RE: [boost] VIGRA - Image processing for boost

From: Karl MacMillan (karlmac_at_[hidden])
Date: 2001-11-14 09:22:43

> -----Original Message-----
> From: Michiel Salters [mailto:Michiel.Salters_at_[hidden]]
> Sent: Wednesday, November 14, 2001 5:38 AM
> To: 'boost_at_[hidden]'
> Subject: RE: [boost] VIGRA - Image processing for boost
>
>
> Not bad at all.
>
> I do think we should have a good review, from a C++ point of view. E.g.
> Having
> members "Iterator" instead of "iterator" doesn' t affect the image
> processing part,
> but it makes it a bit harder to treat an image as just another container.
>

I think this is definitely true. The ability to use standard algorithms on
the image containers and use other image containers with the image
processing algorithms seems very important to me.

> Having worked in the Image Processing group at Delft University,
> I know from
> experience
> that having operator+ on images is liked very much; having to
> write (in C)
> AddImg( &img1, &img2, &img_dest ) was seen as a bad thing. Those people
> won't like
> having to use std::transform and std::plus.
>

It is certainly true that people are resistent to the standard C++ style,
but I think that the benifits are clear and anyone that tacks the time to
really approach the C++ standard library (and Boost) with an open mind will
find it powerful. An interface that focuses on iterators is going to provide
a lot more functionality and the container based interface (including
operator overloading) can be layered on top of that for those that want.

> In the list of common image types, perhaps the most common pixel type is
> missing: bool.
> However, given the annoyance caused by std::vector<bool>, this is
> a type we
> should give
> proper attention. Here I can't come up with an easy fix.
>

Do you mean a bit-packed bi-level image? This is definitely something to be
wary of. I work with bi-level images almost exclusively, but never use a
bit-packed format. For document analysis it is very convenient to be able to
do connected-component labeling directly in the image, which means pixel
types that can hold more than two values.

Karl

Karl MacMillan
Computer Music Department
Peabody Institute of Johns Hopkins University
karlmac_at_[hidden] | 410-659-4440
mambo.peabody.jhu.edu/~karlmac

> Regards.
> Michiel
>
> > -----Original Message-----
> > From: Ullrich Koethe [mailto:u.koethe_at_[hidden]]
> > Sent: Tuesday, November 13, 2001 12:11 PM
> > To: boost_at_[hidden]
> > Subject: [boost] VIGRA - Image processing for boost
> >
> >
> > Hi,
> >
> > as the maintainer of the VIGRA library, I'd like to submit VIGRA for
> > inclusion into boost. VIGRA stands for '(Computer) Vision with GeneRic
> > Algorithms'. It is the first library (AFAIK) that consequently applies
> > the principles of the STL to the field of image processing
> > and analysis.
> > Please take a look at
> >
> >      http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/
> >
> > Features of VIGRA include:
> > * fully generic design
> > * extensive documentation
> > * liberal license
> > * templated image data structures, image transformations, filters etc.
> > * import/export of many image file formats (partly by using external
> > libraries such as libtiff and libjpeg)
> > * support for several color spaces
> > * image analysis functions (edge detection, connected components
> > labeling etc.)
> > * Python interface based on boost.python (not yet in the public
> > distribution)
> >
> > Please let me know what you think.
> >
> > Regards
> > Ulli
> > --
> >  ________________________________________________________________
> > |                                                                |
> > | Ullrich Koethe  Universität Hamburg / University of Hamburg    |
> > |                 FB Informatik / Dept. of Computer Science      |
> > |                 AB Kognitive Systeme / Cognitive Systems Group |
> > |                                                                |
> > | Phone: [phone]                Vogt-Koelln-Str. 30 |
> > | Fax:   [phone]                D - 22527 Hamburg   |
> > | Email: u.koethe_at_[hidden]               Germany             |
> > |        koethe_at_[hidden]                        |
> > | WWW:   http://kogs-www.informatik.uni-hamburg.de/~koethe/      |
> > |________________________________________________________________|
> >
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