Question

嘿，
我正在尝试从我的网络摄像头读取EAN-13条形码我已经写了一堂课来做这项工作我正在从我的网络摄像头拍照，修剪它只显示条形码，
并使用维基百科的代码表阅读条形码由于某种原因，条形码被修剪，但输出始终为“0-1-1-1-1-1-1-1-1-1-1-1-1”。
我想知道我是否犯了任何愚蠢的错误或误解了什么？

我不想使用任何第三方程序！

这是我现在的代码：

    public class BarcodeDecoder
{
    static string[] ligerade = new string[] { "0100111", "0110011", "0011011", "0100001", "0011101", "0000101", "0010001", "0001001", "0010111" };
    static string[] rechtsgerade = new string[ligerade.Length];
    static string[] liungerade = new string[ligerade.Length];
    static string[] GeradeUG = new string[] { "UUUUUU", "UUGUGG", "UUGGUG", "UUGGGU", "UGUUGG", "UGGUUG", "UGGGUU", "UGUGUG", "UGUGGU", "UGGUGU" };
    static int[] links;
    static int[] rechts;
    static string result;

    public static string Decode(Bitmap b)
    {
        result = "";
        Bitmap bb = CutOutOf(b, b.Height / 2);
        bb = trimBitmap(bb);
        int[] lgs = GetNumberOutOf(bb);
        int[][] rr = trimArray(lgs);
        links = rr[0];
        rechts = rr[1];
        FillArrays();
        BearbeiteLinks();
        BearbeiteRechts();
        return result;
    }
    static void BearbeiteLinks()
    {
        string GU = "";

        string[] zahlen = new string[6];
        zahlen[0] = OutOfArray(links, 0, 7);
        zahlen[1] = OutOfArray(links, 7, 7);
        zahlen[2] = OutOfArray(links, 14, 7);
        zahlen[3] = OutOfArray(links, 21, 7);
        zahlen[4] = OutOfArray(links, 28, 7);
        zahlen[5] = OutOfArray(links, 35, 7);

        foreach (string pq in zahlen)
        {
            bool gerade = ligerade.ToList().IndexOf(pq) > -1;
            if (gerade)
            {
                result += ligerade.ToList().IndexOf(pq).ToString();
                GU += "G";
            }
            else
            {
                result += liungerade.ToList().IndexOf(pq).ToString();
                GU += "U";
            }
        }
        result = GeradeUG.ToList().IndexOf(GU).ToString() + result;
    }
    static void BearbeiteRechts()
    {
        string[] zahlen = new string[6];
        zahlen[0] = OutOfArray(rechts, 0, 7);
        zahlen[1] = OutOfArray(rechts, 7, 7);
        zahlen[2] = OutOfArray(rechts, 14, 7);
        zahlen[3] = OutOfArray(rechts, 21, 7);
        zahlen[4] = OutOfArray(rechts, 28, 7);
        zahlen[5] = OutOfArray(rechts, 35, 7);

        foreach (string pq in zahlen)
        {
            result += rechtsgerade.ToList().IndexOf(pq).ToString();
        }
    }
    static string OutOfArray(int[] ar, int startindex, int length)
    {
        int[] gar = new int[length];
        Array.Copy(ar, startindex, gar, 0, length);
        StringBuilder bilder = new StringBuilder();
        for (int i = 0; i < gar.Length; i++)
        {
            bilder.Append(gar[i].ToString());
        }
        return bilder.ToString();
    }
    static Bitmap trimBitmap(Bitmap b)
    {
        bool alreadyBlack = false;
        int firstblack = 0;

        for (int i = 0; i < b.Width; i++)
        {
            Color gp = b.GetPixel(i, 0);
            if ((gp.R + gp.G + gp.B) / 3 < 128)
            {
                if (!alreadyBlack)
                {
                    alreadyBlack = true;
                    firstblack = i;
                }
            }
        }

        bool alreadyblack = false;
        int lastblack = 0;
        for (int i = b.Width -1; i > 0; i--)
        {
            Color gpp = b.GetPixel(i, 0);
            if ((gpp.R + gpp.G + gpp.B) / 3 < 128)
            {
                if (!alreadyblack)
                {
                    alreadyblack = true;
                    lastblack = i;
                }
            }
        }
        Bitmap result = new Bitmap(lastblack - firstblack, 1);
        for (int i = firstblack; i < lastblack; i++)
        {
            Color c = b.GetPixel(i, 0);
            result.SetPixel(i - firstblack, 0, c);
        }
        result.Save("C:\\result.bmp", System.Drawing.Imaging.ImageFormat.Bmp);
        return result;
    }
    static int[][] trimArray(int[] ar)
    {
        int[][] res = new int[2][];
        int[] resl = new int[6 * 7];
        int[] resr = new int[6 * 7];
        Array.Copy(ar, 2, resl, 0, 6 * 7);
        Array.Copy(ar, 2 + 6 * 7 + 5, resr, 0, 6 * 7);
        res[0] = resl;
        res[1] = resr;
        return res;
    }
    static void FillArrays()
    {
        for (int i = 0; i < ligerade.Length; i++)
        {
            rechtsgerade[i] = string.Concat(ligerade[i].Reverse());
        }
        for (int x = 0; x < liungerade.Length; x++)
        {
            liungerade[x] = Invert(rechtsgerade[x]);
        }
    }
    static string Invert(string xx)
    {
        string xs = "";
        for (int y = 0; y < xx.Length; y++)
        {
            int fd = int.Parse(xx[y].ToString());
            if (fd == 0)
                fd = 1;
            else
                fd = 0;
            xs += fd.ToString();
        }
        return xs;
    }
    static Bitmap CutOutOf(Bitmap b, int y)
    {
        Bitmap res = new Bitmap(b.Width, 1);

        for (int i = 0; i < b.Width; i++)
        {
            Color c = b.GetPixel(i, y);
            res.SetPixel(i, 0, c);
        }
        return res;
    }
    static int[] GetNumberOutOf(Bitmap bb)
    {
        List<int> intlst = new List<int>();
        float f = (float)bb.Width / 95.0f;
        float wd = f / 2.0f;
        for (float i = wd; i < bb.Width; i+=f)
        {
            Color c = bb.GetPixel((int)Math.Round(i,0), 0);
            intlst.Add(GetOutOfColor(c));
        }
        return intlst.ToArray();
    }
    static int GetOutOfColor(Color c)
    {
        if (c.A + c.B + c.R > 128 * 3)
        {
            return 0;
        }
        return 1;
    }
}

对不起代码中的德语名称！

Answer 1

我看到两个问题：

1）您只扫描图像的最顶部像素行（请参阅 GetPixel 的第二个参数）。您的条形码可能位于图像的中间，而不是顶部。

Color c = bb.GetPixel((int)Math.Round(i,0), 0);

2）您可以使用alpha分量将彩色像素转换为二进制值，而不是绿色分量。由于alpha分量可能总是255，所以除非你的像素非常暗，否则总是得到0。

if (c.A + c.B + c.R > 128 * 3)

用网络摄像头读取条形码

1 个答案: