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    Code for reading Raster Data

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    'A project on Number plates; I have successfully implemented a
    method for character localisation, character segmentation and character

    Main problem at the moment is to find a method capable of reading
    raster data and print it to file. Have segmented characters into a 10x10
    pixels, 8-bit(Bitmap) black and white.
    It has been suggested that i should use a code developed by Bill Green
    (www.pages.drexel.edu/~weg22/colorBMP.html ) click on tutorial and raster
    data tutorial (8-bit).
    Have downloaded the code, made a few changes but could not
    unfortunately get the right answer.
    Have actually got some answers but when a compare for example the
    values for letter E from the program and the values of letter E with Photo
    shop, the result is not the same.

    If you could help, please let me know.

    Below is the code with little modification made.

    #include <stdio.h>
    #include <stdlib.h>
    #include <math.h>

    typedef struct {int rows; int cols; unsigned char* data;} sImage;

    long getImageInfo(FILE*, long, int);
    long copyImageInfo(FILE*, FILE*, int);
    long copyColorTable(FILE*, FILE*);

    int main(int argc, char* argvUnknown Variable:)
    FILE *bmpInput, *rasterOutput;
    sImage originalImage;
    unsigned char someChar;
    unsigned char* pChar;
    int nColors;
    long fileSize;
    int vectorSize, r, c;

    /* initialize pointer */
    someChar = '0';
    pChar = &someChar;

    // if(argc < 2)
    // {
    // printf("Usage: %s bmpInput.bmpn", argvUnknown Variable:0);
    // exit(0);

    argvUnknown Variable:1="LetterE.bmp";
    printf("Reading filename %sn", argvUnknown Variable:1);

    /*--------READ INPUT FILE------------*/
    bmpInput = fopen(argvUnknown Variable:1, "rb");
    fseek(bmpInput, 0L, SEEK_END);
    rasterOutput = fopen("LetterE.txt", "w");

    /*--------GET BMP DATA---------------*/
    originalImage.cols = (int)getImageInfo(bmpInput, 18, 4);
    originalImage.rows = (int)getImageInfo(bmpInput, 22, 4);
    fileSize = getImageInfo(bmpInput, 2, 4);
    nColors = getImageInfo(bmpInput, 46, 4);
    vectorSize = fileSize - (14 + 40 + 4*256);

    /*-------PRINT TO SCREEN-------------*/
    printf("Width: %dn", originalImage.cols);
    printf("Height: %dn", originalImage.rows);
    printf("File size: %ldn", fileSize);
    printf("# Colors: %dn", nColors);
    printf("Vector size: %dn", vectorSize);

    /*----------READ RASTER DATA---------*/
    fseek(bmpInput, (54 + 4*nColors), SEEK_SET);

    for(r=0; r<=originalImage.rows - 1; r++)
    for(c=0; c<=originalImage.cols - 1; c++)
    fread(pChar, sizeof(char), 1, bmpInput);
    fprintf(rasterOutput, "(%d, %d) = %dn", r, c, *pChar);



    /*----------GET IMAGE INFO SUBPROGRAM--------------*/
    long getImageInfo(FILE* inputFile, long offset, int numberOfChars)
    unsigned char *ptrC;
    long value = 0L;
    unsigned char dummy;
    int i;

    dummy = '0';
    ptrC = &dummy;

    fseek(inputFile, offset, SEEK_SET);

    for(i=1; i<=numberOfChars; i++)
    fread(ptrC, sizeof(char), 1, inputFile);
    /* calculate value based on adding bytes */
    value = (long)(value + (*ptrC)*(pow(256, (i-1))));

    } /* end of getImageInfo */

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    Solution Preview

    Dear student,
    As you have mentioned problem to be reading a raster file and printing data. I have attached the run C ...