// 圖像字符化
cv::Mat Characterize(cv::Mat src)
{
	// 初始化
	cv::Mat re;
	cv::resize(src, re, cv::Size(0, 0), 0.05, 0.05);
	cv::Mat result = cv::Mat(src.size(), CV_8UC1, 255);
	if (src.channels() > 1)
	{
		cout << "The number of image channels is greator than 1. " << endl;
		return result;
	}
 
	// 字符繪制
	string str = "";
	int row = re.rows;
	int col = re.cols;
	for (int i = 0; i < row; ++i)
	{
		uchar *t = re.ptr<uchar>(i);
		for (int j = 0; j < col; ++j)
		{
			string temp;
			char c = Getchar(int(t[j]));
			temp.push_back(c);
			// 繪制字符
			putText(result, temp, cv::Point(j * 20, (i + 1) * 20), cv::FONT_HERSHEY_TRIPLEX, 0.6, cv::Scalar(0), 1, 16);
			str += c;
		}
		str += "\r\n";
	}
 
	// 輸出txt
	OutToFile(txt, str);
 
	return result;
}

#include <iostream>
#include <opencv.hpp>
#include <string>
#include <sstream>
#include <Windows.h>
#include <fstream>
 
using namespace std;
 
const string ascii_char = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ";
const char *txt = "test.txt";
 
// 獲取字符
char Getchar(int n)
{
	int size = ascii_char.size();
	int t = n * size / 256 ;
	char c = ascii_char[t];
	return c;
}
 
//將字符串寫入文件
void OutToFile(const char *fileName, string str) {
	ofstream outStream;
	outStream.open(fileName);
	outStream << str << endl;
	outStream.close();
}
 
// 圖像字符化
cv::Mat Characterize(cv::Mat src)
{
	// 初始化
	cv::Mat re;
	cv::resize(src, re, cv::Size(0, 0), 0.05, 0.05);
	cv::Mat result = cv::Mat(src.size(), CV_8UC1, 255);
	if (src.channels() > 1)
	{
		cout << "The number of image channels is greator than 1. " << endl;
		return result;
	}
 
	// 字符繪制
	string str = "";
	int row = re.rows;
	int col = re.cols;
	for (int i = 0; i < row; ++i)
	{
		uchar *t = re.ptr<uchar>(i);
		for (int j = 0; j < col; ++j)
		{
			string temp;
			char c = Getchar(int(t[j]));
			temp.push_back(c);
			// 繪制字符
			putText(result, temp, cv::Point(j * 20, (i + 1) * 20), cv::FONT_HERSHEY_TRIPLEX, 0.6, cv::Scalar(0), 1, 16);
			str += c;
		}
		str += "\r\n";
	}
 
	// 輸出txt
	OutToFile(txt, str);
 
	return result;
}
 
int main()
{
	// 加載灰度圖
	cv::Mat src = cv::imread("6.jpg", 0);
 
	// 圖像字符化
	cv::Mat result = Characterize(src);
 
	// 顯示
	cv::imshow("src", src);
	cv::imshow("result", result);
	cv::waitKey(0);
 
	system("pause");
	return 0;
}