C实现彩色图灰度化源代码

#include<iostream> using namespace std; #include<stdio.h> #include<windows.h> void read_sfile(char *fileName,int &imageHeight,int &imageWidth,unsigned char *Imgdata[2000], int &x, int &y) { int biBitCount; int raw_bytesize; int size=0; FILE *fp=fopen(fileName,"rb"); if(fp==NULL) { cout<<"can not open this file.\n"; exit(1); } fseek(fp,sizeof(BITMAPFILEHEADER),0); BITMAPINFOHEADER info; fread(&info,sizeof(BITMAPINFOHEADER),1,fp); //int y; x=info.biXPelsPerMeter; y=info.biYPelsPerMeter; biBitCount=info.biBitCount; if(biBitCount==8) { size=1024; } imageHeight=info.biHeight; imageWidth=info.biWidth; raw_bytesize=(imageWidth*3+3)/4*4; fseek(fp,sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+size,0); /* image_data=(unsigned char *)malloc(raw_bytesize*imageHeight*sizeof(unsigned char)); fread(image_data,sizeof(unsigned char),raw_bytesize*imageHeight,fp);*/ //unsigned char *Imgdata[2000]; int i,j; for ( i=0;i<imageHeight;i++) Imgdata[i]=new unsigned char[(imageWidth*3+3)/4*4]; for ( i=0;i<imageHeight;i++ ) for(j=0;j<(imageWidth*3+3)/4*4;j++) fread(&Imgdata[i][j],1,1,fp); // return Imgdata; // return image_data; } void Init_grayimage(char *fileName,int h,int w,unsigned char *Imgdata[2000],int x,int y) { FILE *fp1=fopen(fileName,"wb"); if(fp1==NULL) { cout<<"can not open this file.\n"; return ; } BITMAPFILEHEADER filehead; filehead.bfType=0x4D42; int biBitCount=8; int raw_bytesize=(w+3)/4*4; filehead.bfSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+256*sizeof(RGBQUAD)+raw_bytesize*h; filehead.bfReserved1=0; filehead.bfReserved2=0; filehead.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+256*sizeof(RGBQUAD); BITMAPINFOHEADER head; head.biBitCount=biBitCount; head.biClrImportant=0; head.biClrUsed=0; head.biCompression=BI_RGB; head.biHeight=h; head.biPlanes=1; head.biSize=40; head.biSizeImage=raw_bytesize*h; head.biWidth=w; head.biXPelsPerMeter=x; head.biYPelsPerMeter=y; fwrite(&filehead,sizeof(BITMAPFILEHEADER),1,fp1); fwrite(&head,sizeof(BITMAPINFOHEADER),1,fp1); RGBQUAD *ipRGB2; ipRGB2=(RGBQUAD *)malloc(256*sizeof(RGBQUAD)); int i; for(i=0;i<256;i++) { ipRGB2[i].rgbRed = ipRGB2[i].rgbGreen = ipRGB2[i].rgbBlue = i; ipRGB2[i].rgbReserved=0; } fwrite(ipRGB2,sizeof(RGBQUAD),256,fp1); unsigned char *image2; // int raw_bytesize; // raw_bytesize=(w+3)/4*4; int bytesize; bytesize=raw_bytesize*h; image2=(unsigned char *)malloc(bytesize*sizeof(unsigned char)); /*for(i=0;i<bytesize;i++) image2[i]=(int)((float)(image_data[i]* * 0.299 +(float)(image_data[i+1] * 0.587)+(float)(image_data[i+2] * 0.114 ));*/ int j; int nLineStart2; for(i=0;i<h;i++) { nLineStart2 = raw_bytesize*i; for(j=0;j<raw_bytesize;j++) { image2[nLineStart2+j]=int( (float)Imgdata[i][3 * j] * 0.114 + \ (float)Imgdata[i][3 * j + 1] * 0.587 + \ (float)Imgdata[i][3 * j + 2] * 0.299 ); } } // image2[i*raw_bytesize+] // for(i=0;i<bytesize;i++) fwrite(image2,sizeof(unsigned char),bytesize,fp1); fclose(fp1); } void main() { int x=0,y=0; char *fileName="11.bmp"; char *fileName1="new_11.bmp"; unsigned char *Imgdata[2000]; int h=0,w=0; read_sfile(fileName,h,w, Imgdata,x,y); Init_grayimage(fileName1,h,w,Imgdata,x,y); }