On Monday, 21 March 2016 at 19:16:16 UTC, wobbles wrote:
On Monday, 21 March 2016 at 16:01:59 UTC, Guillaume Piolat
wrote:
On Monday, 21 March 2016 at 15:45:36 UTC, wobbles wrote:
Hi Folks,
I have a project in mind that I'd like to run on my new
Raspberry Pi 3.
Essentially a security camera that will only record when it
detects changes between frames.
Now, this is already a solved problem I believe, however in
the interest of learning I want to do it myself.
Ideally, I'd compare two images using the OpenCV library, and
ideally I'd do that from D code.
However, there exists no OpenCV binding for D that I can
find. Is there a technical reason for this?
I understand the OpenCV C api is quite old and dated, and
it's recommended to use the C++ one as a result.
On that, where is C++ / D linkage at?
I know very little about linking the two, but it's something
I'd like to learn more about and see this as an opportunity
for that - before I sink a load of time into it, however,
it'd be good to know if it's even feasibly possible to do so.
Thanks!
It's quite easy to write bindings for libraries that have a C
interface (ie most), if only a bit boring.
That's the thing, it doesn't have a C interface (or more
correctly, it's modern versions don't have a C interface as it
has been deprecated since I think version 2.4. OpenCV is at 3.4
now).
I was wondering if there was any difficulties interfacing D to
the C++ API?
I don't have much experience with D, but I have with OpenCV. The
key class in OpenCV is cv::Mat, which is used to represent images
as arguments and return values of almost every OpenCV algorithm.
It is kind of a handle class - it optionally owns image data and
manages its lifetime through reference counting and RAII. The
sheer number of constructors is a bit overwhelming.
See
http://docs.opencv.org/2.4/modules/core/doc/basic_structures.html#mat-mat
I would be interested to see what D experts would say about
interfacing such class.
My guess would be that you may have trouble exposing this
directly to the D side in a useful way. You may have to write
some helpers or even a wrapper on the C++ side.
