OK4418开发板qt opencv 如何调用USB摄像头
本帖最后由 njxnet 于 2019-3-22 16:10 编辑开发板移植了opencv2.4.9。
QT代码如下：
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QImage>
#include <QTimer> // 设置采集数据的间隔时间
#include <opencv/highgui.h>//包含opencv库头文件
#include <opencv/cv.h>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
private slots:
void openCamara(); // 打开摄像头
void readFarme(); // 读取当前帧信息
void closeCamara(); // 关闭摄像头。
void takingPictures();// 拍照
private:
Ui::Widget *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;//申请IplImage类型指针，就是申请内存空间来存放每一帧图像
};
#endif // WIDGET_H
widget.cpp
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
cam = NULL ;
timer = new QTimer(this);
imag = new QImage();
connect(timer,SIGNAL(timeout()),this,SLOT(readFarme())); //时间到，读取当前摄像头信息
connect(ui->OpenCameraPushButton,SIGNAL(clicked()),this,SLOT(openCamara()));
connect(ui->TakePhotoPushButton,SIGNAL(clicked()),this,SLOT(takingPictures()));
connect(ui->CloseCameraPushButton,SIGNAL(clicked()),this,SLOT(closeCamara()));
}
void Widget::openCamara()
{
cam = cvCreateCameraCapture(-1);//打开摄像头，从摄像头中获取视频
timer->start(33); // 开始计时，超时则发出timeout()信号
}
void Widget::readFarme()
{
frame = cvQueryFrame(cam);
QImage image((const uchar*)frame->imageData, frame->width,frame->height,QImage::Format_RGB888);
ui->label->setPixmap(QPixmap::fromImage(image));
}
void Widget::takingPictures()
{
frame = cvQueryFrame(cam);
QImage image((const uchar*)frame->imageData, frame->width,frame->height,QImage::Format_RGB888);
ui->label_2->setPixmap(QPixmap::fromImage(image));
}
void Widget::closeCamara()
{
timer->stop();
cvReleaseCapture(&cam);
}
Widget::~Widget()
{
delete ui;
delete timer;
delete imag;
delete frame;
}
main.cpp
#include "widget.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
.pro
#-------------------------------------------------
#
# Project created by QtCreator 2019-03-21T20:20:55
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = Opencv_pro1
TEMPLATE = app
SOURCES += main.cpp\
widget.cpp
INCLUDEPATH += /usr/local/opencv/install_opencv/include/\
/usr/local/opencv/install_opencv/include/opencv\
/usr/local/opencv/install_opencv/include/opencv2
LIBS += /usr/local/opencv/install_opencv/lib/libopencv_calib3d.so\
/usr/local/opencv/install_opencv/lib/libopencv_contrib.so\
/usr/local/opencv/install_opencv/lib/libopencv_core.so\
/usr/local/opencv/install_opencv/lib/libopencv_features2d.so\
/usr/local/opencv/install_opencv/lib/libopencv_flann.so\
/usr/local/opencv/install_opencv/lib/libopencv_gpu.so\
/usr/local/opencv/install_opencv/lib/libopencv_highgui.so \
/usr/local/opencv/install_opencv/lib/libopencv_imgproc.so\
/usr/local/opencv/install_opencv/lib/libopencv_legacy.so\
/usr/local/opencv/install_opencv/lib/libopencv_ml.so\
/usr/local/opencv/install_opencv/lib/libopencv_nonfree.so\
/usr/local/opencv/install_opencv/lib/libopencv_objdetect.so\
/usr/local/opencv/install_opencv/lib/libopencv_ocl.so\
/usr/local/opencv/install_opencv/lib/libopencv_photo.so\
/usr/local/opencv/install_opencv/lib/libopencv_stitching.so\
/usr/local/opencv/install_opencv/lib/libopencv_superres.so\
/usr/local/opencv/install_opencv/lib/libopencv_video.so\
/usr/local/opencv/install_opencv/lib/libopencv_videostab.so
HEADERS+= widget.h
FORMS += widget.ui
出现的问题：交叉编译移植ARM，点击PushButton打开摄像头，超级终端一直输出 VIDIOC_QUERYCTRL: Inappropriate ioctl for device
很抱歉，没有遇到过类似问题
是兼容性问题吗？uvc驱动里有VIDIOC_QUERYCTRL 遇到同样的问题，贴主解决了么？
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