OpenCv
OpenCv NIF Bindings for Erlang/Elixir.
Current status
Currently almost nothing works. Opening a video device and capturing jpeg frames works currently.
Usage
Capturing a jpeg encoded frame frame can be done by:
Interactive Elixir (1.7.3) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> {:ok, conn} = OpenCv.new()
{:ok, #Reference<0.1511271170.1095630852.139975>}
iex(2)> {:ok, cap} = OpenCv.VideoCapture.open(conn, '/dev/video0')
{:ok, #Reference<0.1511271170.1095630848.138924>}
iex(3)> true = OpenCv.VideoCapture.is_opened(conn, cap)
true
iex(4)> {:ok, frame} = OpenCv.VideoCapture.read(conn, cap)
{:ok, #Reference<0.1511271170.1095630848.138925>}
iex(5)> jpg = OpenCv.imencode(conn, frame, '.jpg', [])
<<255, 216, 255, 224, 0, 16, 74, 70, 73, 70, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 255,
219, 0, 67, 0, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 2, 2, 2, 4, 3, 2, 2, 2, 2,
5, 4, 4, 3, ...>>
iex(6)> File.write("img.jpg", jpg)
:okBuilding
This currently supports opencv3 and opencv4. It may support opencv2, but I have not tested. Nerves builds are currently supported given you have a system that has opencv installed. this system has opencv 3 installed. I've only tested build on linux, and it is likely that paths for the Makefile may be wrong.
Installation
To pull in this package directly from GitHub, amend your list of
dependencies in mix.exs as follows:
def deps do
[
{:open_cv, github: "ConnorRigby/elixir-opencv", branch: "master"}
]
endIf available in Hex, the package can be installed
by adding open_cv to your list of dependencies in mix.exs:
def deps do
[
{:open_cv, "~> 0.1.0"}
]
endDocumentation can be generated with ExDoc and published on HexDocs. Once published, the docs can be found at https://hexdocs.pm/open_cv.