pyqt5用label显示灰度图片的直方图代码

以下是pyqt5用label显示灰度图片的直方图代码：

import cv2
import numpy as np
from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtWidgets import QLabel, QApplication, QMainWindow
from PyQt5.QtCore import Qt

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        # 读取灰度图片
        img = cv2.imread('gray_image.jpg', cv2.IMREAD_GRAYSCALE)

        # 计算直方图
        hist, bins = np.histogram(img.ravel(), 256, [, 256])

        # 创建画布
        canvas = np.zeros((100, 256, 3), dtype=np.uint8)

        # 绘制直方图
        for i in range(256):
            cv2.line(canvas, (i, ), (i, hist[i]), (255, 255, 255))

        # 转换为QImage
        qimage = QImage(canvas.data, canvas.shape[1], canvas.shape[], QImage.Format_RGB888)

        # 显示直方图
        label = QLabel(self)
        label.setPixmap(QPixmap.fromImage(qimage))
        label.setAlignment(Qt.AlignCenter)
        self.setCentralWidget(label)

if __name__ == '__main__':
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()

希望对你有帮助！