VS2017+Qt5+Opencv3.4调用摄像头拍照并存储

1. qt的ui界面，找着画就好

2.头文件直接贴出，之后有时间慢慢解释吧

#pragma once
 
#include <qtwidgets/qwidget>
#include "ui_camaraget.h"
 
#ifndef camaraget_h
#define camaraget_h
 
#include <opencv2\core\core.hpp>
#include <qwidget>
#include <qimage>
#include <qtimer>     // 设置采集数据的间隔时间
 
 
#include <qgraphicsscene>  
#include <qgraphicsview>  
 
#include <highgui/highgui_c.h>  //包含opencv库头文件
 
#include <opencv2\imgproc\imgproc.hpp>
#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>  //opencv申明
 
#include <opencv/cv.hpp>
using namespace cv;
 
namespace ui {
	class camaraget;
}
 
class camaraget : public qwidget
{
	q_object
 
public:
	explicit camaraget(qwidget *parent = 0);
	~camaraget();
 
private slots:
	void opencamara();      // 打开摄像头
	void getframe();       // 读取当前帧信息
	void closecamara();     // 关闭摄像头。
	void takingpictures();  // 拍照
 
private:
	ui::camaraget ui;
	qtimer    *timer;
	qimage    *imag;
	cvcapture *cam;// 视频获取结构， 用来作为视频获取函数的一个参数
	iplimage  *frame;
	videocapture capture1;
	mat showimage;
	qimage mat2qimage(mat cvimg);
 
//	camaraget(qwidget * parent);
	//申请iplimage类型指针，就是申请内存空间来存放每一帧图像
};
 
#endif // camaraget_h

3.源文件

#pragma once
 
#include <qtwidgets/qwidget>
#include "ui_camaraget.h"
 
#ifndef camaraget_h
#define camaraget_h
 
#include <opencv2\core\core.hpp>
#include <qwidget>
#include <qimage>
#include <qtimer>     // 设置采集数据的间隔时间
#include "camaraget.h"
#include<stdlib.h>
#include<random>
using namespace cv;
using namespace std;
 
 
 
 
 
camaraget::camaraget(qwidget *parent):
	qwidget(parent)
{
    ui.setupui(this);
	connect(ui.pushbutton, signal(clicked()), this, slot(opencamara()));
	connect(ui.pushbutton_2, signal(clicked()), this, slot(takingpictures()));
	connect(ui.pushbutton_3, signal(clicked()), this, slot(closecamara()));
	setwindowtitle(tr("main window"));
 
	timer = new qtimer(this);
	imag = new qimage();
	connect(timer, signal(timeout()), this, slot(getframe()));//超时就读取当前摄像头信息
}
camaraget::~camaraget()
{
 
}
 
void camaraget::opencamara()
{
	capture1.open(1);                                            //打开摄像头，从摄像头中获取视频
	timer->start(10);
	
}
 
void camaraget::getframe() {
	capture1 >> showimage;
	qimage imag = mat2qimage(showimage);
 
	ui.label_2->setscaledcontents(true);
	ui.label_2->setpixmap(qpixmap::fromimage(imag));
}
 
void camaraget::closecamara()
{
	timer->stop();
	ui.label->clear();
	capture1.release();
}
 
string strrand(int length) {			// length: 产生字符串的长度
	char tmp;							// tmp: 暂存一个随机数
	string buffer;						// buffer: 保存返回值
 
	
	random_device rd;					// 产生一个 std::random_device 对象 rd
	default_random_engine random(rd());	// 用 rd 初始化一个随机数发生器 random
 
	for (int i = 0; i < length; i++) {
		tmp = random() % 36;	
		if (tmp < 10) {			
			tmp += '0';
		}
		else {				
			tmp -= 10;
			tmp += 'a';
		}
		buffer += tmp;
	}
	return buffer;
}
 
 
void camaraget::takingpictures()
{
	capture1.open(1);
	capture1 >> showimage;
	qimage img = mat2qimage(showimage);
	ui.label->setscaledcontents(true);
	ui.label->setpixmap(qpixmap::fromimage(img));
 
	string writepath = "../tempphoto/";
	string name;
	int i = 0;
	name = writepath + strrand(4) + ".jpg";
	imwrite(name, showimage);
	i++;
 
}
 
 
qimage camaraget::mat2qimage(mat cvimg)
{
	// 8-bits unsigned, no. of channels = 1
	if (cvimg.type() == cv_8uc1)
	{
		qimage image(cvimg.cols, cvimg.rows, qimage::format_indexed8);
		// set the color table (used to translate colour indexes to qrgb values)
		image.setcolorcount(256);
		for (int i = 0; i < 256; i++)
		{
			image.setcolor(i, qrgb(i, i, i));
		}
		// copy input mat
		uchar *psrc = cvimg.data;
		for (int row = 0; row < cvimg.rows; row++)
		{
			uchar *pdest = image.scanline(row);
			memcpy(pdest, psrc, cvimg.cols);
			psrc += cvimg.step;
		}
		return image;
	}
	// 8-bits unsigned, no. of channels = 3
	else if (cvimg.type() == cv_8uc3)
	{
		// copy input mat
		const uchar *psrc = (const uchar*)cvimg.data;
		// create qimage with same dimensions as input mat
		qimage image(psrc, cvimg.cols, cvimg.rows, cvimg.step, qimage::format_rgb888);
		return image.rgbswapped();
	}
	else if (cvimg.type() == cv_8uc4)
	{
//		qdebug() << "cv_8uc4";
		// copy input mat
		const uchar *psrc = (const uchar*)cvimg.data;
		// create qimage with same dimensions as input mat
		qimage image(psrc, cvimg.cols, cvimg.rows, cvimg.step, qimage::format_argb32);
		return image.copy();
	}
	else
	{
//		qdebug() << "error: mat could not be converted to qimage.";
		return qimage();
	}
}
 
 
#include <qgraphicsscene>  
#include <qgraphicsview>  
 
#include <highgui/highgui_c.h>  //包含opencv库头文件
 
#include <opencv2\imgproc\imgproc.hpp>
#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>  //opencv申明
 
#include <opencv/cv.hpp>
using namespace cv;
 
namespace ui {
	class camaraget;
}
 
class camaraget : public qwidget
{
	q_object
 
public:
	explicit camaraget(qwidget *parent = 0);
	~camaraget();
 
private slots:
	void opencamara();      // 打开摄像头
	void getframe();       // 读取当前帧信息
	void closecamara();     // 关闭摄像头。
	void takingpictures();  // 拍照
 
private:
	ui::camaraget ui;
	qtimer    *timer;
	qimage    *imag;
	cvcapture *cam;// 视频获取结构， 用来作为视频获取函数的一个参数
	iplimage  *frame;
	videocapture capture1;
	mat showimage;
	qimage mat2qimage(mat cvimg);
 
//	camaraget(qwidget * parent);
	//申请iplimage类型指针，就是申请内存空间来存放每一帧图像
};
 
#endif // camaraget_h

4.运行效果

完整项目下载：qtwidgetsapplication2_jb51.rar

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