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image statistics

by vacant (Pilgrim)
on Dec 04, 2004 at 03:28 UTC ( #412339=perlquestion: print w/replies, xml ) Need Help??

vacant has asked for the wisdom of the Perl Monks concerning the following question:

Your humble servant begs the Learned Monks to cast a pearl or two in answer to the following:

My current project requires collecting a few standard statistical values about the pixels in an image. Typical values are the mean, average, mode, and variation of the population of pixels in a particular region of the image, such as the whole image, the border, the center region, and so on.

I have done most of the needed calculations by converting the image to a ".txt" format with ImageMagick and operating on the resulting text file. It seems likely there is a more efficient way to do this, but I have not been able to find (or, maybe, understand) a better already-invented method. Is there a Perl module that can handle an image as a complex array of integer values? Is there some better way of using ImageMagick for this? Also, is there a Perl module that can do standard statistical operations on a three-dimensional matrix?

Best regards

Replies are listed 'Best First'.
Re: image statistics
by Fletch (Bishop) on Dec 04, 2004 at 03:37 UTC

    You might can get PDL to do what you want as far as multi-dimensional arrays, but it's probably going to take some conversions with ImageMagick to get things into a format that PDL will understand.

      You don't need ImageMagick; the supplied NetPBM interface in PDL::IO::Pic should be able to do anything ImageMagick can.
Re: image statistics
by dondelelcaro (Monk) on Dec 04, 2004 at 05:49 UTC
    Is there a Perl module that can handle an image as a complex array of integer values? Is there some better way of using ImageMagick for this?
    Assuming the image you're using is supported by imlib2, you're probably better off using Image::Imlib2 and it's query_pixel function.

    As far as statistics go, PDL is a common choice, or you could use Statistics::Basic or go even more complex, and send the data to R.

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