How can I get and set pixel values of an EmguCV Mat image?

Question

I\'m using the EmguCV 3.0.0 wrapper to the OpenCV 3.0 library. I\'m using the Mat class in a few places. Here\'s an example of a single channel, 8x8 image mad

Answer 1

Based on the Bartosz Rachwal's great answer, I've tried to write it for OpenCvSharp:

    public static dynamic GetValue(this Mat mat, int row, int col)
    {
        var value = CreateElement(mat.Type());
        Marshal.Copy(mat.Data + (row * mat.Cols + col) * mat.ElemSize(), value, 0, 1);
        return value[0];
    }
    public static void SetValue(this Mat mat, int row, int col, dynamic value)
    {
        var target = CreateElement(mat.Type(), value);
        Marshal.Copy(target, 0, mat.Data + (row * mat.Cols + col) * mat.ElemSize(), 1);
    }
    private static dynamic CreateElement(MatType depthType, dynamic value)
    {
        var element = CreateElement(depthType);
        element[0] = value;
        return element;
    }
    private static dynamic CreateElement(MatType depthType)
    {
        switch (depthType)
        {
            case MatType.CV_8S:
                return new sbyte[1];
            case MatType.CV_8U:
                return new byte[1];
            case MatType.CV_16S:
                return new short[1];
            case MatType.CV_16U:
                return new ushort[1];
            case MatType.CV_32S:
                return new int[1];
            case MatType.CV_32F:
                return new float[1];
            case MatType.CV_64F:
                return new double[1];
            default:
                throw new NotImplementedException();
        }
    }