在pyqt5中恢復使用opencv創建的執行緒

我正在嘗試設計一個與我的計算機視覺專案相關的 gui。在那，我想停止網路攝像頭的視頻，我想通過按一個按鈕來恢復它。我設法停止了提要，但我無法恢復它。相機已打開，但無法正常作業。這是程式的代碼。

from PyQt5 import uic
from PyQt5 import QtCore, QtWidgets, QtGui
import cv2
import sys

class opencv_feed(QtWidgets.QMainWindow):
    def __init__(self):
        QtWidgets.QMainWindow.__init__(self)
        self.ui = uic.loadUi('../designs/design5_flexible_opencv_window2.ui', self)    #change this whenever u want... keep the ui file with you
        self.resize(900,600)

        self.worker1 = worker1()                                #creating an instance
        self.worker1.start()
        self.worker1.ImgUpdate.connect(self.ImageUpdateSlot)
        self.but_stop.clicked.connect(self.cancel_feed)
        self.but_resume.clicked.connect(self.resume_feed)
        
   
    def ImageUpdateSlot(self, Image):
        self.label.setPixmap(QtGui.QPixmap.fromImage(Image))
        
    def cancel_feed(self):
        self.worker1.stop()
    
    def resume_feed(self):
        self.__init__()
        #self.worker1.ImgUpdate.connect(self.ImageUpdateSlot)

class worker1(QtCore.QThread):
    ImgUpdate = QtCore.pyqtSignal(QtGui.QImage)
    
    @QtCore.pyqtSlot()
    def run(self):  #put self in every variable to stop crashing the gui, when we interact with gui
        self.ThreadActive = True
        self.feed = cv2.VideoCapture(0)
        while self.ThreadActive:
            self.ret, self.frm = self.feed.read()
            if self.ret:
                self.img = cv2.cvtColor(self.frm, cv2.COLOR_BGR2RGB)
                #print(img1.shape)
                self.img = cv2.flip(self.img,1)
                self.qtformat_conv_img = QtGui.QImage(self.img.data, self.img.shape[1], self.img.shape[0], QtGui.QImage.Format_RGB888)
                #print(self.img.shape)
                self.pic = self.qtformat_conv_img.scaled(self.img.shape[1],self.img.shape[0],QtCore.Qt.KeepAspectRatio)    #keep this as an attribute, else when resizing the app stops                                              
                self.ImgUpdate.emit(self.pic)
    def stop(self):
        self.ThreadActive = False
        self.feed.release()
        self.quit()
        #os._exit(0)  
        
if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    wind = opencv_feed()
    wind.show()
    sys.exit(app.exec_())

有人可以解釋一下我做錯了什么。

鏈接到 UI 檔案.. https://drive.google.com/file/d/1UP8RjQML1GzFA75eGURgWt4Y0o_Ip3sU/view?usp=sharing

uj5u.com熱心網友回復：

您只能啟動一個執行緒一次。完成后，您需要創建另一個執行緒物件以實際運行。我會在 self.ThreadActive 之后添加另一個標志，稱為“暫停”以保持執行緒處于活動狀態，而無需執行任何操作。

@QtCore.pyqtSlot()
def run(self):  #put self in every variable to stop crashing the gui, when we interact with gui
    self.ThreadActive = True
    self.paused = False
    self.feed = cv2.VideoCapture(0)
    while self.ThreadActive:
        if not self.paused:
            self.ret, self.frm = self.feed.read()
            if self.ret:
                self.img = cv2.cvtColor(self.frm, cv2.COLOR_BGR2RGB)
                #print(img1.shape)
                self.img = cv2.flip(self.img,1)
                self.qtformat_conv_img = QtGui.QImage(self.img.data, 
                                                      self.img.shape[1], 
                                                      self.img.shape[0], 
                                                      QtGui.QImage.Format_RGB888)
                #print(self.img.shape)
                self.pic = self.qtformat_conv_img.scaled(self.img.shape[1],self.img.shape[0],QtCore.Qt.KeepAspectRatio)    #keep this as an attribute, else when resizing the app stops                                              
                self.ImgUpdate.emit(self.pic)

這樣，當您想暫停執行緒時，您可以使用該標志暫停和取消暫停

要么，要么您需要始終創建作業人員的另一個實體。如果您在init之外創建實體，它是否有效？如果init被呼叫兩次，我不確定 GUI 會發生什么。

編輯：您還必須更改暫停并重新開始的方式

def cancel_feed(self):
    self.worker1.paused = True

def resume_feed(self):
    self.worker1.paused = False

標籤：Python 多线程 opencv pyqt5

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