049
03.09.2003, 17:11 Uhr
Pablo
Supertux
(Operator)
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| C++: |
#include <iostream>
#include <stdio.h>
using namespace std;
//int _filter[] ={1,0,1,0,-4,0,1,0,1};
//int _filter[] ={1,1,1,1,1,1,1,1,1}; //glättungsfilter
//int _filter[] ={-1,-1,-1,0,0,0,1,1,1}; //gradientenfilterx
//int _filter[] ={-1,0,1,-1,0,1,-1,0,1}; //gradientenfiltery
//int _filter[] ={1,2,1,0,0,0,-1,-2,-1}; //sobelfilterx
//int _filter[] ={-1,0,1,-2,0,-2,-1,0,-1}; //sobelfiltery
int _filter[] ={1,2,1,2,4,2,1,2,1};//binominalfilter
#define c 120
//int _filter[] ={-1,2,-1,-2,12+c,-2,-1,2,-1}; //laplace-binominalfilter
void filter(int* &picture,int xdim, int ydim);
int* bmp2raw(char* bmp_filename, int& xdim, int& ydim){
FILE *fp=fopen(bmp_filename,"rb");
int *raw_data;
int i,j;
fseek(fp,10,SEEK_CUR);
j=fgetc(fp);
j+=fgetc(fp)*256;
j+=fgetc(fp)*256*256;
j+=fgetc(fp)*256*256*256;
fseek(fp,4,SEEK_CUR);
xdim=fgetc(fp);
xdim+=fgetc(fp)*256;
xdim+=fgetc(fp)*256*256;
xdim+=fgetc(fp)*256*256*256;
ydim=fgetc(fp);
ydim+=fgetc(fp)*256;
ydim+=fgetc(fp)*256*256;
ydim+=fgetc(fp)*256*256*256;
raw_data= new int[xdim*ydim];
fseek(fp,j-26,SEEK_CUR);
for(j=ydim-1;j>=0;j--){
for(i=0;i<xdim;i++){
raw_data[i+j*xdim]=fgetc(fp);
}
}
fclose(fp);
return raw_data;
}
void raw2bmp(int* raw_data,char* bmp_filename, int xdim, int ydim){
FILE *fp;
int i,j;
fp=fopen(bmp_filename,"wb");
i=xdim*ydim + 4*256 + 54; //Dateilaenge ermitteln
//Datei-Header schreiben
fputc(66,fp);fputc(77,fp); //Magic Number
j=i%256; fputc(j,fp); //Dateilaenge
j=(i%(256*256))/256; fputc(j,fp);
j=(i%(256*256*256))/(256*256); fputc(j,fp);
j=i/(256*256*256); fputc(j,fp);
fputc(0,fp);fputc(0,fp);fputc(0,fp);fputc(0,fp);//4 reservierte Byts
fputc(54,fp);fputc(4,fp);fputc(0,fp);fputc(0,fp);//Zeiger auf Datenanfang
//Format-Header schreiben
fputc(40,fp);fputc(0,fp);fputc(0,fp);fputc(0,fp);//Format-Header-Laenge
j=xdim%256; fputc(j,fp); //Bildbreite
j=(xdim%(256*256))/256; fputc(j,fp);
j=(xdim%(256*256*256))/(256*256); fputc(j,fp);
j=xdim/(256*256*256); fputc(j,fp);
j=ydim%256; fputc(j,fp); //Bildhoehe
j=(ydim%(256*256))/256; fputc(j,fp);
j=(ydim%(256*256*256))/(256*256); fputc(j,fp);
j=ydim/(256*256*256); fputc(j,fp);
fputc(1,fp);fputc(0,fp); //Anzahl der Ebenen
fputc(8,fp);fputc(0,fp); //Bits pro Pixel
fputc(0,fp);fputc(0,fp);fputc(0,fp);fputc(0,fp); //Kompression
i=xdim*ydim;
j=i%256; fputc(j,fp); //Groesse der Pixeldaten
j=(i%(256*256))/256; fputc(j,fp);
j=(i%(256*256*256))/(256*256); fputc(j,fp);
j=i/(256*256*256); fputc(j,fp);
fputc(0,fp);fputc(0,fp);fputc(0,fp);fputc(0,fp); //x-Auflösung(in Pixel pro Meter)
fputc(0,fp);fputc(0,fp);fputc(0,fp);fputc(0,fp); //y-Auflösung(in Pixel pro Meter)
fputc(0,fp);fputc(0,fp);fputc(0,fp);fputc(0,fp); //Anzahl genutzter Farben
fputc(0,fp);fputc(0,fp);fputc(0,fp);fputc(0,fp); //Anzahl wichtiger Farben
for(i=0;i<256;i++){fputc(i,fp);fputc(i,fp);fputc(i,fp);fputc(0,fp);}
for(j=ydim-1;j>=0;j--){
for(i=0;i<xdim;i++){
fputc(raw_data[i+j*xdim],fp);
}
}
fclose(fp);
}
int Pixel(int* picture,int x, int y,int xdim, int ydim)
{
if (x<0 || y <0 || x > xdim - 1 || y > ydim -1) return 0;
return picture[x+y*xdim];
}
void filter(int* &picture,int xdim, int ydim){
int newpixel;
int* newpic;
newpic = new int[xdim*ydim];
for(int y=0; y<ydim-1; ++y) {
for (int x=0; x<xdim-1; ++x) {
newpixel = _filter[0]*Pixel(picture, x-1,y-1,xdim,ydim) + _filter[1]*Pixel(picture, x,y-1,xdim,ydim) +_filter[2]*Pixel(picture, x+1,y-1,xdim,ydim)
+ _filter[3]*Pixel(picture, x-1,y,xdim,ydim) + _filter[4]*Pixel(picture, x,y,xdim,ydim) +_filter[5]*Pixel(picture, x+1,y,xdim,ydim)
+ _filter[6]*Pixel(picture, x-1,y+1,xdim,ydim) + _filter[7]*Pixel(picture, x,y-1,xdim,ydim) +_filter[8]*Pixel(picture, x+1,y+1,xdim,ydim);
newpic[x+y*xdim] = newpixel;
}
}
picture = newpic;
//delete [] newpic;
}
int main(int argc, char** argv)
{
int* pic;
if (argc < 3) {
cout << "usage: " << argv[0] << " [input file] [output file]\n";
return 0;
}
int xdim, ydim, *picture;
picture = bmp2raw(argv[1], xdim, ydim);
filter(picture, xdim,ydim);
raw2bmp(picture, argv[2], xdim,ydim);
}
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--
A! Elbereth Gilthoniel!
silivren penna míriel
o menel aglar elenath,
Gilthoniel, A! Elbereth! |
