圖像轉換成文本

轉自：http://blog.csdn.net/smells2/article/details/7338011

===============================================

此程序只能處理真彩色的bmp格式文件，如果沒有bmp格式的圖片可以使用windows自帶的畫圖工具轉換一下。

 

Image.h

#pragma once

#include "resource.h"


class CBitMapFile
{
protected:
    //位圖文件信息頭
    BITMAPFILEHEADER m_file_header;
    //位圖信息頭
    BITMAPINFOHEADER m_info_header;

    CFile m_hFile;
    //存儲位圖數據
    BYTE* m_imageArray;
    //去掉填充的無用字節，存儲剩下的純數據
    BYTE* m_realImageArray;
public:
    //整個文件大小
    DWORD m_sizeFile;
    //位圖數據的大小
    DWORD m_sizeImage;
    //文件頭所佔字節數
    DWORD m_offBits;
    //圖像的寬，即行
    LONG m_width;
    //圖像的高，即列
    LONG m_height;
    //一個像素有多少比特表示
    WORD m_bitCount;
    //每個像素的所佔字節數
    int m_bytePixel;
    //文件的填充字節
    int m_addByte;
    //文件名
    CString m_fileName;

public:

    CBitMapFile():m_imageArray(NULL),m_realImageArray(NULL),m_sizeFile(0),m_sizeImage(0),
                m_offBits(0),m_width(0),m_height(0),m_bitCount(0),m_bytePixel(0),m_addByte(0)
                ,m_fileName(""){}

    ~CBitMapFile()
    {
        delete m_realImageArray;
        delete m_imageArray;

    }

    int openfile(CString& str,int fileMode);
    int turn2Gray();
    int turn2Txt(CString txt_name);

};

 

Image.cpp

#include "stdafx.h"
#include "Image.h"
/**********************************
 *打開bmp格式文件,並初始化數據成員*
 **********************************/
int CBitMapFile::openfile(CString& str,int fileMode)
{
    if(!m_hFile.Open(str,fileMode))
    {

        return -1;
    }
    m_fileName = m_hFile.GetFileName();

    m_hFile.Read(&m_file_header,sizeof(BITMAPFILEHEADER));
    m_sizeFile = m_file_header.bfSize;
    m_offBits = m_file_header.bfOffBits;

    m_hFile.Read(&m_info_header,sizeof(BITMAPINFOHEADER));
    m_width = m_info_header.biWidth;
    m_height = m_info_header.biHeight;
    m_bitCount = m_info_header.biBitCount;
    m_bytePixel = m_bitCount>>3;
    m_sizeImage =((((m_width * m_bitCount) + 31) & ~31) / 8) * m_height;
    m_addByte = (4-(m_width*m_bytePixel)%4)%4;

    m_imageArray = new BYTE[m_sizeImage];
    memset(m_imageArray,0,m_sizeImage);
    m_hFile.Read(m_imageArray,m_sizeImage*sizeof(BYTE));

    m_realImageArray = new BYTE[m_width*m_height];
    memset(m_realImageArray,0,m_width*m_height);

    return 1;
}
/********************************************
 *將文件轉換成灰度圖像，再對圖像做歸一化處理*
 ********************************************/
int CBitMapFile::turn2Gray()
{




    if (m_imageArray == NULL)
    {
        return -2;
    }

    for (int i =0,j= 0;i<m_sizeImage;)
    {
        //轉換爲灰度圖像，注意填充的字節
        BYTE blue,green,red,gray;

        blue = m_imageArray[i];
        green = m_imageArray[i+1];
        red = m_imageArray[i+2];

        gray = (BYTE)(0.3*red+0.59*green+0.11*blue);

        m_imageArray[i] = gray;
        m_imageArray[i+1] = gray;
        m_imageArray[i+2] = gray;

        m_realImageArray[j] = m_imageArray[i]>>5;

        i += 3;
        j++;

        ////跳過填充字節
        if (j % m_width == 0)
        {
            i += m_addByte;
        }

    }

    return 1;
}
/******************************************
 *對圖像的每個像素做文本映射，最終寫入文件*
 ******************************************/
int CBitMapFile::turn2Txt(CString txt_name)
{
    char* _txtBuf = new char[m_width*m_height+2*m_height];
    memset(_txtBuf,0,m_width*m_height+2*m_height);

    //文本映射
    char txtMap[8] = {'@','$','#','%','!','~','^','`'};

    char* _buf = new char[m_width+2];
    memset(_buf,0,m_width+2);
    TRACE(_T("\'\\r\'=%x,\'\\n\'=%x"),'\r','\n');
    for (int i = m_height-1;i>=0;i--)
    {
        for (int j = 0;j<m_width;j++)
        {
            _buf[j] = txtMap[m_realImageArray[i*m_width+j]];

        }

        _buf[m_width] = '\r';
        _buf[m_width+1] = '\n';

        for (int k=0;k<m_width+2;k++)
        {
            _txtBuf[(m_height-1-i)*m_width+k+(m_height-1-i)*2] = _buf[k];

        }
    }


    CFile txtFile;
    if (txtFile.Open(txt_name,CFile::modeCreate|CFile::modeNoInherit|CFile::modeWrite)==FALSE)
    {
        return -1;
    }

    txtFile.Write(_txtBuf,sizeof(char)*(m_width*m_height+2*m_height));
    txtFile.Close();
    delete _txtBuf;
    delete _buf;
    return 1;
}

 

main.cpp

// Image.cpp : 定義控制檯應用程序的入口點。
//

#include "stdafx.h"
#include "Image.h"
#include <iostream>
#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// 唯一的應用程序對象

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
    int nRetCode = 0;

    // 初始化 MFC 並在失敗時顯示錯誤
    if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    {
        // TODO: 更改錯誤代碼以符合您的需要
        _tprintf(_T("錯誤: MFC 初始化失敗\n"));
        nRetCode = 1;
    }
    else
    {
        // TODO: 在此處爲應用程序的行爲編寫代碼。
        if (argc<3)
        {
            std::cout<<"you should input like this:Image.exe (c:\\sourceFile.bmp) (c:\\goalFile.txt)\n"<<std::endl;
            return -1;
        }

        CBitMapFile bitFile;
        CString arg1 = argv[1];
        CString str = argv[2];
        if (bitFile.openfile(arg1,CFile::modeRead) != 1)
        {
            std::cout<<"ERROR:sourceFile.bmp open failed."<<std::endl;
            return -1;
        }

        if(bitFile.turn2Gray() != 1)
        {
            std::cout<<"ERROR:turn2Gray function failed."<<std::endl;
            return -1;
        }

        if (bitFile.turn2Txt(str) != 1)
        {
            std::cout<<"ERROR:turn2Txt function failed."<<std::endl;
            return -1;
        }


    }

    return nRetCode;
}