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/feature_homography.py

@@ -0,0 +1,98 @@
+#!/usr/bin/env python
+
+'''
+Feature homography
+==================
+
+Example of using features2d framework for interactive video homography matching.
+ORB features and FLANN matcher are used. The actual tracking is implemented by
+PlaneTracker class in plane_tracker.py
+
+Inspired by http://www.youtube.com/watch?v=-ZNYoL8rzPY
+
+video: http://www.youtube.com/watch?v=FirtmYcC0Vc
+
+Usage
+-----
+feature_homography.py [<video source>]
+
+Keys:
+   SPACE  -  pause video
+
+Select a textured planar object to track by drawing a box with a mouse.
+'''
+
+# Python 2/3 compatibility
+from __future__ import print_function
+
+import numpy as np
+import cv2 as cv
+
+# local modules
+import video
+from video import presets
+import common
+from common import getsize, draw_keypoints
+from plane_tracker import PlaneTracker
+
+
+class App:
+    def __init__(self, src):
+        self.cap = video.create_capture(src, presets['book'])
+        self.frame = None
+        self.paused = False
+        self.tracker = PlaneTracker()
+
+        cv.namedWindow('plane')
+        self.rect_sel = common.RectSelector('plane', self.on_rect)
+
+    def on_rect(self, rect):
+        self.tracker.clear()
+        self.tracker.add_target(self.frame, rect)
+
+    def run(self):
+        while True:
+            playing = not self.paused and not self.rect_sel.dragging
+            if playing or self.frame is None:
+                ret, frame = self.cap.read()
+                if not ret:
+                    break
+                self.frame = frame.copy()
+
+            w, h = getsize(self.frame)
+            vis = np.zeros((h, w*2, 3), np.uint8)
+            vis[:h,:w] = self.frame
+            if len(self.tracker.targets) > 0:
+                target = self.tracker.targets[0]
+                vis[:,w:] = target.image
+                draw_keypoints(vis[:,w:], target.keypoints)
+                x0, y0, x1, y1 = target.rect
+                cv.rectangle(vis, (x0+w, y0), (x1+w, y1), (0, 255, 0), 2)
+
+            if playing:
+                tracked = self.tracker.track(self.frame)
+                if len(tracked) > 0:
+                    tracked = tracked[0]
+                    cv.polylines(vis, [np.int32(tracked.quad)], True, (255, 255, 255), 2)
+                    for (x0, y0), (x1, y1) in zip(np.int32(tracked.p0), np.int32(tracked.p1)):
+                        cv.line(vis, (x0+w, y0), (x1, y1), (0, 255, 0))
+            draw_keypoints(vis, self.tracker.frame_points)
+
+            self.rect_sel.draw(vis)
+            cv.imshow('plane', vis)
+            ch = cv.waitKey(1)
+            if ch == ord(' '):
+                self.paused = not self.paused
+            if ch == 27:
+                break
+
+
+if __name__ == '__main__':
+    print(__doc__)
+
+    import sys
+    try:
+        video_src = sys.argv[1]
+    except:
+        video_src = 0
+    App(video_src).run()