C# – unified Android Application Based on native opencv

I have a little question. I hope you can solve it

I want to create an Android Application in a unified way. The application includes activating the camera of the device and viewing it on the screen. For this purpose, I want to use the native C code based on OpenCV

I have the generated code, but when I run the application, I see the scene instead of the image. I think this is because I don't use the videocapture function of OpenCV well. Can you help me? I attach the code:

C ：

__declspec(dllexport) void iniciar(int& widt, int& heigh) {
camera.open(0);
if (!camera.isOpened())
{
    return;
}
widt = (int)camera.get(CV_CAP_PROP_FRAME_WIDTH);
heigh = (int)camera.get(CV_CAP_PROP_FRAME_HEIGHT);
trueRect.x = 5;
trueRect.y = 5;
trueRect.width = 100;
trueRect.height = 100;
midX = 1;
midY = 1;
wi = 0;
he = 0;
}


__declspec(dllexport)
void video(unsigned char* arr) {
Mat frame;
Mat resi;
Mat dst;//dst image
camera >> frame;
if (frame.empty()) {
    return;
}
flip(frame, dst,1);
//resize(dst, resi, Size(width, height));
cv::cvtColor(dst, dst, COLOR_BGR2RGB);
copy(dst.datastart, dst.dataend, arr);
}

C#：

public class camara : MonoBehavIoUr {

[DllImport("NativoPrincipio")]
public static extern void video(byte[] img);

[DllImport("NativoPrincipio")]
public static extern void iniciar(ref int widt, ref int heigh);

WebCamTexture back;
Texture2D textura;
byte[] imgData;
int width = 0;
int height = 0;


// Use this for initialization
void Start () {
    back = new WebCamTexture();
    //GetComponent<Renderer>().material.mainTexture = back;
    //back.Play();
    iniciar(ref width, ref height);
}

// Update is called once per frame
void Update ()
{
    imgData = new byte[width * height * 4];
    video(imgData);
    textura = new Texture2D(width, height, TextureFormat.RGB24, false);
    textura.LoadRawTextureData(imgData);
    textura.Apply();
    GetComponent<Renderer>().material.mainTexture = textura;
    imgData = null;
    textura = null;

}}

resolvent:

It might be better if you already hosted the entire code on GitHub, or if you could create a point

But I think your camera frame is empty

I'll try to enumerate why this happened

>First, the opencv video capture class camera. Open (0) does not work without ffmpeg (it is not easy to cross compile for Android native)

>If you want to use the native camera in C in Android, you need to use the latest NDK of API 24

>I see you are using unity's webcamtexture class, but it is almost possible that the captured texture is empty, so you will see a black screen in the image

Are you trying to search the unity plug-in for opencv? The only thing I see is this (not free): https://www.assetstore.unity3d.com/en/# !/ content/21088

If this doesn't work, is there any way you can paste the Java code of the unified project? Because the camera capture in Java is very easy. I hope these clues can help you

Ondo izan eta animo.

Drooping hair