())))
+
+    LOADER_DIR = os.path.dirname(os.path.abspath(os.path.realpath(__file__)))
+
+    PYTHON_EXTENSIONS_PATHS = []
+    BINARIES_PATHS = []
+
+    g_vars = globals()
+    l_vars = locals()
+
+    if sys.version_info[:2] < (3, 0):
+        from . load_config_py2 import exec_file_wrapper
+    else:
+        from . load_config_py3 import exec_file_wrapper
+
+    def load_first_config(fnames, required=True):
+        for fname in fnames:
+            fpath = os.path.join(LOADER_DIR, fname)
+            if not os.path.exists(fpath):
+                if DEBUG: print('OpenCV loader: config not found, skip: {}'.format(fpath))
+                continue
+            if DEBUG: print('OpenCV loader: loading config: {}'.format(fpath))
+            exec_file_wrapper(fpath, g_vars, l_vars)
+            return True
+        if required:
+            raise ImportError('OpenCV loader: missing configuration file: {}. Check OpenCV installation.'.format(fnames))
+
+    load_first_config(['config.py'], True)
+    load_first_config([
+        'config-{}.{}.py'.format(sys.version_info[0], sys.version_info[1]),
+        'config-{}.py'.format(sys.version_info[0])
+    ], True)
+
+    if DEBUG: print('OpenCV loader: PYTHON_EXTENSIONS_PATHS={}'.format(str(l_vars['PYTHON_EXTENSIONS_PATHS'])))
+    if DEBUG: print('OpenCV loader: BINARIES_PATHS={}'.format(str(l_vars['BINARIES_PATHS'])))
+
+    applySysPathWorkaround = False
+    if hasattr(sys, 'OpenCV_REPLACE_SYS_PATH_0'):
+        applySysPathWorkaround = True
+    else:
+        try:
+            BASE_DIR = os.path.dirname(LOADER_DIR)
+            if sys.path[0] == BASE_DIR or os.path.realpath(sys.path[0]) == BASE_DIR:
+                applySysPathWorkaround = True
+        except:
+            if DEBUG: print('OpenCV loader: exception during checking workaround for sys.path[0]')
+            pass  # applySysPathWorkaround is False
+
+    for p in reversed(l_vars['PYTHON_EXTENSIONS_PATHS']):
+        sys.path.insert(1 if not applySysPathWorkaround else 0, p)
+
+    if os.name == 'nt':
+        if sys.version_info[:2] >= (3, 8):  # https://github.com/python/cpython/pull/12302
+            for p in l_vars['BINARIES_PATHS']:
+                try:
+                    os.add_dll_directory(p)
+                except Exception as e:
+                    if DEBUG: print('Failed os.add_dll_directory(): '+ str(e))
+                    pass
+        os.environ['PATH'] = ';'.join(l_vars['BINARIES_PATHS']) + ';' + os.environ.get('PATH', '')
+        if DEBUG: print('OpenCV loader: PATH={}'.format(str(os.environ['PATH'])))
+    else:
+        # amending of LD_LIBRARY_PATH works for sub-processes only
+        os.environ['LD_LIBRARY_PATH'] = ':'.join(l_vars['BINARIES_PATHS']) + ':' + os.environ.get('LD_LIBRARY_PATH', '')
+
+    if DEBUG: print("Relink everything from native cv2 module to cv2 package")
+
+    py_module = sys.modules.pop("cv2")
+
+    native_module = importlib.import_module("cv2")
+
+    sys.modules["cv2"] = py_module
+    setattr(py_module, "_native", native_module)
+
+    for item_name, item in filter(lambda kv: kv[0] not in ("__file__", "__loader__", "__spec__",
+                                                           "__name__", "__package__"),
+                                  native_module.__dict__.items()):
+        if item_name not in g_vars:
+            g_vars[item_name] = item
+
+    sys.path = save_sys_path  # multiprocessing should start from bootstrap code (https://github.com/opencv/opencv/issues/18502)
+
+    try:
+        del sys.OpenCV_LOADER
+    except Exception as e:
+        if DEBUG:
+            print("Exception during delete OpenCV_LOADER:", e)
+
+    if DEBUG: print('OpenCV loader: binary extension... OK')
+
+    for submodule in __collect_extra_submodules(DEBUG):
+        if __load_extra_py_code_for_module("cv2", submodule, DEBUG):
+            if DEBUG: print("Extra Python code for", submodule, "is loaded")
+
+    if DEBUG: print('OpenCV loader: DONE')
+
+
+bootstrap()

3rdparty/opencv-4.5.4/modules/python/package/cv2/load_config_py2.py

@@ -0,0 +1,6 @@
+# flake8: noqa
+import sys
+
+if sys.version_info[:2] < (3, 0):
+    def exec_file_wrapper(fpath, g_vars, l_vars):
+        execfile(fpath, g_vars, l_vars)

3rdparty/opencv-4.5.4/modules/python/package/cv2/load_config_py3.py

@@ -0,0 +1,9 @@
+# flake8: noqa
+import os
+import sys
+
+if sys.version_info[:2] >= (3, 0):
+    def exec_file_wrapper(fpath, g_vars, l_vars):
+        with open(fpath) as f:
+            code = compile(f.read(), os.path.basename(fpath), 'exec')
+            exec(code, g_vars, l_vars)

3rdparty/opencv-4.5.4/modules/python/package/extra_modules/misc/__init__.py

@@ -0,0 +1 @@
+from .version import get_ocv_version

3rdparty/opencv-4.5.4/modules/python/package/extra_modules/misc/version.py

@@ -0,0 +1,5 @@
+import cv2
+
+
+def get_ocv_version():
+    return getattr(cv2, "__version__", "unavailable")

3rdparty/opencv-4.5.4/modules/python/package/setup.py

@@ -0,0 +1,59 @@
+import os
+import sys
+import platform
+import setuptools
+
+SCRIPT_DIR=os.path.dirname(os.path.abspath(__file__))
+
+def main():
+    os.chdir(SCRIPT_DIR)
+
+    package_name = 'opencv'
+    package_version = os.environ.get('OPENCV_VERSION', '4.5.4')  # TODO
+
+    long_description = 'Open Source Computer Vision Library Python bindings'  # TODO
+
+    setuptools.setup(
+        name=package_name,
+        version=package_version,
+        url='https://github.com/opencv/opencv',
+        license='Apache 2.0',
+        description='OpenCV python bindings',
+        long_description=long_description,
+        long_description_content_type="text/markdown",
+        packages=setuptools.find_packages(),
+        maintainer="OpenCV Team",
+        install_requires="numpy",
+        classifiers=[
+          'Development Status :: 5 - Production/Stable',
+          'Environment :: Console',
+          'Intended Audience :: Developers',
+          'Intended Audience :: Education',
+          'Intended Audience :: Information Technology',
+          'Intended Audience :: Science/Research',
+          'License :: Apache 2.0 License',
+          'Operating System :: MacOS',
+          'Operating System :: Microsoft :: Windows',
+          'Operating System :: POSIX',
+          'Operating System :: Unix',
+          'Programming Language :: Python',
+          'Programming Language :: Python :: 2',
+          'Programming Language :: Python :: 2.7',
+          'Programming Language :: Python :: 3',
+          'Programming Language :: Python :: 3.4',
+          'Programming Language :: Python :: 3.5',
+          'Programming Language :: Python :: 3.6',
+          'Programming Language :: Python :: 3.7',
+          'Programming Language :: Python :: 3.8',
+          'Programming Language :: Python :: 3.9',
+          'Programming Language :: C++',
+          'Programming Language :: Python :: Implementation :: CPython',
+          'Topic :: Scientific/Engineering',
+          'Topic :: Scientific/Engineering :: Image Recognition',
+          'Topic :: Software Development',
+          'Topic :: Software Development :: Libraries',
+        ],
+    )
+
+if __name__ == '__main__':
+    main()

3rdparty/opencv-4.5.4/modules/python/package/template/config-x.y.py.in

@@ -0,0 +1,3 @@
+PYTHON_EXTENSIONS_PATHS = [
+    @CMAKE_PYTHON_EXTENSION_PATH@
+] + PYTHON_EXTENSIONS_PATHS

3rdparty/opencv-4.5.4/modules/python/package/template/config.py.in

@@ -0,0 +1,5 @@
+import os
+
+BINARIES_PATHS = [
+    @CMAKE_PYTHON_BINARIES_PATH@
+] + BINARIES_PATHS