abandon/Day5 20200404219 刘道龙/DigitDev.py

from PyQt5.QtCore import QThread, pyqtSignal
import cv2

class DigitDev(QThread):
    
    signal_video = pyqtSignal(int, int, int, bytes)

    def __init__(self):
        super(DigitDev, self).__init__()
        self.is_over = False
        # 初始化设备
        self.dev = cv2.VideoCapture(0, cv2.CAP_DSHOW)


    def run(self):
        while not self.is_over:
            # 图像抓取
            status, image = self.dev.read()
            # 状态判定
            if not status:
                self.dev.release()
                self.exit(0)
            # 如果抓取图像成功，发送
            shape = image.shape
            image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
            self.signal_video.emit(shape[0], shape[1], shape[2], image.tobytes())
            # 视觉暂停
            QThread.usleep(100000)

    def close(self):
        self.is_over = True
        while self.isRunning():
            pass
        # 释放设备
        if self.dev.isOpened():
            self.dev.release()