setPixmap导致使用退出代码1完成的过程

Question

我从函数(find_defects)返回一个图像。我看到这是一个有效的图像。

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在使用return之前，我使用cv2.imshow检查图像，这也和我预期的一样。但是，当我试图在我用PyQt设计的GUI上显示这个图像时，我看到了这个错误：

Process finished with exit code 1

编辑:最小可复制示例：

from PyQt5.QtCore import *
import cv2
from PyQt5.QtWidgets import QLabel, QWidget, QPushButton, QVBoxLayout, QApplication
from PyQt5.QtGui import QPixmap, QImage


class first_GUI(QWidget):
    def __init__(self):
        # super(first_GUI, self).__init__()
        # super().__init__()
        QWidget.__init__(self)
        self.frame_defects = cv2.imread('output.jpg')
        self.label_text = QLabel("Hi")
        self.label_text.setAlignment(Qt.AlignCenter)
        self.label_text.setStyleSheet("color: rgb(0,0,255);font-weight: bold; font-size: 16pt")
        pushButton_show = QPushButton("Show")
        pushButton_show.setMinimumHeight(40)
        pushButton_show.setStyleSheet("font-weight: bold; font-size: 16pt")
        pushButton_show.clicked.connect(self.show_image)
        vertical_layout = QVBoxLayout()
        vertical_layout.addWidget(self.label_text)
        vertical_layout.addWidget(pushButton_show)
        self.setLayout(vertical_layout)
        self.setWindowTitle("PyQt5 first GUI")
        self.resize(400, 300)


    def show_image(self):

        if self.frame_defects is not None:
            image = QImage(self.frame_defects, self.frame_defects.shape[1], self.frame_defects.shape[0],
                           QImage.Format_RGB888)  # The image is stored using a 24-bit RGB format (8-8-8).
            self.pixmap2 = QPixmap.fromImage(image)
        self.label.setPixmap(self.pixmap2)

app = QApplication([])
widget = first_GUI()
widget.show()
app.exec_()  

图片：

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Answer 1

考虑使用QGraphicsView而不是标签。

# Create scene
self.image_item = QGraphicsPixmapItem()
scene = QGraphicsScene(self)
scene.addItem(self.image_item)

# Create GraphicView display
self.view = QGraphicsView(scene, self)
image = QImage(self.frame_defects, self.frame_defects.shape[1], self.frame_defects.shape[0], self.frame_defects.shape[1]*3, QImage.Format_RGB888)
self.image_item.setPixmap(QPixmap.fromImage(image))
self.view.fitInView(self.image_item)

还请注意，self.frame_defects的dtype是‘uint8 8’，如果您不在QImage构造函数中指定bytesperline参数，它将被转换为'uint32‘或’it 32‘。因此，为了保持图像每行的字节数，我使用了一个不同的QImage构造函数：

QImage(self.frame_defects, self.frame_defects.shape[1], self.frame_defects.shape[0], self.frame_defects.shape[1]*3, QImage.Format_RGB888)

编辑:我在我的PyCharm中尝试了这段代码，它起作用了：

from PyQt5.QtCore import *
import cv2
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *


class first_GUI(QWidget):
    def __init__(self):
        # super(first_GUI, self).__init__()
        # super().__init__()
        QWidget.__init__(self)
        self.frame_defects = cv2.imread('output.jpg')
        self.image_item = QGraphicsPixmapItem()
        scene = QGraphicsScene(self)
        scene.addItem(self.image_item)
        self.view = QGraphicsView(scene, self)

        pushButton_show = QPushButton("Show")
        pushButton_show.setMinimumHeight(40)
        pushButton_show.setStyleSheet("font-weight: bold; font-size: 16pt")
        pushButton_show.clicked.connect(self.show_image)

        vertical_layout = QVBoxLayout()
        vertical_layout.addWidget(self.view)
        vertical_layout.addWidget(pushButton_show)

        self.setLayout(vertical_layout)
        self.setWindowTitle("PyQt5 first GUI")
        self.resize(400, 300)

    def show_image(self):
        image = QImage(self.frame_defects, self.frame_defects.shape[1], self.frame_defects.shape[0], self.frame_defects.shape[1]*3, QImage.Format_RGB888)
        self.image_item.setPixmap(QPixmap.fromImage(image))
        self.view.fitInView(self.image_item)


app = QApplication([])
widget = first_GUI()
widget.show()
app.exec_()

edit2：

在image.rgbSwapped构造函数之后添加QImage =QImage()：

    def show_image(self):
    image = QImage(self.frame_defects, self.frame_defects.shape[1], self.frame_defects.shape[0], self.frame_defects.shape[1]*3, QImage.Format_RGB888)
    image = image.rgbSwapped()
    self.image_item.setPixmap(QPixmap.fromImage(image))
    self.view.fitInView(self.image_item)