Using PHP to write an example tutorial for docking Baidu OCR license plate recognition API
1. Background introduction
With the continuous development of artificial intelligence technology, license plates Recognition technology has been widely used in traffic management, parking lot management and other fields. Baidu OCR License Plate Recognition API provides a simple and fast way to realize license plate recognition. This article will introduce how to use the PHP programming language to connect to Baidu OCR License Plate Recognition API and give corresponding code examples.
2. Preparation work
Before we start, we need to complete the following preparation work:
php -v
on the command line. 3. Writing code
The following is a sample code using PHP to write the docking Baidu OCR license plate recognition API:
<?php define('API_KEY', 'your_api_key'); define('SECRET_KEY', 'your_secret_key'); function getAccessToken() { $url = 'https://aip.baidubce.com/oauth/2.0/token'; $postData = [ 'grant_type' => 'client_credentials', 'client_id' => API_KEY, 'client_secret' => SECRET_KEY, ]; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, $postData); $response = curl_exec($ch); curl_close($ch); $jsonObj = json_decode($response); return $jsonObj->access_token; } function plateRecognition($imagePath) { $url = 'https://aip.baidubce.com/rest/2.0/ocr/v1/license_plate'; $accessToken = getAccessToken(); $postData = [ 'image' => base64_encode(file_get_contents($imagePath)), ]; $headers = [ 'Content-Type: application/x-www-form-urlencoded', 'Access-Token: ' . $accessToken, ]; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postData)); curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); $response = curl_exec($ch); curl_close($ch); $jsonObj = json_decode($response); return $jsonObj->words_result->number; } $imagePath = 'path_to_your_image.jpg'; $plateNumber = plateRecognition($imagePath); echo '车牌号码:' . $plateNumber;
In the above code, you need to put # Replace ##your_api_key and
your_secret_key with your own API Key and Secret Key, and replace
path_to_your_image.jpg with the path of the image you want to identify. After the code is run, the recognized license plate number will be output.
.
php plate_recognition.php
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