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Accepted
bluesky
Asked:2023-09-16 07:15:48 +0800 CST2023-09-16 07:15:48 +0800 CST

PyQt5 中的相机拍摄

  • 772

启动程序时需要保存来自网络摄像头的两张图片，但仅保存第一张图片。

import sys        
from PyQt5.Qt import *


class MyWidget(QWidget):
    def __init__(self, parent):            
        super(QWidget, self).__init__(parent)
        self.layout = QVBoxLayout(self)            
        self.viewfinder = QCameraViewfinder()
        self.cameraInfo = QCameraInfo.defaultCamera()            
        self.camera = QCamera(self.cameraInfo)
        self.camera.setViewfinder(self.viewfinder)
        self.camera.setCaptureMode(QCamera.CaptureStillImage)
        self.layout.insertWidget(1, self.viewfinder)
        if self.camera.status() != QCamera.UnavailableStatus:
            self.camera.start() 
            self.capture = QCameraImageCapture(self.camera)
        # Сохранение снимков
        for i in range(2):                                
            self.capture.capture('C:/pyqt_' + str(i) + '.jpg')


class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.widget1 = MyWidget(self)
        self.central_widget = QWidget()
        self.setCentralWidget(self.central_widget)
        main_layout = QVBoxLayout(self.central_widget)
        main_layout.addWidget(self.widget1)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    app.setApplicationName("pyqt5")
    window = MainWindow()
    window.show()
    sys.exit(app.exec())
python

1 个回答

  1. Best Answer

    ReadyForCapture : const bool

    此属性确定服务是否准备好立即捕获图像。不允许在 value 时
    调用并导致错误。capture()ReadyForCapturefalse

    将打印插入循环中，您将看到一切：

        for i in range(2):                                
        print(f'{self.capture.isReadyForCapture()}')        # <----
        self.capture.capture(f'D:/_Qt/__Qt/pyqt_{i}.jpg')

    您需要更改逻辑，例如这样：

    import sys
from PyQt5.Qt import * 


class MyWidget(QWidget):
    def __init__(self, parent):            
        super(QWidget, self).__init__(parent)
        
        self.viewfinder = QCameraViewfinder()
        self.cameraInfo = QCameraInfo.defaultCamera()            
        self.camera = QCamera(self.cameraInfo)
        self.camera.setViewfinder(self.viewfinder)
        self.camera.setCaptureMode(QCamera.CaptureStillImage)
        
        self.i = 0                                                        # +++
        self.capture = QCameraImageCapture(self.camera)
        self.capture.readyForCaptureChanged.connect(self.captureChanged)  # +++
        
        self.layout = QVBoxLayout(self)        
        self.layout.insertWidget(1, self.viewfinder)
        if self.camera.status() != QCamera.UnavailableStatus:
            self.camera.start() 
#            self.capture = QCameraImageCapture(self.camera)

    def captureChanged(self, ready):                                        # +++
        if ready and self.i < 5:            # для теста, хотим сделать 5(пять) снимков 
            print(f'  captureChanged: {ready}') #
            self.capture.capture(f'D:/_Qt/__Qt/pyqt_{self.i}.jpg')
            self.i += 1
        
            
class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.central_widget = QWidget()
        self.setCentralWidget(self.central_widget)
        
        self.widget1 = MyWidget(self)
        
        main_layout = QVBoxLayout(self.central_widget)
        main_layout.addWidget(self.widget1)
        
        
if __name__ == '__main__':
    app = QApplication(sys.argv)
    app.setApplicationName("PyQt5 QCameraImageCapture")
    window = MainWindow()
    window.show()
    sys.exit(app.exec())
    • 2

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