Re: Computer Vision Library in D

[Ferhat Kurtulmuş via Digitalmars-d-announce]

On Tuesday, 19 April 2016 at 17:01:12 UTC, Relja Ljubobratovic 
wrote:

Hi everyone!

For a while I was looking for a computer vision library in D on 
the web, but haven't found any. There were few libraries I 
found, providing some basic image processing functionality, but 
none that could be remotely compared to opencv or other similar 
open source computer vision toolkits present for other 
languages. Surely for a year, even maybe two, this has been 
stopping me to switch completely to D from C/C++.


[...]


I know it is a little late but I have just started this project 
https://github.com/aferust/opencvd

Re: Computer Vision Library in D

[Michael via Digitalmars-d-announce]

On Thursday, 28 April 2016 at 11:50:55 UTC, Edwin van Leeuwen 
wrote:

On Thursday, 28 April 2016 at 11:32:25 UTC, Michael wrote:
And I would also like to see some more scientific libraries 
make it into D. Though I understand that including it in the 
standard library can cause issues, it would be nice to at 
least get some Linear Algebra libraries in experimental or 
over with the rest of the science libraries.


As I understand it that is part of the goal of mir:
https://code.dlang.org/packages/mir

Not sure if you were aware, but there is also a group with the 
aim to promote scientific dlang work:

https://gitter.im/DlangScience/public


I've seen the mir project and it looks promising. I'm also aware 
of Dlang science and I hope that it gains some support.

Re: Computer Vision Library in D

[Edwin van Leeuwen via Digitalmars-d-announce]

On Thursday, 28 April 2016 at 11:32:25 UTC, Michael wrote:
And I would also like to see some more scientific libraries 
make it into D. Though I understand that including it in the 
standard library can cause issues, it would be nice to at least 
get some Linear Algebra libraries in experimental or over with 
the rest of the science libraries.


As I understand it that is part of the goal of mir:
https://code.dlang.org/packages/mir

Not sure if you were aware, but there is also a group with the 
aim to promote scientific dlang work:

https://gitter.im/DlangScience/public

Re: Computer Vision Library in D

[Relja Ljubobratovic via Digitalmars-d-announce]

On Thursday, 21 April 2016 at 16:13:31 UTC, Bill Baxter wrote:
Fortran has some linear algebra functions in the standard 
library.  :-)
Java and many other modern languages are pretty much actively 
hostile to

doing numerical computation,
so including a linear algebra package in the standard library 
of those

languages would just highlight how bad they are at it.
C++ has a tradition of not having a standard library for 
anything you might
actually need to get work done, so I wouldn't follow their 
example.


--bb


Nice point about the Fortran, and also about the C++. :)

I'd have to say I'm convinced - if there's a vote about such 
module joining Phobos, count me in! :)


But really, when you look at it - the ndslice has made it to the 
Phobos, now it's probably natural to have some more extensive use 
of it in the standard library. Linear algebra stuff could be 
build nicely on top of the ndslice, you agree?

Re: Computer Vision Library in D

[Bill Baxter via Digitalmars-d-announce]

On Wed, Apr 20, 2016 at 9:26 PM, rikki cattermole via
Digitalmars-d-announce  wrote:

> On 20/04/2016 7:46 PM, Relja Ljubobratovic wrote:
>
>> On Wednesday, 20 April 2016 at 06:14:58 UTC, rikki cattermole wrote:
>>
>>> I was thinking std.math.linalg kinda seems like the right place once
>>> std.math is split up.
>>> There is an isolated one other than gfm.math. gl3n but I don't have
>>> permission to relicense to Boost. Its mostly ready unfortunately.
>>>
>>
>> I agree it sounds nice to have linalg package in the standard library.
>> Although I'm still not sure about it - I've never seen such package in
>> any other language's standard library. I'm not saying it's not right,
>> just a bit strange to me.
>>
>
Fortran has some linear algebra functions in the standard library.  :-)
Java and many other modern languages are pretty much actively hostile to
doing numerical computation,
so including a linear algebra package in the standard library of those
languages would just highlight how bad they are at it.
C++ has a tradition of not having a standard library for anything you might
actually need to get work done, so I wouldn't follow their example.

--bb

Re: Computer Vision Library in D

[rikki cattermole via Digitalmars-d-announce]

On 20/04/2016 7:46 PM, Relja Ljubobratovic wrote:

On Wednesday, 20 April 2016 at 06:14:58 UTC, rikki cattermole wrote:

I was thinking std.math.linalg kinda seems like the right place once
std.math is split up.
There is an isolated one other than gfm.math. gl3n but I don't have
permission to relicense to Boost. Its mostly ready unfortunately.


I agree it sounds nice to have linalg package in the standard library.
Although I'm still not sure about it - I've never seen such package in
any other language's standard library. I'm not saying it's not right,
just a bit strange to me.


I only need matrices and vectors in Phobos.
Whey do I want them? Simple.

I want windowing in Phobos. Which just so happens to have contexts such 
as OpenGL, Vulkan and DirectX.
Why does that matter? window.size * projMatrix is why. Making things 
just work without extra work.


And yes, Java does have a definition in its standard lib for Point which 
is what I need. Its just better to unify instead of separating it out.

Re: Computer Vision Library in D

[tchaloupka via Digitalmars-d-announce]

On Wednesday, 20 April 2016 at 19:53:27 UTC, Jacob Carlborg wrote:

On 2016-04-20 06:31, Relja Ljubobratovic wrote:

I've given this a lot of thought. I use OpenCV daily on the 
job, and I'm
very familiar with it. I too believe it would probably be 
smarter,
faster and safer to wrap its C interface with D, from the 
user's point

of view.


https://github.com/jacob-carlborg/dstep


Is it even safe to depend on currently unmaintained C interface?

http://answers.opencv.org/question/17546/opencv-will-drop-c-api-support-soon/

Re: Computer Vision Library in D

[Jacob Carlborg via Digitalmars-d-announce]

On 2016-04-20 06:31, Relja Ljubobratovic wrote:


I've given this a lot of thought. I use OpenCV daily on the job, and I'm
very familiar with it. I too believe it would probably be smarter,
faster and safer to wrap its C interface with D, from the user's point
of view.


https://github.com/jacob-carlborg/dstep

--
/Jacob Carlborg

Re: Computer Vision Library in D

[tost via Digitalmars-d-announce]

On Wednesday, 20 April 2016 at 07:43:01 UTC, Relja Ljubobratovic 
wrote:
Sound great! Although I'm far from implementing methods that 
use optimization techniques for dcv, I'll be sure to remember 
this. Maybe you should push the solution to github and have 
other people take a look?


hopefully at the weekend. I want to tidy up first...

Re: Computer Vision Library in D

[Relja Ljubobratovic via Digitalmars-d-announce]

On Wednesday, 20 April 2016 at 04:37:10 UTC, rikki cattermole 
wrote:

On the note of linear algebra.
Would you be willing to improve gfm:math (or start from scratch 
I don't really care too much) for Phobos inclusion?


Frankly, I didn't know about the gfm project - it seems nice! 
About the math module, I'm not really sure how (or where) it 
would fit into Phobos? Seems to me that such module really should 
be kept as a library. Isn't there a isolated 3D math library 
present in dub? Anyways, I'll look into it more closely when I 
find time!




Also how much do you know about color theory?
Manu really needs help to get his color work to support 
blending (its mostly time thing really) and that would really 
help since its meant for Phobos.


I've given it only a quick look just now, and it seems great! - 
I'll definitely look into it!

Re: Computer Vision Library in D

[Relja Ljubobratovic via Digitalmars-d-announce]

Hey guys, thank you all for responding!

Standard modules for color conversion already exists. See for 
instance


That's awesome, thanks! - I'll look into it!

Wouldn't it be easier to just write bindings to C interface of 
OpenCV, or make a thin D-style wrapper over that API, and use a 
proven widely supported computer vision library rather than try 
to reinvent the wheel?


I've given this a lot of thought. I use OpenCV daily on the job, 
and I'm very familiar with it. I too believe it would probably be 
smarter, faster and safer to wrap its C interface with D, from 
the user's point of view.
The reason why I chose not to do it is it's complexity - OpenCV 
has everything implemented/integrated inside - linear algebra, 
machine learning, optimization and all the other submodules that 
are needed for cv. In the dcv project, I'd really like to rely on 
third party libraries for such functionality - actualy I was 
encouraged and inspired to do it because of DlangScience guys. 
I'm hopping that scid and other such libraries would get a 
interface with ndslice in time, which is the reason I chose to 
use it as main array structure in the library. I believe (as many 
do I'm sure) that through the ndslice, D would get numeric 
ecosystem nice and well integrated as python, which I think would 
be a great success for the language.


So the long story short - we could build a opencv wrapper, but 
here I wanted to start building something that would more nicely 
fit with DlangScience and other D libraries.



You've got a bad @trusted here

Thanks - I'll fix it and try to learn bit more about @trusted!

I am happy to see that you use ndslice. We start to build 
numeric library for science and machine learning. SVM, which is 
used in CV is in out TODO list. You are welcome for feature 
request and for contributing.


Hey Ilya! The text above tells that I've been closely following 
your work, and that I hope ndslice plays important part in D's 
numeric future. I will of course watch the SVM and other such 
projects from you guys, and will contribute whenever I can - 
thanks a lot for your effort!


I'm interested in contributing towards parts that involve 
machine learning/numerical optimisation. I have written some of 
my own CV/ML programs with D in the past, but none of them are 
particularly well engineered since they were all intended for 
just my own use.


That's great, thanks Henry! As I've noted above, I think it would 
be wise to keep modules like ML and optimization apart from this 
library, and to integrate dcv with them through ndslice. Maybe 
it's more likely that you could contribute to DlangScience's SVM 
libray with those parts? But any of your previous CV experience 
is more than welcome for DCV - I'll contact you on the github so 
we could discuss this further, hope that's ok.

Re: Computer Vision Library in D

[rikki cattermole via Digitalmars-d-announce]

On the note of linear algebra.
Would you be willing to improve gfm:math (or start from scratch I don't 
really care too much) for Phobos inclusion?


Its one of the things I need for my work e.g. windowing + image.

Also how much do you know about color theory?
Manu really needs help to get his color work to support blending (its 
mostly time thing really) and that would really help since its meant for 
Phobos.

Re: Computer Vision Library in D

[Henry Gouk via Digitalmars-d-announce]

On Tuesday, 19 April 2016 at 17:01:12 UTC, Relja Ljubobratovic 
wrote:

Hi everyone!

For a while I was looking for a computer vision library in D on 
the web, but haven't found any. There were few libraries I 
found, providing some basic image processing functionality, but 
none that could be remotely compared to opencv or other similar 
open source computer vision toolkits present for other 
languages. Surely for a year, even maybe two, this has been 
stopping me to switch completely to D from C/C++.


[...]


I'm interested in contributing towards parts that involve machine 
learning/numerical optimisation. I have written some of my own 
CV/ML programs with D in the past, but none of them are 
particularly well engineered since they were all intended for 
just my own use.

Re: Computer Vision Library in D

[Ilya Yaroshenko via Digitalmars-d-announce]

On Tuesday, 19 April 2016 at 17:01:12 UTC, Relja Ljubobratovic 
wrote:

Hi everyone!

For a while I was looking for a computer vision library in D on 
the web, but haven't found any. There were few libraries I 
found, providing some basic image processing functionality, but 
none that could be remotely compared to opencv or other similar 
open source computer vision toolkits present for other 
languages. Surely for a year, even maybe two, this has been 
stopping me to switch completely to D from C/C++.


Anyhow, lately I've started working on such library [1]. The 
plan at first was to implement the most basic computer vision 
algorithms, on top of which other more complex algorithms could 
be built on. So far, I've mostly had experience with feature 
correspondence, optical flow and stereo vision, so those would 
probably be the first few modules I'd implement.


But I was really hopping to find other computer vision people 
in the D community, that would like the idea and help out. I'm 
not well experienced in D, and also It's fair to say that I'm 
not experienced well enough in computer vision area to take on 
an undertaking such as writing this library alone. So I feel 
it's evident that I'd need some help, to make this library 
usable to other computer vision scientists and engineers.


Is there anyone who would like to join me?

Cheers,
Relja

[1] https://github.com/ljubobratovicrelja/dcv


Hi Relja,

I am happy to see that you use ndslice. We start to build numeric 
library for science and machine learning. SVM, which is used in 
CV is in out TODO list. You are welcome for feature request and 
for contributing.


https://github.com/DlangScience/mir

Best regards,
Ilya

Re: Computer Vision Library in D

[ag0aep6g via Digitalmars-d-announce]

On 19.04.2016 19:01, Relja Ljubobratovic wrote:

[1] https://github.com/ljubobratovicrelja/dcv


You've got a bad @trusted here:

https://github.com/ljubobratovicrelja/dcv/blob/3b7e4908bfb535536f4b71862239ee071d22461d/source/dcv/core/algorithm.d#L23

You're trusting Range's empty, front, and popFront, but they may be 
unsafe. You're also trusting arbitrary code that's passed in via comparator.

Re: Computer Vision Library in D

[JN via Digitalmars-d-announce]

On Tuesday, 19 April 2016 at 17:01:12 UTC, Relja Ljubobratovic 
wrote:

Hi everyone!

For a while I was looking for a computer vision library in D on 
the web, but haven't found any. There were few libraries I 
found, providing some basic image processing functionality, but 
none that could be remotely compared to opencv or other similar 
open source computer vision toolkits present for other 
languages. Surely for a year, even maybe two, this has been 
stopping me to switch completely to D from C/C++.




OpenCV has a C interface. Wouldn't it be easier to just write 
bindings to C interface of OpenCV, or make a thin D-style wrapper 
over that API, and use a proven widely supported computer vision 
library rather than try to reinvent the wheel?