基于OpenCV的抠图程序

    最近为了建立图片数据库，要进行抠图，在使用了Windows自带的截图软件之后，发现非常的麻烦，每次都要直接打开图片，抠图，然后还要输入保存的文件名字，这种纯手工的方式，要多长时间才能搞定十万张图片。

    本着能偷懒就偷懒的想法，在实际的数据库建立过程中，打开一个目录下面的文件和将抠出来的图保存下来的过程，根本不需要人的参与，因为这两部分都可以由程序自己来完成，因此，就产生了基于OpenCV的抠图程序。

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    要解决在每个文件夹下面的图片都进行处理，需要解决下面三个问题：

1. 读取一个文件夹下面的所有文件；
2. 显示图片，并获得鼠标在图片上面选择的矩形框；
3. 自动生成文件的名字并保存选择的区域。

    对于第一个问题，已经在另外一个博客中描述了。

    对于第二个问题，通过查看OpenCV的帮助文档可以知道，可以通过setMouseCallback函数在图片显示窗口中添加鼠标事件的回调函数，从而获得鼠标的坐标，同时也能获得鼠标的事件，例如鼠标右键点击、左键点击和鼠标移动等事件。通过将鼠标左键点击时的坐标作为开始点的坐标，将鼠标左键释放时的坐标作为结束点的坐标，并通过一定的处理，将

    对于第三个问题，文件的名字可以使用数字的表示，而保持选定的区域，可以通过将选定的区域设置为图片的ROI，从而使用OpenCV的imwrite函数将ROI区域保存为图片的格式。

    具体的实现代码如下：

    functions.h

/*M///
// Copyright (c) 2014, sheng
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//
//     * Redistributions in binary form must reproduce the above copyright notice,
//       this list of conditions and the following disclaimer in the documentation
//       and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//M*/



#ifndef FUNCTIONS_H
#define FUNCTIONS_H

#include <QStringList>
#include <string>
#include "opencv2/opencv.hpp"

QStringList GetFilesInDirectory(const QString &Directory);

bool SaveImageInJPEG(const std::string& FileName, const cv::Mat& Image);

bool Screenshot(cv::Mat Image, const std::string& FileName,
                const int& StartedX, const int& StartedY,
                const int& EndedX, const int& EndedY);

void OnMouse( int Event, int X, int Y, int flag, void* Userdata);


std::string IntToString(int value);

bool DrawRectangle(cv::Mat& Image, const int& StartedX, const int& StartedY,
                   const int& EndedX, const int& EndedY,
                   const cv::Scalar& Color = cv::Scalar(255,0,0),
                   int Thickness = 2, int LintType = 8);

bool MakingRectanglePoint(int& StartedX, int& StartedY,
                          int& EndedX, int& EndedY);

#endif // FUNCTIONS_H

   userdata.h

/*M///
// Copyright (c) 2014, sheng
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//
//     * Redistributions in binary form must reproduce the above copyright notice,
//       this list of conditions and the following disclaimer in the documentation
//       and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//M*/




#ifndef USERDATA_H
#define USERDATA_H

#include <string>
#include "opencv2/opencv.hpp"

/**
 * @brief The UserData struct Use to contain the window name and the image.
 *
 * @author sheng
 * @date   2014-08-27
 * @version 0.1
 *
 * @history
 *     <author>       <date>         <version>        <description>
 *