京东商城图片价格识别

    因项目需要，花了点时间做了个小程序来演示京东商城的图片价格识别，初步试用效果还不错。

    先上个图：

 

用了个最简单的算法：

 

/// <summary>
        /// 图片解码
        /// </summary>
        /// <param name="srcBitmap">0-9和.的源图像</param>
        /// <param name="distBitmap">目标图像</param>
        /// <returns></returns>
        public static string DecodeGrayBitmap(IList<Bitmap> srcBitmap, Bitmap[] distBitmap)
        {
            StringBuilder sb = new StringBuilder();

            foreach (Bitmap dist in distBitmap)
            {
                int val = 0;
                double max = 0;

                for (int pos = 0; pos < srcBitmap.Count; pos++)
                {
                    double n = ClacMatchRate(srcBitmap[pos], dist);

                    if (n > max)
                    {
                        max = n;
                        val = pos;
                    }

                    if (max > 0.9)
                        break;
                }

                if (val == 10)
                {
                    sb.Append('.');
                }
                else
                {
                    sb.Append(val);
                }
            }

            return sb.ToString();
        }

        public static double ClacMatchRate(Bitmap src, Bitmap dist)
        {
            double black = 0;
            double match = 0;

            int w = src.Width < dist.Width ? src.Width : dist.Width, h = src.Height < dist.Height ? src.Height : dist.Height;

            for (int x = 0; x < w; x++)
            {
                for (int y = 0; y < h; y++)
                {
                    int sc = PixelGrayValue(src.GetPixel(x, y));
                    int dc = PixelGrayValue(dist.GetPixel(x, y));

                    if (sc == 0 || dc == 0)
                    {
                        black++;

                        if (sc == dc)
                            match++;
                    }
                }
            }

            return match / black;
        }