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.
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
