Image Analysis / Processing.

[Guest_imported]

Hello All, I am looking for a wee bit of help concerning image processing.
Right now i am having trouble using some of the basic free/shareware image processing tools, such as the libtiff (tiff / tiffio) file types, or anything else of the like, which would eventually let me read a .tif file as a multidimensional array of numbers (the pics are gray scaled too, which makes life much easier). Once I get this array i'll be able to work my code out, but this first step is killing me! Any suggestions are welcome!

Thanks

 

[rbobbitt]

What are you having trouble with exactly? How to declare your multidimensional array? How to access its elements? How to use the library functions?

Maybe if you post a snippet of your code along with the specs for the library functions you're trying to use someone can help you.

Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts

 

[Basking]

Hi,
I remember doing this as my lab exercise in Digital Image processing Lab. If you post your snip may be we can help you.

Cheers,
Baskar.

Baskar
baskar52@hotmail.com

http://www.geocities.com/baskar52

 

[Guest_imported]

Like I said, this is the first hurdle towards solving my problem, so this code beginning is very basic. Here it is:

#include <stdio.h>
#include <tiff.h>
#include <tiffio.h>
#include <stdlib.h>
#include <ctype.h>
#define TIFFGetR(abgr) ((abgr) & 0xff)
#define TIFFGetG(abgr) (((abgr) >> 8) & 0xff)
#define TIFFGetB(abgr) (((abgr) >> 16) & 0xff)
#define TIFFGetA(abgr) (((abgr) >> 24) & 0xff)

FILE tif;


int main()
{
TIFF* tif = TIFFOpen(&quot;exp.tif&quot;, &quot;r&quot;
if (tif == NULL) {
fprintf(stderr, &quot;Cannot open exp.tif.\n&quot;
exit (8);
}
else {
int TIFFReadRGBAImage(TIFF* tif, u_long width, u_long height,
u_long* raster, int stopOnError);
}
TIFFClose(tif);

system(&quot;PAUSE&quot;
return 0;
}

Now, this is textbook coding, but I get the following errors when I try to compile it (well, not errors really, bloodshed says that the program compiled, but if you go to &quot;compiler results&quot; this is what it says.):

c:\windows\TEMP\ccdXtcgb.o(.text+0x41):tiff.c: undefined reference to `TIFFOpen'
c:\windows\TEMP\ccdXtcgb.o(.text+0x88):tiff.c: undefined reference to `TIFFClose'

All the libraries are in the correct location (? I think at least, the complier would otherwise give me an error to an unknown library file, and i made sure that the library file was being read by bloodshed (my compliler)), so I can't understand why the code fails to be capable of opening the tiff file.
Any help is much appreciated.
Also, any ideas on how to make a spread sheet of the pixil values (grey-scaled) would be excellent.

Thanks

 

[Nosferatu]

Well, i think you have a problem with the headers :
<stdio.h> is a &quot;system&quot; header. Somehow i dont' think that tiff.h and tiffio.h are system headers.
Try including them as

#include "tiff.h"
#include "tiffio.h"