Re: [Haskell-cafe] [ANN] New OpenCV Bindings

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 start. On Sat, Sep 28, 2013 at 2:23 PM, Ivan Perez 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 wrote:

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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@gmail.com> wrote:

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I think they do work. cv-combinators depends on HOpenCV, which depends on OpenCV 2.0.

On 28 September 2013 16:03, Arjun Comar wrote:

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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" wrote:

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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 wrote:

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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 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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