qt 使用QCamera 实现简单的摄像头使用

最新推荐文章于 2025-05-26 12:10:41 发布

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本文介绍如何使用Qt自带的QCamera类实现摄像头监控功能。通过简单的代码示例，展示了启动摄像头、实时预览画面、捕获图片并保存等操作。

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qt 自带的摄像头QCamera可简单实现摄像头监控，话不多说，直接上代码！自己写的测试代码！

源码：

pro文件

#-------------------------------------------------

# Project created by QtCreator 2017-12-08T14:36:05

#-------------------------------------------------

QT       += core gui

QT       += multimedia

QT       += multimediawidgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = QCameraTest

TEMPLATE = app

SOURCES += main.cpp\

        widget.cpp

HEADERS  += widget.h

.h文件

#ifndef WIDGET_H

#define WIDGET_H

#include <QWidget>

class QCamera;

class QCameraViewfinder;

class QCameraImageCapture;

class Widget : public QWidget

    Q_OBJECT

public:

    Widget(QWidget *parent = 0);

    ~Widget();

private slots:

    void exitBtnResponded();

    void cameraImageCaptured(int,QImage);

private:

    QCamera*             m_pCamera;       //读取摄像头

    QCameraViewfinder*   m_pViewfinder;   //渲染摄像头

    QCameraImageCapture* m_pImageCapture; //获取摄像头当前帧

};

#endif // WIDGET_H

.cpp文件

#include "widget.h"

#include <QLayout>

#include <QLabel>

#include <QPushButton>

#include <QFileDialog>

#include <QCamera>

#include <QCameraViewfinder>

#include <QCameraImageCapture>

Widget::Widget(QWidget *parent)

    : QWidget(parent)

    setWindowTitle("QCamera");

    m_pCamera = new QCamera(this);

    m_pViewfinder = new QCameraViewfinder(this);

    m_pImageCapture = new QCameraImageCapture(m_pCamera);

    QPushButton* button1 = new QPushButton("Capture");

    QPushButton* button2 = new QPushButton("Exit");

    QVBoxLayout *mainLayout = new QVBoxLayout(this);

    mainLayout->addWidget(m_pViewfinder);

    mainLayout->addWidget(button1);

    mainLayout->addWidget(button2);

    connect(button1, SIGNAL(clicked()), m_pImageCapture, SLOT(capture()));

    connect(button2, SIGNAL(clicked()), this, SLOT(exitBtnResponded()));

    connect(m_pImageCapture, SIGNAL(imageCaptured(int,QImage)), this, SLOT(cameraImageCaptured(int,QImage)));

    m_pImageCapture->setCaptureDestination(QCameraImageCapture::CaptureToFile);

    m_pCamera->setCaptureMode(QCamera::CaptureStillImage);

    m_pCamera->setViewfinder(m_pViewfinder);

    m_pCamera->start();

Widget::~Widget()

    delete       m_pCamera;

    delete   m_pViewfinder;

    delete m_pImageCapture;

void Widget::exitBtnResponded()

    m_pCamera->stop();

    close();

void Widget::cameraImageCaptured(int, QImage image)

    QString savepath = QFileDialog::getSaveFileName(this,"Save Capture","Capture","Image png(*.png);;Image jpg(*.jpg);;Image bmp(*.bmp)");

    if(!savepath.isEmpty()){

        image.save(savepath);

完整项目下载地址：http://download.youkuaiyun.com/download/u012532263/10151298