Generally, while doing barcode detection, we pass color images encoded in RGB or YUV to some barcode decoding APIs, in which the image data will be converted from color to grayscale and then from grayscale to binary. Operating pixels takes much CPU time. To accelerate image processing, we can utilize GPU. Dynamsoft JavaScript barcode SDK is powerful for developing web barcode scanning apps, but it is designed for CPU only so far. In this article, I will show you how to use WebGL to convert color image to grayscale image in order to reduce the total CPU time cost when reading barcodes from camera video stream in web apps.
Read moreInsight Into Dynamsoft Barcode SDK Decoding Performance
Many enterprises like to use Dynamsoft Barcode Reader SDK due to its flexible parameter configuration and powerful decoding capability for multiple barcodes. In this article, let’s take a glimpse of the barcode SDK template and the possible way to optimize the decoding performance from a developer’s angle.
Read moreNode.js Barcode Reader for Desktop and Web
Last week, I shared how to display webcam video in desktop and web apps. Based on that, I implemented the barcode reading function using Node.js. In this article, I will share how to build Node.js barcode reader apps for desktop and web with Dynamsoft Barcode Reader SDK.
Read moreHow to Use OpenCV to Build Simple Webcam Apps for Desktop and Web
During the pandemic, the demand for camera apps is booming due to the social distancing situation. So, I collected some basic OpenCV webcam sample code implemented in different programming languages and built some simple web apps for remote webcam access. Hopefully, it will be helpful for someone who is getting started to build webcam apps. In this article, I will use JavaScript, C#, Python, and Golang.
Read moreReading Driver’s License Information from PDF417 in JavaScript
A few weeks ago, I wrote an article sharing how to read driver’s license information from PDF417 on Android. Comparing to building an Android native camera app, building a web camera app is much easier. In this article, let’s take a glimpse at a JavaScript sample, which is implemented with a few lines of code by invoking Dynamsoft JavaScript barcode SDK.
Read moreHow to Read Nonstandard 1D Barcode with Dynamsoft Barcode SDK
Start and stop characters are defined as part of linear barcode (1D barcode) standard. However, you may suffer from some nonstandard 1D barcode symbologies in which the start and stop characters are somehow changed. In this article, I will take Code39 as an example, demonstrating how to decode nonstandard 1D barcodes using Dynamsoft Barcode Reader SDK.
Read moreHow to Build C/C++ Barcode Reader App on Raspberry Pi 4
I recently purchased a Raspberry Pi 4 (4GB model) and an I2C OLED display module. In this article, I will share how to implement a C/C++ barcode reader project on Raspberry Pi 4 from scratch.
Read moreHow to Recognize US Driver’s License on Android Mobile Apps
According to the American Association of Motor Vehicle Administrators (AAMVA) specification, PDF417 symbology is used for storing personal information on US driver’s license. In this article, I will use Google mobile vision APIs to recognize a driver’s license. Besides, I will create a similar Android barcode reader app to extract information from PDF417 symbology by Dynamsoft Barcode Reader SDK.
Read moreHow to Solve MinGW _ZNSt18condition_variable10notify_oneEv Error on Windows 10
When I was trying to run a barcode reader app compiled by MinGW GCC on Windows 10, I got an error message “The procedure entry point _ZNSt18condition_variable10notify_oneEv could not be located in the dynamic link library”. In this article, I will share my experience of how to solve the issue on Windows 10.
Read moreHow to Make DotCode Webcam Scanner in C++ on Windows 10
Previously, I wrote an article showing how to build a DotCode reader in Java. I also updated my C# barcode demo to make it support DotCode decoding recently. In this article, I will share a new webcam scanner sample implemented in C++.
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