Three years ago, I created a CMake project, aiming to build a C/C++ project with Dynamsoft Barcode Reader on Windows, Linux, and macOS. Today, as the world’s top barcode SDK, Dynamsoft Barcode Reader has extended to more operating systems and CPU architectures:

  • ARM32 Linux: Raspberry Pi
  • ARM64 Linux: Jetson Nano

Now, I only have a Windows PC in hand. How can I build the project for all target environments without purchasing new hardware devices or spending time setting up virtual environments?

One of the economical ways is to use Travis CI. Travis CI is a hosted continuous integration service that…


As the world’s top scanner programming SDK, Dynamic Web TWAIN features a lot of compelling functionalities. By upgrading to the latest version, any web document scanning app built with Dynamic Web TWAIN can be compatible with mobile devices seamlessly. What will happen if you invoke the scanner control APIs on mobile devices? Dynamic Web TWAIN can turn your mobile devices into a remote control for document scanners connected to your PC. In addition to scan documents from a remote document scanner, you can open the cellphone camera to capture documents as well. …


Dynamsoft Label Recognition (DLR) is an OCR SDK implemented in C/C++. The 1.0 Beta version was recently rolled out for Windows and Linux platforms. This article will demonstrate how to utilize the APIs of Dynamsoft Label Recognition to create a text recognition app on Windows.

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Requirements

Free Trial License

Get a free trial license and save it to license.txt file.

Text Recognition in C/C++

Let’s get started with the command-line example (DLR-C_CPP-1.0-Beta\DynamsoftLabelRecognition\Samples\LabelRecognitionDemo) located in the DLR package.

There are 4 essential steps for extracting text from pictures.

  • Initialize the DLR object and set the trial license:
```cpp CLabelRecognition…

Qt Designer is a Qt tool for building cross-platform graphical user interfaces (GUIs) with Qt widgets. In this article, I will use the Qt designer to create an advanced desktop barcode reader app with Dynamsoft Python Barcode SDK for Windows, Linux, macOS, and Raspberry Pi OS. The app contains all the powerful functionalities of Dynamsoft Barcode Reader.

Constructing UI with Qt Designer

The required Qt widgets include:

  • Menu Bar

- Open file

- Open folder

- Save template

- Enter license key

- About

  • Status Bar

- Show status information

  • List Widget

- List loaded file names

  • Label

- Display image or webcam frame

  • Group…


If you want to build a cross-platform GUI app with Python and Qt, you can either use PyQt or PySide. Both of them are Qt bindings for Python. The main difference is the license: PyQt5 is released under GPL or commercial, whereas PySide2 is released under LGPL. Since PySide2 is recommended officially, I will use PySid2 and Dynamsoft Python Barcode SDK to create a GUI barcode reader app on Raspberry Pi.

Requirements

  • OpenCV Python
python3 -m pip install opencv-python
  • Dynamsoft Python Barcode SDK
python3 -m pip install dbr
  • PySide2
sudo apt-get install python3-pyside2.qt3dcore python3-pyside2.qt3dinput python3-pyside2.qt3dlogic python3-pyside2.qt3drender python3-pyside2.qtcharts python3-pyside2.qtconcurrent python3-pyside2.qtcore python3-pyside2.qtgui python3-pyside2.qthelp…

Someone may be curious about whether Intel-based Python apps can work well on Apple M1 Mac. I recently did a test with Dynamsoft Python Barcode SDK, which is built with native x86_64 libraries and CPython. It turned out that there was no issue using pip to install the wheel package and running my Python barcode reader app.

Installing Pip and Python Barcode Wheel Package

When you open the terminal app and type in Python3 the first time, a prompt dialog will pop up for installing the command line developer tools.

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Click Install and wait a while for installing the relevant tools. …


While scanning single or multiple barcodes with a barcode SDK, most of the developers only concern about the trade-off between decoding speed and recognition accuracy, for they cannot get other data. Since from version 8.0, Dynamsoft exposes more parameters and intermediate results (E.g., grayscale image, binary image, barcode localization results, etc.) to developers for app debugging and optimizing, which makes Dynamsoft Barcode SDK stand out from commercial barcode SDKs. In this article, I will go through some relevant parameters and APIs.

Requirements

  • CMake
  • OpenCV 4.5.0. For Windows, you need to add “OpenCV_DIR = C:\opencv\build" to system environment variables.
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In the warehouse management system, Drone can be used to automate barcode scanning for inventory counts. To learn drone piloting and try barcode scanning in the air, I bought Ryze Tello, which is a mini drone powered by DJI. In this article, I will share how to detect and decode barcodes from Tello drone’s video stream using Dynamsoft Barcode Reader in real-time.

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Porting Tello Video Sample from Python 2.7 to Python 3.7

The sample code dji-sdk/Tello-Python is a good crash course for Tello drone control. However, the maintenance of the repository seems to be halted, and the code is only available for Python 2.7.

Since Python 2 is no longer…


Apple announced new Mac models with Apple M1 chip recently. Although Dynamsoft has not released an Apple Silicon version of Dynamsoft Barcode Reader SDK yet, I am curious how will x86_64 barcode SDK perform under Rosetta 2. In this article, I will build a simple command-line barcode reader app on M1-powered MacBook Air, and compare the barcode decoding performance by running the app respectively on Intel-based macOS and M1-based macOS.

Mac Barcode SDK Download

Dynamsoft Barcode Reader v7.6 for macOS

Note: the header file included in the package only supports Objective-C and Swift. …


In the past two weeks, I trained a custom YOLOv3 model for QR code detection and tested it with Darknet. In this article, I will use OpenCV’s DNN (Deep Neural Network) module to load the YOLO model for making detection from static images and real-time camera video stream. Besides, I will use Dynamsoft Barcode Reader to decode QR codes from the regions detected by YOLO.

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YOLO QR Code Detection with OpenCV Python

Install OpenCV ( CPU only) via pip:

pip install opencv-python

You can get qrcode.names, qrcode-yolov3-tiny.cfg and qrcode-yolov3-tiny.weights files from the package YOLOv3-tiny-QR.

To quickly get familiar with the OpenCV DNN APIs, we can refer to…

Xiao Ling

Manager of Dynamsoft Open Source Projects | Tech Lover

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