视频抽帧转图片，opencv和ffmpeg效果测评

使用python开发均值滤波调试器

• 简介
• 效果
• 源码

简介

用来调试均值滤波效果的小工具，滑动条可以控制均值滤波核的大小，用来查看不同滤波核下的均值滤波效果。

效果

源码

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QHBoxLayout, QPushButton, QLabel, QFileDialog, QSlider
from PyQt5.QtGui import QPixmap, QImage
from PyQt5.QtCore import Qt
import cv2
import numpy as np


class ImageDisplayWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
        self.image = None

    def initUI(self):
        self.main_layout = QVBoxLayout()
        self.resize(820, 620)

        self.open_button = self.create_button("打开图片", self.open_image)
        self.img_win = QWidget()
        img_win_layout = QHBoxLayout()
        self.img_win.setLayout(img_win_layout)

        self.orgin_img_label = QLabel()
        self.image_label = QLabel()
        self.add_image_view(img_win_layout, "原图", self.orgin_img_label)
        self.add_image_view(img_win_layout, "处理后的图", self.image_label)

        self.slider = self.create_slider(self.process_image)
        self.slider2 = self.create_slider(self.process_image)

        self.slider_value_label = QLabel("滤波核大小: 0x0")
        controls_layout = QHBoxLayout()
        self.add_control(controls_layout, "滤波核大小（ksize）:", self.slider, self.slider_value_label)
        controls_layout2 = QHBoxLayout()

        self.main_layout.addWidget(self.open_button)
        self.main_layout.addWidget(self.img_win)
        self.main_layout.addLayout(controls_layout)
        self.main_layout.addLayout(controls_layout2)
        self.setLayout(self.main_layout)

        self.setWindowTitle('均值滤波调试器')
        self.set_common_style(self.slider_value_label)
        # self.set_common_style()
        self.show()

    def add_image_view(self, layout, label_text, image_label):
        image_view_layout = QVBoxLayout()
        name_label = QLabel(label_text)
        name_label.setAlignment(Qt.AlignCenter)
        image_view_layout.addWidget(image_label, alignment=Qt.AlignCenter)
        image_view_layout.addWidget(name_label, alignment=Qt.AlignCenter)
        layout.addLayout(image_view_layout)
        self.set_common_style(name_label)

    def create_button(self, text, clicked_slot):
        button = QPushButton(text)
        button.clicked.connect(clicked_slot)
        self.set_common_style(button)
        return button

    def create_slider(self, value_changed_slot):
        slider = QSlider(Qt.Horizontal)
        slider.setMinimum(1)
        slider.setMaximum(100)
        slider.valueChanged.connect(value_changed_slot)
        self.set_slider_style(slider)
        return slider

    def add_control(self, layout, label_text, slider, value_label):
        control_label = QLabel(label_text)
        layout.addWidget(control_label)
        layout.addWidget(slider)
        layout.addWidget(value_label)
        self.set_common_style(control_label)

    def set_common_style(self, label):
        label.setStyleSheet("""  
            QLabel {  
                font-family: '微软雅黑';  
                font-size: 12pt;  
                color: red;  
            }
            QPushButton {  
                font-family: '微软雅黑';  
                font-size: 12pt;  
                color: red;  
            }  
        """)

    def set_slider_style(self, slider):
        slider.setStyleSheet("""  
            QSlider::groove:horizontal {  
                background: #999999;  
                height: 8px;  
                margin: 0;  
                border-radius: 4px;  
            }  
            QSlider::handle:horizontal {  
                background: red;  
                border: 1px solid #999999;  
                width: 16px;  
                height: 16px;  
                margin: -7px 0; /* handle is placed in the middle */  
                border-radius: 8px;  
            }  
            QSlider::add-page:horizontal {  
                background: #FF0000; /* This is the red color from your font color */  
            }  
            QSlider::sub-page:horizontal {  
                background: #555555; /* You can choose a different color for the filled part */  
            }  
        """)

    def open_image(self):
        self.filename, _ = QFileDialog.getOpenFileName(self, '打开图片', '.', '图片文件 (*.png *.jpg *.jpeg *.bmp)')
        if self.filename:
            self.image = cv2.imread(self.filename)
            or_img = cv2.cvtColor(self.image, cv2.COLOR_BGR2RGB)
            h, w, ch = or_img.shape
            bytes_per_line = ch * w
            q_img = QImage(or_img.data, w, h, bytes_per_line, QImage.Format_RGB888)
            pixmap = QPixmap.fromImage(q_img)
            if pixmap.width() > 600 or pixmap.height() > 600:
                pixmap = pixmap.scaled(600, 600, Qt.KeepAspectRatio, Qt.SmoothTransformation)
            self.orgin_img_label.setPixmap(pixmap)
            self.process_image()

    def process_image(self):
        if self.image is None:
            return
        kernel_size = self.slider.value()
        self.slider_value_label.setText(f"矩形核大小: {kernel_size}x{kernel_size}")
        processed_image = cv2.blur(self.image, (kernel_size, kernel_size))
        processed_image = cv2.cvtColor(processed_image, cv2.COLOR_BGR2RGB)
        h, w, ch = processed_image.shape
        bytes_per_line = ch * w
        q_img = QImage(processed_image.data, w, h, bytes_per_line, QImage.Format_RGB888)
        pixmap = QPixmap.fromImage(q_img)
        if pixmap.width() > 600 or pixmap.height() > 600:
            pixmap = pixmap.scaled(600, 600, Qt.KeepAspectRatio, Qt.SmoothTransformation)

        self.image_label.setPixmap(pixmap)


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