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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
#!/usr/bin/env python
'''
This program detects the QR-codes using OpenCV Library.
Usage:
qrcode.py
'''
# Python 2/3 compatibility
from __future__ import print_function
import numpy as np
import cv2 as cv
import argparse
import sys
PY3 = sys.version_info[0] == 3
if PY3:
xrange = range
class QrSample:
def __init__(self, args):
self.fname = ''
self.fext = ''
self.fsaveid = 0
self.input = args.input
self.detect = args.detect
self.out = args.out
self.multi = args.multi
self.saveDetections = args.save_detections
self.saveAll = args.save_all
self.arucoBased = args.aruco_based
def getQRModeString(self):
msg1 = "multi " if self.multi else ""
msg2 = "detector" if self.detect else "decoder"
msg = "QR {:s}{:s}".format(msg1, msg2)
return msg
def drawFPS(self, result, fps):
message = '{:.2f} FPS({:s})'.format(fps, self.getQRModeString())
cv.putText(result, message, (20, 20), 1,
cv.FONT_HERSHEY_DUPLEX, (0, 0, 255))
def drawQRCodeContours(self, image, cnt):
if cnt.size != 0:
rows, cols, _ = image.shape
show_radius = 2.813 * ((rows / cols) if rows > cols else (cols / rows))
contour_radius = show_radius * 0.4
cv.drawContours(image, [cnt], 0, (0, 255, 0), int(round(contour_radius)))
tpl = cnt.reshape((-1, 2))
for x in tuple(tpl.tolist()):
color = (255, 0, 0)
cv.circle(image, tuple(x), int(round(contour_radius)), color, -1)
def drawQRCodeResults(self, result, points, decode_info, fps):
n = len(points)
if isinstance(decode_info, str):
decode_info = [decode_info]
if n > 0:
for i in range(n):
cnt = np.array(points[i]).reshape((-1, 1, 2)).astype(np.int32)
self.drawQRCodeContours(result, cnt)
msg = 'QR[{:d}]@{} : '.format(i, *(cnt.reshape(1, -1).tolist()))
print(msg, end="")
if len(decode_info) > i:
if decode_info[i]:
print("'", decode_info[i], "'")
else:
print("Can't decode QR code")
else:
print("Decode information is not available (disabled)")
else:
print("QRCode not detected!")
self.drawFPS(result, fps)
def runQR(self, qrCode, inputimg):
if not self.multi:
if not self.detect:
decode_info, points, _ = qrCode.detectAndDecode(inputimg)
dec_info = decode_info
else:
_, points = qrCode.detect(inputimg)
dec_info = []
else:
if not self.detect:
_, decode_info, points, _ = qrCode.detectAndDecodeMulti(
inputimg)
dec_info = decode_info
else:
_, points = qrCode.detectMulti(inputimg)
dec_info = []
if points is None:
points = []
return points, dec_info
def DetectQRFrmImage(self, inputfile):
inputimg = cv.imread(inputfile, cv.IMREAD_COLOR)
if inputimg is None:
print('ERROR: Can not read image: {}'.format(inputfile))
return
print('Run {:s} on image [{:d}x{:d}]'.format(
self.getQRModeString(), inputimg.shape[1], inputimg.shape[0]))
if self.arucoBased:
qrCode = cv.QRCodeDetectorAruco()
else:
qrCode = cv.QRCodeDetector()
count = 10
timer = cv.TickMeter()
for _ in range(count):
timer.start()
points, decode_info = self.runQR(qrCode, inputimg)
timer.stop()
fps = count / timer.getTimeSec()
print('FPS: {}'.format(fps))
result = inputimg
self.drawQRCodeResults(result, points, decode_info, fps)
cv.imshow("QR", result)
cv.waitKey(1)
if self.out != '':
outfile = self.fname + self.fext
print("Saving Result: {}".format(outfile))
cv.imwrite(outfile, result)
print("Press any key to exit ...")
cv.waitKey(0)
print("Exit")
def processQRCodeDetection(self, qrcode, frame):
if len(frame.shape) == 2:
result = cv.cvtColor(frame, cv.COLOR_GRAY2BGR)
else:
result = frame
print('Run {:s} on video frame [{:d}x{:d}]'.format(
self.getQRModeString(), frame.shape[1], frame.shape[0]))
timer = cv.TickMeter()
timer.start()
points, decode_info = self.runQR(qrcode, frame)
timer.stop()
fps = 1 / timer.getTimeSec()
self.drawQRCodeResults(result, points, decode_info, fps)
return fps, result, points
def DetectQRFrmCamera(self):
cap = cv.VideoCapture(0)
if not cap.isOpened():
print("Cannot open the camera")
return
print("Press 'm' to switch between detectAndDecode and detectAndDecodeMulti")
print("Press 'd' to switch between decoder and detector")
print("Press ' ' (space) to save result into images")
print("Press 'ESC' to exit")
if self.arucoBased:
qrcode = cv.QRCodeDetectorAruco()
else:
qrcode = cv.QRCodeDetector()
while True:
ret, frame = cap.read()
if not ret:
print("End of video stream")
break
forcesave = self.saveAll
result = frame
try:
fps, result, corners = self.processQRCodeDetection(qrcode, frame)
print('FPS: {:.2f}'.format(fps))
forcesave |= self.saveDetections and (len(corners) != 0)
except cv.error as e:
print("Error exception: ", e)
forcesave = True
cv.imshow("QR code", result)
code = cv.waitKey(1)
if code < 0 and (not forcesave):
continue
if code == ord(' ') or forcesave:
fsuffix = '-{:05d}'.format(self.fsaveid)
self.fsaveid += 1
fname_in = self.fname + fsuffix + "_input.png"
print("Saving QR code detection result: '{}' ...".format(fname_in))
cv.imwrite(fname_in, frame)
print("Saved")
if code == ord('m'):
self.multi = not self.multi
msg = 'Switching QR code mode ==> {:s}'.format(
"detectAndDecodeMulti" if self.multi else "detectAndDecode")
print(msg)
if code == ord('d'):
self.detect = not self.detect
msg = 'Switching QR code mode ==> {:s}'.format(
"detect" if self.detect else "decode")
print(msg)
if code == 27:
print("'ESC' is pressed. Exiting...")
break
print("Exit.")
def main():
parser = argparse.ArgumentParser(
description='This program detects the QR-codes input images using OpenCV Library.')
parser.add_argument(
'-i',
'--input',
help="input image path (for example, 'opencv_extra/testdata/cv/qrcode/multiple/*_qrcodes.png)",
default="",
metavar="")
parser.add_argument(
'--aruco_based',
help="use aruco-based detector",
action='store_true')
parser.add_argument(
'-d',
'--detect',
help="detect QR code only (skip decoding) (default: False)",
action='store_true')
parser.add_argument(
'-m',
'--multi',
help="enable multiple qr-codes detection",
action='store_true')
parser.add_argument(
'-o',
'--out',
help="path to result file (default: qr_code.png)",
default="qr_code.png",
metavar="")
parser.add_argument(
'--save_detections',
help="save all QR detections (video mode only)",
action='store_true')
parser.add_argument(
'--save_all',
help="save all processed frames (video mode only)",
action='store_true')
args = parser.parse_args()
qrinst = QrSample(args)
if args.out != '':
index = args.out.rfind('.')
if index != -1:
qrinst.fname = args.out[:index]
qrinst.fext = args.out[index:]
else:
qrinst.fname = args.out
qrinst.fext = ".png"
if args.input != '':
qrinst.DetectQRFrmImage(args.input)
else:
qrinst.DetectQRFrmCamera()
if __name__ == '__main__':
print(__doc__)
main()
cv.destroyAllWindows()
|
