bmp2.rar_bmp图像_bmp缩小_图像放大

#include "stdafx.h" #include <math.h> class CBmp : public CObject { public: CBmp(); CBmp(const CBmp& a); virtual ~CBmp(); public: LPBITMAPINFO bmi; LPBYTE pBits; public: BOOL Read(CString FileName); //读入图像 BOOL Write(CString FileName); //存储图像 int GetPaletteSize() const; //调色板大小 int GetBytesPerLine() const; //图像每行实际占字节数 int GetWidth() const; //宽度 int GetHeight() const; //高度 BOOL IsValid() const; //图像是否有效 BOOL IsGrayScaleImage() const; //判断是灰度图像 BOOL ToGrayScaleImage(); //转换为256级灰度图像 BOOL ProduceHistogramData(int PixelNum[]) const; //产生原图直方图 void Equalize(); //直方图均衡化处理图像 void NegtivePhaseChange(); //反色变换 void Binarize(int threshold); //二值化 void SegmentalLinearTransformate(int x1,int y1,int x2,int y2);//分段线性变换 void LogAlter(int c); //灰度对数变换 void PowerAlter(float c, float r, float b); //灰度幂次变换 void ExpAlter(float b, float c, float a); //灰度指数变换 public: CBmp& operator=(const CBmp& bmp); //重载运算符 private: BOOL TwoToGray(); //黑白图像转为256级灰度图像 BOOL FourToGray(); //16色彩色图像转为256级灰度图像 BOOL EightToGray(); //256色彩色图像转为256级灰度图像 BOOL TrueColorToGray(); //真彩色图像转为256级灰度图像 } CBmp::CBmp() { bmi = NULL; pBits = NULL; } CBmp::CBmp(const CBmp& a) { int infoSize = sizeof(BITMAPINFOHEADER) + a.GetPaletteSize() * sizeof(RGBQUAD); bmi = (LPBITMAPINFO)new BYTE[infoSize]; memcpy( (LPVOID)bmi, (LPVOID)a.bmi,infoSize); pBits = new BYTE[bmi->bmiHeader.biSizeImage]; memcpy( (LPVOID)pBits,(LPVOID)a.pBits,bmi->bmiHeader.biSizeImage); } CBmp::~CBmp() { if(bmi) { delete bmi; bmi = NULL; } if(pBits) { delete pBits; pBits = NULL; } } CBmp& CBmp::operator=(const CBmp& a) { if(this == &a) return *this; if(bmi) delete bmi; if(pBits) delete pBits; int infoSize = sizeof(BITMAPINFOHEADER) + a.GetPaletteSize() * sizeof(RGBQUAD); bmi = (LPBITMAPINFO)new BYTE[infoSize]; memcpy( (LPVOID)bmi, (LPVOID)a.bmi,infoSize); pBits = new BYTE[bmi->bmiHeader.biSizeImage]; memcpy( (LPVOID)pBits,(LPVOID)a.pBits,bmi->bmiHeader.biSizeImage); return *this; } BOOL CBmp::Read(CString FileName) { CFile file; BITMAPFILEHEADER bmfh; //打开文件 if(!file.Open(FileName,CFile::modeRead)) { AfxMessageBox("File cannot open!"); return FALSE; } //读文件信息头 file.Read( (LPVOID)&bmfh, sizeof(bmfh) ); if(bmfh.bfType != 0x4d42) { AfxMessageBox("This is not a bmp file!"); return FALSE; } if(bmi) { delete bmi; bmi = NULL; } if(pBits) { delete pBits; pBits = NULL; } //读位图信息头和调色板 int infoSize = bmfh.bfOffBits - sizeof(bmfh); bmi = (LPBITMAPINFO)new BYTE[infoSize]; file.Read( (LPVOID)bmi, infoSize); if(bmi->bmiHeader.biBitCount!=1 && bmi->bmiHeader.biBitCount!=4 && bmi->bmiHeader.biBitCount!=8 && bmi->bmiHeader.biBitCount!=24) { AfxMessageBox("The number of colors is not valid!"); return FALSE; } //读图像数据 pBits = new BYTE[bmi->bmiHeader.biSizeImage]; file.Read( (LPVOID)pBits, bmi->bmiHeader.biSizeImage); return TRUE; } BOOL CBmp::Write(CString FileName) { CFile file; BITMAPFILEHEADER bmfh; if(! (bmi && pBits)) { AfxMessageBox("Data is not valid!"); return FALSE; } //创建文件 if(!file.Open(FileName,CFile::modeCreate | CFile::modeWrite)) { AfxMessageBox("File creating fails!"); return FALSE; } //填写文件信息头 bmfh.bfType = 0x4d42; bmfh.bfReserved1 = bmfh.bfReserved2 = 0; int nInfoSize = sizeof(BITMAPINFOHEADER) + GetPaletteSize() * sizeof(RGBQUAD); bmfh.bfOffBits = sizeof(bmfh) + nInfoSize; bmfh.bfSize = bmfh.bfOffBits + bmi->bmiHeader.biSizeImage; //写文件 file.Write( (LPVOID)&bmfh, sizeof(bmfh)); file.Write( (LPVOID)bmi, nInfoSize); file.Write( (LPVOID)pBits, bmi->bmiHeader.biSizeImage); return TRUE; } int CBmp::GetPaletteSize() const { switch(bmi->bmiHeader.biBitCount) { case 1: return 2; case 4: return 16; case 8: return 256; case 24: return 0; default: return -1; } } int CBmp::GetBytesPerLine() const { return bmi->bmiHeader.biSizeImage / bmi->bmiHeader.biHeight; } int CBmp::GetWidth() const { if(bmi) return bmi->bmiHeader.biWidth; else return 0; } int CBmp::GetHeight() const { if(bmi) return bmi->bmiHeader.biHeight; else return 0; } BOOL CBmp::IsValid() const { return bmi && pBits; } BOOL CBmp::IsGrayScaleImage() const { if(bmi->bmiHeader.biBitCount != 8) return FALSE; else { for(int i = 0; i<256; ++i) if( !(bmi->bmiColors[i].rgbBlue == bmi->bmiColors[i].rgbGreen && bmi->bmiColors[i].rgbGreen == bmi->bmiColors[i].rgbRed) ) return FALSE; } return TRUE; } BOOL CBmp::ToGrayScaleImage() { switch(GetPaletteSize()) { case 2: return TwoToGray(); case 16: return FourToGray(); case 256: return EightToGray(); case 0: return TrueColorToGray(); default: return FALSE; } } BOOL CBmp::TwoToGray() { LPBITMAPINFO newbmi = (LPBITMAPINFO)new BYTE[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)];//申请新信息头空间 memcpy( (LPVOID)newbmi, (LPVOID)bmi, sizeof(BITMAPINFOHEADER));//拷贝位图信息头 newbmi->bmiHeader.biBitCount = 8;//修改位图信息头信息 int newBytesPerLine = (int)( (bmi->bmiHeader.biWidth * 8 + 31) / 32 ) * 4;//每行实际字节数 newbmi->bmiHeader.biSizeImage = newBytesPerLine * newbmi->bmiHeader.biHeight;//修改位图信息头信息 //生成新调色板 LPRGBQUAD pRGBQUQD = &(newbmi->bmiColors[0]); for (int i = 0; i < 256; ++i) { pRGBQUQD[i].rgbRed = pRGBQUQD[i].rgbGreen = pRGBQUQD[i].rgbBlue = i; pRGBQUQD[i].rgbReserved = 0; } //新图像数据 LPBYTE newpBits = new BYTE[newbmi->bmiHeader.biSizeImage]; int originalBytePosition, newBytePosition; for (i = 0; i < newbmi->bmiHeader.biHeight; ++i) { WORD test = 0x0080; for (int j = 0; j < newbmi->bmiHeader.biWidth; ++j) { originalBytePosition = i * GetBytesPerLine() + j / 8;//原图中该像素所在的字节号 newBytePosition = i * newBytesPerLine + j;//新图中该像素所在的字节号 if(pBits[originalBytePosition] & (test>>(j%8)) )//该像素在原图中对应的数据位 newpBits[newBytePosition] = 0xff; else newpBits[newBytePosition] = 0; } while(newBytePosition%4 != 3)//处理填充字节 newpBits[++newBytePosition] = 0; } delete bmi; bmi = newbmi; delete pBits; pBits = newpBits; return TRUE; } BOOL CBmp::FourToGray() { LPBITMAPINFO newbmi = (LPBITMAPINFO)new BYTE[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)];//申请新信息头空间 memcpy( (LPVOID)newbmi, (LPVOID)bmi, sizeof(BITMAPINFOHEADER));//拷贝位图信息头 newbmi->bmiHeader.biBitCount = 8;//修改位图信息头信息 int newBytesPerLine = (int)( (bmi->bmiHeader.biWidth * 8 + 31) / 32 ) * 4;//每行实际字节数 newbmi->bmiHeader.biSizeImage = newBytesPerLine * newbmi->bmiHeader.biHeight;//修改位图信息头信息 //生成新调色板 LPRGBQUAD pRGBQUQD = &(newbmi->bmiColors[0]); for (int i = 0; i < 256; ++i) { pRGBQUQD[i].rgbRed = pRGBQUQD[i].rgbGreen = pRGBQUQD[i].rgbBlue = i; pRGBQUQD[i].rgbReserved = 0; } LPBYTE newpBits = new BYTE[newbmi->bmiHeader.biSizeImage]; int originalBytePosition, newBytePosition,index; pRGBQUQD = &(bmi->bmiColors[0]); for (i = 0; i < newbmi->bmiHeader.biHeight; ++i) { for (int j = 0; j < newbmi->bmiHeader.biWidth; ++j) { originalBytePosition = i * GetBytesPerLine() + j / 2;//原图中该像素所在的字节号 newBytePosition = i * newBytesPerLine + j;//新图中该像素所在的字节号 if(j%2 == 0)//提取前半字节 { index = pBits[originalBytePosition] / 16; newpBits[newBytePosition] = (BYTE)( (float)pRGBQUQD[index].rgbRed * 0.299 + (float)pRGBQUQD[index].rgbGreen * 0.587