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/python/tutorial_code/imgProc/Smoothing/smoothing.py

@@ -0,0 +1,107 @@
+import sys
+import cv2 as cv
+import numpy as np
+
+#  Global Variables
+
+DELAY_CAPTION = 1500
+DELAY_BLUR = 100
+MAX_KERNEL_LENGTH = 31
+
+src = None
+dst = None
+window_name = 'Smoothing Demo'
+
+
+def main(argv):
+    cv.namedWindow(window_name, cv.WINDOW_AUTOSIZE)
+
+    # Load the source image
+    imageName = argv[0] if len(argv) > 0 else 'lena.jpg'
+
+    global src
+    src = cv.imread(cv.samples.findFile(imageName))
+    if src is None:
+        print ('Error opening image')
+        print ('Usage: smoothing.py [image_name -- default ../data/lena.jpg] \n')
+        return -1
+
+    if display_caption('Original Image') != 0:
+        return 0
+
+    global dst
+    dst = np.copy(src)
+    if display_dst(DELAY_CAPTION) != 0:
+        return 0
+
+    # Applying Homogeneous blur
+    if display_caption('Homogeneous Blur') != 0:
+        return 0
+
+    ## [blur]
+    for i in range(1, MAX_KERNEL_LENGTH, 2):
+        dst = cv.blur(src, (i, i))
+        if display_dst(DELAY_BLUR) != 0:
+            return 0
+    ## [blur]
+
+    # Applying Gaussian blur
+    if display_caption('Gaussian Blur') != 0:
+        return 0
+
+    ## [gaussianblur]
+    for i in range(1, MAX_KERNEL_LENGTH, 2):
+        dst = cv.GaussianBlur(src, (i, i), 0)
+        if display_dst(DELAY_BLUR) != 0:
+            return 0
+    ## [gaussianblur]
+
+    # Applying Median blur
+    if display_caption('Median Blur') != 0:
+        return 0
+
+    ## [medianblur]
+    for i in range(1, MAX_KERNEL_LENGTH, 2):
+        dst = cv.medianBlur(src, i)
+        if display_dst(DELAY_BLUR) != 0:
+            return 0
+    ## [medianblur]
+
+    # Applying Bilateral Filter
+    if display_caption('Bilateral Blur') != 0:
+        return 0
+
+    ## [bilateralfilter]
+    # Remember, bilateral is a bit slow, so as value go higher, it takes long time
+    for i in range(1, MAX_KERNEL_LENGTH, 2):
+        dst = cv.bilateralFilter(src, i, i * 2, i / 2)
+        if display_dst(DELAY_BLUR) != 0:
+            return 0
+    ## [bilateralfilter]
+
+    #  Done
+    display_caption('Done!')
+
+    return 0
+
+
+def display_caption(caption):
+    global dst
+    dst = np.zeros(src.shape, src.dtype)
+    rows, cols, _ch = src.shape
+    cv.putText(dst, caption,
+                (int(cols / 4), int(rows / 2)),
+                cv.FONT_HERSHEY_COMPLEX, 1, (255, 255, 255))
+
+    return display_dst(DELAY_CAPTION)
+
+
+def display_dst(delay):
+    cv.imshow(window_name, dst)
+    c = cv.waitKey(delay)
+    if c >= 0 : return -1
+    return 0
+
+
+if __name__ == "__main__":
+    main(sys.argv[1:])