我尝试使用PyQt和openalpr构建GUI应用程序,但我的代码有问题。以下是一个简单的示例:
from openalpr import Alpr
from PyQt4 import QtCore, QtGui
class AnalizePlate(object):
def __init__(self):
self.alpr = None
try:
self.alpr = Alpr("eu", "/etc/openalpr/openalpr.conf", "/usr/share/openalpr/runtime_data")
if not self.alpr.is_loaded():
print("Error loading OpenALPR")
except:
print "Error"
def proccess(self):
self.alpr.set_top_n(7)
self.alpr.set_default_region("md")
results = self.alpr.recognize_file("/tmp/1487428945.14.jpg")
print results
a = AnalizePlate()
a.proccess()
上面的代码运行良好,但如果涉及GUI,则会出现奇怪的行为。from openalpr import Alpr
from PyQt4 import QtCore, QtGui
class AnalizePlate(object):
def __init__(self):
self.alpr = None
try:
self.alpr = Alpr("eu", "/etc/openalpr/openalpr.conf", "/usr/share/openalpr/runtime_data")
if not self.alpr.is_loaded():
print("Error loading OpenALPR")
except:
print "Error"
def proccess(self):
self.alpr.set_top_n(7)
self.alpr.set_default_region("md")
results = self.alpr.recognize_file("/tmp/1487428945.14.jpg")
print results
class Window(QtGui.QWidget):
def __init__(self):
super(Window, self).__init__()
self.resize(1198, 651)
self.analize = AnalizePlate()
self.analize.proccess()
QtCore.QMetaObject.connectSlotsByName(self)
if __name__ == "__main__":
import sys
import sip
app = QtGui.QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec_())
这是一个基本的例子,但错误依然存在。我试图将openalpr
代码直接实现到Window
类中,但没有成功。所以基本上,如果没有GUI界面,代码可以工作。使用openALPR版本2.2.4
和PyQT4
。同时,检查了图片,它确实存在。当使用recognize_array()
而不是recognize file
时也是一样的。我得到的错误是:
OpenCV错误:在detectMultiScale函数(文件/build/opencv-SviWsf/opencv-2.4.9.1+dfsg/modules/objdetect/src/cascadedetect.cpp,第1081行)中,断言失败(scaleFactor > 1 && image.depth() == CV_8U)。在OpenALPR识别中捕获异常:/build/opencv-SviWsf/opencv-2.4.9.1+dfsg/modules/objdetect/src/cascadedetect.cpp:1081:error:(-215) scaleFactor > 1 && image.depth() == CV_8U in function detectMultiScale
Traceback (most recent call last): File "analize.py", line 39, in window = Window() File "analize.py", line 31, in __init__ self.analize.proccess() File "analize.py", line 22, in proccess results = self.alpr.recognize_file("/tmp/1487428945.14.jpg") File "/usr/lib/python2.7/dist-packages/openalpr/openalpr.py", line 132, in recognize_file response_obj = json.loads(json_data) File "/usr/lib/python2.7/json/__init__.py", line 339, in loads return _default_decoder.decode(s) File "/usr/lib/python2.7/json/decoder.py", line 364, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) File "/usr/lib/python2.7/json/decoder.py", line 380, in raw_decode obj, end = self.scan_once(s, idx) ValueError: Expecting property name: line 1 column 122 (char 121)
apt-get
安装的,并且它带有opencv支持(版本为2.4.9.1)。因此,从源代码安装解决了我的问题,而无需进行任何代码修改。但问题是,为什么opencv 2.4.9和pyqt会发生冲突? - Aleksandar