EU License Plate OCR Java

The Java OCR SDK supports the License Plate API.

Using the sample below, we are going to illustrate how to extract the data that we want using the OCR SDK.
License Plate sample

Quick-Start

import com.mindee.MindeeClient;
import com.mindee.input.LocalInputSource;
import com.mindee.parsing.common.PredictResponse;
import com.mindee.product.eu.licenseplate.LicensePlateV1;
import java.io.File;
import java.io.IOException;

public class SimpleMindeeClient {

  public static void main(String[] args) throws IOException {
    String apiKey = "my-api-key";
    String filePath = "/path/to/the/file.ext";

    // Init a new client
    MindeeClient mindeeClient = new MindeeClient(apiKey);

    // Load a file from disk
    LocalInputSource inputSource = new LocalInputSource(filePath);

    // Parse the file
    PredictResponse<LicensePlateV1> response = mindeeClient.parse(
        LicensePlateV1.class,
        inputSource
    );

    // Print a summary of the response
    System.out.println(response.toString());

    // Print a summary of the predictions
//  System.out.println(response.getDocument().toString());

    // Print the document-level predictions
//    System.out.println(response.getDocument().getInference().getPrediction().toString());

    // Print the page-level predictions
//    response.getDocument().getInference().getPages().forEach(
//        page -> System.out.println(page.toString())
//    );
  }

}

Output (RST):

########
Document
########
:Mindee ID: f0f48232-2c80-4473-9c6f-88a09111b84d
:Filename: default_sample.jpg

Inference
#########
:Product: mindee/license_plates v1.0
:Rotation applied: No

Prediction
==========
:License Plates: BY-323-YB

Page Predictions
================

Page 0
------
:License Plates: BY-323-YB

Field Types

Standard Fields

These fields are generic and used in several products.

BaseField

Each prediction object contains a set of fields that inherit from the generic BaseField class.
A typical BaseField object will have the following attributes:

confidence (Double): the confidence score of the field prediction.
boundingBox (Polygon): contains exactly 4 relative vertices (points) coordinates of a right rectangle containing the field in the document.
polygon (Polygon): contains the relative vertices coordinates (polygon extends List<Point>) of a polygon containing the field in the image.
pageId (Integer): the ID of the page, always null when at document-level.

Note: A Point simply refers to a List of Double.

Aside from the previous attributes, all basic fields have access to a custom toString method that can be used to print their value as a string.

StringField

The text field StringField extends BaseField, but also implements:

value (String): corresponds to the field value.
rawValue (String): corresponds to the raw value as it appears on the document.

Attributes

The following fields are extracted for License Plate V1:

License Plates

licensePlates: List of all license plates found in the image.

for (licensePlatesElem : result.getDocument().getInference().getPrediction().getLicensePlates())
{
    System.out.println(licensePlatesElem.value);
}

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Updated 5 months ago