Question

我是PyQt5的新手。我一直在尝试创建一个交互式的OpenCV图像查看器，在此操作之后，我将能够立即查看该图像。就像说的那样，我正在对图像应用二进制阈值操作，并从PyQt滑块更改阈值。现在，我想在图像查看器中看到每个阈值图像。

为此，我使用python OpenCV和PyQT5 lib创建了一个非常基本的程序。但是，该图像不会在QLabel中更新。

下面是我的代码：

if(!CheckPerm()){
Log.d("info", "waiting for access" );}
else
{
Log.d("info", "access granted");
    finish()
}

我已经尝试过通过Google搜索找到的所有解决方案。但是，无法修复它。任何帮助或提示将不胜感激。

Answer 1

原始图像必须保持完整，但是您每次都要应用滤镜并对其进行修改，在下面的示例中，我展示了正确的方法

import sys
import cv2
import imutils
from PyQt5 import QtCore, QtGui, QtWidgets


class MyWindow(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()

        ori_img = cv2.imread("../resources/omr-1-ans-ori.png", cv2.IMREAD_COLOR)
        self.original_image_color = imutils.resize(ori_img, height=960)
        self.original_image_gray = cv2.cvtColor(self.original_image_color, cv2.COLOR_BGR2GRAY)

        self.thresh = False
        self.thresh_karnel_size = 11

        self.init_ui()

    def init_ui(self):
        self.imglabel = QtWidgets.QLabel(alignment=QtCore.Qt.AlignCenter)
        self.imglabel.setFixedSize(1200, 900)

        cb_thresh = QtWidgets.QCheckBox('thresh', checked=False)
        cb_thresh.stateChanged.connect(self.changeTitleThresh)

        self.thresh_slider = QtWidgets.QSlider(QtCore.Qt.Horizontal, 
            focusPolicy=QtCore.Qt.StrongFocus,
            tickPosition=QtWidgets.QSlider.TicksBothSides,
            tickInterval=1,
            singleStep=1,
            pageStep=1,
            minimum=1,
            maximum=127)
        self.thresh_slider.valueChanged[int].connect(self.threshSliderChangeValue)

        vbox = QtWidgets.QVBoxLayout(self)
        vbox.addWidget(cb_thresh)
        vbox.addWidget(self.thresh_slider)
        vbox.addWidget(self.imglabel)
        self.threshSliderChangeValue(self.thresh_slider.value())
        self.setGeometry(50, 50, 1200, 768)
        self.setWindowTitle('Learning PyQT5')
        self.show()

    @QtCore.pyqtSlot(int)
    def changeTitleThresh(self, state):
        self.thresh = state == QtCore.Qt.Checked
        self.threshSliderChangeValue(self.thresh_slider.value())

    @QtCore.pyqtSlot(int)
    def threshSliderChangeValue(self, value):
        ksize = (value * 2) + 1
        if ksize > 1 and ksize % 2 != 0 and self.thresh:
            self.thresh_karnel_size = ksize
            _, gray_img = cv2.threshold(self.original_image_gray, self.thresh_karnel_size, 255, cv2.THRESH_BINARY)
            gray_img_c = cv2.cvtColor(gray_img.copy(), cv2.COLOR_GRAY2BGR)
            self.updateImage(gray_img_c)
        else:
            self.updateImage(self.original_image_color)

    def updateImage(self, image):
        height, width, channel = image.shape
        bytesPerLine = 3 * width
        qImg = QtGui.QImage(image.data, width, height, bytesPerLine, QtGui.QImage.Format_RGB888)
        pixMap = QtGui.QPixmap.fromImage(qImg).scaled(700, 500, QtCore.Qt.KeepAspectRatio)
        self.imglabel.setPixmap(pixMap)


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    ex = MyWindow()
    sys.exit(app.exec_())

PyQt5 QLabel在OpenCV图像处理后未更新图像

1 个答案: