我的头撞在墙上,试图弄清楚如何调整和重新排列我在Raspberry Pi上构建的摄像头应用程序。我希望能够通过点击视频来调整窗口大小,从一个全屏应用程序到一个较小的版本,该版本将显示在我的触摸屏的角落
https://github.com/eighty2fifty1/multicam
我正在使用OpenCV运行相机本身。虽然该应用程序的重点是运行4个摄像头并在它们之间切换,但所有这些都是在外部硬件中实现的,所以只需将其视为显示一个USB网络摄像头即可。我还没有完全准备好使用OpenCV来实现这一点,但到目前为止它已经成功了
当我试图调整窗口大小、最小化或最大化窗口时,我的RPI4似乎也会出现分段错误。不确定这是否有关系,但我用两个全新的SD卡试过,希望排除硬件问题
我所尝试的:
按程序重新排列窗口。不会显示视频,也会给我一个分段错误
将MyWindowClass子类化为BigWindowClass和SmallWindowClass,然后将单独的.ui文件发送到各自的类,然后使用.show()和.hide()方法确定要显示哪一个。这将在大窗口中显示视频,但不是小窗口
为了清晰起见,我省略了一些函数,但是完整的源代码在上面的github链接中
class Thread(QThread):
global file, big, small
changePixmap = pyqtSignal(QImage)
def run(self):
cap = cv2.VideoCapture(0)
while running:
ret, frame = cap.read()
if ret:
# not sure if the queue was necessary to prevent memory or processor problems
if q.qsize() < 10:
q.put(frame)
else:
print(q.qsize())
if not q.empty():
f = q.get()
rgbImage = cv2.cvtColor(f, cv2.COLOR_BGR2RGB)
h, w, ch = rgbImage.shape
bytesPerLine = ch * w
convertToQtFormat = QImage(rgbImage.data, w, h, bytesPerLine, QImage.Format_RGB888)
if file == big:
p = convertToQtFormat.scaled(640, 480, Qt.KeepAspectRatio)
elif file == small:
p = convertToQtFormat.scaled(200, 150, Qt.KeepAspectRatio)
else:
pass
self.changePixmap.emit(p)
if self.isFinished():
print("thread killed")
class MyWindowClass(QMainWindow, form_class):
def __init__(self, parent=None):
QMainWindow.__init__(self, parent)
self.setupUi(self)
self.sel = Selector()
self.press = 0
self.rel = 0
self.videoLbl = ClickableLabel(self.videoLbl)
self.setWindowTitle('Camera')
self.connectSignals()
self.th = Thread(self)
self.th.changePixmap.connect(self.setImage)
self.th.start()
self.show()
@pyqtSlot(QImage)
def setImage(self, image):
pixmap = QPixmap.fromImage(image)
self.videoLbl.setPixmap(pixmap)
# this will eventually be the function to change views
def _resize(self):
print("resize clicked")
# signal connections
def connectSignals(self):
self.cam1.clicked.connect(lambda: self.sel.selectCamera(1))
self.cam2.clicked.connect(lambda: self.sel.selectCamera(2))
self.cam3.clicked.connect(lambda: self.sel.selectCamera(3))
self.cam4.clicked.connect(lambda: self.sel.selectCamera(4))
self.buttonGroup.setId(self.cam1, 1)
self.buttonGroup.setId(self.cam2, 2)
self.buttonGroup.setId(self.cam3, 3)
self.buttonGroup.setId(self.cam4, 4)
'''
self.resizeButton.clicked.connect(resizeWindow)
self.posCheck.clicked.connect(posit)
'''
self.pairButton.pressed.connect(self.prPress)
self.pairButton.released.connect(self.prRel)
self.sel.camSelected.connect(self.selected)
self.videoLbl.clicked.connect(self._resize)
app = QtWidgets.QApplication(sys.argv)
window = MyWindowClass(None)
window.show()
running = True
app.exec_()
所以我自己找到了解决办法。这可能不是最优雅或最有效的,但它正在发挥作用。我从Qt crashes when picture from OpenCV is too large得到一个大线索,我需要先复制我的QImage
我再次尝试对我的主窗口进行子类化,并使用两个单独的.ui文件,在进行了一些调整后,程序按预期工作
https://github.com/eighty2fifty1/multicam/blob/master/multicam4.py
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