/// <summary>
        /// 获取验证码图片的baseline和meanline在X轴上的坐标
        /// </summary>
        public static void GetGuidePoint()
        {
            int[] pointArray = new int[ImgBoundary.rightUpPoint.Y];          
			
			int i = 0, j = 0;

            //找到每一列从字符底部到字符顶部遇到的第一个字符像素的X坐标值
            for (j = ImgBoundary.leftDownPoint.Y; j < ImgBoundary.rightUpPoint.Y; j++)
            {
                pointArray[j] = 0;

                for (i = ImgBoundary.rightUpPoint.X; i > ImgBoundary.leftDownPoint.X; i--)
                {
                    if (0 == BinaryArray[i,j])
                    {
                        pointArray[j] = i;
                        break;
                    }
                }
            }

            //找出上述X坐标值中数量最多的X值作为baseline
            Int32[] Histogram = new Int32[ImgBoundary.rightUpPoint.Y];
            Array.Clear(Histogram, 0, ImgBoundary.rightUpPoint.Y);     
            foreach (Int32 b in pointArray)
            {
                if(b != 0)
                {
                    Histogram[b]++;                
                }
            }
            
            //根据研究对象的特征,高于baseline三个像素以上的区域才会被认为是在baseline以下区域,因此将得到的坐标值+3个像素点作为baseline的值
            GuidePoint.X = Array.IndexOf(Histogram, Histogram.Max());// +3;

            //找到每一列从字符顶部到字符底部遇到的第一个字符像素的X坐标值
            for (j = ImgBoundary.leftDownPoint.Y; j < ImgBoundary.rightUpPoint.Y; j++)
            {
                pointArray[j] = 0;

                for (i = ImgBoundary.leftDownPoint.X; i < ImgBoundary.rightUpPoint.X; i++)
                {
                    if (0 == BinaryArray[i,j])
                    {
                        pointArray[j] = i;
                        break;
                    }
                }
            }

            //找到上述X值中数量最多的点作为meanline的参考点
            Array.Clear(Histogram, 0, ImgBoundary.rightUpPoint.X);     // 初始化
			
            foreach (Int32 b in pointArray)
            {
                if(b != 0)
                {
                    Histogram[b]++;                 // 统计直方图
                }
            }

            //小于meanline 2个像素的会被认为是meanline以上的区域,故直接将meanline减2个像素
            Int32 midValIndex = Array.IndexOf(Histogram, Histogram.Max());

            int tmpVal = ImgBoundary.leftDownPoint.X + (ImgBoundary.rightUpPoint.X - ImgBoundary.leftDownPoint.X) / 5;

            //防止meanline以上没有有效像素,故并不直接以计算值作为guidePoint		
			if(midValIndex > tmpVal)
			{
				GuidePoint.Y = midValIndex;
			}
			else
			{
				GuidePoint.Y = tmpVal;
			}
        }