findrect

#include <iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
using namespace std;
using namespace cv;

void hist_xy(Mat imgsrc,int *ax,int *ay);

int main()
{
    //getImage
    Mat imgsrc=imread("E:\\01project\\02find_rect\\01imageSrc\\image_39.jpg");
    imwrite("E:\\01imgsrc.jpg",imgsrc);

    //分离rgb
    vector<Mat> vRGB;
    split(imgsrc,vRGB);
    Mat imgRed=Mat::zeros(imgsrc.size(),CV_8UC1);
    imgRed=vRGB.at(2)-vRGB.at(1);
    imgRed=imgRed-vRGB.at(0);
    for(int i=0;i<imgRed.rows;i++)
    {
        for (int j=0;j<imgRed.cols;j++)
        {
            if(!((i<imgRed.rows/4 && j<imgRed.cols/4) || (i>imgRed.rows*3/4 && j>imgRed.cols*3/4)))
            {
                imgRed.at<uchar>(i,j)=0;
            }
        }
    }
    imwrite("E:\\02imgr.jpg",imgRed);

    Mat imgbw=Mat::zeros(imgsrc.size(),CV_8UC1);
    //cv::adaptiveThreshold(imgRed,imgbw,255,CV_ADAPTIVE_THRESH_MEAN_C,CV_THRESH_BINARY,51,15);
    //adaptiveThreshold(imgRed,imgbw, 255, CV_ADAPTIVE_THRESH_MEAN_C, CV_THRESH_BINARY_INV,151,5);
    cv::threshold(imgRed,imgbw,CV_THRESH_OTSU,255,THRESH_BINARY);
    imwrite("E:\\03imgbw.jpg",imgbw);

    //正交投影
    int *xh=new int[imgbw.rows];
    int *yh=new int[imgbw.cols];
    hist_xy(imgbw,xh,yh);
    
//     for (int i=0;i<imgbw.rows;i++)
//     {
//         for (int j=0;j<imgbw.cols;j++)
//         {
//             
//             if (xh[i]>0)
//             {
//                 for (int k=0;k<xh[i];k++)
//                 {
//                     imgsrc.at<Vec3b>(i,k)[0]=0;
//                     imgsrc.at<Vec3b>(i,k)[1]=0;
//                     imgsrc.at<Vec3b>(i,k)[2]=255;
//                 }
//             }
//             if (yh[j]>0)
//             {
//                 for (int k=0;k<yh[j];k++)
//                 {
//                     imgsrc.at<Vec3b>(k,j)[0]=0;
//                     imgsrc.at<Vec3b>(k,j)[1]=0;
//                     imgsrc.at<Vec3b>(k,j)[2]=255;
//                 }
//             }
//         }
//     }
//    imwrite("E:\\04投影.jpg",imgsrc);


    //连续5个以上的像素点大于100进入条件
    //
    Point px1=(0,0);//从中间开始寻找第一个连续5行5列>100的点
    for (int i=imgbw.rows/2;i<imgbw.rows-4;i++)
    {
        if (xh[i-2]>100 && xh[i-1]>100 && xh[i]>100 && xh[i+1]>100 && xh[i+2]>100)
        {
            px1.y=i;
            break;
        }
    }
    for (int i=imgbw.cols/2;i<imgbw.cols-4;i++)
    {
        if (yh[i-2]>100 && yh[i-1]>100 && yh[i]>100 && yh[i+1]>100 && yh[i+2]>100)
        {
            px1.x=i;
            break;
        }
    }

    Point px2=(0,0);//从中间开始寻找第一个连续5行5列>100的点
    for (int i=imgbw.rows/2;i>4;i--)
    {
        if (xh[i-2]>100 && xh[i-1]>100 && xh[i]>100 && xh[i+1]>100 && xh[i+2]>100)
        {
            px2.y=i;
            break;
        }
    }
    for (int i=imgbw.cols/2;i>4;i--)
    {
        if (yh[i-2]>100 && yh[i-1]>100 && yh[i]>100 && yh[i+1]>100 && yh[i+2]>100)
        {
            px2.x=i;
            break;
        }
    }

    for(int i=0;i<imgbw.rows;i++)
    {
        for (int j=0;j<imgbw.cols;j++)
        {
            if (i>px2.y && i<px1.y && j>px2.x && j<px1.x)
            {
                imgsrc.at<Vec3b>(i,j)[0]=0;
                imgsrc.at<Vec3b>(i,j)[1]=1;
                imgsrc.at<Vec3b>(i,j)[2]=255;
            }
        }
    }

    if (px1.x==0 || px1.y==0 ||px2.x==0 || px2.y==0 || abs(px2.x-px1.x)<2300 ||abs(px2.y-px1.y)<1600)
    {
        cout<<"cannot find the Rect"<<endl;
        getchar();
    }
    imwrite("E:\\04投影.jpg",imgsrc);
    return 0;
}

//投影函数xy平面
void hist_xy(Mat imgsrc,int *ax,int *ay)
{
    //int *ax=new int[imgsrc.rows];
    int xtemp;
    //int *ay=new int[imgsrc.cols];
    int ytemp;
    for (int i=0;i<imgsrc.rows;i++)
    {
        ax[i]=0;
        xtemp=0;
        for (int j=0;j<imgsrc.cols;j++)
        {
            if (imgsrc.at<uchar>(i,j)==255)
            {
                xtemp++;
            }
        }
        ax[i]=xtemp;
    }

    for (int j=0;j<imgsrc.cols;j++)
    {
        ay[j]=0;
        ytemp=0;
        for (int i=0;i<imgsrc.rows;i++)
        {
            if (imgsrc.at<uchar>(i,j)==255)
            {
                ytemp++;
            }
        }
        ay[j]=ytemp;
    }
    //delete ax;
    //delete ay;
}