File: /home/praveen/Desktop/Link toses/DIP/programs/readImage.cpp Page 1 of 2

/* The read program is invoked by: readimage inputfile outputfile */#include /* This header file defines the I/O functions */#include /* include standard dfeinitions like exit() */#define FALSE 0#define TRUE 1

int main(int argc, char **argv){FILE *fpIn;FILE *fpOut;char *string;char c;int highVal;int doneReading = FALSE;int numberOfRows, numberOfColumns, numberOfBands;int totalPixels;unsigned char *image;float meanF;int meanI;int i;

if (argc < 3) {fprintf(stderr,"Usage: readimage input-file-name output-file-name\n");exit;}

fpIn = fopen(argv[1],"rb"); /* argv[1] contains the filename */if (fpIn == NULL) {fprintf(stderr,"%s either cannot be read or does not exist\n", argv[1]);exit;}

string = (char *) calloc(256,1);/* initialized dynamic memory allocation */

while (!doneReading && (c = (char) fgetc(fpIn)) != '\0')switch(c) {

case 'P':c = (char) getc(fpIn);switch(c) {case '2':numberOfBands = 1;/* ppmType = PPMASCII; */break;case '3':numberOfBands = 3;/* ppmType = PPMASCII; */break;case '5':numberOfBands = 1;/* ppmType = PPMGRAY; */break;case '6':numberOfBands = 3;/* ppmType = PPMRAW; */break;}

c = (char) getc(fpIn);if (c != 0x0A) {ungetc(c,fpIn);}else {ungetc(c,fpIn);

File: /home/praveen/Desktop/Link toses/DIP/programs/readImage.cpp Page 2 of 2

fgets(string,256,fpIn);}break;case '#':fgets(string,256,fpIn);break;case '1':case '2':case '3':case '4':case '5':case '6':case '7':case '8':case '9':ungetc(c,fpIn);fscanf(fpIn,"%d %d %d", &numberOfColumns, &numberOfRows, &highVal);doneReading = TRUE;fgetc(fpIn);break;

}free(string);totalPixels = numberOfRows*numberOfColumns*numberOfBands;image = (unsigned char *) malloc(totalPixels);fread(image,1,totalPixels,fpIn);

/* find image mean*/

meanF = 0.0;meanI = 0;

for (i = 0; i < totalPixels; i++) {meanF += image[i];meanI += image[i];

}

meanI /= totalPixels;meanF /= (float) totalPixels;

fprintf(stdout,"meanI = %d meanF = %f\n", meanI, meanF);fpOut = fopen(argv[2],"wb");

fprintf(fpOut,"P%d\n%d %d\n255\n",(numberOfBands==3?6:5), numberOfColumns, numberOfRows);

fwrite(image,1,totalPixels,fpOut);}