Licence Plate Recognition Software Open Source
Recently I stumbled upon an interesting open source framework called OpenALPR (Automated License Plate Recognition). This seemed very interesting for trying out on the. The OpenALPR framework has a couple of dependencies that you have to download and compile first. Check out the instructions on the OpenALPR framework GitHub repository: You need these libraries: OpenCV – Leptonica – Tesseract OCR – OpenALPR – After compiling everything, which took quite a while, I created a simple Python script that takes a photo from a webcam and processes it using the OpenALPR. The Python script processes and presents the license plate recognition results. You can check the script at my GitHub repository: Video of the Python script in use: The webcam takes images of size 640×480. This is the image that was taken and used for automated license plate recognition in this video: Recognition takes quite a while, about 10-13 seconds. I’ve been testing this with 7 plates and the recognition results are very good.
Run your own license plate recognition system with. OpenALPR is an open source software library. And it quickly scans each frame for license plates in. License plate recognition implemented on Raspberry Pi using open source frameworks - OpenALPR and OpenCV.
All plates have successfully been recognized. If you liked this blog post I’d appreciate if you followed me on Twitter. I got it working but it doesn’t give any result! + this script needs a small modification is: add shell=False in: subprocess.Popen(self.alpr_command_args, stdout=subprocess.PIPE, shell=False) and subprocess.Popen(self.webcam_command_args, stdout=subprocess.PIPE, shell=False) but i got no result: when i delete “–quiet” from “fswebcam” command i get everything working with the webcam, the image is written in “image-name.jpg” and thats all nothing else. There is no other script to make it work in streaming?
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README.md openalpr OpenALPR is an open source Automatic License Plate Recognition library written in C++ with bindings in C#, Java, Node.js, Go, and Python. The library analyzes images and video streams to identify license plates.
The output is the text representation of any license plate characters. Check out a live online demo here: User Guide OpenALPR includes a command line utility. Simply typing 'alpr [image file path]' is enough to get started recognizing license plate images.
For example, the following output is created by analyzing this image: user@linux:~/openalpr$ alpr./samplecar.png plate0: top 10 results -- Processing Time = 58.1879ms. - PE3R2X confidence: 88.9371 - PE32X confidence: 78.1385 - PE3R2 confidence: 77.5444 - PE3R2Y confidence: 76.1448 - P63R2X confidence: 72.9016 - FE3R2X confidence: 72.1147 - PE32 confidence: 66.7458 - PE32Y confidence: 65.3462 - P632X confidence: 62.1031 - P63R2 confidence: 61.5089 Detailed command line usage: user@linux:~/openalpr$ alpr --help USAGE: alpr [-c ] [--config ] [-n ] [--seek ] [-p ] [--clock] [-d] [-j] [--] [--version] [-h] Where: -c, --country Country code to identify (either us for USA or eu for Europe). Default=us --config Path to the openalpr.conf file -n, --topn Max number of possible plate numbers to return. Default=10 --seek Seek to the specified millisecond in a video file. Default=0 -p, --pattern Attempt to match the plate number against a plate pattern (e.g., md for Maryland, ca for California) --clock Measure/print the total time to process image and all plates. Default=off -d, --detect_region Attempt to detect the region of the plate image.
[Experimental] Default=off -j, --json Output recognition results in JSON format. Default=off --, --ignore_rest Ignores the rest of the labeled arguments following this flag.
--version Displays version information and exits. -h, --help Displays usage information and exits. Image containing license plates OpenAlpr Command Line Utility Binaries Pre-compiled Windows binaries can be downloaded on the Install OpenALPR on Ubuntu 16.04 with the following commands: sudo apt-get update && sudo apt-get install -y openalpr openalpr-daemon openalpr-utils libopenalpr-dev Documentation Detailed documentation is available at Integrating the Library OpenALPR is written in C++ and has bindings in C#, Python, Node.js, Go, and Java. Please see this guide for examples showing how to run OpenALPR in your application: Compiling OpenALPR compiles and runs on Linux, Mac OSX and Windows.
OpenALPR requires the following additional libraries: - Tesseract OCR v3.0.4 (- OpenCV v2.4.8+ (After cloning this GitHub repository, you should download and extract Tesseract and OpenCV source code into their own directories. Compile both libraries.
Please follow these detailed compilation guides for your respective operating system: • • • • • • • If all went well, there should be an executable named alpr along with libopenalpr-static.a and libopenalpr.so that can be linked into your project. # Build docker image docker build -t openalpr # Download test image wget # Run alpr on image docker run -it --rm -v $(pwd ):/data:ro openalpr -c eu h786poj.jpg Questions Please post questions or comments to the Google group list: Contributions Improvements to the OpenALPR library are always welcome. Please review the and get started. Code contributions are not the only way to help out. Do you have a large library of license plate images? If so, please upload your data to the anonymous FTP located at upload.openalpr.com. Do you have time to 'tag' plate images in an input image or help in other ways?
Please let everyone know by posting a note in the forum. License Affero GPLv3 Commercial-friendly licensing available.