What is best practice for adding OpenCV as a dependency in a Julia Package?

Specific Domains Visualization
, ,
1

I went through the recipe online for building the Julia OpenCV bindings. It is all based on CxxWrap to automatically create the bindings. So I get something locally installed, but I cannot add OpenCV as a dependency to my packages:

pkg> add OpenCV
ERROR: The following package names could not be resolved:
* OpenCV (not found in project, manifest or registry)

Does anyone have any advice on how to best proceed? I could add a local path I suppose, but I cooperate with somebody else on this repo. I have contemplated looking into making a local registry, or exploring BinaryBuilder to see if I could wrap this up in a more proper Julia package that can be put on a GitHub repo. But I am thinking I cannot be the first one with this problem. What do other people using OpenCV in Julia currently do?

2

Yeah, all people that tried to build OpenCV with BinaryBuilder gave up. Seems to be complicated, as far as I understand, or maybe it needs too many dependencies not yet packaged?

3

Before you continue with the OpenCV attempt, just wanted to double check that you are aware of Images.jl? Is there a specific functionality from OpenCV that is not yet available in Images.jl?

4

I don’t know well what is in Images. It seems very generic what I have seen thus far. I specifically want to do stereo matching. OpenCV has this StereoBM class for that. First step is to compute a disparity map, which means taking two images of the same scene and finding how much the features are shifted left or right. This can then be later used to create a depth map.

If Images.jl can already do something like this, then I would be thrilled. Could you point me in the right direction? I am new to this domain, so it is not obvious to me what functions in Images.jl I may use for this.

5

Thanks, that potentially saved me a ton of wasted time. What would be best then? Just putting it all in a Docker container or something?

Also contemplate, maybe wrapping whatever I need in OpenCV in a C API as that is easy to call from Julia. But I guess that doesn’t help on the challenge of compiling OpenCV through Julia.

6

Unfortunately I am super busy here, but try to take a look at the JuliaImages organization, and try to contact the active maintainers in Zulip for example.

https://github.com/JuliaImages

1 Like
7

Thanks for the help!

8

In case someone wants to try again, this PR might be a good starting point. Most platforms were actually successful

1 Like