Threshold.cs

namespace IdApp.Cv.Transformations.Thresholds
{
    public static partial class TransformationOperations
    {
        public static void Threshold(this Matrix<float> M, float Threshold)
        {
            if (Threshold < 0)
                M.Threshold(float.MinValue, -Threshold);
            else
                M.Threshold(Threshold, float.MaxValue);
        }
 
        public static void Threshold(this Matrix<float> M, float Min, float Max)
        {
            int y, h = M.Height;
            int x, w = M.Width;
            int Index = M.Start;
            int Skip = M.Skip;
            float[] Data = M.Data;
            float v;
 
            if (Min <= Max)
            {
                for (y = 0; y < h; y++, Index += Skip)
                {
                    for (x = 0; x < w; x++)
                    {
                        v = Data[Index];
                        Data[Index++] = v >= Min && v <= Max ? 1 : 0;
                    }
                }
            }
            else
            {
                for (y = 0; y < h; y++, Index += Skip)
                {
                    for (x = 0; x < w; x++)
                    {
                        v = Data[Index];
                        Data[Index++] = v >= Min || v <= Max ? 1 : 0;
                    }
                }
            }
        }
 
        public static void Threshold(this Matrix<int> M, int Threshold)
        {
            if (Threshold < 0)
                M.Threshold(int.MinValue, -Threshold);
            else
                M.Threshold(Threshold, int.MaxValue);
        }
 
        public static void Threshold(this Matrix<int> M, int Min, int Max)
        {
            int y, h = M.Height;
            int x, w = M.Width;
            int Index = M.Start;
            int Skip = M.Skip;
            int[] Data = M.Data;
            int v;
 
            if (Min <= Max)
            {
                for (y = 0; y < h; y++, Index += Skip)
                {
                    for (x = 0; x < w; x++)
                    {
                        v = Data[Index];
                        Data[Index++] = v >= Min && v <= Max ? 0x01000000 : 0;
                    }
                }
            }
            else
            {
                for (y = 0; y < h; y++, Index += Skip)
                {
                    for (x = 0; x < w; x++)
                    {
                        v = Data[Index];
                        Data[Index++] = v >= Min || v <= Max ? 0x01000000 : 0;
                    }
                }
            }
        }
 
    }
}