MacOS runtime error (Unable to load shared library 'OpenCvSharpExtern' or one of its dependencies)

Summary of your issue

Hi I tried use OpenCVSharp in my MacOS F# project. I added OpenCvSharp4.runtime.osx.10-15-x64 in my solution

Environment

MacOS 10.15.4, Visual Studio for Mac 8.5.6 (build 11)

Example code:

open OpenCvSharp

open System

[<EntryPoint>]
let main argv =
    let src = new Mat("cat.jpg", ImreadModes.Grayscale); // <<----- Exception is here
    // Mat src = Cv2.ImRead("lenna.png", ImreadModes.Grayscale);
    let dst = new Mat();

    let in1 = InputArray.Create(src)
    let in2 = OutputArray.Create(dst)

    Cv2.Canny(in1, in2, 50., 200.);
    use w1 = new Window("src image", src)
    use w2 = new Window("dst image", dst)

    Cv2.WaitKey() |> ignore

    0 // return an integer exit code

Output:

"Unable to load shared library 'OpenCvSharpExtern' or one of its dependencies. In order to help diagnose loading problems, consider setting the DYLD_PRINT_LIBRARIES environment variable: dlopen(libOpenCvSharpExtern, 1): image not found"

What did you intend to be?

[atkinsonbg]

@vlozhnikov @shimat Could we re-open this one? I’m having the same issue and am not able to resolve it.

My Environment: MacOS Big Sur 11.6, Visual Studio Code v1.63.2, Visual Studio for Mac 2022 Preview v17.0 Build 5186

I’ve tried the following:

• Installed OpenCV via Brew
• Per @vlozhnikov’s post I ran the following: brew install wget pkg-config mono-libgdiplus gtk+ ffmpeg glog yasm harfbuzz jpeg libpng libtiff openexr openjpeg metis openblas opencore-amr protobuf tbb webp
• Per @shimat’s comment, I copied the libOpenCvSharpExtern.dylib library to the root of the project
• Per @matthewrdev I’ve set that file to Content so it’s copied to the output during a build.
• Here is my current output folder during a debug session:

However, still getting the error:

Any other thoughts?

[ccaneke]

I’m also on MacOs with exactly the same symptoms described here, but I’ve been stuck on this error for a while.