Solved

Image processing

Posted on 2004-04-10
6
222 Views
Last Modified: 2010-04-17
How do I  read image which is stored in the pgmor binary file?  Complete code is requested such as file operations and call from main() function!!!!!!!!!!!!!
0
Comment
Question by:learncpp
  • 3
6 Comments
 
LVL 44

Expert Comment

by:Karl Heinz Kremer
ID: 10802187
I am not familiar with the pgmor format. Do you mean PGM format?
0
 

Author Comment

by:learncpp
ID: 10802228
Yes I meant PGM format.
0
 
LVL 44

Accepted Solution

by:
Karl Heinz Kremer earned 100 total points
ID: 10802571
You need the netpbm package for this (you can find this compiled for a number of architectures at http://netpbm.sourceforge.net/). Once you have this installed, you can use code like this:

#include "pgm.h"

int
main(int argc, char *argv[])
{
    int format;
    int rows, cols;
    gray maxval;
    int row;
    gray* grayrow;
    FILE * input;

    pgm_init(&argc, argv);

    if (argc != 2)
        pm_error("Usage:\n%s <pgm file>\n\n", argv[0]);

    input = fopen(argv[1], "r");
    if (input == NULL)
    {
        pm_error("Cannot open file %s\n", argv[1]);
        exit(-1);
    }

    pgm_readpgminit(input, &cols, &rows, &maxval, &format);
    grayrow = pgm_allocrow(cols);
    for (row = 0; row < rows; row++)
    {
        pgm_readpgmrow(input, grayrow, cols, maxval, format);
        // do something with the data in grayrow, the next read operation will overwrite this again.
    }
    pgm_freerow(grayrow);
    pm_close(input);

    exit(0);
}

You can also implement the read function yourself by implementing this format spec:
http://netpbm.sourceforge.net/doc/pgm.html
0
 
LVL 44

Expert Comment

by:Karl Heinz Kremer
ID: 10941275
Can you please explain the "C" grade. The provided sample program did either answer your question, or it did not. In the latter case, you should have asked for more information. If the sample did answer your question I don't understand your grading.
Please make yourself familiar with the EE grading guidelines at http://www.experts-exchange.com/Programming/help.jsp#hi73
I'll request a review of this grade.
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Eclipse Neon start with Admin account only 6 119
C Programming - If Statement 8 76
C# code editing and collaboration 3 110
draw a Christmas tree by using a nested loop? 26 60
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
This article will inform Clients about common and important expectations from the freelancers (Experts) who are looking at your Gig.
An introduction to basic programming syntax in Java by creating a simple program. Viewers can follow the tutorial as they create their first class in Java. Definitions and explanations about each element are given to help prepare viewers for future …
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

816 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now