barcode

本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！ 越来越多的手机具备自动对焦的拍摄功能，这也意味着这些手机可以具备条码扫描的功能....... 手机具备条码扫描的功能，可以优化购物流程，快速存储电子名片(二维码)等 。 本文使用ZXing 1.6实现条码/二维码识别。 ZXing 是个很经典的条码/二维码识别的开源类库，long long ago，就有开发者在J2ME上使用ZXing了，不过要支持JSR-234规范(自动对焦)的手机才能发挥其威力，而目前已经有不少Android手机具备自动对焦的功能。 本文代码运行的结果如下，使用91手机助手截图时，无法截取SurfaceView的实时图像： 本文使用了ZXing1.6的core，即把\zxing-1.6\core\下的src复制覆盖工程的src；另外还要使用到\zxing-1.6\android\下的PlanarYUVLuminanceSource.java。 PS：\zxing-1.6\android\ 是BarcodeScanner的源码，本文程序相当于BarcodeScanner的精简版，只保留最基本的识别功能。 源码目录结果如下图，ChecksumException.java下面还有很多源文件，截图尚未列出： main.xml源码如下，main

树莓派小而强大，有非常多的应用场景。这里分享下使用树莓派，摄像头，以及C和Python代码来实现一个条形码扫描工具。之前分享过 如何把OpenCV Python获取的图像传递到C层处理 ，会用到里面的代码。 测试环境 设备: Raspberry Pi 3 系统: RASPBIAN JESSIE WITH PIXEL 准备工作 Dynamsoft Barcode Reader for Raspberry Pi Python 2.7.0 OpenCV 3.0.0 Raspberry Pi 2 or 3 USB webcam 编译和安装 如何在树莓派上编译安装OpenCV 1. 下载 源代码 。 2. 安装依赖库： sudo apt-get install cmake sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev sudo apt-get install libxvidcore-dev libx264-dev sudo apt-get install python-dev 3. 设置编译环境： cd ~/opencv-3.0.0/

用OpenCV Python来开发，如果想要用到一些C/C++的图像处理库，就需要创建Python的C/C++扩展，然后把数据从Python传递到底层处理。这里分享下如何在C/C++层获取数据。 参考原文： How to Convert OpenCV Image Data from Python to C 作者： Xiao Ling 翻译：yushulx 开发环境 Dynamsoft Barcode Reader 4.2 Python version: 2.7.0 OpenCV version: 2.4.10. Download cv2.pyd Windows 10 USB webcam Python C/C++扩展 把 DynamsoftBarcodeReaderx86.dll 和 cv2.pyd 拷贝到目录 Python27\Lib\site-packages 。 OpenCV Python获取的图像数据类型是 numpy.ndarray: > rval, frame = vc.read(); > print type(frame) > <type 'numpy.ndarray'> 在C层我们希望能获取到数据的指针。查看OpenCV源码文件 opencv\modules\python\src2\cv2.cv.hpp 可以找到方法： PyObject *o; if (!PyArg

开源社区提供了DirectShow的.NET版本，为C#开发者提供了便利。这里分享下如何用DirectShow.NET API来启动摄像头，以及获取视频流数据。 参考原文： Read Barcode from Webcam Viewer with DirectShow.NET 作者： Xiao Ling 翻译：yushulx 学习资源 DirectShow.NET library DirectShow.NET Documentation DirectShow.NET samples 示例：获取视频流数据识别barcode 获取连接设备： DsDevice[] devices = DsDevice.GetDevicesOfCat(FilterCategory.VideoInputDevice); 获取DirectShow接口： int hr = 0; this.graphBuilder = (IFilterGraph2)new FilterGraph(); this.captureGraphBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2(); this.mediaControl = (IMediaControl)this.graphBuilder; this.videoWindow = (IVideoWindow

I was wondering how could I integrate a USB barcode scanner into a Qt application, as well as a barcode printer. I looked for tutorials but didn't find anything interesting out there. Any ideas? Thanks in advance. Most barcode scanners, IIRC basically work like a keyboard from the point of view of your application. You just provide a text field and the barcode reader "types" what it reads. So you don't really need to worry about that, other than validating the input and maybe providing a hidden text field if you don't want the input shown. Or a modal dialog saying "scan item" with focus on a

I need to create a Code 128 barcode with a maximum of 44 characters. What is the maximum number of characters supported by the Code 128 barcode format? I came to know that Code 128 can encode all 128 characters of ASCII, but I cannot determine the maximum number of characters it supports. The specification for Code 128 (ISO/IEC 15417) leaves the maximum length undefined and states that this is something that should be defined by any derivative application [*] standard: 4.7.1 Symbology and data characteristics Application specifications should consider the following parameters. b) The number of

I am using Xamarin forms to write an iOS app and using the ZXing library to scan barcodes. I am trying to read a driver's license (PDF417) barcode, but the library is not able to recognize that barcode. If I include UPC or other barcodes in the PossibleFormats, they are scanned correctly. I am also certain the barcode I am trying to read is PDF417 barcode because Scandit is able to recognize it correctly while using only PDF417 barcode. Here is the code I am using. What do I need to change so that the PDF417 barcode is recognized correctly? async void Handle_Clicked (object sender, System