C# 图像二值化

输入原图和二值化阀值对图像进行二值化

/// <summary>
/// 图像二值化
/// </summary>
/// <param name="original">原图</param>
/// <param name="threshold">阀值</param>
/// <returns></returns>
public static Bitmap ImageBinaryzation(Bitmap original,int threshold)
{
    Bitmap output = new Bitmap(original.Width, original.Height);
    for (int i = 0; i < original.Width; i++)
    {
        for (int j = 0; j < original.Height; j++)
        {
            Color c = original.GetPixel(i, j);
            int average = ((c.R + c.B + c.G) / 3);
            if (average > threshold)
                output.SetPixel(i, j, Color.Black);
            else
                output.SetPixel(i, j, Color.White);
        }
    }
    return output;
}