License Plate Recognition

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This document provides code examples for using License Plate Recognition in popular programming languages.

Note
  • For real-time assistance, start an online consultation.

  • If you have questions about API access or usage for the Alibaba Cloud Vision AI Platform, join our DingTalk group (ID: 23109592) to contact us.

Introduction

For an overview of the License Plate Recognition feature and its API parameters, see License Plate Recognition.

Install the SDK

For the SDK package for popular languages, see SDK overview.

Configure environment variables

Configure the ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET environment variables.

Important
  • An Alibaba Cloud account has full access to all API operations. We recommend that you use a RAM user for API calls or routine O&M. For more information, see Create a RAM user.

  • Do not save your AccessKey ID or AccessKey Secret in project code. Otherwise, the AccessKey pair may be leaked and the security of all resources in your account may be compromised.

  • Configure environment variables on Linux and macOS

    1. Open a terminal in IntelliJ IDEA.

    2. Run the following commands to configure the environment variables.

      Replace <access_key_id> with the AccessKey ID of your RAM user and <access_key_secret> with the AccessKey Secret of your RAM user. If you need to configure more permissions, see Control access permissions using a RAM policy.

      export ALIBABA_CLOUD_ACCESS_KEY_ID=<access_key_id>
      export ALIBABA_CLOUD_ACCESS_KEY_SECRET=<access_key_secret>
  • Configure environment variables on Windows

    Create a new environment variable file, add the environment variables ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET, and set them to the AccessKey ID and AccessKey Secret that you have prepared. Then, restart the Windows operating system. The following example uses Windows 10.

    1. Open File Explorer, right-click This PC, and then select Properties.

    2. In the left-side navigation pane, click Advanced system settings.

    3. On the Advanced tab of the System Properties dialog box, click Environment Variables.

    4. In the Environment Variables dialog box, click New.

    5. In the New System Variable dialog box, add the environment variables ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET, and set them to the AccessKey ID and AccessKey Secret that you have prepared.

    6. Restart the Windows operating system for the configurations to take effect.

Sample code

Image in OSS (Shanghai)

/*
Add the dependency package.
<!-- https://mvnrepository.com/artifact/com.aliyun/ocr20191230 -->
<dependency>
      <groupId>com.aliyun</groupId>
      <artifactId>ocr20191230</artifactId>
      <version>${aliyun.ocr.version}</version>
</dependency>
*/

import com.aliyun.ocr20191230.models.RecognizeLicensePlateResponse;
import com.aliyun.tea.TeaException;
import com.aliyun.tea.TeaModel;

public class RecognizeLicensePlate {

    public static com.aliyun.ocr20191230.Client createClient(String accessKeyId, String accessKeySecret) throws Exception {
        /*
          Initialize the configuration object com.aliyun.teaopenapi.models.Config.
          This object stores configuration parameters such as your AccessKey ID, AccessKey Secret, and endpoint.
         */
         com.aliyun.teaopenapi.models.Config config = new com.aliyun.teaopenapi.models.Config()
                .setAccessKeyId(accessKeyId)
                .setAccessKeySecret(accessKeySecret);
        // The service endpoint.
        config.endpoint = "ocr.cn-shanghai.aliyuncs.com";
        return new com.aliyun.ocr20191230.Client(config);
    }

    public static void main(String[] args) throws Exception {
        // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html
        // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html
        // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
        String accessKeyId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
        String accessKeySecret = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET"); 
        com.aliyun.ocr20191230.Client client = RecognizeLicensePlate.createClient(accessKeyId, accessKeySecret);
        com.aliyun.ocr20191230.models.RecognizeLicensePlateRequest recognizeLicensePlateRequest = new com.aliyun.ocr20191230.models.RecognizeLicensePlateRequest()
                .setImageURL("http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg");
        com.aliyun.teautil.models.RuntimeOptions runtime = new com.aliyun.teautil.models.RuntimeOptions();
        try {
            // Print the API response.
            RecognizeLicensePlateResponse response = client.recognizeLicensePlateWithOptions(recognizeLicensePlateRequest, runtime);
            System.out.println(com.aliyun.teautil.Common.toJSONString(TeaModel.buildMap(response)));
        } catch (TeaException error) {
            // Print the full error message.
            System.out.println(com.aliyun.teautil.Common.toJSONString(error));
            // Print the error code.
            System.out.println(error.getCode());
        }
    }
}
# -*- coding: utf-8 -*-
# Add the dependency package.
# pip install alibabacloud_ocr20191230

import os
from alibabacloud_ocr20191230.client import Client
from alibabacloud_ocr20191230.models import RecognizeLicensePlateRequest
from alibabacloud_tea_openapi.models import Config
from alibabacloud_tea_util.models import RuntimeOptions

config = Config(
  # To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html
  # If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html
  # This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
  access_key_id=os.environ.get('ALIBABA_CLOUD_ACCESS_KEY_ID'),
  access_key_secret=os.environ.get('ALIBABA_CLOUD_ACCESS_KEY_SECRET'),
  # The service endpoint.
  endpoint='ocr.cn-shanghai.aliyuncs.com',
  # The region ID that corresponds to the endpoint.
  region_id='cn-shanghai'
)
recognize_license_plate_request = RecognizeLicensePlateRequest(
    image_url='http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg'
)
runtime = RuntimeOptions()
try:
  # Initialize the client.
  client = Client(config)
  response = client.recognize_license_plate_with_options(recognize_license_plate_request, runtime)
  # Print the full response.
  print(response.body)
except Exception as error:
  # Print the full error message.
  print(error)
  # Print the error code.
  print(error.code)
<?php

// Install the dependency package.
// composer require alibabacloud/ocr-20191230

use AlibabaCloud\SDK\Ocr\V20191230\Ocr;
use \Exception;
use AlibabaCloud\Tea\Utils\Utils;
use Darabonba\OpenApi\Models\Config;
use AlibabaCloud\SDK\Ocr\V20191230\Models\RecognizeLicensePlateRequest;
use AlibabaCloud\Tea\Utils\Utils\RuntimeOptions;

class RecognizeLicensePlate {

    /**
     * Initialize the client by using the AccessKey pair.
     * @param string $accessKeyId
     * @param string $accessKeySecret
     * @return Ocr Client
     */
    public static function createClient($accessKeyId, $accessKeySecret){
        // Initialize the configuration object Darabonba\OpenApi\Models\Config.
        // This object stores configuration parameters such as your AccessKey ID, AccessKey Secret, and endpoint.
        $config = new Config([
            "accessKeyId" => $accessKeyId,
            "accessKeySecret" => $accessKeySecret
        ]);
        // The service endpoint.
        $config->endpoint = "ocr.cn-shanghai.aliyuncs.com";
        return new Ocr($config);
    }

    /**
     * @param string[] $args
     * @return void
     */
    public static function main($args){
        // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html.
        // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html.
        // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
        $accessKeyId = getenv('ALIBABA_CLOUD_ACCESS_KEY_ID');      
        $accessKeySecret = getenv('ALIBABA_CLOUD_ACCESS_KEY_SECRET');
        $client = self::createClient($accessKeyId, $accessKeySecret);
        $recognizeLicensePlateRequest = new RecognizeLicensePlateRequest([
            "imageURL" => "http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg"
        ]);
        $runtime = new RuntimeOptions([]);
        try {
            $resp = $client->recognizeLicensePlateWithOptions($recognizeLicensePlateRequest, $runtime);
            // Print the full response.
            echo Utils::toJSONString($resp->body);
        } catch (Exception $exception) {
            // Print the full error message.
            echo Utils::toJSONString($exception);
            // Print the error code.
            echo $exception->getCode();
        }
    }
}
$path = __DIR__ . \DIRECTORY_SEPARATOR . '..' . \DIRECTORY_SEPARATOR . 'vendor' . \DIRECTORY_SEPARATOR . 'autoload.php';
if (file_exists($path)) {
    require_once $path;
}
// $argv is a reserved array for input parameters and does not need to be modified.
RecognizeLicensePlate::main(array_slice($argv, 1));
// Install the dependency package.
// npm install @alicloud/ocr20191230
const OcrClient = require('@alicloud/ocr20191230');
const OpenapiClient = require('@alicloud/openapi-client');
const TeaUtil = require('@alicloud/tea-util');

let config = new OpenapiClient.Config({
  // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html.
  // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html.
  // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
  accessKeyId: process.env.ALIBABA_CLOUD_ACCESS_KEY_ID,   
  accessKeySecret: process.env.ALIBABA_CLOUD_ACCESS_KEY_SECRET
});
// The service endpoint.
config.endpoint = `ocr.cn-shanghai.aliyuncs.com`;
const client = new OcrClient.default(config);
let recognizeLicensePlateRequest = new OcrClient.RecognizeLicensePlateRequest({
  imageURL: "http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg",
});
let runtime = new TeaUtil.RuntimeOptions({});
client.recognizeLicensePlateWithOptions(recognizeLicensePlateRequest, runtime)
  .then(function (recognizeLicensePlateResponse) {
    // Print the full response.
    console.log(recognizeLicensePlateResponse);
    // Print a single field from the response.
    console.log(recognizeLicensePlateResponse.body.data);
  }, function (error) {
    // Print the full error message.
    console.log(error);
    // Print the error code.
    console.log(error.data.Code);
  })
/**
This example depends on github.com/alibabacloud-go/ocr-20191230/v3.
We recommend that you use 'go mod tidy' to install the dependency.
*/
package main

import (
	"fmt"
	openapi "github.com/alibabacloud-go/darabonba-openapi/v2/client"
	ocr20191230  "github.com/alibabacloud-go/ocr-20191230/v3/client"
	util "github.com/alibabacloud-go/tea-utils/v2/service"
	"github.com/alibabacloud-go/tea/tea"
)

func main() {  
  // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html.
  // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html.
  // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
  accessKeyId := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_ID")  
  accessKeySecret := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET")
  // Initialize the configuration object &openapi.Config. This object stores configuration parameters such as your AccessKey ID, AccessKey Secret, and endpoint.
  config := &openapi.Config{
    AccessKeyId: tea.String(accessKeyId),
    AccessKeySecret: tea.String(accessKeySecret)
	}
	// The service endpoint.
	config.Endpoint = tea.String("ocr.cn-shanghai.aliyuncs.com")
	client, err := ocr20191230.NewClient(config)
	if err != nil {
		fmt.Println(err.Error())
	}

	recognizeLicensePlateRequest := &ocr20191230.RecognizeLicensePlateRequest{
		ImageURL: tea.String("http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg"),
	}
	runtime := &util.RuntimeOptions{}
	recognizeLicensePlateResponse, _err := client.RecognizeLicensePlateWithOptions(recognizeLicensePlateRequest, runtime)
	if _err != nil {
		fmt.Println(_err.Error())
	} else {
		// Print the full response.
		fmt.Println(recognizeLicensePlateResponse)
		// Print a single field from the response.
		fmt.Println(recognizeLicensePlateResponse.Body.Data)
	}
}
// Install the dependency package.
// dotnet add package AlibabaCloud.SDK.Ocr20191230
using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Net;
using System.Threading.Tasks;
using AlibabaCloud.SDK.Ocr20191230.Models;
using Tea;
using Tea.Utils;

namespace AlibabaCloud.SDK.Sample
{
    public class Sample
    {
        /**
            * Initialize the client by using the AccessKey pair.
            * @param accessKeyId
            * @param accessKeySecret
            * @return Client
            * @throws Exception
        */
        public static AlibabaCloud.SDK.Ocr20191230.Client CreateClient(string accessKeyId, string accessKeySecret)
        {
            AlibabaCloud.OpenApiClient.Models.Config config = new AlibabaCloud.OpenApiClient.Models.Config
            {
                AccessKeyId = accessKeyId,
                AccessKeySecret = accessKeySecret,
            };
            // The service endpoint.
            config.Endpoint = "ocr.cn-shanghai.aliyuncs.com";
            return new AlibabaCloud.SDK.Ocr20191230.Client(config);
        }
        public static void Main(string[] args)
        {
            // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html
            // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html
            // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
            AlibabaCloud.SDK.Ocr20191230.Client client = CreateClient(System.Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_ID"), System.Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_SECRET"));
            AlibabaCloud.SDK.Ocr20191230.Models.RecognizeLicensePlateRequest recognizeLicensePlateRequest = new AlibabaCloud.SDK.Ocr20191230.Models.RecognizeLicensePlateRequest
            {
                ImageURL = "http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg",
            };
            AlibabaCloud.TeaUtil.Models.RuntimeOptions runtime = new AlibabaCloud.TeaUtil.Models.RuntimeOptions();
            try
            {
                AlibabaCloud.SDK.Ocr20191230.Models.RecognizeLicensePlateResponse recognizeLicensePlateResponse = client.RecognizeLicensePlateWithOptions(recognizeLicensePlateRequest, runtime);
                // Print the full response.
                Console.WriteLine(AlibabaCloud.TeaUtil.Common.ToJSONString(recognizeLicensePlateResponse.Body));
                // Print a single field from the response.
                Console.WriteLine(AlibabaCloud.TeaUtil.Common.ToJSONString(recognizeLicensePlateResponse.Body.Data));
            }
            catch (TeaException error)
            {
                // Print the error.
                AlibabaCloud.TeaUtil.Common.AssertAsString(error.Message);
            }
            catch (Exception _error)
            {
                TeaException error = new TeaException(new Dictionary<string, object>
                {
                    { "message", _error.Message }
                });
                // Print the error.
                Console.WriteLine(error.Message);
            }
        }
    }
}

Image from a local file or URL

/*
Add the dependency package.
<!-- https://mvnrepository.com/artifact/com.aliyun/ocr20191230 -->
<dependency>
      <groupId>com.aliyun</groupId>
      <artifactId>ocr20191230</artifactId>
      <version>${aliyun.ocr.version}</version>
</dependency>
*/

import com.aliyun.ocr20191230.models.RecognizeLicensePlateResponse;
import com.aliyun.tea.TeaException;
import com.aliyun.tea.TeaModel;

import java.net.URL;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

public class RecognizeLicensePlate {

    public static com.aliyun.ocr20191230.Client createClient(String accessKeyId, String accessKeySecret) throws Exception {
        /*
          Initialize the configuration object com.aliyun.teaopenapi.models.Config.
          This object stores configuration parameters such as your AccessKey ID, AccessKey Secret, and endpoint.
         */
         com.aliyun.teaopenapi.models.Config config = new com.aliyun.teaopenapi.models.Config()
                .setAccessKeyId(accessKeyId)
                .setAccessKeySecret(accessKeySecret);
        // The service endpoint.
        config.endpoint = "ocr.cn-shanghai.aliyuncs.com";
        return new com.aliyun.ocr20191230.Client(config);
    }

    public static void main(String[] args) throws Exception {
        // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html
        // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html
        // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
        String accessKeyId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
        String accessKeySecret = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET"); 
        com.aliyun.ocr20191230.Client client = RecognizeLicensePlate.createClient(accessKeyId, accessKeySecret);
        // Scenario 1: Use an image from a local file.
        // InputStream inputStream = new FileInputStream(new File("/tmp/RecognizeLicensePlate1.jpg"));
        // Scenario 2: Use an image from a public URL.
        URL url = new URL("http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg");
        InputStream inputStream = url.openConnection().getInputStream();
        com.aliyun.ocr20191230.models.RecognizeLicensePlateAdvanceRequest recognizeLicensePlateAdvanceRequest = new com.aliyun.ocr20191230.models.RecognizeLicensePlateAdvanceRequest()
                .setImageURLObject(inputStream);
        com.aliyun.teautil.models.RuntimeOptions runtime = new com.aliyun.teautil.models.RuntimeOptions();
        try {
            // Print the API response.
            RecognizeLicensePlateResponse response = client.recognizeLicensePlateAdvance(recognizeLicensePlateAdvanceRequest, runtime);
            System.out.println(com.aliyun.teautil.Common.toJSONString(TeaModel.buildMap(response)));
        } catch (TeaException error) {
            // Print the full error message.
            System.out.println(com.aliyun.teautil.Common.toJSONString(error));
            // Print the error code.
            System.out.println(error.getCode());
        }
    }
}
# -*- coding: utf-8 -*-
# Add the dependency package.
# pip install alibabacloud_ocr20191230

import os
import io
from urllib.request import urlopen
from alibabacloud_ocr20191230.client import Client
from alibabacloud_ocr20191230.models import RecognizeLicensePlateAdvanceRequest
from alibabacloud_tea_openapi.models import Config
from alibabacloud_tea_util.models import RuntimeOptions

config = Config(
  # To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html
  # If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html
  # This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
  access_key_id=os.environ.get('ALIBABA_CLOUD_ACCESS_KEY_ID'),
  access_key_secret=os.environ.get('ALIBABA_CLOUD_ACCESS_KEY_SECRET'),
  # The service endpoint.
  endpoint='ocr.cn-shanghai.aliyuncs.com',
  # The region ID that corresponds to the endpoint.
  region_id='cn-shanghai'
)
# Scenario 1: Use an image from a local file.
#img = open(r'/tmp/cpsb1.jpg', 'rb')
# Scenario 2: Use an image from a public URL.
url = 'http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg'
img = io.BytesIO(urlopen(url).read())
recognize_license_plate_request = RecognizeLicensePlateAdvanceRequest(
    image_urlobject=img
)
runtime = RuntimeOptions()
try:
  # Initialize the client.
  client = Client(config)
  response = client.recognize_license_plate_advance(recognize_license_plate_request, runtime)
  # Print the full response.
  print(response.body)
except Exception as error:
  # Print the full error message.
  print(error)
  # Print the error code.
  print(error.code)
<?php

// Install the dependency package.
// composer require alibabacloud/ocr-20191230

use AlibabaCloud\SDK\Ocr\V20191230\Ocr;
use \Exception;
use AlibabaCloud\Tea\Utils\Utils;
use Darabonba\OpenApi\Models\Config;
use AlibabaCloud\SDK\Ocr\V20191230\Models\RecognizeLicensePlateAdvanceRequest;
use AlibabaCloud\Tea\Utils\Utils\RuntimeOptions;
use GuzzleHttp\Psr7\Stream;

class RecognizeLicensePlateAdvance {

    /**
     * Initialize the client by using the AccessKey pair.
     * @param string $accessKeyId
     * @param string $accessKeySecret
     * @return Ocr Client
     */
    public static function createClient($accessKeyId, $accessKeySecret){
        // Initialize the configuration object Darabonba\OpenApi\Models\Config.
        // This object stores configuration parameters such as your AccessKey ID, AccessKey Secret, and endpoint.
        $config = new Config([
            "accessKeyId" => $accessKeyId,
            "accessKeySecret" => $accessKeySecret
        ]);
        // The service endpoint.
        $config->endpoint = "ocr.cn-shanghai.aliyuncs.com";
        return new Ocr($config);
    }

    /**
     * @param string[] $args
     * @return void
     */
    public static function main($args){
        // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html.
        // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html.
        // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
        $accessKeyId = getenv('ALIBABA_CLOUD_ACCESS_KEY_ID');      
        $accessKeySecret = getenv('ALIBABA_CLOUD_ACCESS_KEY_SECRET');
        $client = self::createClient($accessKeyId, $accessKeySecret);
        // Scenario 1: Use an image from a local file.
        //$file = fopen('/tmp/cpsb1.jpg', 'rb');
        //$stream = new Stream($file);
        // Scenario 2: Use an image from a public URL.
        $file = fopen('http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg', 'rb');
        $stream = new Stream($file);
        $recognizeLicensePlateAdvanceRequest = new RecognizeLicensePlateAdvanceRequest([
            "imageURLObject" => $stream
        ]);
        $runtime = new RuntimeOptions([]);
        try {
            $resp = $client->recognizeLicensePlateAdvance($recognizeLicensePlateAdvanceRequest, $runtime);
            // Print the full response.
            echo Utils::toJSONString($resp->body);
        } catch (Exception $exception) {
            // Print the full error message.
            echo Utils::toJSONString($exception);
            // Print the error code.
            echo $exception->getCode();
        }
    }
}
$path = __DIR__ . \DIRECTORY_SEPARATOR . '..' . \DIRECTORY_SEPARATOR . 'vendor' . \DIRECTORY_SEPARATOR . 'autoload.php';
if (file_exists($path)) {
    require_once $path;
}
// $argv is a reserved array for input parameters and does not need to be modified.
RecognizeLicensePlateAdvance::main(array_slice($argv, 1));
// Install the dependency package.
// npm install @alicloud/ocr20191230
const OcrClient = require('@alicloud/ocr20191230');
const OpenapiClient = require('@alicloud/openapi-client');
const TeaUtil = require('@alicloud/tea-util');
const fs = require('fs');
const http = require('http');
const https = require('https');

let config = new OpenapiClient.Config({
  // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html.
  // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html.
  // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
  accessKeyId: process.env.ALIBABA_CLOUD_ACCESS_KEY_ID,   
  accessKeySecret: process.env.ALIBABA_CLOUD_ACCESS_KEY_SECRET
});
// The service endpoint.
config.endpoint = `ocr.cn-shanghai.aliyuncs.com`;
const client = new OcrClient.default(config);
const getResponse = function (httpClient, url) {
  return new Promise((resolve, reject) => {
    httpClient.get(url, function (response) {
      resolve(response);
    })
  })
}
const request = async function () {
  try {
    const client = new OcrClient.default(config);
    let recognizeLicensePlateAdvanceRequest = new OcrClient.RecognizeLicensePlateAdvanceRequest();
    // Scenario 1: Use an image from a local file.
    // const fileStream = fs.createReadStream('/tmp/cpsb1.jpg');
    // recognizeLicensePlateAdvanceRequest.imageURLObject = fileStream;
    // Scenario 2: Use an image from a public URL.
    const url = new URL("http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg");
    const httpClient = (url.protocol == "https:") ? https : http;
    recognizeLicensePlateAdvanceRequest.imageURLObject = await getResponse(httpClient, url);
    let runtime = new TeaUtil.RuntimeOptions({ });
    client.recognizeLicensePlateAdvance(recognizeLicensePlateAdvanceRequest, runtime)
      .then(function(recognizeLicensePlateResponse) {
        // Print the full response.
        console.log(recognizeLicensePlateResponse);
        // Print a single field from the response.
        console.log(recognizeLicensePlateResponse.body.data);
      }, function(error) {
        // Print the full error message.
        console.log(error);
        // Print the error code.
        console.log(error.data.Code);
      })
  } catch (error) {
    console.log(error);
  }
}();
/**
This example depends on github.com/alibabacloud-go/ocr-20191230/v3.
We recommend that you use 'go mod tidy' to install the dependency.
*/
package main

import (
	"fmt"
	openapi "github.com/alibabacloud-go/darabonba-openapi/v2/client"
	ocr20191230  "github.com/alibabacloud-go/ocr-20191230/v3/client"
	util "github.com/alibabacloud-go/tea-utils/v2/service"
	"github.com/alibabacloud-go/tea/tea"
	"net/http"
)

func main() {  
  // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html.
  // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html.
  // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
  accessKeyId := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_ID")  
  accessKeySecret := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET")
  // Initialize the configuration object &openapi.Config. This object stores configuration parameters such as your AccessKey ID, AccessKey Secret, and endpoint.
  config := &openapi.Config{
    AccessKeyId: tea.String(accessKeyId),
    AccessKeySecret: tea.String(accessKeySecret)
	}
	// The service endpoint.
	config.Endpoint = tea.String("ocr.cn-shanghai.aliyuncs.com")
	client, err := ocr20191230.NewClient(config)
	if err != nil {
		fmt.Println(err.Error())
	}

	// Scenario 1: Use an image from a local file.
	//file, err := os.Open("/tmp/RecognizeLicensePlate1.jpg")
	//if err != nil {
	//	fmt.Println("can not open file", err)
	//}
	//recognizeLicensePlateAdvanceRequest := &ocr20191230.RecognizeLicensePlateAdvanceRequest{
	//	ImageURLObject: file,
	//}
	// Scenario 2: Use an image from a public URL.
	httpClient := http.Client{}
	file1, _ := httpClient.Get("http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg")
	recognizeLicensePlateAdvanceRequest := &ocr20191230.RecognizeLicensePlateAdvanceRequest{
		ImageURLObject: file1.Body,
	}
	runtime := &util.RuntimeOptions{}
	recognizeLicensePlateResponse, _err := client.recognizeLicensePlateAdvance(recognizeLicensePlateAdvanceRequest, runtime)
	if _err != nil {
		fmt.Println(_err.Error())
	} else {
		// Print the full response.
		fmt.Println(recognizeLicensePlateResponse)
		// Print a single field from the response.
		fmt.Println(recognizeLicensePlateResponse.Body.Data)
	}
}
// Install the dependency package.
// dotnet add package AlibabaCloud.SDK.Ocr20191230
using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Net;
using System.Threading.Tasks;
using AlibabaCloud.SDK.Ocr20191230.Models;
using Tea;
using Tea.Utils;

namespace AlibabaCloud.SDK.Sample
{
    public class Sample
    {
        /**
            * Initialize the client by using the AccessKey pair.
            * @param accessKeyId
            * @param accessKeySecret
            * @return Client
            * @throws Exception
        */
        public static AlibabaCloud.SDK.Ocr20191230.Client CreateClient(string accessKeyId, string accessKeySecret)
        {
            AlibabaCloud.OpenApiClient.Models.Config config = new AlibabaCloud.OpenApiClient.Models.Config
            {
                AccessKeyId = accessKeyId,
                AccessKeySecret = accessKeySecret,
            };
            // The service endpoint.
            config.Endpoint = "ocr.cn-shanghai.aliyuncs.com";
            return new AlibabaCloud.SDK.Ocr20191230.Client(config);
        }
        public static void Main(string[] args)
        {
            // To create an AccessKey ID and AccessKey Secret, see https://help.aliyun.com/document_detail/175144.html
            // If you use a RAM user's AccessKey, grant the RAM user the `AliyunVIAPIFullAccess` permission. For more information, see https://help.aliyun.com/document_detail/145025.html
            // This code reads the AccessKey ID and AccessKey Secret from your environment variables. Ensure they are configured before you run the sample.
            AlibabaCloud.SDK.Ocr20191230.Client client = CreateClient(System.Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_ID"), System.Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_SECRET"));
            AlibabaCloud.SDK.Ocr20191230.Models.RecognizeLicensePlateAdvanceRequest recognizeLicensePlateAdvanceRequest = new AlibabaCloud.SDK.Ocr20191230.Models.RecognizeLicensePlateAdvanceRequest
            ();
            // Scenario 1: Use an image from a local file.
            // System.IO.StreamReader file = new System.IO.StreamReader(@"/tmp/cpsb1.jpg");
            // recognizeLicensePlateAdvanceRequest.ImageURLObject = file.BaseStream;
            // Scenario 2: Use an image from a public URL.
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeLicensePlate/cpsb1.jpg");
            WebResponse response = request.GetResponse();
            Stream stream = response.GetResponseStream();
            recognizeLicensePlateAdvanceRequest.ImageURLObject = stream;
            AlibabaCloud.TeaUtil.Models.RuntimeOptions runtime = new AlibabaCloud.TeaUtil.Models.RuntimeOptions();
            try
            {
                AlibabaCloud.SDK.Ocr20191230.Models.RecognizeLicensePlateResponse recognizeLicensePlateResponse = client.RecognizeLicensePlateAdvance(recognizeLicensePlateAdvanceRequest, runtime);
                // Print the full response.
                Console.WriteLine(AlibabaCloud.TeaUtil.Common.ToJSONString(recognizeLicensePlateResponse.Body));
                // Print a single field from the response.
                Console.WriteLine(AlibabaCloud.TeaUtil.Common.ToJSONString(recognizeLicensePlateResponse.Body.Data));
            }
            catch (TeaException error)
            {
                // Print the error.
                AlibabaCloud.TeaUtil.Common.AssertAsString(error.Message);
            }
            catch (Exception _error)
            {
                TeaException error = new TeaException(new Dictionary<string, object>
                {
                    { "message", _error.Message }
                });
                // Print the error.
                Console.WriteLine(error.Message);
            }
        }
    }
}