如何基于opencv實(shí)現(xiàn)簡(jiǎn)單的數(shù)字識(shí)別

#include opencv2/core/core.hpp>
#include opencv.hpp>
#include opencv2/highgui/highgui.hpp>
#include opencv2/features2d/features2d.hpp>
#include opencv2/imgproc/imgproc.hpp>
#include iostream>
#include ctime>
using namespace std ;
using namespace cv;
#include map>
Mat src_threshold;
Mat src_dil;
int sunImage(Mat image);
vectorMat>ROI_image;//待測(cè)圖片
int main() 
{
	clock_t start ,finish;
	start=clock();
	Mat src;
	src=imread("D:\\vspic\\picture\\number6.jpg");
	resize(src,src,Size(src.cols/7,src.rows/7));
	imshow("src",src);
	Mat src_gray;
	cvtColor(src,src_gray,COLOR_BGR2GRAY);
	//imshow("gsrc_ray",src_gray);
	Mat src_blur;
	blur(src_gray,src_blur,Size(9,9));
	//GaussianBlur(src_gray,src_blur,Size(11,11),1,1);
	Mat src_threshold;
	threshold(src_blur,src_threshold,150,255,THRESH_OTSU);
	//imshow("src_threshold",src_threshold);
	Mat src_canny;
	Canny(src_threshold,src_canny,125,255,3);
	//imshow("src_canny",src_canny);
	vectorvectorPoint>>contours_src;
	vectorVec4i>hierarchy_src(contours_src.size());
	findContours(src_canny,contours_src,hierarchy_src,RETR_EXTERNAL,CHAIN_APPROX_NONE);
	Rect rect_s;
	Rect choose_rect;
	for (size_t i=0;icontours_src.size();i++)
	{
		rect_s=boundingRect(contours_src[i]);
		double width=rect_s.width;
		double height= rect_s.height;
		double bizhi=width/height;
		if (bizhi>1.5height>50)
		{
			/*rectangle(src,rect_s.tl(),rect_s.br(),Scalar(255,255,255),1,1,0);*/
			choose_rect=Rect(rect_s.x+20,rect_s.y+30,rect_s.x-30,rect_s.y-108);
		}
	}
	Mat roi;
	roi=src(choose_rect);
	//imshow("src_",roi);
	Mat img =roi;
	Mat gray_img;
	// 生成灰度圖像
	cvtColor(img, gray_img, CV_BGR2GRAY);
	// 高斯模糊
	Mat img_gau;
	GaussianBlur(gray_img, img_gau, Size(3, 3), 0, 0);
	// 閾值分割
	Mat img_seg;
	threshold(img_gau, img_seg, 0, 255, THRESH_BINARY + THRESH_OTSU);
	Mat element;
	element=getStructuringElement(MORPH_RECT,Size(8,8));
	erode(img_seg,src_dil,element);
	//imshow("src_dil",src_dil);
	// 邊緣檢測(cè)，提取輪廓
	Mat img_canny;
	Canny(src_dil, img_canny, 200, 100);
	//imshow("canny",img_canny);
	vectorvectorPoint>> contours;
	vectorVec4i> hierarchy(contours.size());
	findContours(img_canny, contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE, Point());//尋找輪廓
	int size = (int)(contours.size());//輪廓的數(shù)量
	//coutsizeendl;6個(gè)
	// 保存符號(hào)邊框的序號(hào)
	vectorint> num_order;//定義一個(gè)整型int容器
	mapint, int> num_map;//容器，需要關(guān)鍵字和模板對(duì)象兩個(gè)模板參數(shù)，此處定義一個(gè)int作為索引，并擁有相關(guān)連的指向int的指針
	for (int i = 0; i  size; i++)
   {
		// 獲取邊框數(shù)據(jù)
		Rect number_rect = boundingRect(contours[i]);
		int width = number_rect.width;//獲取矩形的寬
		int height = number_rect.height;//獲取矩形的高
		// 去除較小的干擾邊框，篩選出合適的區(qū)域
		if (width > img.cols/20 )
		{
			rectangle(img,number_rect.tl(),number_rect.br(),Scalar(255,255,255),1,1,0);//繪制矩形
			imshow("img",img);//顯示矩形框
			num_order.push_back(number_rect.x);//把矩形的x坐標(biāo)放入number_order容器中，將一個(gè)新的元素添加到vector的最后面，
			//位置為當(dāng)前元素的下一個(gè)元素
			num_map[number_rect.x] = i;//向map中存入鍵值對(duì)，number_rect.x是關(guān)鍵字，i是值
			/*把矩形框的x坐標(biāo)與對(duì)應(yīng)的i值一起放入map容器中，形成一一對(duì)應(yīng)的鍵值對(duì)
			*/
		}
	}
	// 按符號(hào)順序提取
	sort(num_order.begin(), num_order.end());/*把number_order容器中的內(nèi)容按照從小到大的順序排列,這里面是X的坐標(biāo)*/
	for (int i = 0; i  num_order.size(); i++) {
		Rect number_rect = boundingRect(contours[num_map.find(num_order[i])->second]);//num_order里面放的是坐標(biāo)
		//cout"num_map的值是："num_map.find(num_order[i])->secondendl;
		Rect choose_rect(number_rect.x, 0, number_rect.width, img.rows);//矩形左上角x,y的坐標(biāo)以及矩形的寬和高
		Mat number_img = img(choose_rect);
		resize(number_img,number_img,Size(30,100));//歸一化尺寸
		ROI_image.push_back(number_img);//保存為待測(cè)圖片
		//imshow("number" + to_string(i), number_img);
		char name[50];
		sprintf_s(name,"D:\\vs2012\\model\\%d.jpg",i);//保存模板
		imwrite(name, number_img);	
	}
	cout"圖片分割完畢"endl;
	//加載模板
	vectorMat>temptImage;//存放模板
	for (int i=0;i4;i++)
	{
		char name[50];
		sprintf_s(name,"D:\\vs2012\\model\\%d.jpg",i);
		Mat temp;
		temp=imread(name);
		//cout"加載模板圖片通道數(shù)："temp.channels()endl;
		temptImage.push_back(temp);
	}
	vectorint>seq;//存放順序結(jié)果
	for (int i=0;iROI_image.size();i++)
	{
		Mat subImage;
		int sum=0;
		int min=50000;
		int seq_min=0;//記錄最小的和對(duì)應(yīng)的數(shù)字
		for (int j=0;j4;j++)
		{
			absdiff(ROI_image[i],temptImage[j],subImage);//待測(cè)圖片像素減去模板圖片像素
			sum=sunImage(subImage);//統(tǒng)計(jì)像素和
			if (summin)
			{
				min=sum;
			    seq_min=j;
			}
			sum=0;
		}
		seq.push_back(seq_min);
	}
	cout"輸出數(shù)字匹配結(jié)果:";//endl是換行的意思
	for (int i=0;iseq.size();i++)//輸出結(jié)果，小數(shù)點(diǎn)固定在第3位
	{
		coutseq[i];
		if (i==1)
		{
			cout".";
		}
	}
	finish=clock();
	double all_time=double(finish-start)/CLOCKS_PER_SEC;
	/*cout"運(yùn)行總時(shí)間是："all_timeendl;*/
	waitKey(0);
	return 0;
}
//計(jì)算像素和
int sunImage(Mat image)
{
	int sum=0;
	for (int i=0;iimage.cols;i++)
	{
		for (int j=0;jimage.rows;j++)
		{
			sum+=image.atuchar>(j,i);
		}
	}
	return sum;
}