本文主要分享的是一則python+opencv實現(xiàn)任意角度的透視變換的實例，具體如下：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
# -*- coding:utf-8 -*-import cv2import numpy as npdef rad(x): return x * np.pi / 180img = cv2.imread("6.jfif")cv2.imshow("original", img)# 擴展圖像，保證內(nèi)容不超出可視范圍img = cv2.copyMakeBorder(img, 200, 200, 200, 200, cv2.BORDER_CONSTANT, 0)w, h = img.shape[0:2]anglex = 0angley = 30anglez = 0 #是旋轉(zhuǎn)fov = 42while 1: # 鏡頭與圖像間的距離，21為半可視角，算z的距離是為了保證在此可視角度下恰好顯示整幅圖像 z = np.sqrt(w ** 2 + h ** 2) / 2 / np.tan(rad(fov / 2)) # 齊次變換矩陣 rx = np.array([[1, 0, 0, 0], [0, np.cos(rad(anglex)), -np.sin(rad(anglex)), 0], [0, -np.sin(rad(anglex)), np.cos(rad(anglex)), 0, ], [0, 0, 0, 1]], np.float32) ry = np.array([[np.cos(rad(angley)), 0, np.sin(rad(angley)), 0], [0, 1, 0, 0], [-np.sin(rad(angley)), 0, np.cos(rad(angley)), 0, ], [0, 0, 0, 1]], np.float32) rz = np.array([[np.cos(rad(anglez)), np.sin(rad(anglez)), 0, 0], [-np.sin(rad(anglez)), np.cos(rad(anglez)), 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]], np.float32) r = rx.dot(ry).dot(rz) # 四對點的生成 pcenter = np.array([h / 2, w / 2, 0, 0], np.float32) p1 = np.array([0, 0, 0, 0], np.float32) - pcenter p2 = np.array([w, 0, 0, 0], np.float32) - pcenter p3 = np.array([0, h, 0, 0], np.float32) - pcenter p4 = np.array([w, h, 0, 0], np.float32) - pcenter dst1 = r.dot(p1) dst2 = r.dot(p2) dst3 = r.dot(p3) dst4 = r.dot(p4) list_dst = [dst1, dst2, dst3, dst4] org = np.array([[0, 0], [w, 0], [0, h], [w, h]], np.float32) dst = np.zeros((4, 2), np.float32) # 投影至成像平面 for i in range(4): dst[i, 0] = list_dst[i][0] * z / (z - list_dst[i][2]) + pcenter[0] dst[i, 1] = list_dst[i][1] * z / (z - list_dst[i][2]) + pcenter[1] warpR = cv2.getPerspectiveTransform(org, dst) result = cv2.warpPerspective(img, warpR, (h, w)) cv2.imshow("result", result) c = cv2.waitKey(30) # anglex += 3 #auto rotate # anglez += 1 #auto rotate # angley += 2 #auto rotate # 鍵盤控制 if 27 == c: # Esc quit break; if c == ord('w'): anglex += 1 if c == ord('s'): anglex -= 1 if c == ord('a'): angley += 1 # dx=0 if c == ord('d'): angley -= 1 if c == ord('u'): anglez += 1 if c == ord('p'): anglez -= 1 if c == ord('t'): fov += 1 if c == ord('r'): fov -= 1 if c == ord(' '): anglex = angley = anglez = 0 if c == ord('q'): print("======================================") print('旋轉(zhuǎn)矩陣：\n', r) print("angle alpha: ", anglex, 'angle beta: ', angley, "dz: ", anglez, ": ", z)cv2.destroyAllWindows() |
總結(jié)
以上就是本文關(guān)于python opencv實現(xiàn)任意角度的透視變換實例代碼的全部內(nèi)容，希望對大家有所幫助。感興趣的朋友可以繼續(xù)參閱本站其他相關(guān)專題，如有不足之處，歡迎留言指出。感謝朋友們對本站的支持！
原文鏈接：http://blog.csdn.net/jacke121/article/details/78996288
