On Mon, May 16, 2011 at 10:47 PM, Gregory Guthrie <guth...@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:syntaxgli...@gmail.com] >> Sent: Monday, May 16, 2011 1:18 PM >> To: Gregory Guthrie >> Cc: haskell-cafe@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 <guth...@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. > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe