pyqt5用label显示灰度图片的直方图

可以使用OpenCV库中的calcHist函数计算灰度图像的直方图，然后使用PyQt5中的QChart和QChartView类来显示直方图。具体实现可以参考OpenCV和PyQt5的官方文档和示例代码。

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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！

pyqt5用Label显示灰度图片的直方图的代码

以下是使用 pyqt5 显示灰度图片的直方图的代码：

import sys
from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow
from PyQt5.QtChart import QChart, QChartView, QBarSet, QBarSeries, QValueAxis

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

        # 读取灰度图片
        image = QImage('gray_image.png')
        image = image.convertToFormat(QImage.Format_Grayscale8)

        # 计算直方图
        histogram = [] * 256
        for y in range(image.height()):
            for x in range(image.width()):
                pixel_value = image.pixelColor(x, y).red()
                histogram[pixel_value] += 1

        # 创建柱状图
        bar_set = QBarSet('灰度直方图')
        for i in range(256):
            bar_set.append(histogram[i])
        bar_series = QBarSeries()
        bar_series.append(bar_set)
        chart = QChart()
        chart.addSeries(bar_series)
        chart.setTitle('灰度直方图')
        chart.setAnimationOptions(QChart.SeriesAnimations)

        # 设置 X 轴
        axis_x = QValueAxis()
        axis_x.setRange(, 255)
        axis_x.setTickCount(16)
        axis_x.setLabelFormat('%d')
        chart.addAxis(axis_x, Qt.AlignBottom)
        bar_series.attachAxis(axis_x)

        # 设置 Y 轴
        axis_y = QValueAxis()
        axis_y.setRange(, max(histogram))
        axis_y.setTickCount(5)
        chart.addAxis(axis_y, Qt.AlignLeft)
        bar_series.attachAxis(axis_y)

        # 显示柱状图
        chart_view = QChartView(chart)
        chart_view.setRenderHint(QPainter.Antialiasing)
        self.setCentralWidget(chart_view)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

希望对你有所帮助！