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image processing

This is a discussion on image processing within the C Programming forums, part of the General Programming Boards category; Hey everyone. Iam trying to make a program using structs and pointers on arrays to analyze a bmp picture characteristics. ...

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    image processing

    Hey everyone. Iam trying to make a program using structs and pointers on arrays to analyze a bmp picture characteristics. Any good links to study?
    Thanks

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    So which bit(s) are confusing you?
    - structs and arrays in C
    - the details of the BMP file format
    - image processing techniques in general
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    well iam trying to make the basic struct so i can build on it the rest of the program. I have read the bmp header file format but i can't really understand the difference between the file size and the raw file size

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    Where is this the raw file size? AFAIK there is a file size and an offset to the bitmap. But you can investigate the header of some real bmp files to confirm how the data is laid out.

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    Yes i am aware of those two sizes. But the size of the raw bitmap data is the one i don't understand.

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    The size of the bitmap data would be, (file size - header size) the actual image data. But look at a real bmp file it's easy to confirm this.

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    yeap that's it!!
    thank you very much Subsonics

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    Well so far so good.. i have build the structs for header and data now the problem is how do i read the data in binary from a bmp picture i have?

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    Quote Originally Posted by antros48 View Post
    Well so far so good.. i have build the structs for header and data now the problem is how do i read the data in binary from a bmp picture i have?
    Read: File operations Tutorial.
    Quote Originally Posted by anduril462 View Post
    Now, please, for the love of all things good and holy, think about what you're doing! Don't just run around willy-nilly, coding like a drunk two-year-old....
    Quote Originally Posted by quzah View Post
    ..... Just don't be surprised when I say you aren't using standard C anymore, and as such,are off in your own little universe that I will completely disregard.
    Warning: Some or all of my posted code may be non-standard and as such should not be used and in no case looked at.

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    Thanks for the reply! But how about when i want to give the files to the program when i run the program .. can i use argv[] and set e.g. argv[1] = file??

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    Quote Originally Posted by antros48 View Post
    Thanks for the reply! But how about when i want to give the files to the program when i run the program .. can i use argv[] and set e.g. argv[1] = file??
    Yes, just like you would handle any other command line argument. If you need a refresher on the topic, you can look at How to access command line parameters-FAQ().

    Due not that since argv[1] is a char*, you would need to use strcpy() and not the assignment operator if you wanted to store it in another variable.
    Quote Originally Posted by anduril462 View Post
    Now, please, for the love of all things good and holy, think about what you're doing! Don't just run around willy-nilly, coding like a drunk two-year-old....
    Quote Originally Posted by quzah View Post
    ..... Just don't be surprised when I say you aren't using standard C anymore, and as such,are off in your own little universe that I will completely disregard.
    Warning: Some or all of my posted code may be non-standard and as such should not be used and in no case looked at.

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    Using argv for the file works, no problem.

    Code:
    FILE *fp = fopen(argv[1], "r");
    Something to think about, is how a pixel is represented and color depth. Then there might be padding at the end of each row to "even up" the number of bytes per row, but you will find that out soon enough.

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    Quote Originally Posted by Subsonics View Post
    Using argv for the file works, no problem.
    I never said it wouldn't.
    Quote Originally Posted by anduril462 View Post
    Now, please, for the love of all things good and holy, think about what you're doing! Don't just run around willy-nilly, coding like a drunk two-year-old....
    Quote Originally Posted by quzah View Post
    ..... Just don't be surprised when I say you aren't using standard C anymore, and as such,are off in your own little universe that I will completely disregard.
    Warning: Some or all of my posted code may be non-standard and as such should not be used and in no case looked at.

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    I never said you said it wouldn't.
    AndrewHunter likes this.

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    Quote Originally Posted by Subsonics View Post
    I never said you said it wouldn't.
    LOL......
    Quote Originally Posted by anduril462 View Post
    Now, please, for the love of all things good and holy, think about what you're doing! Don't just run around willy-nilly, coding like a drunk two-year-old....
    Quote Originally Posted by quzah View Post
    ..... Just don't be surprised when I say you aren't using standard C anymore, and as such,are off in your own little universe that I will completely disregard.
    Warning: Some or all of my posted code may be non-standard and as such should not be used and in no case looked at.

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