Python--PyQT5图像

from PyQt5 import QtCore, QtGui
import sys
import cv2


if __name__ == '__main__':

    app = QtWidgets.QApplication(sys.argv)
    main_win = QtWidgets.QMainWindow()
    main_win.setWindowTitle("QLabel图像显示演示")
    image_label = QtWidgets.QLabel()
    txt_label = QtWidgets.QLabel()

    # 方法一：使用QtGui直接显示
    # pixmap = QtGui.QPixmap("./image/img1.png")
    # pix = pixmap.scaled(QtCore.QSize(640, 640), QtCore.Qt.KeepAspectRatio)  # 自动保持比例放缩方式

    # 方法二：使用cv2显示
    src = cv2.imread("./image/img1.png")   # BGR
    image = cv2.cvtColor(src, cv2.COLOR_BGR2RGB)   # 将BGR转为RGB
    h, w, c = image.shape
    img = QtGui.QImage(image.data, w, h, 3*w, QtGui.QImage.Format_RGB888)
    pixmap = QtGui.QPixmap(img)
    pix = pixmap.scaled(QtCore.QSize(640, 640), QtCore.Qt.KeepAspectRatio)  # 自动保持比例放缩方式
    image_label.setPixmap(pix)   # 设置图像显示
    image_label.setAlignment(QtCore.Qt.AlignCenter)   # label上的内容居中显示
    image_label.setStyleSheet("background-color:blue;color:green")    # 背景颜色设置
    # main_win.setCentralWidget(image_label)

    txt_label.setText("Hello, PyQT5")
    txt_label.setAlignment(QtCore.Qt.AlignCenter)   # label上居中显示
    txt_label.setStyleSheet("background-color:pink;color:green")    # 背景颜色设置
    font = QtGui.QFont()
    font.setBold(True)
    font.setPointSizeF(32)
    txt_label.setFont(font)

    panel = QtWidgets.QWidget()
    vboxlayout = QtWidgets.QVBoxLayout()
    vboxlayout.addWidget(txt_label)
    vboxlayout.addWidget(image_label)
    panel.setLayout(vboxlayout)
    main_win.setCentralWidget(panel)
    main_win.setMinimumSize(1080, 720)
    main_win.show()
    app.exec_()