pyqt 视频流同时生成直方图

可以使用OpenCV库来读取视频流并生成直方图，然后再使用PyQt来显示视频和直方图。以下是示例代码：

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

class VideoWidget(QWidget):
    def __init__(self):
        super().__init__()

        # 创建用于显示视频和直方图的标签
        self.video_label = QLabel()
        self.hist_label = QLabel()

        # 创建垂直布局并将标签添加到其中
        layout = QVBoxLayout()
        layout.addWidget(self.video_label)
        layout.addWidget(self.hist_label)
        self.setLayout(layout)

        # 打开视频流
        self.cap = cv2.VideoCapture(0)

    def update(self):
        # 从视频流中读取帧
        ret, frame = self.cap.read()

        if ret:
            # 将帧转换为Qt图像
            frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            height, width, channels = frame.shape
            bytes_per_line = channels * width
            qt_image = QImage(frame.data, width, height, bytes_per_line, QImage.Format_RGB888)

            # 显示视频
            self.video_label.setPixmap(QPixmap.fromImage(qt_image))
            self.video_label.setAlignment(Qt.AlignCenter)

            # 生成直方图
            hist, bins = np.histogram(frame.ravel(), 256, [0,256])
            hist_image = np.zeros((256, 256, 3), dtype=np.uint8)
            cv2.normalize(hist, hist, 0, 255, cv2.NORM_MINMAX)
            hist = np.int32(np.around(hist))
            for i in range(256):
                cv2.line(hist_image, (i, 255), (i, 255 - hist[i]), (255, 0, 0), 1)

            # 将直方图转换为Qt图像
            hist_image = cv2.cvtColor(hist_image, cv2.COLOR_BGR2RGB)
            height, width, channels = hist_image.shape
            bytes_per_line = channels * width
            qt_hist = QImage(hist_image.data, width, height, bytes_per_line, QImage.Format_RGB888)

            # 显示直方图
            self.hist_label.setPixmap(QPixmap.fromImage(qt_hist))
            self.hist_label.setAlignment(Qt.AlignCenter)

        # 每隔10毫秒更新一次
        QApplication.processEvents()
        QTimer.singleShot(10, self.update)

if __name__ == '__main__':
    app = QApplication([])
    widget = VideoWidget()
    widget.resize(800, 600)
    widget.show()
    widget.update()
    app.exec_()

此代码将打开默认的摄像头并显示视频和直方图。每隔10毫秒，它将更新一次视频和直方图。请注意，此代码仅适用于Windows操作系统。如果您正在使用其他操作系统，则可能需要对代码进行一些修改。