[Haskell-cafe] [ANN] New OpenCV Bindings

Arjun Comar nrujac at gmail.com
Sat Sep 28 20:31:51 CEST 2013

I've been talking to Anthony Cowley who I think is the current maintainer
of HOpenCV and Ville Tirronen who has been developing the CV bindings.
Basically the consensus is that these raw bindings provide a new base to
work from, and it's worthwhile to rethink the API we provide with a fresh

On Sat, Sep 28, 2013 at 2:23 PM, Ivan Perez <ivanperezdominguez at gmail.com>wrote:

> The people working on HOpenCV are very open to incorporating other's
> programmer's patches. Maybe you can incorporate your changes to
> cv-combinators? (Project's been halted since 2010, I'm sure they'll be very
> happy to see that sb is contributing).
> On 28 September 2013 19:13, Arjun Comar <nrujac at gmail.com> wrote:
>> Fair enough, it's been two or three years since I tried to play with
>> them. Most of my work is in the raw bindings currently, which provide the
>> C++ API in Haskell, so much lower level that cv-combinators. If HOpenCV
>> were to incorporate parts of these bindings then cv-combinators would be
>> able to benefit from this work. That said, my effort going forward is to
>> provide something equivalent to cv-combinators in expressiveness. I'm
>> definitely taking inspiration from the library though I'm not basing my
>> work on their source code.
>> On Sat, Sep 28, 2013 at 12:51 PM, Ivan Perez <
>> ivanperezdominguez at gmail.com> wrote:
>>> I think they do work. cv-combinators depends on HOpenCV, which depends
>>> on OpenCV 2.0.
>>> On 28 September 2013 16:03, Arjun Comar <nrujac at gmail.com> wrote:
>>>> No, these are unrelated. Cv-combinators hasn't really worked since
>>>> OpenCV 2.0 waa released I believe.
>>>>  On Sep 28, 2013 8:54 AM, "Ivan Perez" <ivanperezdominguez at gmail.com>
>>>> wrote:
>>>>> Cool. Thanks a lot for uploading this.
>>>>> I have a question (and I confess that I haven't checked the link). How
>>>>> is this related to or overlaps with cv-combinators?
>>>>> Cheers
>>>>> Ivan
>>>>> On 28 September 2013 06:18, Arjun Comar <nrujac at gmail.com> wrote:
>>>>>> After receiving feedback, I went ahead and split out the raw C
>>>>>> wrappers and Haskell bindings. You can find them at
>>>>>> www.github.com/arjuncomar/opencv-raw. I'll upload it to hackage as
>>>>>> opencv-raw once I have uploader privileges.
>>>>>> Regards,
>>>>>> Arjun
>>>>>> On Fri, Sep 27, 2013 at 4:09 PM, Arjun Comar <nrujac at gmail.com>wrote:
>>>>>>> Hi all,
>>>>>>> I've been hard at work on a new set of OpenCV bindings that will
>>>>>>> hopefully solve a lot of the shortcomings with previous attempts. An
>>>>>>> automatic header parser has been used to generate a full set of Haskell
>>>>>>> bindings for the C++ API, and I'm now working to create a pleasant Haskell
>>>>>>> API. The plan is to expose major functionality through pipes for two
>>>>>>> reasons: 1) OpenCV is not very referentially transparent, and so you're
>>>>>>> stuck in IO for anything non-trivial. Lazy IO is potentially problematic,
>>>>>>> and so immediate incorporation of a proper streaming library is probably
>>>>>>> best. 2) Computer vision algorithms are frequently expressed in terms of
>>>>>>> pipelines of functionality, and a pipes approach can provide a very natural
>>>>>>> API for expressing these algorithms.
>>>>>>> At this stage, I could very much use input from anyone who's
>>>>>>> interested in these bindings. I've got the basics of a library forming, but
>>>>>>> there's a ton to do and help in the form of pull requests are very very
>>>>>>> welcome. I could also use feedback on what's been done so far (especially
>>>>>>> criticisms) as well as feature requests.
>>>>>>> The current plan is to develop the pipes API for the core
>>>>>>> functionality. The plan is to provide the major functionality from core,
>>>>>>> highgui, imgproc, features2d, contrib, ml, flann, video, and objdetect as
>>>>>>> quickly as I can before trying to cover any of the more specialized parts
>>>>>>> of the API. The functions and types from these modules (baring a few major
>>>>>>> and important exceptions) are automatically translated into C wrappers and
>>>>>>> raw Haskell bindings.
>>>>>>> If there's sufficient interest in these raw bindings separately from
>>>>>>> the API I'm developing, I'll release them as a separate package on Hackage.
>>>>>>> I'm calling my project revelation for the moment because I'm bad at naming
>>>>>>> things and it was the best pun I could come up with.
>>>>>>> Github: www.github.com/arjuncomar/revelation
>>>>>>> Regards,
>>>>>>> Arjun
>>>>>> _______________________________________________
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