如何使用C＃脚本在Unity中将OpenCV Mat转换为Texture2D？

Question

I just want to convert Mat type variable to Texture2D type.

I can convert texture2D to mat and this only use EncodeToJPG() function. like this:

Mat mat = Mat.FromImageData(_texture.EncodeToPNG());

Texture2D -> Mat is easy...but I cannot convert "MAT -> Texture2D"

Answer 1

With opencvsharp, use Mat.GetArray to get the byte array data of the mat then loop over it based on the the height and width of the mat. Copy the mat data to Color32 in that loop and finally use Texture2D.SetPixels32() and Texture2D.Apply() to set and apply the pixel.

void MatToTexture(Mat sourceMat) 
{
    //Get the height and width of the Mat 
    int imgHeight = sourceMat.Height;
    int imgWidth = sourceMat.Width;

    byte[] matData = new byte[imgHeight * imgWidth];

    //Get the byte array and store in matData
    sourceMat.GetArray(0, 0, matData);
    //Create the Color array that will hold the pixels 
    Color32[] c = new Color32[imgHeight * imgWidth];

    //Get the pixel data from parallel loop
    Parallel.For(0, imgHeight, i => {
        for (var j = 0; j < imgWidth; j++) {
            byte vec = matData[j + i * imgWidth];
            var color32 = new Color32 {
                r = vec,
                g = vec,
                b = vec,
                a = 0
            };
            c[j + i * imgWidth] = color32;
        }
    });

    //Create Texture from the result
    Texture2D tex = new Texture2D(imgWidth, imgHeight, TextureFormat.RGBA32, true, true);
    tex.SetPixels32(c);
    tex.Apply();
}

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If you're not using opencvsharp but making the plugin yourself with C++ and C# then see this post.