Node Express App for OpenAlpr plate recognition

Install

Because I never successed with using [node-openalpr](No https://github.com/netPark/node-openalpr) this express app use the alpr command instead.

• Install OpenAlpr on the computer/host where you will be running this app.
• Download / clone repo and run npm install

Run

• npm start or pm2 start processes.json

Docker support

In the root of the project build and run the project:

• docker build -t gerhardsletten/plate-reader-server .
• docker run -d -p 4500:4500 gerhardsletten/plate-reader-server
• URL="http://192.168.99.100:4500" node test/docker.js // Rename to your docker-machine ip docker-machine ip default

Routes

POST /plates with json:
{
	image: (base64 encoded data),
	country_code: 'eu',
	pattern_code: 'no'
}

returns 
{
	plate: 'DP49829',
	confidence: 79.758995,
	matches_template: 1,
	plate_index: 0,
	region: 'no',
	region_confidence: 0,
	processing_time_ms: 66.374001,
	requested_topn: 10,
	coordinates : {
		...
	},
	candidates : [
		{ plate: 'DP498Z9', confidence: 87.328056, matches_template: 0 },
		{ plate: 'DP98Z9', confidence: 83.397873, matches_template: 0 },
		...
	]

Test

• npm test to test the express app
• node ./test/docker.js to test the running docker, but you will need to adjust the url/port to your running docker