mirror of
https://github.com/kerberos-io/openalpr-base.git
synced 2025-10-06 11:16:50 +08:00
125 lines
3.9 KiB
Markdown
125 lines
3.9 KiB
Markdown
openalpr
|
|
========
|
|
|
|
OpenALPR is an open source *Automated License Plate Recognition* library written in C++. The library analyzes images and identifies license plates. The output is the text representation of any license plate characters found in the image.
|
|
|
|
Check out a live online demo here: http://www.openalpr.com/demo.html
|
|
|
|
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:
|
|
|
|
|
|
|
|
The library is told that this is a Missouri (MO) license plate which validates the plate letters against a regional template.
|
|
|
|
```
|
|
user@linux:~/openalpr$ alpr ./samplecar.png -t mo -r ~/openalpr/runtime_dir/
|
|
|
|
plate0: top 10 results -- Processing Time = 58.1879ms.
|
|
- PE3R2X confidence: 88.9371 template_match: 1
|
|
- PE32X confidence: 78.1385 template_match: 0
|
|
- PE3R2 confidence: 77.5444 template_match: 0
|
|
- PE3R2Y confidence: 76.1448 template_match: 1
|
|
- P63R2X confidence: 72.9016 template_match: 0
|
|
- FE3R2X confidence: 72.1147 template_match: 1
|
|
- PE32 confidence: 66.7458 template_match: 0
|
|
- PE32Y confidence: 65.3462 template_match: 0
|
|
- P632X confidence: 62.1031 template_match: 0
|
|
- P63R2 confidence: 61.5089 template_match: 0
|
|
|
|
```
|
|
|
|
Detailed command line usage:
|
|
|
|
```
|
|
user@linux:~/openalpr$ alpr --help
|
|
|
|
USAGE:
|
|
|
|
alpr [-t <region code>] [-r <runtime_dir>] [-n <topN>]
|
|
[--seek <integer_ms>] [-c <country_code>]
|
|
[--clock] [-d] [-j] [--] [--version] [-h]
|
|
<image_file_path>
|
|
|
|
|
|
Where:
|
|
|
|
-t <region code>, --template_region <region code>
|
|
Attempt to match the plate number against a region template (e.g., md
|
|
for Maryland, ca for California)
|
|
|
|
-r <runtime_dir>, --runtime_dir <runtime_dir>
|
|
Path to the OpenAlpr runtime data directory
|
|
|
|
-n <topN>, --topn <topN>
|
|
Max number of possible plate numbers to return. Default=10
|
|
|
|
--seek <integer_ms>
|
|
Seek to the specied millisecond in a video file. Default=0
|
|
|
|
-c <country_code>, --country <country_code>
|
|
Country code to identify (either us for USA or eu for Europe).
|
|
Default=us
|
|
|
|
--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. 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_file_path>
|
|
(required) Image containing license plates
|
|
|
|
|
|
OpenAlpr Command Line Utility
|
|
```
|
|
|
|
|
|
Compiling
|
|
-----------
|
|
|
|
OpenALPR compiles and runs on Linux, Mac OSX and Windows.
|
|
|
|
OpenALPR requires the following additional libraries:
|
|
|
|
- Tesseract OCR v3.x (https://code.google.com/p/tesseract-ocr/)
|
|
- OpenCV v2.4.x (http://opencv.org/)
|
|
|
|
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:
|
|
|
|
* [Windows] (https://github.com/openalpr/openalpr/wiki/Compilation-instructions-(Windows))
|
|
* [Ubuntu Linux] (https://github.com/openalpr/openalpr/wiki/Compilation-instructions-(Ubuntu-Linux))
|
|
|
|
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.
|
|
|
|
|
|
Questions
|
|
---------
|
|
Please post questions or comments to the Google group list: https://groups.google.com/forum/#!forum/openalpr
|
|
|
|
License
|
|
-------
|
|
|
|
Affero GPLv3
|
|
http://www.gnu.org/licenses/agpl-3.0.html
|