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Displaying webcam feed using OpenCV and Python+PySide.
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#!/usr/bin/env python | |
from PySide.QtCore import * | |
from PySide.QtGui import * | |
import cv2 | |
import sys | |
class MainApp(QWidget): | |
def __init__(self): | |
QWidget.__init__(self) | |
self.video_size = QSize(320, 240) | |
self.setup_ui() | |
self.setup_camera() | |
def setup_ui(self): | |
"""Initialize widgets. | |
""" | |
self.image_label = QLabel() | |
self.image_label.setFixedSize(self.video_size) | |
self.quit_button = QPushButton("Quit") | |
self.quit_button.clicked.connect(self.close) | |
self.main_layout = QVBoxLayout() | |
self.main_layout.addWidget(self.image_label) | |
self.main_layout.addWidget(self.quit_button) | |
self.setLayout(self.main_layout) | |
def setup_camera(self): | |
"""Initialize camera. | |
""" | |
self.capture = cv2.VideoCapture(0) | |
self.capture.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, self.video_size.width()) | |
self.capture.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, self.video_size.height()) | |
self.timer = QTimer() | |
self.timer.timeout.connect(self.display_video_stream) | |
self.timer.start(30) | |
def display_video_stream(self): | |
"""Read frame from camera and repaint QLabel widget. | |
""" | |
_, frame = self.capture.read() | |
frame = cv2.cvtColor(frame, cv2.cv.CV_BGR2RGB) | |
frame = cv2.flip(frame, 1) | |
image = QImage(frame, frame.shape[1], frame.shape[0], | |
frame.strides[0], QImage.Format_RGB888) | |
self.image_label.setPixmap(QPixmap.fromImage(image)) | |
if __name__ == "__main__": | |
app = QApplication(sys.argv) | |
win = MainApp() | |
win.show() | |
sys.exit(app.exec_()) |
import qimage2ndarray
def display_video_stream(self):
"""Read frame from camera and repaint QLabel widget.
"""
_, frame = self.capture.read()
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
frame = cv2.flip(frame, 1)
image = qimage2ndarray.array2qimage(frame) #SOLUTION FOR MEMORY LEAK
self.image_label.setPixmap(QPixmap.fromImage(image))
thanks for the solution ragu25
Thanks for the example!
I don't see a memory leak using PySide6.
For PySide6:
from PySide6.QtCore import *
from PySide6.QtGui import *
from PySide6.QtWidgets import *
import cv2
import sys
...
requirements.txt (install via pip install -r "requirements.txt"
):
pyside6==6.1.2
opencv-python==4.5.2.52
It needed some editing to work with
pyside2 5.15.2
opencv-python 4.3.0.36
Here is updated version:
#!/usr/bin/env python
from PySide2.QtCore import *
from PySide2.QtGui import *
from PySide2.QtWidgets import *
import qimage2ndarray
import cv2
import sys
class MainApp(QWidget):
def __init__(self):
QWidget.__init__(self)
self.video_size = QSize(320, 240)
self.setup_ui()
self.setup_camera()
def setup_ui(self):
"""Initialize widgets.
"""
self.image_label = QLabel()
self.image_label.setFixedSize(self.video_size)
self.quit_button = QPushButton("Quit")
self.quit_button.clicked.connect(self.close)
self.main_layout = QVBoxLayout()
self.main_layout.addWidget(self.image_label)
self.main_layout.addWidget(self.quit_button)
self.setLayout(self.main_layout)
def setup_camera(self):
"""Initialize camera.
"""
self.capture = cv2.VideoCapture(0)
self.capture.set(cv2.CAP_PROP_FRAME_WIDTH, self.video_size.width())
self.capture.set(cv2.CAP_PROP_FRAME_HEIGHT, self.video_size.height())
self.timer = QTimer()
self.timer.timeout.connect(self.display_video_stream)
self.timer.start(30)
def display_video_stream(self):
"""Read frame from camera and repaint QLabel widget.
"""
_, frame = self.capture.read()
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
frame = cv2.flip(frame, 1)
image = qimage2ndarray.array2qimage(frame) #SOLUTION FOR MEMORY LEAK
self.image_label.setPixmap(QPixmap.fromImage(image))
if __name__ == "__main__":
app = QApplication(sys.argv)
win = MainApp()
win.show()
sys.exit(app.exec_())
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There is a huge memory leak when I run this code, I have changed the streaming resolution to 1920x1080. If the
self.timer.start(30)
is changed to 250 milliseconds, the memory leak is slower but still present. Any way to stop the mem leak?