[Haskell-cafe] Open CV or alternate image processing library for Haskell on windows?

Tue May 17 11:21:55 CEST 2011

Hi,

I have little knowledge about windows in general, but CV package requires
that you install
the opencv c-libraries. You will find them at
http://opencv.willowgarage.com/. Including
a windows distribution.

However, CV package has not been tried on windows, so there might or might
not
be trouble that way. If you run into that said trouble, write a ticket at
https://github.com/aleator/CV/issues and I can try to take a look

Kind regards,
 Ville

On 17 May 2011 07:34, Antoine Latter <aslatter at gmail.com> wrote:

> On Mon, May 16, 2011 at 10:47 PM, Gregory Guthrie <guthrie at mum.edu> wrote:
> > Below is the install result. It does claim that "You must install OpenCV
> (development packages) prior to installing this package."
> > I don't' see any Haskell /cabal opencv package, so am not sure what this
> means one has to do.
>
> The error isn't referring to a Haskell package - it is saying that it
> cannot find the libraries installed on your computer.
>
> Note the line "Missing C libraries: cv, highgui, cv, highgui". These
> are not referring to Haskell packages - they are referring to libcv
> and libhighgui, whatever those are.
>
> What sort of computer are you using?
>
> Antoine
>
> >
> > I am not familiar enough with the Haskell install and make environment to
> go hacking into it, I was hoping for a simple cabal install!
> >
> > Thanks for the note and pointers. I am a bit surprised at the lack of
> graphics and Image processing libraries. I found several for Unix/Linux
> only, and their installs on Windows fail.
> >
> > I also love Linux, but windows is the 93% market share, and our student
> labs are all windows. I am trying to advocate using FP in more of our
> undergraduate level courses, and thought this might be a good area; perhaps
> not.
> >
> > Are the two packages for Hopencv the two on the hackage page? It looked
> to me like only one was claimed to be current and mostly complete.
> > ---------------------------------------------------
> >
> > C:\Users\guthrie>cabal install hopencv
> > Resolving dependencies...
> > Configuring HOpenCV-0.1.2.2...
> > Warning: 'include-dirs: /usr/include/opencv' directory does not exist.
> > Warning: 'include-dirs: /usr/include/opencv' directory does not exist.
> > cabal: Missing dependencies on foreign libraries:
> > * Missing C libraries: cv, highgui, cv, highgui
> > This problem can usually be solved by installing the system packages that
> > provide these libraries (you may need the "-dev" versions). If the
> libraries
> > are already installed but in a non-standard location then you can use the
> > flags --extra-include-dirs= and --extra-lib-dirs= to specify where they
> are.
> > cabal: Error: some packages failed to install:
> > HOpenCV-0.1.2.2 failed during the configure step. The exception was:
> > ExitFailure 1
> >
> > C:\Users\guthrie>cabal install cv
> > Resolving dependencies...
> > Configuring unix-2.4.2.0...
> > cabal: The package has a './configure' script. This requires a Unix
> > compatibility toolchain such as MinGW+MSYS or Cygwin.
> > cabal: Error: some packages failed to install:
> > CV-0.3.0.1 depends on unix-2.4.2.0 which failed to install.
> > JYU-Utils-0.1.1.1 depends on unix-2.4.2.0 which failed to install.
> > unix-2.4.2.0 failed during the configure step. The exception was:
> > ExitFailure 1
> >
> > C:\Users\guthrie>cabal install highgui
> > cabal: There is no package named 'highgui'.
> > You may need to run 'cabal update' to get the latest list of available
> > packages.
> >
> > -------------------------------------------
> >> -----Original Message-----
> >> From: Casey McCann [mailto:syntaxglitch at gmail.com]
> >> Sent: Monday, May 16, 2011 1:18 PM
> >> To: Gregory Guthrie
> >> Cc: haskell-cafe at haskell.org
> >> Subject: Re: [Haskell-cafe] Open CV or alternate image processing
> library for Haskell on
> >> windows?
> >>
> >> On Mon, May 16, 2011 at 8:37 AM, Gregory Guthrie <guthrie at mum.edu>
> wrote:
> >> > I wanted to look into using Haskell for an introductory Image
> Processing class, but the main
> >> package used for such things (OpenCV) does not appear to be available
> for windows systems.
> >> >
> >> > Is there some other good option for image processing in Haskell, or
> has anyone ported
> >> openCV to a windows Leksah environment?
> >>
> >> Which package are you having difficulty with? OpenCV is a library
> written in C/C++ and
> >> appears to work on Windows, and there looks to be two different packages
> on Hackage
> >> providing bindings to it, neither of which seems to have any issues with
> Windows. One does
> >> rely on the unix package, but my understanding is that Cygwin is
> sufficient for that--not
> >> certain about the details, though. I haven't used any of these packages
> or OpenCV itself
> >> personally, so there may be further issues I'm not seeing, but I would
> guess that any
> >> difficulty you've encountered was a matter of build tools and system
> configuration, not the
> >> libraries themselves.
> >>
> >> I have found it necessary on multiple occasions to do manual tweaks and
> jury-rigging when
> >> installing FFI bindings from Hackage on Windows, as opposed to the
> typically seamless
> >> process of installing an external library from standard repositories on
> Ubuntu and then
> >> bindings from Hackage. Admittedly this may be due in large part to the
> horrendous condition
> >> of build tools on my Windows system. I believe I have two different GHCs
> and no less than
> >> four copies of GCC in different locations and I've given up on making
> sense of it since I'm
> >> rarely on my Windows machine when coding Haskell anyway.
> >>
> >> Incidentally, have you looked at what functionality the bindings
> packages offer? Both that I
> >> saw on Hackage seem to advertise themselves as emphatically not
> production-ready code and
> >> probably don't expose all the features of OpenCV. Before you put a lot
> of time into fixing
> >> build problems, you may want to verify that they even provide what you
> need. As a last
> >> resort, writing your own Haskell FFI bindings to a C library is
> sometimes tedious but not
> >> usually difficult, and there are tools to help automate the task.
> >>
> >> I'm not aware of any other existing packages in Haskell for image
> processing or computer
> >> vision. Depending on what you need, you could write FFI bindings (to
> OpenCV or something
> >> else) or, if you mostly want to work with raw data instead of using
> algorithms provided by the
> >> library, there was actually a question on Stack Overflow recently that
> may be relevant:
> >> http://stackoverflow.com/questions/6006304
> >>
> >> - C.
> >
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