2018-10-16|2018-10-16 pyqt5+opencv读取摄像头数据并显示
准备写个pyqt5显示摄像头，百度一看，居然全是要csdn下载的！！！！于是我很伤心，人与人之间基本的信任都没有了，随手写了一个，贴上来。
#coding=utf-8
import cv2
【2018-10-16|2018-10-16 pyqt5+opencv读取摄像头数据并显示】import numpy as np
import time
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
class Camera:
def __init__(self, width=320, height=240):
self.cap = cv2.VideoCapture(0)
self.image= QImage()
self.width = width
self.height = height
ret, frame = self.cap.read()
frame = cv2.resize(frame, (self.width, self.height))
self.h, self.w, self.bytesPerComponent = frame.shape
self.bytesPerLine = self.bytesPerComponent * self.w
def ReturnOneQPixmap(self):
# get a frame
ret, frame = self.cap.read()
frame = cv2.resize(frame, (self.width, self.height))
if ret:
if frame.ndim == 3:
rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
elif frame.ndim == 2:
rgb = cv2.cvtColor(frame, cv2.COLOR_GRAY2BGR)
self.image = QImage(rgb.data, self.w, self.h, self.bytesPerLine, QImage.Format_RGB888)
return QPixmap.fromImage(self.image)
def DestroyCamera(self):
cap.release()
cv2.destroyAllWindows()
class VideoBox(QWidget):
def __init__(self):
QWidget.__init__(self)
self.setWindowFlags(Qt.CustomizeWindowHint)
self.camera = Camera(320, 320)
self.pictureLabel = QLabel()
self.pictureLabel.setFixedSize(320, 240)
self.pictureLabel.setObjectName("Camera")
self.combo = QComboBox()
self.combo.addItem('Video')
self.combo.addItem('Stop')
self.combo.activated[str].connect(self.onActivatd)
control_box = QHBoxLayout()
control_box.setContentsMargins(0, 0, 0, 0)
control_box.addWidget(self.combo)
layout = QVBoxLayout()
layout.addWidget(self.pictureLabel)
layout.addLayout(control_box)
self.setLayout(layout)
self.video_timer = VideoTimer()
self.video_timer.timeSignal.signal[str].connect(self.showframe)
def onActivatd(self, text):
if text == 'Video':
self.video_timer.start()
print('Video')
if text == 'Stop':
self.video_timer.stop()
quit()
def showframe(self):
self.pictureLabel.setPixmap(self.camera.ReturnOneQPixmap())
class Communicate(QObject):
signal = pyqtSignal(str)
class VideoTimer(QThread):
def __init__(self, frequent=20):
QThread.__init__(self)
self.stopped = False
self.frequent = frequent
self.timeSignal = Communicate()
self.mutex = QMutex()
def run(self):
with QMutexLocker(self.mutex):
self.stopped = False
while True:
if self.stopped:
return
self.timeSignal.signal.emit("1")
time.sleep(1 / self.frequent)
def stop(self):
with QMutexLocker(self.mutex):
self.stopped = True
def is_stopped(self):
with QMutexLocker(self.mutex):
return self.stopped
def set_fps(self, fps):
self.frequent = fps
if __name__ == "__main__":
app = QApplication(sys.argv)
box = VideoBox()
# box.showFullScreen()
box.show()
sys.exit(app.exec_())
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