二维码识别？

2014-01-30 09:57:28 267 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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halcon二维码识别简单案例二维码类型，用halcon识别二维码的步骤及相关实例代码阅读详情

我向问一个难题，不知倒有没有人会。我要从摄像头中得到的照片（还有背景的）识别出二维码，用C#编，是不是很难？有没有思路启发我下。谢谢！

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第一篇：常见CAN错误帧及其排查方向在本文中主要阐述各类错误帧的形成原因以及在使用同星硬件设备出现错误帧时，应当如何进行排查并消除错误帧。在 CAN 总线通信中，通常遇见的错误帧主要为以下五种，其分别是：bit error、ACK error、stuff error、CRC error 以及 form error。阅读详情

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qq_21949375 2015-02-06

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C#生成二维码、调用摄像头扫描二维码QR Code等，可直接拿来测试核心代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
 
namespace WindowsFormsApplication1
{
    public class CamWorker
    {
        private const int WM_USER = 0x400;
        private const int WS_CHILD = 0x40000000;
        private const int WS_VISIBLE = 0x10000000;
        private const int WM_CAP_START = WM_USER;
        private const int WM_CAP_STOP = WM_CAP_START   68;
        private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START   10;
        private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START   11;
        private const int WM_CAP_SAVEDIB = WM_CAP_START   25;
        private const int WM_CAP_GRAB_FRAME = WM_CAP_START   60;
        private const int WM_CAP_SEQUENCE = WM_CAP_START   62;
        private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START   20;
        private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START   63;
        private const int WM_CAP_SET_OVERLAY = WM_CAP_START   51;
        private const int WM_CAP_SET_PREVIEW = WM_CAP_START   50;
        private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START   6;
        private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START   2;
        private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START   3;
        private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START   5;
        private const int WM_CAP_SET_SCALE = WM_CAP_START   53;
        private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START   52;
        private IntPtr hWndC;
        private bool bWorkStart = false;
        private IntPtr mControlPtr;
        private int mWidth;
        private int mHeight;
        private int mLeft;
        private int mTop;
 
        /// <summary>
        /// 初始化显示图像
        /// </summary>
        /// <param name= “handle “> 控件的句柄 </param>
        /// <param name= “left “> 开始显示的左边距 </param>
        /// <param name= “top “> 开始显示的上边距 </param>
        /// <param name= “width “> 要显示的宽度 </param>
        /// <param name= “height “> 要显示的长度 </param>
        public CamWorker(IntPtr handle, int left, int top, int width, int height)
        {
            mControlPtr = handle;
            mWidth = width;
            mHeight = height;
            mLeft = left;
            mTop = top;
        }
 
        [DllImport("avicap32.dll ")]
        private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
 
        [DllImport("avicap32.dll ")]
        private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);
 
        //
        //这里特别注意，因为WinAPI中的long为32位，而C#中的long为64wei，所以需要将lParam该为int
        //
        [DllImport("User32.dll ")]
        private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);
 
        /// <summary>
        /// 开始显示图像
        /// </summary>
        public void Start()
        {
            if (bWorkStart)
                return;
 
            bWorkStart = true;
            byte[] lpszName = new byte[100];
 
            hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
 
            if (hWndC.ToInt32() != 0)
            {
                SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
                SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
                SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
                SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
                SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
                SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
                SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
                SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
                //Global.log.Write( “SendMessage “);
            }
            return;
 
        }
 
        /// <summary>
        /// 停止显示
        /// </summary>
        public void Stop()
        {
            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
            bWorkStart = false;
        }
 
        /// <summary>
        /// 抓图
        /// </summary>
        /// <param name= “path “> 要保存bmp文件的路径 </param>
        public void GrabImage(string path)
        {
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
        }
    }
}

网络菜鸟00 2014-01-30

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问题解决，还不结帖？过年去了啊？

hutsss 2014-01-30

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引用 2 楼 u011130289 的回复:

http://social.msdn.microsoft.com/Forums/windowsapps/zh-CN/2f3ed087-f313-4b52-a554-01f7cc641ad6?forum=winstoreappzhcn http://luyugao.com/CSharp/54/

谢谢，这个很值得参考！

hutsss 2014-01-30

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引用 3 楼 caozhy 的回复:

http://download.csdn.net/detail/caozhy/6876349

这个最直接，已经用上了，谢谢！

hutsss 2014-01-30

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引用 1 楼 sp1234 的回复:

http://www.google.com.hk/search?newwindow=1&safe=strict&hl=zh-CN&biw=1533&bih=815&q=c%23+zxing.dll+%E4%BD%BF%E7%94%A8&oq=c%23+zxing.dll+%E4%BD%BF%E7%94%A8&gs_l=serp.12...0.0.0.1070.0.0.0.0.0.0.0.0..0.0....0...1c..32.serp..0.0.0.tcwwghuBOvc

这个打开是一个广告。