[PHP] tesseract_ocrで画像認識させる方法

Composerでtesseract_ocrをインストール

composer require thiagoalessio/tesseract_ocr

aptでtesseract-ocrをインストール＋バージョン確認

sudo apt update
sudo apt install tesseract-ocr
tesseract --version

日本語モジュールをインストール

wget https://github.com/tesseract-ocr/tessdata/raw/main/jpn.traineddata
sudo mv jpn.traineddata /usr/share/tesseract-ocr/4.00/tessdata/

PHPでコード実装、この例では画像URLを指定して画像認識させている

<?php

require 'vendor/autoload.php';

use thiagoalessio\TesseractOCR\TesseractOCR;

// Replace with the path to your Tesseract executable
$tesseractExecutable = '/usr/bin/tesseract';

// Replace with the URL of the image you want to process
$imageUrl = 'https://example.com/path/to/your/image.png';

try {
    // Set the TESSDATA_PREFIX environment variable
    putenv('TESSDATA_PREFIX=/usr/share/tesseract-ocr/4.00/tessdata');

    // Download the image from the URL
    $imageContents = file_get_contents($imageUrl);

    // Create a temporary file to store the downloaded image
    $tempImagePath = tempnam(sys_get_temp_dir(), 'image_');
    file_put_contents($tempImagePath, $imageContents);

    // Create an instance of TesseractOCR and specify the language
    $tesseract = new TesseractOCR($tempImagePath);

    // Set the Tesseract executable path
    $tesseract->executable($tesseractExecutable);

    // Specify the language (Japanese in this example)
    $tesseract->lang('jpn');

    // Run OCR on the image
    $text = $tesseract->run();

    // Output the detected text
    echo "Detected Text:\n";
    echo $text;

    // Clean up by deleting the temporary image file
    unlink($tempImagePath);
} catch (Exception $e) {
    echo 'Error: ' . $e->getMessage();
}