【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:\QTcodes\QTcreator\OpenCV_001\1.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-2.4.13\opencv\build\include\opencv\

E:\opencv-2.4.13\opencv\build\include\opencv2\

E:\opencv-2.4.13\opencv\build\include

LIBS+=E:\opencv-2.4.13\opencv\lib\libopencv_calib3d249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_contrib249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_core249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_features2d249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_flann249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_gpu249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_highgui249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_imgproc249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_legacy249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_ml249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_objdetect249.dll.a\

E:\opencv-2.4.13\opencv\lib\libopencv_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:\QTcodes\QTcreator\OpenCV_001\1.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）