【原创】imread () 函数 读入图片的例子

Reference Links

Opencv+ qt5.1 完美配置 - 脚踏实地 - 博客频道 - CSDN.NET  http://blog.csdn.net/xiaojidan2011/article/details/9421193

【OpenCV】学习札记与源码分析: imread( )函数 - 综合  http://www.myexception.cn/other/1406789.html

openCV基础函数imread第二个参数 - qq764666379的专栏 - 博客频道 - CSDN.NET  http://blog.csdn.net/haoyunchao/article/details/18325875

源码解析: Imread函数 - 松子茶的专栏 - 博客频道 - CSDN.NET  http://blog.csdn.net/songzitea/article/details/11096287

---

代码：main.cpp

/* Time：   2016.12.07

 * Author： WJ

 * Function： 函数imread（） read a image

 * Reference：

 *        Opencv+ qt5.1 完美配置 - 脚踏实地 - 博客频道 - CSDN.NET 

 *        http://blog.csdn.net/xiaojidan2011/article/details/9421193

*/

#include <QCoreApplication>

#include <opencv2/core/core.hpp>

#include <opencv2/highgui/highgui.hpp>

#include "cv.h"

#include "cxcore.h"

#include "highgui.h"

using namespace cv;

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    //read a image

    Mat image= imread("F:QTcodesQTcreatorOpenCV_0011.png");

//  Mat image= imread("F:/QTcodes/QTcreator/OpenCV_001/1.png");

    if (image.empty())

    {

        namedWindow("can not find image : 1.png");

        waitKey(5000);

        return -1;

    }

    //creat image windows named "My Image"

    namedWindow("My Image",1);

    //show the image on window

    imshow("My Image",image);

    //wait key for 5000ms

    waitKey(0);

    return a.exec();

}

pro文件:

QT += core

QT -= gui

CONFIG += c++11

TARGET = OpenCV_001

CONFIG += console

CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

INCLUDEPATH+= E:opencv-2.4.13opencvuildincludeopencv

              E:opencv-2.4.13opencvuildincludeopencv2

              E:opencv-2.4.13opencvuildinclude

LIBS+=E:opencv-2.4.13opencvliblibopencv_calib3d249.dll.a

E:opencv-2.4.13opencvliblibopencv_contrib249.dll.a

E:opencv-2.4.13opencvliblibopencv_core249.dll.a

E:opencv-2.4.13opencvliblibopencv_features2d249.dll.a

E:opencv-2.4.13opencvliblibopencv_flann249.dll.a

E:opencv-2.4.13opencvliblibopencv_gpu249.dll.a

E:opencv-2.4.13opencvliblibopencv_highgui249.dll.a

E:opencv-2.4.13opencvliblibopencv_imgproc249.dll.a

E:opencv-2.4.13opencvliblibopencv_legacy249.dll.a

E:opencv-2.4.13opencvliblibopencv_ml249.dll.a

E:opencv-2.4.13opencvliblibopencv_objdetect249.dll.a

E:opencv-2.4.13opencvliblibopencv_video249.dll.a

 

遇到的error：

斜杠的方向错误。与windows 路径中的斜杠相反

 //read a image

    Mat image= imread("F:QTcodesQTcreatorOpenCV_0011.png");

//  Mat image= imread("F:/QTcodes/QTcreator/OpenCV_001/1.png");

imread的各个参数如下：

Mat imread(const string& filename, int flags)    

{

    Mat img;     //创建一个变量

    imread_(filename,flags,LOAD_MAT,&img);   //大多数功能由imread_()函数实现

    return img;

}

C++: Mat imread(const string& filename, int flags=1 )

filename – Name of file to be loaded.要加载的文件的名称

flags –

Flags specifying the color type of a loaded image:指定加载的图像的颜色类型的标志

 CV_LOAD_IMAGE_ANYDEPTH -

 If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit. 如果设置，当输入具有相应的深度时返回16位/ 32位图像，否则将其转换为8位。

CV_LOAD_IMAGE_COLOR -

If set, always convert image to the color one 如果设置，请始终将图像转换为

CV_LOAD_IMAGE_GRAYSCALE -

If set, always convert image to the grayscale one如果设置，请始终将图像转换为灰度图像

>0 Return a 3-channel color image.返回3通道彩色图像。

Note：   In the current implementation the alpha channel, if any, is stripped from the output image. Use negative value if you need the alpha channel.注意在当前实现中，alpha通道（如果有）从输出图像中去除。 如果您需要Alpha通道，请使用负值。

=0 Return a grayscale image.返回灰度图像。

<0 Return the loaded image as is (with alpha channel).返回加载的图像（使用alpha通道）